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Home My WebLink About4050 GOSFORD ROAD (11)DELTA "= a.rb,4: XInogen' En,uonmenulAlliance SUSTAINABLE STRATEGIES FOR GLOBAL LEADERS April 14, 2008 Project No. SCA4050G1 SAP 121224 Mr. Howard Wines III Environmental Services City of Bakersfield Fire Department 1715 Chester Avenue, 3rd Floor Bakersfield, California 93706 -2020 Re: FIRST QUARTER 2008 STATUS UPDATE REPORT Texaco Service Station 4050 Gosford Road Bakersfield, California Dear Mr. Wines: On behalf of Equilon Enterprises LLC dba Shell Oil Products (SHELL), Delta Consultants (DELTA) has prepared this First Quarter 2008 Status Update Report for the above referenced site. This quarterly report represents DELTA's professional opinions based upon the currently available information and are arrived at in accordance with currently acceptable professional standards. This report is based upon a specific scope of work requested by the client. The Contract between DELTA and its client outlines the scope of work, and only those tasks specifically authorized by that contract or outlined in this report were performed. This report is intended only for the use of DELTA's Client and anyone else specifically listed on this report. DELTA will not and cannot be liable for unauthorized reliance by any other third party. Other than as contained in this paragraph, DELTA makes no express or implied warranty as to the contents of this report. If you have any questions regarding this site, please contact Mr. Ross Inouye DELTA Project Mamager) at (626) 256 -6662 or Mr. Randy Orlowski SHELL) at (949) 360 -1111. Sincerely, Delta Consultants k`-Mark Yiatras Project Geologist Scott N. Pearson, PG 6931 Unit Manager Attachment: First Quarter 2008 Status Update Report cc: Mr. Randy Orlowski, Shell Oil Products US iN Q N0. 6931 EXP.0513tN8 FCAt -%! 911 SOUTH PRIMROSE AVENUE SUITE K MONROVIA, CALIFORNIA 91016 USA PHONE 626.256.6662 / 800.477.7411 FAx 626.256.6263 WWW.DELTAENV.COM SHELL QUARTERLY STATUS UPDATE REPORT Station Address: 4050 Gosford Road, .Bakersfield, California DELTA Project No.: SCA4050G1 SHELL Environmental Engin. / Phone No.: Randy Orlowski / (949) 360-1111 DELTA Site Manager / Phone No.: Ross Inouye / (626) 256 -6662 Primary Agency/Regulatory ID No.: City of Bakersfield / Howard Wines III Other Agencies to Receive Copies: None WORK PERFORMED THIS QUARTER (FIRST - 2008): 1. Submitted Fourth Quarter 2007 Status Update Report. 2. Continued quarterly soil vapor sampling for Monitoring and Natural Attenuation. WORK PROPOSED FOR NEXT QUARTER (SECOND - 2008): 1. Submit Status Update Report. 2. Perform quarterly soil vapor sampling for Monitoring and Natural Attenuation. Current Phase of Project: Frequency of Sampling: Frequency of Monitoring: Is Separate Phase Hydrocarbon Present On -site (Well #'s): Cumulative SPH Recovered to Date: Remediation (Monitoring and Natural Attenuation) NA Quarterly (soil vapor) Yes ® No NA SPH Recovered This Quarter: None Sensitive Receptor(s) and Respective Direction(s): General Site Lithology: Current Rernediation Techniques: Permits for Discharge: Approximate Depth to Groundwater: Groundwater Gradient: Current Agency Correspondence: April 14, 2008 The Arvin Edison Canal is located approximately 790 feet east of the site location. Buena Vista Lake Bed is located approximately 1020 feet northeast of the site. The nearest municipal well (CBK 15 -01) is located approximately 3,909 feet southwest of the site. Soils encountered on site consists primarily of fine- grained sand- to approximately 65 feet below ground surface (bgs). A sandy to silty clay layer was encountered above approximately 12 feet bgs. Monitoring and Natural Attenuation Soil Vapor Extraction wells are currently installed on -site. None NA NA October 8, 2004 SHELL QUARTERLY STATUS REPORT (CONT.) Site History: Case Opening Onsite Assessment Offsite Assessment Passive Remediation Active Remediation Closure Summary of Unusual Activity: 2000 2001, 2003 NA 2004 NA NA None April 14, 2008 ATTACHED: Table 1 — Soil Vapor Sampling Analytical Data (Hydrocarbons and Fuel Oxygenates) Table 2 — Soil Vapor Sampling Analytical Data (Fixed Gases) Figure 1 — Site Location Map Figure 2 — Site Map Figure 3 — Soil Vapor Analytical Results Map Appendix A — Soil Vapor Sampling Laboratory Report and Chain -of- Custody Documentation b7 r rl TABLES M Imm mmm mm mm m m m m m TABLE I SOIL VAPOR SAMPLING ANALYTICAL DATA (HYDROCARBONS AND FUEL OXYGENATES) Shell Service Station 4050 Gosford Road, Bakersfield, CA I N"', I ........ , VEW-1A c IN 71W 4 - '2 1* IT W 4/14/2005 ND<3.0 ND ND<0.0005 0.0022 0.002 0.0146 1.1 4.0 ND<0.002 ND<0.002 ND<0.002 ND<0.002 5/18t2005 ND<3.0 ND 0.00071 0.0017 0.00094 0.0038 2.0 7.1 ND10.002 ND<0.002 ND<0.002 ND<0.002 6/2012005 ND<3.0 ND 0.00054 0.0011 ND<0.0005 0.00292 1.2 ND<0.002 ND<0.002 ND<0.002 ND<0.002 7/14/2005 ND<3.0 ND 0.00074 0.0018 ND<0.0005 0.00186 1.2 4.5 4.4 ND<0.002 ND<0M2 ND<0.002 ND<0.002 8/9/2005 ND<3.0 ND ND<0.002 0.0054 ND<0.002 ND<0.004 0.7 2.5 ND<0,008 ND<0.008 ND,<0.008 ND<0.008 9128/2005 3.2 13 0.004 0.026 0.015 0.129 0.93 3.3 ND<0.004 ND<0M4 ND<0.004 10/1312005 ND<3.0 ND ND<0.0005 0.0021 ND<0M05 ND<0.0005 0.51 1.5 ND<0.002 ND<0.002 ND<0.002 N[)<0.004 ND<0.002 2/1/2006 ND<3.0 ND NEX0.00050 0.00094 ND<000050 ND<0.0010 0.100 0.37 ND<0.002 ND<0.002 ND<0.002 N01<0.002 5/16/2006 ND<3.0 ND ND<0.00050 0.00230 0.00068 0.00120 0.013 0.05 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/16/2006 ND<3.0 ND ND<0.00050 0.0017 0.00088 0.0028 0.007 00.26 ND<0.002 ND<0.002 ND<0.002 ND<0.002 12/27/2006 ND<3.0 ND ND<0.00050 0.0079 0.00160 0.0052 0.0037 0.013 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/1012007 53 21 0.0023 0.0049 0.0009 0.006 0.0034 0.012 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6/19/2007 ND<3.0 ND ND<0.00050 0.0019 0.00087 0.0073 0.0025 ND<0.002 ND<0.002 ND<0.002 ND<0.002 9/2112007 ND<3.0 ND 0.011 0.086 0.02 0.121 0.0062 0.022 ND<0.002 ND<0.002 ND<0.002 ND<0.002 12/3/2007 ND<3.0 ND ND<0.00050 0.003 0.00072 0.00316 0.0024. 0.0087 ND<0M2 ND<0.002 ND<0.002 ND<0.002 3/52008 ND<3.0 ND ND<0.00050 0.0020 ND<0.00050 0.0010 0.0039 0.014 NE><0.0020 ND<0.0020 ND<0.0020 ND<0.0020 I VEW-1B 0.0035 0.0028 0.0181 1.2 4.2 ND<0.002 Awkl--dw. ND<0.002 W-MP- ND<0.002 ND<0.0024/142005 ND<3.0 ND ND<0.0005 5/182005 ND<3.0 ND ND<0.0005 0.0019 0.00089 0.00329 0.0023 0.0093 ND<0.002 ND<0.002 ND<0.002 ND<0.002 620/2005 ND<3.0 ND ND<0.0005 0.001 ND<0.0005 0.00275 0.14 0.52 ND<0.002 ND<0.002 Nt><0.002 7/1412005 ND<3.0 ND 0.00058 0.0011 ND<0.0005 ND<0.001 0.0053 0.019 ND<0.002 ND<0.002 ND<0.002 N[)<0.002 ND<0.002 8192005 ND<3.0 ND ND<0.002 0.0034 ND<0.002 ND<0M4 0.17 0.60 ND<0.008 ND<0.008 ND<0.008 ND<0.008 9/2812005 ND<3.0 ND 0.0019 0.011 0.0049 0.042 0.160 0.59 ND<0.004 ND<0.004 ND<0.004 10/132005 ND<3.0 ND ND<0.0005 0.0024 ND<0.0005 ND<0.001 0.008 0.027 ND<0.002 ND<0.002 ND<0.002 Nb<-0.004 ND<0.002 2/1/2006 ND<3.0 ND 0.00067 0.0024 ND<0.0005 ND<0.001 ND<0.002 ND<0.0072 ND<0.002 ND<0.002 ND<0M2 ND<0.002 5/162006 ND<3.0 ND 0.00084 0.0025 0.00056 0.0025 0.0063 0.023 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/1612006 ND<3.0 ND ND<0.0005 0.0024 0.0021 0.0068 0.0066 0.024 ND<0.002 ND<0M2 ND<0.002 ND<0.002 12127/2006 ND<3.0 ND ND<0.00050 0.0071 0.0014 0.0047 0.0043 0.015 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/10/2007 9.1 37 0.0025 0.0063 0.0022 0.0073 0.0023 0.0083 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6/19/2007 ND<3.0 ND ND<0.00050 0.0031 0.0016 0.0127 0.0036 ND<0.002 ND<0.002 Nl><0.002 9/21/2007 ND<3.0 ND 0.019 0.691 0.028 0.12 0.0061 0.022 ND<0.002 ND<0.002 ND<0.002 ND<0.002 ND<0.002 12/312007 ND<3.0 ND 0.00067 0.0045 0.0015 0.0067 0.003 0.011 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/512008 ND<3.0 ND NEX0.00050 0.0025 ND<0.00050 ND<0.001 5 0.0031 0.011 ND<0M20 ND<0.0020 ND<0.0020 ND<0.0020 VEW-2A 411412005 18 74 ND<0.002 0.0028 0.0029 0.0197 9.7 35 ND<0.008 ND<0.008 ND<0.008 ND<0.008 5/1812005 20 82 0.0036 0.002 0.0011 0.00309 20 73 ND<0.002 ND<0.002 0.002 0.0022 6/2012005 150 615 ND<0.005 ND<0.005 ND<0.005 ND<0.005 8.8 32 ND<0.02 ND<0,02 ND<0.02 7/142005 25 102 0.00078 0.0023 ND<0.0005 0.0027 16.0 57 0.012 ND<0.002 0.0065 ND<0.02 ND<0.002 8/9/2005 240 984 ND<0.033 ND<0.033, ND<0.033 ND<0.065 4.0 15 ND<O. 13 ND<0,13 ND<0.13 ND<0.13 9/282005 33 14 0.0017 0.010 0.0048 0.040 0.830 3 ND<0.004 ND<0.004 ND<0.004 ND<0.004 10/132005 53 22 ND<0.001 ND<0.001 ND<0.001 ND<0.002 2.400 8.6 ND<0.04 ND<0.04 ND<0.04 ND<0.04 2/112006 ND<3.0 ND ND<0,00050 0.0011 ND<0.00050 ND<0.0010 0.820 3.0 ND<0.002 ND<0.002 ND<0.002 ND<0.002 5/16/2006 ND<3.0 ND ND<0.00050 0.0018 0.00056 0.0025 0.720 2.6 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/1612006 ND<3.0 ND ND<0,00050 0.0015 0.00089 0.0029 0.190 0.65 ND<0.002 ND<0.002 ND<0.002 ND<0.002 12/2712006 ND<3.0 ND ND<0.00050 0.0087 0.0014 0.0047 0.0031 0.11 ND<0M2 ND<0.002 ND<0.002 ND<0.002 3/1012007 ND<3.0 ND 0.0015 0.0033 0.00098 0.0028 0.031 0.11_ ND<0.002 ND<0M2 ND<0.002 ND<0.002 61192007 ND<3.0 ND ND<0.00050 0014 0005 0073 0059 ND<0.002 ND<0.002 ND<0.002 ND<0.002 9/21/2007 ND<3.0 ND 0.0076 054 014 119 028 0.10 ND<0.002 ND<0.002 ND<0.002 12/32007 ND<3.0 ND 0.0011 0.0064 0.0012 0.0043 0.0084 0.030 ND<0.002 ND<0.002 ND<0.002 ND<0,002 ND<0.002 3/52008 ND<3.0 ND ND<000050 0.0025 ND<0.00050 ND<0.0015 0.0075 0.027 ND<0,0020 ND<0.0020 ND<0.0020 1iD<0.0020 Page 1 of 4 TABLE I SOIL VAPOR SAMPLING ANALYTICAL DATA (HYDROCARBONS AND FUEL OXYGENATES) Shell Service Station 4050 Gosford Road, Bakersfield, CA X ppm) V W-2B 11W11 I I k';111qwrr'-1m war--, V 4W7 4/14/2005 4.9 20 ND<0,0005 0.0011 0.00074 0.0052 3.5 13 ND<0.002 0.0028 ND<0.002 5/18/2005 N-D-<30 ND ND<0,0005 0.0011 0.00075 0.00259 0.011 0.041 ND<0.002 ND<0.002 ND<0.002 ND<0.002 61252-0-05 5.7 23 0.00057 0.0011 ND<0.0005 0.0032 7.9 29 0.0067 ND<0.002 0.003 ND<0.002 7/1412005 ND<3.0 ND 0.00098 0.0017 NDK0.0005 0.0024 0.0085 0.031 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8t92005 5.5 23 0.0028 ND<0.002 ND<0.004 4.6 17 0.023 ND<0.008 ND<0.008 ND<0.008 9/2812005 73 30 ND<0.002 ND<0.2 ND<0.4 ND<0.2 ND<0.2 11 39 ND<0.8 ND<0.8 ND<0.8 ND<0.8 10/13/2005 ND<3.0 ND ND<0.005 0.0016 ND<0.005 ND<0.001 5.2 19 ND<0.002 ND<0.002 ND<0.002 ND<0.002 2/1/2006 ND<3.0 ND ND<0.00050 0.00093 ND,<0.00050 N-D<0 00-1 ND<0.002 ND<0.0072 ND<0.002 ND<0.002 ND<0.002 ND<0.002 5/162006 ND<3.0 ND NIX0.00050 0.00015 ND<0,00050 0,00014 0.100 038 ND<0M2 ND<0.002 ND<0.002 ND<0.002 8/16/2006 ND<3.0 ND ND<0.00050 0.0013 0.00055 0.0018 0.089 032 ND<0.002 ND<0.002 ND<0.002 ND<0.002 122712006 ND<3.0 ND ND<0M050 0.0079 0.0014 0.0047 0.0032 0.012 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/102007 3.4 14 0.0036 0.0059 0.0022 0.0068 ND<0.002 ND<0.0072 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6/192007 ND<3.0 ND ND<0M050 0.0012 ND<0.00050 0.0021 0.0023 NA ND<0.002 ND<0.002 ND<0.002 ND<0.002 9212007 ND<3.0 ND 0.00077 0.0069 0.0012 0.0081 ND<0.002 ND<0.0072 ND<0.002 ND<0.002 ND<0.002 12/312007 ND<3.0 ND 0.0022 0.0110 0.0019 0.0070 0.041 0.15 ND<0.002 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/52008 ND<3.0 ND ND<0.00050 0.0024 ND<0.00050 0.0010 R-D<0.002 ND<0.0072 ND<0.0020 ND<0.0020 ND<0.0020 ND<0.0020 VEW-3A 0- sonkmiW smw' mfrn'' -m am-m-my"2 K09%drim myftrm 4/1412005 150 615 ND<0.02 ND<0.02 ND<0.02 ND<0.02 99 360 0.59 ND<0.08 ND<0.08 ND<0.08 51182005 75 307 0.00082 0.0027 0.0017 0.0058 76 280 ND<0.002 ND<0.002 0.012 0.011 6/202005 1,600 6,557 0.059 ND<0.01 ND<0.01 ND<0.01 53 190 0.23 ND<0.04 ND<0.04 ND<0.04 7/14/2005 570 2,336 ND<0.005 ND<0.005 ND<0.005 ND<0.01 31 110 ND<0.02 ND<0.02 ND<0.02 ND<0.02 8/9/2005 2,200 9,016 ND<0,31 ND<0.31 ND<0.31 ND<0.63 52 190 ND<1,3 ND<1,3 ND<1.3 ND<1.3 912812005 100 410 ND<0.005 0.0062 ND<0.005 0.0285 32.0 110 0.087 ND<0.02 ND<0.02 ND<0.02 10/1312005 55 225 ND<0M75 0.019 ND<0.0075 ND<0.015 34.0 120 0.054 ND<0.015 ND<0.015 ND<0.015 2/12006 8.4 34 ND<0.0010 0.0013 ND<0.0010 ND<0.0020 7.7 28 ND<0.004 ND<0.004 ND<0.004 ND<0.004 5/1612006 73 30 ND<0.0010 0.0013 ND<0.0010 ND<0.0020 7.7 28 ND<0.004 ND<0.004 ND<0.004 ND<0.004 8/16/2006 3.8 16 ND<0M10 0.0022 0.0013 0.0045 1.5 5.6 ND<0.004 ND<0.004 ND<0.004 ND<0.004 12272006 ND<3.0 ND ND<0.00050 0.0074 0.0032 0.011 1.2 43 ND<6.002 ND<0.002 ND<0.002 ND<0.002 3110/2007 ND<3.0 ND 0.002 0.0024 ND<0,0020 ND<0.0020 0.29 1.0 ND<0.008 ND<0.008 ND<0.008 NL)<0.008 6/19/2007 ND<3.0 ND 0.002 0.0023 0.0016 0.0058 042 NA ND<0.002 ND<0.002 ND<0.002 ND<0.002 9212007 ND<3.0 ND 0.01 0.056 0.016 0.132 ND<0.002 ND<0.0072 ND<0.002 ND<0.002 ND<0.002 12/32007 ND<3.0 ND 0.00056 0.004 0.0011 0.0054 0-.-0-053 0.019 ND<0.002 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/5/2008 ND<3.0 ND ND<0.00050 0.0012 ND<0.00050 ND<0.0015 0.0039 0.014 ND<0.0020 ND<0.0020 ND<0.0020 ND<0.0020 I VEW-3B A;AL ND<0,004 ND<0.004 Z' A ND<0.004 z 31 IiAk; 110 L,, M',AW, ND<0.016 ND<0.016 ND<0.016 NIX0.0164/14/2005 30 323 0.011 5/182005 9.4 39 0.00085 0.0017 0.0015 0.0052 11 38 ND<0.002 ND<0.002 ND<0.002 ND<0.002 612012005 18 74 0.001 0.0021 0.0014 0.011 12 44 ND<0.002 ND<0.002 0.003 ND<0.002 7/1412005 17 70 0.001 0.0013 ND<0.0005 0.0016 19 68 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/9/2005 10 41 ND<0.002 0.003 ND<0.002 ND<0.004 8.6 31 ND<0.008 ND<0.008 ND<0.008 ND<0.008 9/282005 73 30 ND<0.02 ND<0.02 ND<0.02 ND<0,04 8.9 32 ND<0.08 ND<0.08 ND<0.08 ND<0.08 10113/2005 9.2 38 ND<0.001 0.0031 ND<0.001 ND<0.002 10.0 36 ND<0.004 ND<0.004 ND<0.004 ND<0.004 2/112006 6.4 26 ND<0.0010 0.0014 ND<0 0010 ND<0.0020 63 23 ND<0.004 ND<0.004 ND<0.004 ND<0M4 5/162006 12 49 ND<0.0010 0.0022 NE><0.0010 0.0022 9.2 33 ND<0.004 ND<0.004 ND<0.004 ND<0.004 8/162006 83 34 NEX0.0010 0.0019 0.0011 0.0037 8 29 ND<0.004 ND<0.004 ND<0.004 ND<0.004 1227/2006 9.4 39 ND<0.0010 0.0067 0.0031 0.011 12 42 ND<0.004 ND<0.004 ND<0.004 ND<0.004 3/102007 6.5 27 ND<0M2 ND<0.002 ND<0.002 ND<0.002 6.2 23 ND<0.080 ND<0.080 ND<0.080 ND<0.080 6/19/2007 ND<3.0 NA WX0.00050 0.0011 ND<0.00050 0.0019 63 NA ND<0.002 ND<0.002 ND<0.002 ND<0.002 9/21/2007 5.7 23 0.0061 0.057 0.0092 0.088 5.9 21 ND<0.02 ND<0.02 ND<0.02 ND<0.02 12/3/2007 33 14 ND<0.020 ND<0.020 ND<0.020 ND<0.040 3.7 13 ND<0.080 D<0.080 ND<0.080 ND<0.080 3/5/2008 4.8 20 ND<0.00050 0.0019 ND<0,00050 ND<0.0015 0.26 0.94 ND<0.0020 ND<0.0020 ND<0.0020 ND<0.0020 m m Page 2 of 4 TABLE I SOIL VAPOR SAMPLING ANALYTICAL DATA (HYDROCARBONS AND FUEL OXYGENATES) Shell Service Station 4050 Gosford Road, Bakersfield, CA geNZpNt-:- I ................... ppm) 4" VEWAA 7 ND<3.0 ND ND<0.004 ND<0.004 ND<0.004 0.0087 039 1.4 ND<0.016 ND<0.016 ND<0.016 ND<0.016 4/1412005 (2 MIN) ND<3.0 ND Nl><0.005 ND<0.005 ND<0.005 NI <0.005 0.57 2.0 ND<0.016 ND<0.016 ND<0.016 ND<0.016 4/14/2005 (5 MIN) 43 Is ND<0.005 ND<0.005 ND<0.005 ND<0.005 1.50 53 ND<0.02 ND<0.02 ND<0.02 ND<0.02 511812005 ND<3.0 ND 0.00058 0.0016 0.0013 0.0059 0.94 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6/20/2005 85 ND 0.0017 0.0013 0.00069 0.0036 0.15 3.4 0.53 ND<0.002 ND<0.002 ND<0.002 ND<0.002 7/14/2005 33 14 0.0012 0.0016 ND<0.0005 0.003 0.17 0.61 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/9/2005 ND<3.0 ND ND<0.002 0.0027 ND<0.002 ND<0.004 0.041 0.15 ND<0.008 ND<0.008 ND<0.008 ND<0.008 9/28/2005 ND<3.0 ND ND<0.001 0.0074 0.0025 0.0207 0.052 0.19 ND<0.004 ND<0.004 0.018 ND<0.004 10/13/2005 ND<3.0 ND ND<0.002 0.0025 ND<0.002 ND<0.004 0.058 0.21 ND<0.008 ND<0.008 ND<0.008 ND<0.008 2/1/2006 ND<3.0 ND ND<0,00050 0.00093 ND<0.00050 ND-<0.0010 0.090 033 ND<0.002 ND<0.002 ND<0.002 ND<0.002 5M612006 ND<3.0 ND ND<0.00050 0.0018 ND<0.0010 0.0017 0.055 0.20 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8116/2006 ND<3.0 ND ND<0.00050 0.0015 0.00099 0.0032 0.022 0.080 ND<0.002 ND<0.002 ND<0.002 ND<0.002 12/27/2006 ND<3.0 ND ND<0.00050 0.011 0.0059 0.019 0.026 0.092 ND<0.002 ND<0.002 Nl><0.002 ND<0.002 3/10/2007 ND<3.0 ND ND<0.002 0.0024 ND<0.002 ND<0.002 0.012 0.043 ND<0.008 ND<0.008 ND<0.008 6/19/2007 ND<3.0 ND ND<0.00050 0.00076 ND<0.00050 0.00100 ND<0.002 NA ND<0.002 ND<0.002 ND<0.002 ND<0.008 ND<0.002 9/21/2007 ND<3.0 ND 0.0082 0.077 0.014 0.121 ND<0.008 ND<0.029 ND<0.008 ND<0.008 ND<0.008 12/3/2007 ND<3.0 ND ND<0.00050 0.0022 0.00060 0.00275 0.0054 0.019 ND<0.002 ND<0.002 ND<0.002 ND<0.008 ND<0.002 3/5/2008 ND<3.0 ND ND<0.00050 0.0021 ND<0M050 ND<0.0015 0.0022 0.0081 ND<0.0020 ND<0.0020 ND<0.0020 ND<0.0020 VEWAB I e`< 4/14/2005 (1 MIN) ND<3.0 ND ND<0.002 0.0021 0.0025 0.0156 13 4.5 ND<0,008 ND<0.008 ND<0.008 ND<0.008 4/14/2005 (2 MIN) ND<3.0 ND ND<0.004 ND<0.004 ND<0.004 ND<0.004 1.3 4.8 ND<0.016 ND<0.016 ND<0.016 ND<0.016 4/14/2005 (5 MIN) ND<3.0 ND ND<0.004 ND<0.004 ND<0.004 0.0091 1.2 4.4 ND<0,016 ND<0.016 ND<0.016 ND<0.016 5/18/2005 ND<3.0 ND 0.00067 0.0012 0.0013 0.0054 0.0054 0.019 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6120/2005 ND<3.0 ND 0.00067 0.0016 0.00074 0.005 0.13 0.47 ND<0,002 ND<0.002 ND<0.002 ND<0.002 7/14/2005 ND<3.0 ND 0.00092 0.0013 ND<0.0005 0.0018 ND<0.002 ND<0.0072 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/9/2005 ND<3.0 ND ND<0.002 0.0039 ND<0.002 ND<0.004 037 1.4 ND<0M8 ND<0.008 ND<0.008 9/28/2005 ND<3.0 ND ND<0.002 0.0075 0.0036 0.0295 0.25 0.91 ND <0.008 ND<0.008 ND<0,008 ND<0.008 ND<0.008 10/13/2005 ND<3.0 ND ND<0.001 0.0026 ND<0.001 ND<0.002 0.034 0.12 ND<0,008 ND<0.008 ND<0.008 ND<0.008 2/1/2006 ND<3.0 ND ND<0.00050 0.0010 Nl)<0.00050 ND,<0,0010 0.012 0.044 ND<0.002 ND<0.002 ND<0.002 ND<0,002 5/16/2006 ND<3.0 ND ND<0.00050 0.0022 0.00084 0.0027 0.130 0.49 ND<0.0032 ND<0.0032 ND<0.0032 ND<0.0032 8116/2006 ND<3.0 ND ND<0.00050 0.0013 0.00086 0.0027 0.029 0.10 ND<0.0032 ND<0,0032 ND<0.0032 12127/2006 ND<3.0 ND 0.00074 0.012 0.0068 0.022 0.013 0.048 ND<0.002 ND<0.002 ND<0.002 NL)<0.0032 ND<OM2 3/10/2007 ND<3,0 ND ND<0.002 ND<0.002 ND<0.002 Nf)<0.002 ND<0.008 ND<0.029 ND<0.008 ND<0.008 ND<0.008 ND<0M8 6/19/2007 ND<3.0 NA ND<0.00050 0.00110 ND<0.00050 0.00216 0.02300 NA ND<0.002 ND<0.002 ND<0.002 9/2(/2007 ND<3.0 NA 0.024 0.094 0.032 0.158 ND<0.002 ND<0M72 ND<0.002 ND<0.002 ND<0.002 ND<0,002 12/3/2007 4.0 16 ND<0.020 ND<0.020 ND<0.020 ND<0b40 4.7 17 ND<0.080 ND<0.080 ND<0.080 ND<0.002 ND<0,080 3/5/2008 ND<3.0 ND ND<0.00050 0.0014 ND<0.00050 ND<0.0015 ND<0.002 ND<0.0072 ND<0.0020 ND<0.0020 ND<0.0020 ND<0.0020 VEW-SA 4/14/2005 89 365 ND<0.013 0.022 ND<0.013 ND<0.013 46 170 0.062 ND<0.05 ND<0.05 ND<0.05 5/1812005 40 164 0.-0009 0.003 0.0016 0.0056 55 200 0.014 ND<0.002 0.0074 0.0045 6/20/2005 440 1,803 0.013 ND<0M5 ND<0.005 0.0316 430 16 ND<0.02 ND<0.02 ND<0.02 ND<0.02 7/14/2005 92 377 0.0012 0.0017 ND<0.0005 0.0018 1.2 4.4 0.0095 ND<0.002 0.0038 8/9/2005 480 1,967 1Z<0 0-63 NL)<0.063 ND<0.063 ND<O. 13 3.0 11 ND<0.25 ND<0.25 ND<0.25 ND<0.002 ND<0.25 9/28/2005 62 254 ND<0.002 0.0072 0.0047 0.036 1.7 6.1 ND<0.008 ND<0.008 ND<0.008 ND<0.008 10/13/2005 20 82 ND<0.002 0.0022 ND<0.002 ND<0.004 2.2 7.8 ND<0.008 ND<0.008 ND<0.008 2/1/2006 ND<3.0 ND ND<0.00050 0.0011 ND<0.00050 ND<0M10 13 4.8 ND<0.002 ND<0.002 ND<0.002 ND<0.008 ND<0.002 5/1612006 ND<3.0 ND NDI<0,0010 0.0026 ND<0,0010 0.0028 0320 1.2 ND<0.004 ND<0.004 ND<0.004 ND<0.004 8/16/2006 ND<3.0 ND ND<0.00050 0.0019 0.0017 0.0058 0.093 030 NEX0,002 ND<0.002 ND<0.002 ND<0.002 12/27/2006 ND<3.0 ND ND<0.00050 0.0064 0.0029 0.0095 0.021 0.077 ND<0.002 ND<0.002 ND<0.002 3/10/2007 ND<3.0 ND ND<0.002 0.0023 ND<0.002 ND<0.002 0.011 0.038 ND<0.008 ND,<0.008 ND<0.008 ND<0.002 ND<0.008 12/27/2006 ND<3.0 ND ND<0.00050 0.0064 0.0029 0.0095 0.021 0.077 ND<0.002 ND<0.002 ND<0.002 6/19/2007 NS NS NS NS NS NS NS NS NS NS NS ND<0.002 NS 9/21/2007 ND<3.0 ND 0.023 0.19 0.032 0.228 0.017 0.062 ND<0.002 ND<O 002 ND<0.002 ND<0.002 12/3/2007 ND<3.0 ND ND<0.00050 0.0024 0.00070 0.0042 0.0076 0.028 ND<0.002 0 ND<0.002 N1><0.D02 3/5/2008 023 ND<0.00050 ND<0.0015 0.0067 0.024 ND<0.0020 N "00022:OF ND<0.0020 NIX0.0020 Page 3 of 4 TABLE I SOIL VAPOR SAMPLING ANALI-171CAL DATA HYDROCARBONS AND FUEL OXYGENATES) Shell Service Station 4050 Gosford Road, Bakersfield, CA Wrl - 19 TAMP:.::. I .............. I ................. I I V W-5B 17 70 ND<0.004 ND<0.004 P ND<0.004 ND<0.004 31 110 0.032 ND<0,016 ND<0.016 ND<0.0164114/2005 511812005 ND<3.0 ND 0.00062 0.0016 0.0013 0.0045 0.015 0.053 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6/2U2005 23 0.0011 ND<0.0005 00262 15 53 0.02 ND<0.002 ND<0.002 ND<0.002 7/14/2005 ND<3.0 ND 0.00069 0.0015 ND<0,0005 0.001 0.0031 0.011 ND<0.002 ND<0.002 ND<0.002 ND<0.002 8/9/2005 24 98 ND<0.002 0.0025 ND<0.002 ND<0.004 33 120 0.02 ND<0.008 ND<0.008 9/28/2005 24 98 ND<0.001 0.0051 0.0023 0.0185 24 85 0.0046 ND<0.004 0.0041 ND<0.004 10/13/2005 to ND ND<0.001 0.0001 ND<0.001 ND<0.002 13 46 ND<0.002 ND<0.002 ND<0.002 ND<0.002 2/1/2006 ND<3.0 ND ND<0.00050 0.0011 ND<0.00050 ND<0,001 ND<0.002 ND <0.0072 ND<0.002 ND<0.002 ND<0.002 ND<0.002 5/1612006 ND<3.0 ND ND<0.001 0.0020 ND<0,0010 0.0021 0.180 0.64 ND<0.004 ND<0.004 ND<0.004 ND<0.004 8/1612006 ND<3.0 ND ND<0.00050 0.0017 0.0011 0.0035 0.011 0.040 ND<0.004 ND<0.004 ND<0.004 ND<0.004 12/2712006 ND<3.0 ND ND<0.00050 0.0073 0.0023 0.0080 N[)<0.002 ND <0.0072 ND<0.002 ND<0.002 ND<0.002 ND<0.002 3/10/2007 ND<3.0 NO 0.00290 ND<0.002 ND<0.002 ND<0.002 ND<0.002 ND<0.029 ND<0.002 ND<0.002 ND<0.002 ND<0.002 6/1912007 NS NS NS NS NS NS NS NS NS NS NS NS 3/10/2007 ND<3.0 ND 0.00290 ND<0M2 ND<0.002 ND<0.002 ND<0.002 NIX0.029 ND<0.002 ND<0.0102 ND<0.002 9/21/2007 ND<3.0 ND 0.022 0.13 0.037 0.192 0.003 0.011 ND<0.002 ND<0.002 ND<0.002 ND<0.002 ND<0.002 12/312007 ND<3.0 ND 0.0026 0.00091 0.0057 0.0034 0.0089 0.032 ND<0.002 ND<0.002 ND<0.002 ND<0.002 315/2008 ND<3.0 ND ND<0.00050 0.0020 ND<0.00050 ND<0.0015 ND<0.002 ND <0.0072 ND<0.0020 ND<0.0020 ND<0M20 ND<0.()020 Notes: TPH-G Concentration (uvA) = TPH-G concentration (ppmv) x W x 100 g/mole x mole/24.4 I x 106 uujg ND - Not detected NS - Not sampled NA - Not available pprn - parts per million ugfL - micrograms per liter TPH-G - Total petroleum hydrocarbons as gasoline MTBE - Methyl-tert butyl ether T13A - Tert-butyl alcohol DIPE - Di-isopropyl ether ETBE - Ethyl tert-butyl ether TAME - Tert-amyl methyl ether Page 4 of 4 TABLE SOIL VAPOR SAMPLING ANALYTICAL DATA (FIXED CASES) Shell Service Station 4050 Gosford Road, Bakersfield, CA 4 ....... m CO VEW-IA 10.14/14/2005 10.1 79.7 ND ND 5/18/2005 12.6 79.5 ND ND 7.9 6/20/2005 10.1 80.5 ND ND 9.4 7/14/2005 10-3 79.1 ND ND 10.6 8/9/2005 10.0 78.9 ND ND 11.1 9/28/2005 10.9 76.9 ND ND 12.2 10/13/2005 12.3 79.0 ND ND 8.8 2/l/2006 12.8 79.6 ND ND 7.6 5/16/2006 14.1 79.8 ND ND 6.11 8/16/2006 14.1 79.4 ND ND 6.50 12/27/2006 15.1 79.4 ND ND 5.45 3/8/2007 18.3 78.8 ND ND 2.88 6/19/2007 15.8 79.0 ND ND 5.21 9/21/2007 16.0 78.2 ND ND 5.80 12/3/2007 16.5 77.8 ND ND 5.67 3/5/2008 17.4 78.2 ND ND 4.39 VEW-IB W u un 4/14/2005 10.4 79.8 ND ND 9.8 5/18/2005 12.6 79.7 ND ND 7.7 6/20/2005 10.2 80.4 ND ND 9.4 7/14/2005 10.8 79.3 ND ND 9.9 8/9/2005 10-3 78.8 ND ND 10.9 9/28/2005 11.2 77.0 ND ND 11.8 10/13/2005 11.0 79.6 ND ND 9.4 2/l/2006 12.9 79.9 ND ND 7.2 5/16/2006 14.2 79.9 ND ND 5.85 8/16/2006 13.7 79.6 ND ND 6.72 12/27/2006 15.0 79.6 ND ND 5.41 3/8/2007 18.2 78.9 ND ND 2.87 6/19/2007 15.9 79.2 ND ND 4.96 9/21/2007 15.8 78.5 ND ND 5.65 12/3/2007 15.8 77.9 ND ND 6.34 3/5/2008 16.5 78.4 ND ND 5.09 Page 1 of 5 m SOIL VAPOR SAMPLING ANAL i'TICAL DATA (FIXEDGASES) Shell Service Station 4050 Gosford Road, Bakersfield, CA 10/13/2005 9.9 79.5 ND ND 10.6 5/16/2006 14.0 79.6 ND ND 6.39 8/16/2006 13.0 79.5 ND ND 7.51 12/27/2006 14.6 79.4 ND ND 6.06 6/19/2007 15.9 78.7 ND ND 5.39 9/21/2007 15.5 78.2 ND ND 6.36 12/3/2007 16.6 77.9 ND ND 5.44 7/14/2005 10.5 79-3 ND ND 10.2 9/28/2005 12.0 77.1 ND ND 10.9 10/13/2005 11.1 79.5 ND ND 9.4 5/16/2006 14.6 79.8 ND ND 5.62 8/16/2006 13.7 79.7 ND ND 6.68 12/27/2006 14.7 79.6 ND ND 5.68 6/19/2007 18.0 78.7 ND ND 3.31 9/21/2007 16.0 78.5 ND ND 5.56 12/3/2007 15.8 78.0 ND ND 6.26 Page umo SOIL VAPOR SAMPLING ANALYTICAL DATA (FIXED GASES) Shell Service Station 4050 Gosford Road, Bakersfield, CA 10/13/2005 8.5 78.9 ND ND 12.6 5/16/2006 11.9 79.5 ND ND 8.58 8/16/2006 11.1 79.1 ND ND 9.81 12/27/2006 21.5 77.8 ND ND 0.69 6/19/2007 14.9 78.5 ND ND 6.64 9/21/2007 14.8 77.5 ND ND 7.71 12/3/2007 16.1 77.7 ND ND 6.27 4/14/2005 8ml 80.6 ND ND 11.3 10/13/2005 10.2 79.4 ND ND 10.5 5/16/2006 13.1 79.8 ND ND 7.06 8/16/2006 12.6 79.4 ND ND 8.05 12/27/2006 14.4 79.5 ND ND 6.10 6/19/2007 15.0 78.8 ND ND 6.13 9/21/2007 15.0 78.2 ND ND 6.74 12/3/2007 15.7 77.6 ND ND 6.72 Page xovs TABLE 2 SOIL VAPOR SAMPLING ANALYTICAL DATA (FIXED CASES) Shell Service Station 4050 Cosford Road, Bakersfield, CA Ar.. ....... o :: M ....... ... et . . an. .:.d. .... .Ca[ o e . o M botgiD ... : z:i:d:e U 81.5 ND4/14/2005 (1 MIN) 6.9 ND 11.5 4/14/2005 (2 MIN) 6.8 81.6 ND ND 11.6 4/14/2005 (5 MIN) 8.0 82.1 ND ND 9.9 5/18/2005 7.8 81.3 ND ND 10.9 6/20/2005 6.8 81.2 ND ND 12.0 7/14/2005 7.8 79.7 ND ND 12.5 8/9/2005 8.5 78.8 ND ND 12.8 9/28/2005 9.8 76.8 ND ND 13.4 10/13/2005 8.8 79.5 ND ND 11.7 2/1/2006 11.0 79.8 ND ND 9.2 5/16/2006 12.8 79.6 ND ND 7.54 8/16/2006 13.0 79.1 ND ND 7.96 12/27/2006 14.2 79.1 ND ND 6.64 3/8/2007 15.1 78.7 ND ND 6.14 6/19/2007 14.7 78.5 ND ND 6.78 9/21/2007 14.4 77.9 ND ND 7.62 12/3/2007 15.9 77.5 ND ND 6.59 3/5/2008 16.3 77.70 ND ND` s 5.95 VEW-46 M P tir 44 Y L'a *$w: s k R 4/14/2005 (1 (1 MIN) 8.6 81.6 ND ND 9.8 4/14/2005 (2 MIN) 9.5 81.2 ND ND 9.3 4/14/2005 (5 MIN) 8.7 81.7 ND ND 9.7 5/18/2005 133 80.0 ND ND 6.6 6/20/2005 9.1 81.1 ND ND 9.7 7/14/2005 11.7 79.8 ND ND 8.5 8/9/2005 9.8 79.6 ND ND 10.6 9/28/2005 10.2 77.8 ND ND 12.0 10/13/2005 10.2 803 ND ND 9.5 2/1/2006 12.6 80.2 ND ND 7.1 5/16/2006 13.9 80.1 ND ND 6.07 8/16/2006 13.6 79.9 ND ND 6.51 12/27/2006 14.8 79.7 ND ND 5.47 3/8/2007 15.7 79.4 ND ND 4.93 6/19/2007 153 79.1 ND ND 5.62 9/21/2007 15.5 79.1 ND ND 5.46 12/3/2007 15.2 78.2 ND ND 6.53 3/5/2008 16.1 78.5 ND ND 5.42 Page 4 of 5 TABLE SOIL VAPOR SAMPLING ANALYTICAL DATA (FIXED GASES) Shell Service Station 4050 Gosford Road, Bakersfield, CA itrogen VEW-5A ND ON= 12.54/14/2005 5.7 81.8 ND 5/18/2005 10.0 80.2 ND ND 9.8 6/20/2005 3-3 81.6 ND ND 15.1 7/14/2005 5.8 79.9 ND ND 14.3 8/9/2005 4.5 79.8 ND ND 15.7 9/28/2005 5.2 76.9 ND ND 17.9 10/13/2005 7.7 79.8 ND ND 12.6 2/1/2006 11.8 79.7 ND ND 8.5 5/16/2006 12.9 79.7 ND ND 7.44 8/16/2006 11.4 79.5 ND ND 9.13 12/27/2006 14.0 79.2 ND ND 6.83 3/8/2007 15.3 79.0 ND ND 5.68 6/19/2007 NS NS NS NS NS 9/21/2007 14.6 78.2 ND ND 7.20 12/3/2007 15.2 77.8 ND ND 6.97 3/5/2008 16.1 78.2 ND ND 5.79 VEW-5B_!,,jKjM1WjjjUn ND ND MR01192mmm'm 9.54/14/2005 10.2 80.3 5/18/2005 12.4 79.9 ND ND 7.7 6/20/2005 8.4 80.4 ND ND 11.2 7/14/2005 11.5 79-3 ND ND 9.2 8/9/2005 9.1 793 ND ND 11.6 9/28/2005 9.8 77.2 ND ND 13.0 10/13/2005 10.8 79.8 ND ND 9.4 2/1/2006 12.9 79.9 ND ND 7.2 5/16/2006 14.2 79.9 ND ND 5.86 8/16/2006 13.0 79.8 ND ND 7.24 12/27/2006 14.9 79.6 ND ND 5.50 3/8/2007 15.8 79.4 ND ND 4.80 6/19/2007 NS NS NS NS NS 9/21/2007 15.2 78.8 ND ND 6.08 12/3/2007 15.7 78.0 ND ND 6.27 3/5/2008 16.2 78.5 ND ND 5.32 Notes: ND - Not detected above limit noted; NS - not sampled Page 5 of 5 0 Y:LShell Srtes \4\4050 GosfOid\2008-04- XX_1Q08 GWM Report \FIGURES (4050GOSFM)_1Q08GWMAwq, MAP, 4/11/2008 3:41:14 PM o LEGEND 0 NESTED VAPOR WELL LOCATION AND DESIGNATION TPH -g L0 AS GASOLINE o LANTER MTBE METHYL TERT -BUM J Q ETHER a U TERT -BUM ALCOHOL L cf) CANOPY ND< NOT DETECTED ABOVE LIMIT NOTED F- PLANTER CAR U W WASH STATION W m BUILDING 0O :2 VEW -48 VEW -4 D' z:) DATE TPHG BENZE\'E TOLUENE ETMI, TOTAL NITBE T13A a z VEW -1 YEW -3 (TYP) BESIENE X1IENESI I ILLL /L L L 3/512008 ND4.0 I ND-zO.00161 0.0053 ND10.0022 NDm.0043 NDm.W, ND,0.01 mm VEW -SA DATE TPHG BENMT TOLUENE ETHYL TOTAL NITBE TBA BEN21NE XNLENESIWLLL /L L L O 3/512008 NDG3.0 ND<0.0016 0.0088 ND10.0022 ND1O.0043 0.024 ND10.01 O_ YEW-5B Q DATE TPHG BEN7EIF. TOLUENE EISiVG TOTAL 1N1BE TBA BEN7EVE X17.ENES 3192008 ND<3.0 I MD<0.00161 0.0074 ND<0.0022 NDm.0O43 ND <O.0072 ND<D.IX VEW -2A DATE TPIiG BEN7ENE TOLUENE EIBI'L TOTAL F TBA m I I BENZENE XILENESILLL /L L W 3/512008 NDq.O N'D.0016 0.0095 NDm.0022 ND<0.0043 0.027 N'lld),IX y EFV -28 L) DATE TPHG BENZENE TOLUENE E M'L, TOTAL A]IBE TBAWBENZENEXllNES U L L IL L) OTJL t 3/5!2008 NDGi.O ND.0016 0.00909O.0 NDm.0022 0.0045 ND.0072 ND<O.IXm0 Q o Q mvIN 1 Z 3 VD DATE TP TOLUENE Ef1iYL TOTAL MfBE TBA j BENZENE XYLENES ii L L L) /L L ./L iDDS D,1.O ND<1.0016 0.0076 ND<0.00221 0.0045 0.014 ND<0.O NIBNA B DATE TPII -G BENTEVE TOLUENE E11117r TOTAL til'BE TB.+ BENZENE \11iNES L) L) L L) 1 3/92008 ND<).0 ND<O.OD16 0.0094 ND<O.OM ND<0.O43 0.011 NDm.( VEXV-3A DATE TPHG BEV%EI'E TOLLEIE EnBl- TOTAL MBE TBA B01WKE X11.171'ES L L L /L L g 3/5/2008 1, Q.O ND-cD.0016 1 -46 ND<0.0022 NDm.0O43 0.014 1LL> O( VBV -3B DATE TPHG Bo, 7z NE TOLUINE ETHYL TOTAL MIKE TBArIBENZENEXILEYESIILLLLL) 3/512008 4.8 NDm.0016 0.0073 NDIO.O022 NDm.0O43 0.94 NDm.O( w UN O Y:LShell Sites \4 \4050 GosFord\20O8- 04- XX_IQ08 GWM Report\FIGURES (4050 GOSFORD) SQ08 GWM.dwg, CONCENTRATION MAP, 4/11120083:39:13PM N W E S PLANTER ID E LTA CONSULTANTS SHELL OIL PRODUCTS US SHELL SERVICE STATION BAKERSFIELD, CALIFORNIA FIGURE 3 SOIL VAPOR ANALYTICAL RESULTS 3/5/2008 4050 GOSFORD ROAD BAKERSFIELD. CALIFORNIA LEGEND VEW -1 1 NESTED VAPOR WELL LOCATION AND DESIGNATION TPH -g TOTAL PETROLEUM HYDROCARBONS AS GASOLINE Fp LANTER MTBE METHYL TERT -BUM J ETHER a TBA TERT -BUM ALCOHOL L MICROGRAMS PER LITER CANOPY ND< NOT DETECTED ABOVE LIMIT NOTED PLANTER CAR WASH STATION VEW -5BUILDING VEW -4 VE - UST VEW -1 YEW -3 (TYP) DISPENSER ISLAND TYP ) PLANTER ID E LTA CONSULTANTS SHELL OIL PRODUCTS US SHELL SERVICE STATION BAKERSFIELD, CALIFORNIA FIGURE 3 SOIL VAPOR ANALYTICAL RESULTS 3/5/2008 4050 GOSFORD ROAD BAKERSFIELD. CALIFORNIA FIGURES R-%q. w IURVA SOIL VAPOR SAMPLING LABORATORY REPORT O CHAIN-OF- CUSTODY DOCUMENTATION Page 1 of 17 alsciencea nvironmental I - P. aboratories, Inc. March 13, 2008 Ross Inouye Delta Environmental Consultants, Inc. 911 South Primrose Avenue, Unit K Monrovia, CA 91016 -8403 Subject: Calscience Work Order No.: 08 -03 -0454 Client Reference: 4050 Gosford Rd., Bakersfield, CA Dear Client: Enclosed is an analytical report for the above - referenced project. The samples included in this report were received 3/6/2008 and analyzed in accordance with the attached chain -of- custody. Unless otherwise noted, all analytical testing was accomplished in accordance with the guidelines established in our Quality Systems Manual, applicable standard operating procedures, and other related documentation. The original report of subcontracted analysis, if any, is provided herein, and follows the standard Calscience data package. The results in this analytical report are limited to the samples tested and any reproduction thereof must be made in its entirety. If you have any questions regarding this report, please do not hesitate to contact the undersigned. 1 Sincerely, Calscience Environmental Laboratories, Inc. Thy Vo Project Manager ELAP ID: 1230 NELAP ID: 03220CA CSDLAC ID: 10109 SCAQMD ID: 93LA0830 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 1 Page 2 of 17 alscience Jt_nvironmental Analytical Reports aboratories, Inc.` Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: ASTM D -1946 Units: %v Project: 4050 Gosford Rd., Bakersfield, CA Page 1 of 2 Lab Sample Date/Time Date Date/Time Client Sample Number Number Collected Matrix instrument Prepared Analyzed QC watch iD VE -1A 3/0 3408 -03- 0454 -1=8 0 " '4- NIA'` 03/06/08 "_` 0803061-01` " -y 12:00 19.52 Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 17.4 0.500 1 Carbon Dioxide 4.39 0.500 1 Nitrogen 78.2 0.500 1 Carbon Monoxide ND 0.500 1 VE -1 B 08 -03-0454 2 -B 03 /05108 Air GC 34 NIA 03/06108 0803061-01 12:20 20:28 Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 16.5 0.500 1 Carbon Dioxide 5.09 0.500 1 Nitrogen 78.4 0.500 1 Carbon Monoxide ND 0.500 1 VE -2A' " "08 -03-04543 -B : -- 03105108 "' "" Air GC 214 N/A 03 /06/08 _ 08030611-01k, 12:42 21:14 Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 16.8 0.500 1 Carbon Dioxide 5.21 0.500 1 Nitrogen 78.0 0.500 1 Carbon Monoxide ND 0.500 1 VE -2B,, 08 -0340454 -4-B 03/05/08 Air GC 34 N/A 03/06/08 0803061-01 12:55 22 07 Parameter Result RL DF Qua] Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 16.3 0.500 1 Carbon Dioxide 5.33 0.500 1 Nitrogen 78.3 0.500 1 Carbon Monoxide ND 0.500 1 VE -3A;" ` o• x 08 -03-0454 -5-B 03105108. Air GC.34 NIA 03/06/08 _ 080306L0,1y ; 13:25 22:44 Parameter Result RL DF gual Parameter Result R DF Qual Methane ND 0.500 1 Oxygen + Argon 17.0 0.500 1 Carbon Dioxide 5.46 0.500 1 Nitrogen 77.6 0.500 1 Carbon Monoxide ND 0.500 1 VE -313 A08-03-0454 6 8 03/05108 Afr GC 34 NIA 03 /06/08 0803061-01' z 13:38 23:20 Parameter Result RL DF Qual Parameter Result RL OF Qual Methane ND 0.500 1 Oxygen + Argon 16.2 0.500 1 Carbon Dioxide 5.86 0.500 1 Nitrogen 77.9 0.500 1 Carbon Monoxide ND 0.500 1 RL - Reporting Limit , DF - Dilution Factor , Qual - Qualifiers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 jL alscience nvironmental 19 J. aboratories, Inc. Analytical Report Page 3 of 17 S, L Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: ASTM D -1946 Units: %v Project: 4050 Gosford Rd., Bakersfield, CA Page 2 of 2 Lab Sample Daterrime Date Daterrime Client Sample Number Number Collected Matrix Instrument Prepared Analyzed uk, Dmui u VE-4A 08 -03- 0454 - 03/05/08 Air GC 34 N /A. 3/06108- 080306L01'.- r. ._ ,= - 7 -B 14:00 ffi s 23 rah q e Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 16.3 0.500 1 Carbon Dioxide 5.95 0.500 1 Nitrogen 77.7 0.500 1 Carbon Monoxide ND 0.500 1 ti GC 34 N/A ., 'p3 /07VE -4B 08 -03- 0454 -8 -B 03/05/08 Air a /08 080306L047 3z - 14:18 00:43 Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 16.1 0.500 1 Carbon Dioxide 5.42 0.500 1 Nitrogen 78.5 0.500 1 Carbon Monoxide ND 0.500 1 AYE -SAS' , = 08 -03-0454 -9 -B 03/05/08 . Air., ,;, GC 34 N /A, 03/07/08 , 080307L01:. 14:45 16M, Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon 16.1 0.500 1 Carbon Dioxide 5.79 0.500 1 Nitrogen 78.2 0.500 1 Carbon Monoxide ND 0.500 1 VE -56 08 -03- 0454 -10-B 03/05/08 Air GC 34 N/AJ 03107/08 -`0803071-09 1. 11 26 Parameter Result RL DF Qual Parameter Result RL DF Qua[ Methane ND 0.500 1 Oxygen + Argon 16.2 0.500 -1 Carbon Dioxide 5.32 0.500 1 Nitrogen 78.5 0.500 1 Carbon Monoxide ND 0.500 1 Method Blank" ".' 099 -03 -00299 NIA Air GC 34 ° - NIA X03106108 >;080306L0f= 08:31 Parameter Resu RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon ND 0.500 1 Carbon Dioxide ND 0.500 1 Nitrogen ND 0.500 1 Carbon Monoxide ND 0.500 1 Method Blank , „ . 099 -03 -002 -500 N/A Air GC 34 NIA 03/07/08 080307L01 Parameter Result RL DF Qual Parameter Result RL DF Qual Methane ND 0.500 1 Oxygen + Argon ND 0.500 1 Carbon Dioxide ND 0.500 1 Nitrogen ND 0.500 1 Carbon Monoxide ND 0.500 1 W4 RL - Reporting Limit , DF - Dilution Factor , Qual - Qualifiers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 Page 4 of 17 alscience C nvironmental Analytical Report aboratories, Inc. Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: EPA TO -3M tProject: 4050 Gosford Rd., Bakersfield, CA Page 1 of 2 Lab Sample Date/Time Date Date/Time Client Sample Number Number Collected Matrix Instrument PreparePrepared Analyzed QC Batch ID 08 -03-04541 A 03/05/08 Air Gc 13 WA 03/06/08 08030GL01 12:00 15:53 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (V/V) q- r VE -1B 08 -03- 0454 -2 -A, 03/05/08 Air GC 13 WA. 03/06/08 ° 080306L01 W'," T a ,x,. . 12:20 Y 16:03 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (V/V) VE-2A , µ 08=03- 0454 -3 -A 03/05/08 Air _ _ GC 13 . WA - 03/06/08., 08030,611-01 12:42 16:13 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (V/V) VE -2B - - *' 08 -03- 0454 =4-A° 03/05108 Air GC 13 X N/A " 03/06/08:" 06030SL61 12:55 16:28 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (V/V) VE -3A' 4. 08. 03-0454-0 -A ' 03/05/08 Air GC 13 WA 03/06/08 0803061L01 13:25.- 16:37 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (V/V) VE -313 08 -03- 0454 -6 -A y Y03/ 05/08 Air 1 38 GC 13 WA 03/06/08 080306L01 16:49 " Parameter Result RL DF Qua] Units TPH as Gasoline 4.8 3.0 1 ppm (V /V) RL - Reporting Limit DF - Dilution Factor ApK Qual - Qualifiers kA 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 5494 FAX: (714) 894 -7501 Page 5 of 17 r alscience Z- nvironmental Analytical Report aboratories, Inc. Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: EPA TO -3M Project: 4050 Gosford Rd., Bakersfield, CA Page 2 of 2 Lab Sample Date/Time Date Date/Time Client Sample Number Number Collected Matrix Instrument Prepared Analyzed QC Batch ID vE-4A 08 -03- 0454 -7 -A 03/05108 Air GC 13 N/A 03106/08 080306L01, 06x, 14:00_ 17:01 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (v /v) VE4B 08 -03 04548 A 03I05108 Air GC13 ` N1A -' 03/06/08 0803061-01` 14:18 17:15 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (v/v) VE -SA,.- r - 03 -0454 -9 A .' 0310508 Air GC 13 N/A08 03106/08 0803061-01 14:45 , . 17.25 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (v /v) VE -5B 08 -03= 0454 -10 -A 03105/08 Air GC 13 N/A 03/06/08't 080306L01 " Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (v /v) Method Blank N_= :`'098 -01- 0054;205e NIA Air 6 -' GC 13 NIA : " 03/06108,; 0803061-01. 08:37 Parameter Result RL DF Qual Units TPH as Gasoline ND 3.0 1 ppm (v /v) eporting Limit DF - Dilution Factor Qual - Qualifiers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 FAX: (714) 894 -7501 Parameter Result Page 6 of 17 a alscience Parameter Result C nvironmental Analytical Report Benzene J. 0.0016 1 aboratories, Inc. 0.014 Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Ethylbenzene Method: EPA TO -15 Units: ug /L Project: 4050 Gosford Rd., Bakersfield, CA 1 Page 1 of 4 Client Sample Number Lab Sample Date/Time Number Collected Matrix Date Date/Time Instrument Prepared Analyzed QC Batch ID 3 08 -034)454 -1 -A , 03105/08:, w._Air- . GCIMS NN# =t--, N/A 03/07/08_. 0803071-01 , a 1 o-Xylene 12:00 20:36'' Parameter Result RL DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) 0.014 0.0072 1 Toluene 0.0076 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene 0.0045 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl - Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC M Control Qual Surrogates: REC M Control Qual Limits Limi s 1,4- Bromofluorobenzene 85 57 -129 1,2- Dichloroethane-04 85 47 -137 Toluene -d8 90 78-156 VE 18 08 -03- 0454 -2,A " , 03/05108 Airy. GC/MS NN ,. .NIA 03/07108,, 0. 803071-01 12:20 21:25. Parameter Result RL- DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) 0.011 0.0072 1 Toluene 0.0094 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl -Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC M Control Qual Surrogates: REC (°/a) Control Qual Limits Limits 1,4- Bromofluorobenzene 88 57 -129 1,2- Dichloroethane-d4 87 47 -137 Toluene -d8 94 78-156 VE =2A _ - 9 ., 08-03- 04543 -A -, 03105/08 Air . GCIMS NN N/A 03/07/08. „0803071-01 1 12:42 Parameter Result RL Benzene ND 0.0016 Toluene 0.0095 0.0019 Ethylbenzene ND 0.0022 p /m- Xylene ND 0.0043 o-Xylene ND 0.0022 Surrogates: REC M Control LimitsLimits 1,4- Bromofluorobenzene 86 57 -129 Toluene -l8 91 78-156 DF Qua] Parameter 1 Methyl -t -Butyl Ether (MTBE) 1 Tert-Butyl Alcohol (TBA) 1 Diisopropyl Ether (DIPE) 1 Ethyl -t -Butyl Ether (ETBE) 1 Tert -Amyl -Methyl Ether (TAME) Qual Surrogates: 1 1,2- Dichloroethane-d4 Result RL DF Qual 0.027 0.0072 1 ND 0.0061 1 ND 0.0084 1 ND 0.0084 1 ND 0.0084 1 REC M Control Qual Limits 85 47 -137 RL - Reporting Limit , DF - Dilution Factor , Qual - Qualifiers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 Page 7 of 17 alscience ic= nvironmental Analytical Report L aboratories, Inc. Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: EPA TO -15 Units: ug /L Project: 4050 Gosford Rd., Bakersfield, CA Page 2 of 4 Lab Sample Date/Time Date Daterrime Client Sample Number Number Collected Matrix instrument Prepared Analyzed uk, oatul Lj VE2B - 08=03-04544-A 1 03/05/08 Air GC /MS NN N/A 03/07/08 0803071-01; 12:55 23:01 Parameter Result RL DF Qual Parameter Result RL DF Clual Benzene ND 0.0016 1 Methyi4 -Butyl Ether (MTBE) ND 0.0072 1 Toluene 0.0090 0.0019 1 Tert -Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene 0.0045 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl -Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC (%) Control Qual Qual Surrogates: REC (%) Control Qual Limits Limits 1,4- Bromofluorobenzene 87 57 -129 1,2- Dichioroethane-04 86 47 -137 Toluene -d8 92 78-156 08 030454 -5 -A 03105/08 Air GCIMS NN` NIA 03/07/Oi3 080307LOW 13:25 23:50 Parameter Result RL DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) 0.014 0.0072 1 Toluene 0.0046 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xyiene ND 0.0022 1 Tert- Amyl -Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC.( %) Control Qual Surrogates: REC ( %) Control Qual Limits Limits 1,4- Bromofluorobenzene 86 57 -129 1,2- Dichloroethane-04 85 47 -137 Toluene -d8 91 78-156 NN:, „0803071-01VE3B003= 0458 =A 03/05108 ' "Alr ,GC/MS N/A 03/08/08 - zy3:38 00:39 = Parameter Result RL Benzene ND 0.0016 Toluene 0.0073 0.0019 Ethylbenzene ND 0.0022 p /m- Xylene ND 0.0043 o-Xylene ND 0.0022 Surrogates: REC M Control LimitsLimits 1,4- Bromofluorobenzene 87 57 -129 Toluene -d8 93 78-156 DF Qual Parameter 1 Methyl -t -Butyl Ether (MTBE) 1 Tert-Butyl Alcohol (TBA) 1 Diisopropyl Ether (DIPE) 1 Ethyl -t -Butyl Ether (ETBE) 1 Tert- Amyl - Methyl Ether (TAME) Qual Surrogates: 1,2- Dichloroethane -d4 Result RL DF Qual 0.94 0.72 100 ND 0.0061 1 ND 0.0084 1 ND 0.0084 1 ND 0.0084 1 REC (%) Control Qual Limits 85 47 -137 W4 RL - Reporting Limit , DF - Dilution Factor , Qual - Qualifiers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 Page 8 of 17 O a /science N " FnvironmentalAnalyticalReport aboratories, Inc. Delta Environmental Consultants, Inc. Date Received: 03/06/08 911 South.Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403. Preparation: N/A Method: EPA TO -15 Units: ug /L Project: 4050 Gosford Rd., Bakersfield, CA Page 3 of 4 Lab Sample Date/Time Date Date/rime nn o..a -,r. rr Client Sample Number Number Collected 'vreurx rrrsuwncrn Prepared Analyzed 11- °r""" VE-4A ' 08 -03 0454 7 -A 03105/08 Afr GC /MS NN NIA 03/08108 0803071-01 14:00 01:26 Parameter Result RL DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) 0.0081 0.0072 1 Toluene 0.0079 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl - Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC (%) Control Qual Surrogates: REC ( %) Control Qual Limits Limits 1,4- Bromofluorobenzene 86 57 -129 1,2- Dichloroethane-d4 86 47 -137 Toluene -d8 88 78-156 VE-413 08 -034)454 -8 -A 03105/08 Air "IGC/MSNN N/A 03/08108 0803071-01 " - 14:18 02:14 Parame er Result RL DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) ND 0.0072 1 Toluene 0.0053 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl - Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC (%) Control Qual Surrogates: REC (%) Control Qual Limits Limits 1,4- Bromofluorobenzene 87 57 -129 1,2- Dichloroethane-04 86 47 -137 Toluene-08 89 78-156 VE -SA 08-03- 0454.9 -A 03/05/08 Alr GCIMS NN N/A 03/08/08 080307L01 14:45 03:02 Parameter Result RL Benzene ND 0.0016 Toluene 0.0088 0.0019 Ethylbenzene ND 0.0022 p /m- Xylene ND 0.0043 o-Xylene ND 0.0022 Surrogates: REC ( %) Control LimitsLimits 1,4- Bromofluorobenzene 85 57 -129 Toluene -d8 89 78-156 DF Qual Parameter 1 Methyl -t -Butyl Ether (MTBE) 1 Tert-Butyl Alcohol (TBA) 1 Diisopropyl Ether (DIPE) 1 Ethyl -t -Butyl Ether (ETBE) 1 Tert- Amyl - Methyl Ether (TAME) Qual Surrogates: 1,2- Dichloroethane -d4 Result RL DF Qual 0.024 0.0072 1 ND 0.0061 1 ND 0.0084 1 ND 0.0084 1 ND 0.0084 1 REC (%) Control Qual Limits 85 47 -137 rcepuruny unnr , u - uiwuun rduwr I wuai - wukuniers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL(714) 895 -5494 • FAX: (714) 894 -7501 Result RL Page 9 of 17 alscience Result RL DF Qual Benzene ND 0.0016 1 ic-nvironmental Analytical Report 1 Toluene 0.0074 0.0019 aboratories, Inc. Tert-Butyl Alcohol (TBA) ND 0.0061 Delta Environmental Consultants, Inc. Date Received: ND 03/06/08 911 South Primrose Avenue, Unit K Work Order No: ND 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: ND N/A 1 Method: ND EPA TO -15 1 Units: ND ug /L Project: 4050 Gosford Rd., Bakersfield, CA Tert- Amyl -Methyl Ether (TAME) ND Page 4 of 4 Client Sample Number Lab Sample Daterrime Number Collected Matrix Date Instrument Prepared Daterrime Analyzed QC Batch ID VE -513,1 = - , *08-03-0454-10-A, 03/05/08 Air ' GC/MS NN - N/A 03/08/08 °`080307L01'" ` Qual 15:05 Limits 03249& Parameter Result RL DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) ND 0.0072 1 Toluene 0.0074 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p /m- Xylene ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl -Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC (%1 Control Qual Surrogates: REC (%) Control Qual Limits Limits 1,4- Bromofluorobenzene 86 57 -129 1,2- Dichloroethane-d4 86 47 -137 Toluene-08 90 78-156 Method Blankr 097 -09-002 - 8,876-- N/A -Air - 'GC /MS'NN ' N/A" 03/07108 '108030711_01 a 4. 11 00, Parameter Result RL DF Qual Parameter Result RL DF Qual Benzene ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) ND 0.0072 1 Toluene ND 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0061 1 Ethylbenzene ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0084 1 p/m- Xylene ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0084 1 o-Xylene ND 0.0022 1 Tert- Amyl -Methyl Ether (TAME) ND 0.0084 1 Surrogates: REC M Control Qual Surrogates: REC (%) Control Qual Limits Limits 1,4- Bromofluorobenzene 89 57 -129 1,2- Dichloroethane -l4 94 47 -137 Toluene -d8 95 78-156 Method Blank- 097 -09 = 002 -0,898 N/A Air" 6 MS NN N/A' 03/08108 080308L01 g - 7 _ , ,,r .1046', Parameter Benzene Toluene Ethylbenzene p/m- Xylene o-Xylene Surrogates: 1,4- Bromofluorobenzene Toluene -d8 Result RL DF Qual Parameter ND 0.0016 1 Methyl -t -Butyl Ether (MTBE) ND 0.0019 1 Tert-Butyl Alcohol (TBA) ND 0.0022 1 Diisopropyl Ether (DIPE) ND 0.0043 1 Ethyl -t -Butyl Ether (ETBE) ND 0.0022 1 Tert- Amyl -Methyl Ether (TAME) REC (%) Control Qual Surrogates: Limits 93 57 -129 1,2- Dichloroethane -d4 96 78-156 Result RL DF Qual ND 0.0072 1 ND 0.0061 1 ND 0.0084 1 ND 0.0084 1 ND 0.0084 1 REC ( %) Control Qual Limits 94 47 -137 RL - Reporting Limit , DF - Dilution Factor , Qual - Qualifiers 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 1 6,A/science1 nvironmental AL aboratories, Inc. Delta Environmental Consultants, Inc. 911 South Primrose Avenue, Unit K Monrovia, CA 91016 -8403 Quality Control - Duplicate Project: 4050 Gosford Rd., Bakersfield, CA Page 10 of 17 Date Received: 03/06/08 Work Order No: 08 -03 -0454 Preparation: N/A Method: EPA TO -3M RPD - Relative Percent Difference , CL - Control Limit 7440 Lincoln Way, Garden Grove, CA 92841 -1427 . TEL:(714) 895 -5494 . FAX: (714) 894 -7501 Date Date Duplicate Batch Quality Control Sample ID Matrix Instrument Prepared: Analyzed: Number 08 -03- 0453 -5 Air GC 13 NIA .. _ 03106108,E 080306D01.- Parameter Sample Conc DUP Conc RPD RPD CL Qualifiers TPH as Gasoline 69 68 1 0 -20 RPD - Relative Percent Difference , CL - Control Limit 7440 Lincoln Way, Garden Grove, CA 92841 -1427 . TEL:(714) 895 -5494 . FAX: (714) 894 -7501 alscience j=_nvironmental a f. aboratories, Inc. Quality Control - LCS /LCS Duplicate Delta Environmental Consultants, Inc. 911 South Primrose Avenue, Unit K Monrovia, CA 91016 -8403 Project: 4050 Gosford Rd., Bakersfield, CA Date Received: Work Order No: Preparation: Method: Page 11 of 17 N L'?:_ °S N/A 08 -03 -0454 N/A ASTM D -1946 Date Date LCS /LCSD Batch Quality Control Sample ID Matrix Instrument Prepared Analyzed Number 099-03-002-499- a ., _; Air . GC 34 "a _ K/A - 03106/08 r 080306L01 Parameter LCS Conc LCSD Conc RPD RPD CL Qualifiers Carbon Dioxide 5.166 5.155 0 D-30 Oxygen + Argon 20.54 20.51 0 0-30 Nitrogen 76.15 76.08 0 0 -30 RPD - Relative Percent Difference , CL - Control Limit 7440 Lincoln Way, Garden Grove, CA 92841 -1427 . TEL:(714) 895 -5494. FAX: (714) 894 -7501 Page 12 of 17 alscience aw_nvironmental Quality Control - L.CS /LCS Duplicate ` aboratories, Inc.1 Delta Environmental Consultants, Inc. Date Received: N/A 911 South. Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: ASTM D -1946 Project: 4050 Gosford Rd., Bakersfield, CA Date Date LCS /LCSD Batch Quality Control Sample ID Matrix Instrument Prepared Analyzed Number 099 -03 -002 -500 AirT b GC 34 MIA 03/07/08 , - 080307L01_ r Parameter LCS Conc LCSD Conc RPD RPD CL Qualifiers Carbon Dioxide 5.188 5.151 1 0 -30 Oxygen + Argon 20.65 20.51 1 0-30 Nitrogen 76.54 76.02 1 0-30 RPD - Relative Percent Difference , CL - Control Limit 7440 Lincoln Way. Garden Grove. CA 92841 -1427 . TEL:(714) 895 -5494 - FAX: (714) 894 -7501 alscience nvironmental tw aboratories, Inc. Quality Control - LCS /LCS Duplicate Page 13 of 17 Delta Environmental Consultants, Inc. Date Received: N/A 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA 91016 -8403 Preparation: N/A Method: EPA TO -15 Project: 4050 Gosford Rd., Bakersfield, CA Date Date LCS /LCSD Batch Quality Control Sample ID Matrix Instrument Prepared Analyzed Number 097-09-002 - 6,878 „ _ ,Air ,GC/MS NN- -,NIA° 03/07/08 080307L01 Parameter LCS %REC LCSD %REC REC CL RPD RPD CL Qualifiers Benzene 114 122 60 -156 6 0-40 Toluene 120 129 56 -146 7 0-43 Ethylbenzene 117 124 52 -154 6 0 -38 p /m- Xylene 111 118 42 -156 6 0-41 o-Xylene 114 121 52 -148 6 0 -38 RPD - Relative Percent Difference , CL - Control Limit 7440 Lincoln Way, Garden Grove, CA 92841 -1427 . TEL:(714) 895 -5494 . FAX: (714) 894 -7501 alscience nvironmental aboratories, Inc. Quality Control - LCS /LCS Duplicate Page 14 of 17 r jsi Delta Environmental Consultants, Inc. Date Received: N/A 911 South Primrose Avenue, Unit K Work Order No: 08 -03 -0454 Monrovia, CA.91016 -8403 Preparation: N/A Method: EPA TO -15 Project: 4050 Gosford Rd., Bakersfield, CA Date Date LCS /LCSD Batch Quality Control Sample ID Matrix Instrument Prepared Analyzed Number F097.-09- 002 - 6,898 Alr GUMS NN 'WA ; 03/08108 080308L01 Parameter LCS %REC LCSD %REC REC CL RPD RPD CL Qualifiers Benzene 132 119 60-156 10 0-40 Toluene 137 127 56-146 8 0-43 Ethylbenzene 135 127 52 -154 7 0-38 p /m- Xylene 130 121 42 -156 7 0-41 o-Xylene 134 126 52 -148 6 0-38 RPD - Relative Percent Difference , CL - Control Limit 7440 Lincoln Way, Garden Grove, CA 92841 -1427 . TEL:(714) 895 -5494 . FAX: (714) 894 -7501 Page 15 of 17 s cience nvironmental Glossary of Terms and Qualifiers A. aboratories, Inc. Work Order Number: 08 -03 -0454 Qualifier Definition See applicable analysis comment. 1 Surrogate compound recovery was out of control due to a required sample dilution, therefore, the sample data was reported without further clarification. 2 Surrogate compound recovery was out of control due to matrix interference. The associated method blank surrogate spike compound was in control and, therefore, the sample data was reported without further clarification. 3 Recovery of the Matrix Spike (MS) or Matrix Spike Duplicate (MSD) compound was out of control due to matrix interference. The associated LCS and /or LCSD was in control and, therefore, the sample data was reported without further clarification. 4 The MS /MSD RPD was out of control due to matrix interference. The LCS /LCSD RPD was in control and, therefore, the sample data was reported without further clarification. 5 The PDS /PDSD associated with this batch of samples was out of control due to a matrix interference effect. The associated batch LCS /LCSD was in control and, hence, the associated sample data was reported with no further corrective action required. A Result is the average of all dilutions, as defined by the method. B Analyte was present in the associated method blank. C Analyte presence was not confirmed on primary column. E Concentration exceeds the calibration range. H Sample received and /or analyzed past the recommended holding time. J Analyte was detected at a concentration below the reporting limit and above the laboratory method detection limit. Reported value is estimated. N Nontarget Analyte. ND Parameter not detected at the indicated reporting limit. Q Spike recovery and RPD control limits do not apply resulting from the parameter concentration in the sample exceeding the spike concentration by a factor of four or greater. U Undetected at the laboratory method detection limit. X % Recovery and /or RPD out -of- range. Z Analyte presence was not confirmed by second column or GC /MS analysis. 7440 Lincoln Way, Garden Grove, CA 92841 -1427 • TEL:(714) 895 -5494 • FAX: (714) 894 -7501 LAS(LOCAnON) 0 Shell Oil Products Chain Of Custody Record I(2 CAlSCIENCEI ' Pleas4 Cf)eak q.. ry rtdt0; 90X >:::::::::: P•ririt:9i11T)i:GiTilt;3tci: Name : ::::::::::::::::::1Ni"rID NT# 4Pt ER1!ICBS) : CHECK IF No INCIDENT /• APPLIES 13 spL Rand OrlowskiENV. SERVICES 110 MOTIVA RETAIL 11(3 SHELL RETAIL 9 7 3 3 7 2 6 6 DATE: 3 5 aQxErlco ( ) O MOTIVA SD Q CONSULTANT Q -aS TEST AMERICA UBan,a) i :•:•: : ii:::: i:: r:•... •:•:•:•:•:•:•.. Q i i: 4 . iIvie, i .}. . PAGE: Q OTHER ( O SHELL PIPELIN QOTHER 2 w, llqCOt1E: errsADDMMS; ab.r o,aMy ad. oa0: Delta Consultants 4050 Gosford Road Bakersfield CA mEfs 911 S. Primrose Ave Monrovia CA a<oaAFR.aEroW.iaCw.w,tenr..wmt Shelley Zhang NO: F6265.266.6662 szhangickleltme CONMTMrraOJER1q: ISCA4050GIXr•c*Pbdwy. rcr ROwra Ross Inouye, Marsaili Glllecriosd II r GL InMsrannou(exaoeaaawcom 626.256.6662 626256.6263 TURNAROUND TIME (CALENDAR DAYS} Q RESULTS NEEDED STANDARD (14 DAY) Qs DAYS Q 7 DAYS Cl2 DAYS Q24 HOURS ON WEEKEND REQUESTED ANALYSIS Q LA - RWQCB REPORT FORMAT Q UST AGENCY: s TEMPERATURE ON RECEIPT CQSHELLCONTRACTRATEAPPLIES SPECIAL INSTRUCTIONS OR NOTES: Q STATE REIMBURSEMENT RATE APPLIES n n C Please provide report In ppb andIIQi( Q EDD NOT NEEDED m m iEAQ Q RECEIPT VERIFICATION REQUESTED bd w S e gm o m o to f. 7pd 9AMPLJNG rRSaERVATwe Field Sample Identification ATRDI CONT. ti$1 r° W 99 beY' o u ContalnerPID Raadinya DATE TINE 16THER m m a m m E d7 or LaboratoryNWaa YN03 KMO4 NON! F to tlr000 H D QF W W a i I > VE -1A 7 7 0 Vapor 2 X X X ASTM 1946for oxygen i VE -18 Va r 2 X X X nitrogen, methane VE -2A Va r 2 X X X carbon dloxlde, and VE -2B Vapor 2 X X X carbon monoxide VE -3A 1 2! Vapor 2 X I X X VE-3B Vapor 2 X x X i` VE -4A I 'J. DO Vapor 1 2 1 1 1 1 X X X VEAB Vapor 2 X X X VE -5A 5 Vapor 2 X X X VE -5B Vapor 2 X X X Rs*wA .b.dbr: (WFwb.q Rw.N.d br. (6 p"n) D.I.: / Tb.: R.agblvd b'! (6lptmr.) b b/. (61pi.ar.) Dr.: R.a,p.Waby: R. W d by: (apl&r.) D.I.: v 0 M 1 Page 17 of 17 Akov - la"to WORK ORDER #:08 - D F31- 0 N t> 06 Cooler of1 SAMPLE RECEIPT FORM CLIENT: t DATE: TEMPERATURE - SAMPLES RECEIVED BY: CALSCIENCE COURIER: Chilled, cooler with temperature blank provided. Chilled, cooler without temperature blank. Chilled and placed in cooler with wet ice. Ambient and placed in cooler with wet ice. Ambient temperature. C Temperature blank. LABORATORY (Other than Calscience Courier): C Temperature blank. C IR thermometer. Ambient temperature. Initial: J'-" CUSTODY SEAL INTACT: Sample(s): Cooler: No (Not Intact) : Not Present: Initial: SAMPLE CONDITION: Yes No N/A Chain -Of- Custody document(s) received with samples ......................... ........ Sampler's name indicated on COC .................. ............................... ..... I . ....... Sample container label(s) consistent with custody papers ..................... ....... ....... Sample container(s) intact and good condition .... ............................... ...... . Correct containers and volume for analyses requested ....................... ....... Proper preservation noted on sample label( s) ...... ............................... VOA vial(s) free of headspace .......................... ............................... ' Tedlar bag(s) free of condensation .................... ............................... ....... . Initial: _1T COMMENTS: FIRE ARTM 40 Ronald I Fraze Fire Chief Gary Hutton Tyler Hartley Douglas Greener Deputy Chiefs HOWARD H. WINES, III DIRECTOR PREVENTION SERVICES 1501 Tnwtun Ave., I" Floor Bakersfield, CA 93301 VOICE: (661) 326 -3979 FAX: (661) 852 -2171 July 14, 2009 Mr. Philip L. Gilchrist, REA Delta Environmental 911 S. Primrose Ave Suite K Monrovia, CA 91016 Re: Work Plan for Soil Conformation Borings at the Shell Station 4550 Gosford Road, Bakersfield, Ca. Dear Mr. Gilchrist, I have reviewed the work plan for the Shell Station located 4550 Gosford Road, Bakersfield Ca. I would like to see some changes in the location of the borings including the addition of one more boring (CB- 4). First, move CB -2 closer to VEW 1A and 1 B, and add CB-4 (new) in the vicinity of VEW 2A and 2B so we could capture a better representative sample in the heaviest contaminated area. Second, readdress the sensitive receptor section of your work plan, these schools and care centers do not exist in the area. Please resubmit a correction action plan to this office within 30 days from receipt this letter. The work plan should follow the guidelines found in: Appendix A: Reports, Tri- Regional Board Staff Recommendations for Preliminary Investiaation and Evaluations of Underground Tank Sites: 16 April 2004. If you have any additional questions, please call me at (661) 326 -3684. i Sincerely, T PfR Craig Perkins REA ks Hazardous Materials Specialist L REA 1 -030 Expires: SUSTAINABLE STRATEGIES FOR GLOBAL LEADERS September 17, 2009 DELTA Project No. SCA405OG -1A SAP No. 121224 City of Bakersfield Fire Department Environmental Services 1501 Truxton Avenue, 1 st Floor Bakersfield, California 93301 Attention: Mr. Craig Perkins Re: Revised Work Plan for Soil Confirmation Borings Shell Branded Service Station 4050 Gosford Road Bakersfield, California Dear Mr. Perkins: On behalf of Equilon Enterprises LLC dba Shell Oil Products US (SHELL), Delta Consultants (DELTA) respectfully submits this Revised Work Plan for Soil Confirmation Borings in response to the August 3, 2009 City of Bakersfield Fire Department (CBFD) correspondence (Appendix A) for DELTA the above - referenced site. The correspondence was in response to the DELTA Workplan for Soil Confirmation Borings, submitted June 19, 2009, and expressed CBFD concern regarding the quantity and location of the proposed soil confirmation borings, as well as information contained in the sensitive receptor section of the workplan. This addendum addresses each of the concerns in the August 3, 2009 CBFD correspondence. The objectives of this work plan are to evaluate the potential for remaining vadose zone impacts at the subject site in anticipation of case closure. DELTA proposes to conduct on -site soil sampling at three confirmation soil borings (CB -1, CB -2, and C13-3) in selected locations to determine soil conditions. This work plan has been prepared to comply with the California Code of Regulations, Title 23, Division 3, Chapter 16, Article 11. The following site background information is provided and followed by a detailed scope of work for the proposed site assessment. All work will be performed under the supervision of a California- professional geologist and/or professional civil engineer. t.. Xinogen- A 5910 Rice Creek Parkway Suite 100 St. Paul, MN 55126 USA Phone: +1 651.639.9449 / USA Toll Free: 800.477.7411 Fax: +1 651.639.9473 www.deltaeny.com Mr. Craig Perkins Cityof Bakersfield Fire Department, Environmental Services September 17, 2009 Page 2 Background Site Description The subject site is currently an active Shell branded service station located on the northeast corner of the intersection of Gosford Road and White Lane in Bakersfield, California (Figure 1). The site is located in a commercial area of Bakersfield. The service station consists of three 10,000 - gallon and one 12,000- gallon gasoline underground storage tanks (USTs), two dispenser islands each equipped with two multi - product dispenser pumps, a carwash, and a station building (Figure 2). Previous Site Investigations and Environmental Activities Previous environmental activities at the site are summarized in the following table. Historical sampling locations are shown on Figure 2. SUMMARY. Date. Activity / . - No. of Borings / Report Consultant Coinnients .: Method Samples Date Phase II Environmental 6 Soil Borings Pacific Petroleum hydrocarbons 1 /00 BB -1 through Unknown Environmental detected in soil (BB -1, BB -2SiteBB -6 Group (PEG) and BB -6) Assessment Total Petroleum Hydrocarbons as gasoline (TPH -g) and Total8SoilSamplesin Petroleum Hydrocarbons as Soil Sampling the Former Diesel (TPH -d) detected withDispenserAreaIT during SB989 maximum concentrations of 10 7/01 and 12 Soil Unknown Corporation Upgrade milligrams per kilogram Samples in the IT) Activities mg/kg) and 210 mg/kg, Former Piping respectively. Maximum methylArea tert-butyl ether (MTBE) detected at 13 mg/kg. TPH -g detected at a maximum Over- 8 Soil Samples in concentration of 7.9 mg/kg. 7/01 Excavation Over - Excavation Unknown IT Maximum MTBE detected at Activities Area 16 mg/kg. Fifty cubic yards of soil removed. Continued) Mr. Craig Perkins City of Bakersfield Fire Department, Environmental Services September 17, 2009 Page 3 SUMMARY (continued) Activity / No. of Borings / ReportDate Consultant Comments Method Samples Date Maximum TPH -g detected at Site 6 soil borings to WGR 15 mg/kg, maximum TPH -d 6/03 Assessment maximum 65 feet bgs (BB -7 7/21/02 Southwest, detected at 4.6 mg/kg, and Activities through BB -12) Inc. (WGR) maximum MTBE detected at 16 mg/kg Maximum MTBE and tert- 8 soil borings to Site butyl alcohol (TBA) maximum feet5/03 Assessment 6/16/03 WGR concentrations in soil were 47 1 3bgs (BB -1Activities mg/kg and 16 mg/kg, through 1313-20) respectively All wells constructed with 2- Soil Vapor 5 dual- nested inch Schedule 40 PVC with 0.020 -inch slotted screen. Extraction SVE wells9/03 10/27/03 WGR Maximum MTBE and TBASVE) Well VEW -1 through concentrations in soil were 85 Installation VEW -5) mg/kg and 29 mg/kg, respectively Site tested to obtain data on vapor extraction parameters for use to design an SVE remediation system. Radius of influence (ROI) up to 25 feet for wells screened in the 12/03 SVE Pilot Test 2/9/04 DELTA shallow zone and 33 feet for wells screened in the deep zone. TPH -g mass removal rates estimated at 53.9 pounds per day (lbs /day) and MTBE mass removal rates estimated at 37.5 lbs /day Continued) Mr. Craig Perkins City of Bakersfield Fire Department, Environmental Services September 17, 2009 Page 4 SUMMARY (continued) Activity / No. of Borings / Report Date Consultant Comments Method Samples, Date Update to Submitted revised SVE test Results of calculations, which resulted in 4104 4115/04 DELTA SVE Pilot increased values for flow and Tests mass removal rate Proposed natural attenuation with long term monitoringCorrective 11/04 Action Plan 11/11/04 DELTA MNA) as the remedial approach to address residual RAP) hydrocarbons in vadose zone soils Confirmation Documented verbal approval of Verbal of RAP by the City of1105Approval: 1/24/05 DELTA Bakersfield Fire DepartmentRemedial CBFD) Action Plan Described proposed scope ofPermission work for vapor monitoring, Discharge Soil which includes the release of 4/05 Vapor from 4/4/05 DELTA soil vapors into theOnsiteWells atmosphere. Requested into the permission to discharge soil Atmosphere vapors into the atmosphere. Submitted quarterly updates 1/04— Quarterly including soil vapor 04/08 Updates Various DELTA monitoring data to monitor natural attenuation parameters Low Risk Site 5/08 Closure 5/12108 DELTA Requested Low Risk Closure of the Site Request 10/08 Agency Letter 10/29/08 DELTA Low Risk Closure Denied; SBCFD) Active Remediation Required Continued) Mr. Craig Perkins City of Bakersfield Fire Department, Environmental Services September 17, 2009 Page 5 SUMMARY'(continued) Response to Agency LetterResponseto 03/09 Agency Letter 03/6/09 DELTA providing additional of 10/29/08 information in support of case closure. Meeting with SBCFD, SHELL, and DELTA Meeting with regarding challenges to case05/09 05/08/09 DELTA SBCFD closure. SBCFD request a workplan for soil confirmation borings. Workplan for Proposed three Workplan proposed soil Soil06/09 soil confirmation 06/19/09 DELTA borings as locations discussed Confirmation Borings borings with SBCFD on 05/08/09 Requested four Requested two proposed soil Agency Letter08/09 soil confirmation 08/03/09 DELTA boring relocated and adding aSBCFD) borings fourth soil boring Addendum to Per telephone conversations Workplan for Proposed three between DELTA and SBCFD 09/09 Soil soil confirmation 09/10/09 DELTA addendum addressed relocation Confirmation borings of two soil borings, and no Borings requirement for a fourth boring Requested Revised Workplan 09/09 Agency e-mail 09/14/09 DELTA to incorporate Addendum in one document. Regional Geology and Hydrogeology The geologic conditions in the site vicinity are characterized from alluvial deposits, underlain by marine and non - marine sedimentary units, metamorphic rocks and crystalline basement material. Surface and near - surface conditions as designated by the U.S. Geological Survey are older alluvium, deposited in northwest- dipping alluvial fans resulting from outwash from the Sierra Nevada mountain range to the east. This alluvium is composed primarily of poorly graded and unconsolidated sands, sandy gravels and occasional discontinuous lenticular bodies of sandy clay and silt. Regionally, the surface of these old alluvial fans is undulatory, with a distinct dip toward the Kern River to the northwest of the site. The site itself is located along one of the crests of the alluvial fan surface ripples" at an elevation of approximately 363 feet above mean sea level (amsl). The total thickness of the alluvial Mr. Craig Perkins City ofBakersfield Fire Department, Environmental Services September 17, 2009 Page 6 fan deposits is estimated to range from approximately 600 feet west of the site to over 4,000 feet near the Sierra Nevada Mountains. The site lies within the Edison hydrogeologic sub -area of the Edison Maricopa area. Uppermost groundwater within this area occurs within the old alluvial fan deposits. In the site vicinity, deeper aquifers of limited areal extent are present in the consolidated non - marine sedimentary units and within fracture zones of the crystalline basement rock. The most prominent subsurface features controlling the groundwater flow direction are the groundwater barriers formed by the northwest to southwest trending Edison Fault and subparallel splays of this fault, located south and north of the site, respectively (WGR, 2003b). Depth to water in the vicinity of the subject site was approximately 140 feet below ground surface (bgs) in February 2009, according to California Water Service records. Site Specific Geology and Hydrogeology The soils encountered at the site during vapor extraction well installation activities conducted in September 2003 consisted primarily of fine- grained sand to the total depth explored of approximately 85 feet below ground surface bgs). A sandy to silty clay layer was encountered above approximately 12 feet bgs. Well Receptor Information The nearest surface water body is the Arvin Edison Canal, which is field- verified to be approximately 790 feet east of the site. The Buena Vista Lake Bed is located approximately 1,020 feet northeast of the site. The nearest well CBK 14) is approximately 3,800 feet southwest of the site; it has been measured from 01/1989 through 02/2009 and has an average groundwater elevation of 179 feet below ground surface (bgs). Well CBK 16 is located approximately 4,000 feet south of the site; it has been measured from 04/1989 through 02/2009 and has an average groundwater elevation of 185 feet bgs. Well CBK 30 is located 4,200 feet southeast of the site; it has been measured from 05/1995 through 02/2009 and has an average groundwater elevation of 191 feet bgs. Sensitive Receptors The site is located in a primarily commercial area with some residential areas nearby. According to the sensitive receptor survey performed by DELTA in 2005, a day care center and a school are located within a half -mile radius from the site. Cindy Bear Day Care is field- verified to be 1,926 feet northeast of the site, and Tevis Junior High School is field- verified to be 2,003 feet west of the site. On June 10, 2009, DELTA office verified the location of Tevis Junior High School, but was unable to office verify the location of Cindy Bear Day Care. The location of Cindy Bear Day Care will be field verified during field activities proposed in the workplan and addendum. Proposed Scope of Work DELTA previously proposed to conduct confirmation soil sampling to evaluate the potential for remaining vadose zone impacts by advancing three confirmation soil borings (CB -1, CB -2, and CB -3) to approximately 100 feet bgs or until refusal is encountered utilizing a truck - mounted drill -rig equipped with hollow -stem auger. Mr. Craig Perkins City of Bakersfield Fire Department, Environmental Services September 17, 2009 Page 7 The three proposed soil boring locations, (CB -1, CB -2, and CB -3), were chosen based on the May 8, 2009 meeting with the City of Bakersfield Fire Department, SHELL, and DELTA. Confirmation boring CB -1 is proposed in the vicinity of VEW -5A, VEW -5, BB -9, BB -18, and BP -3 and is approximately 15 feet northwest of the existing tank pit. Boring CB -2 is proposed approximately 50 feet southwest of the existing tank pit. Boring CB -3 is proposed approximately 30 feet south by southeast of the existing tank pit. As a result of a telephone and e-mail correspondence between Mr. Craig Perkins of the CBFD and Mr. Philip Gilchrist of DELTA on September 4, 2009 and September 9, 2009 respectively, DELTA proposes to relocate two of the originally proposed confirmation soil borings, CB -2 and CB -3. The alternative location for confirmation boring CB -2 is proposed in the area of vapor wells VEW -lA and VEW -113, approximately 20 feet north of the former proposed location. The alternative location for confirmation boring CB -3 is proposed approximately 18 feet northwest of the former proposed location. The proposed location of confirmation boring CB -1 will not change. The former and current proposed locations for these confirmation borings are shown on Figure 2. In the August 3, 2009 CBFD correspondence, the CBFD also recommended adding a fourth confirmation soil boring in the vicinity of vapor extraction wells VEW -2A and VEW -213. Subsequent to telephone conversations between Mr. Perkins and Mr. Gilchrist, the alternative proposed locations of confirmation borings CB -2 and CB -3 appear to address the concerns that the additional confirmation boring would have addressed, and therefore the fourth boring will not be required at this time. Pre -Drill Activities Upon approval of the work plan DELTA will visit the site and vicinity prior to drilling to clearly identify and mark the proposed drilling locations. DELTA will then supervise a geophysical contractor who will perform a geophysical survey; contact Underground Services Alert a minimum of 48 -hours prior to drilling; arrange the drilling schedule and coordinate with a drilling contractor who will mobilize drilling equipment and materials. A site - specific health and safety plan will be prepared by DELTA and followed during field activities. Notifications regarding the field activities will be made in advance to the appropriate agencies and property owners. Drilling Activities Prior to drilling, each boring location will be cleared using air -knife equipment to a depth of approximately eight feet bgs. Soil samples will be collected at five foot sampling intervals, beginning at approximately 10 feet bgs, to a total depth of approximately 100 feet bgs or until practical refusal is encountered. Soil samples will be collected using a 2 -inch diameter California modified split -spoon sampler. At each sampling interval, the soil samples will be collected and logged using the Unified Soil Classification System and samples will be retrieved in 2 -inch diameter brass sleeves. The sleeves will be sealed at each end with TeflonTM lined plastic end caps and labeled in accordance with specified sampling procedures. The brass sleeves will be stored on ice for transport with the appropriate chain -of- custody documentation to a state - certified analytical laboratory. During sampling operations, all soil samples will be field screened for the presence of volatile organic compounds VOCs) by headspace analysis using a photo - ionization detector (PID) calibrated to 100 parts per million by volume of isobutylene. PID readings will be recorded on the boring logs Mr. Craig Perkins City ofBakersfield Fire Department, Environmental Services September 17, 2009 Page 8 Once each boring is completed it will be backfilled with bentonite grout and/or hydrated bentonite chips to approximately three feet bgs. The remaining space will be backfilled with compacted native soil, capped with asphalt patch, or concrete and matched to the existing surface. Equipment Decontamination All down -hole sampling equipment will be washed between samples in a non - phosphate detergent, and triple rinsed with distilled or deionized water. Disposal of Drill Cuttings and Rinseate Any excess soil cuttings and rinseate generated during drilling activities will be placed in Department of Transportation (DOT)- approved 55- gallon drums. The drums will be sealed and labeled in accordance with SHELL's protocols and each drum will be identified on a waste inventory form. The soil cuttings and water will be placed on the Shell service station property at the end of each workday, pending analytical results. Upon proper characterization, the drums will be transported, under appropriate manifests, by a state - licensed transporter. Laboratory Analyses Soil and groundwater samples will be submitted to a California certified hazardous waste analytical laboratory for chemical analyses. Selected soil samples will be analyzed for TPH -d by EPA method 801513; and for TPH -g benzene, toluene, ethylbenzene, and total xylenes (BTEX compounds); and fuel oxygenates (including MTBE, ETBE, DIPE, TBA, TAME and ethanol) by EPA Method 8260B. Data Analysis and Reporting Following completion of field activities and receipt of all analytical results, a confirmation report will be prepared summarizing the findings of the above described tasks, presenting conclusions and recommendations. In addition, the report will include a site location map, description of field activities conducted, tables summarizing laboratory analytical results, laboratory reports, and chain -of- custody documentation. The report will be submitted to the City of Bakersfield Fire Department within 90 days of receipt of the final analytical report. Concluding Remarks The recommendations contained in this work plan represent DELTA's professional opinions based upon the currently available information and are arrived at in accordance with currently acceptable professional standards. This work plan is based upon a specific scope of work negotiated with the City of Bakersfield Fire Department. The Contract between DELTA and its client outlines the scope of work, and only those tasks specifically authorized by that contract or outlined in this work plan will be performed. This work plan is intended only for the use of DELTA's Client and anyone else specifically listed on this report. DELTA will not and cannot be liable for unauthorized reliance by any other third party. Other than as contained in this paragraph, DELTA makes no express or implied warranty as to the contents of this work plan. Mr. Craig Perkins City of Bakersfield Fire Department,, Fnvironmental Services September 17, 2009 Page 9 If you have any questions regarding this site, please contact Mr. Phil Gilchrist (DELTA) at (626) 873 -2730 or Ms. Monica Ortega (DELTA) at (626) 873 -2728. The SHELL Project Manager is Ms. Andrea Wing, who can be reached at (714) 731 -1050. Sincerely, Delta Consultants 0LLCy9 9 h0`g a 111 o OF CAL \Fp P. Philip L. Gilchrist, R.E.A. 30044 Project Manager Registered Environmental Assessor cc: Ms. Andrea Wing, Shell Oil Products US Heng and Sing Chao, Properly Owners Attachments: Figures: Figure 1 — Site Location Map Scott Pearson, P.G. 6931 Unit:Manager Figure 2 — Site Map with Proposed Confirmation Boring Locations Appendix A — City of Bakersfield Fire Department Letter dated August 3, 2009 Figures a c 0 a vLn 0QO 2 W Y 4 e R i P) N W 0 E S LEGEND YEW -1A DUAL NESTED VAPOR HELL LOCATION AN DESIGNATION BB -TB HISTORICAL SOIL BORING LOCATION WGR SOUTHKST INC. 06/20/02 - 06/21/02) BB -I¢ HISTORICAL SOIL BORING LOCATION PAOFIC ENNRONUENTAL GROUP 01/19/00) D -1 O HISTORICAL 500. SAIAPLNG LOCATION IT CORPORAnON 07/05/01 R 07/17/01) BB -130 SOE BORING LOCATION AND DESIGNATION WGR SOUTHWEST WC.) CB-3X FORMER PROPOSED CCNFRYATION BORINGLOCATION CB -3 + CURRENT PROPOSED CONFNYAnON BORING LOCATION MEL-^ CONsuL-r w ra SHELL OIL PRODUCTS US SHELL SERVICE STATION BAKERSFIELD, CALIFORNIA FIGURE 2 SITE MAP WITH PROPOSED AND HISTORICAL LOCATIONS 4050 GOSFORD ROAD BAKERSFIELD, CALIFORNIA Appendix A City of Bakersfield Fire Department Letter dated August 3, 2009 PE AFUItTM Ahmodd Ronald J. Froze Fire Chief Gary Hutton i Tyler Hartley j Douglas Greener Deputy Chiefs HOWARD H. WINES, III DIRECTOR PREVENTION SERVICES 1501 TYuxwn Ave., I' Floor Bakersfield, CA 93301 ! VOICE: (661) 326 -3979 FAX: (661) 852 -2171 Pe AUG 1 August 3, 2009 Ms. Andrea Wing Shell Oil Production US 20945 S. Willington Carson, CA 90810 Re: Work Plan for Soil Conformation Borings at the Shell Station 4050 Gosford Road, Bakersfield, Ca. Dear Ms. Wing, I have reviewed the work plan submitted by Delta Consultants for the Shell Station located 4050 Gosford Road, Bakersfield Ca. I would like to see some changes in the location of the borings including the addition of one more boring (CB -4). First, move CB-2 closer to VEW 1A and 1B, and add CB-4 (new) in the vicinity of VEW 2A and 213 so we could capture a better representative sample in the heaviest contaminated area. Second, regarding the sensitive receptor section of your work plan, these schools and care centers do not exist in the area. Please make the appropriate adjustments and resubmit. Please resubmit a correction action plan to this office within 30 days from receipt this letter. The work plan should follow the guidelines found in: Appendix A: Reports, Tri- Regional Board Staff Recommendations for Preliminary Investigation and Evaluations of Underground Tank Sites: 16 April 2004. If you have any additional questions, please call me at (661) 326 -3684. Sincerely, Craig Perkins REA Hazardous Materials Specialist cc: Mr. Philip L. Gilchrist Delta Environmental GT. U REA 1 -08330 E*MS- /o FIRE ARTM r September 23, 2009 Ms. Andrea Wing Shell Oil Production US 20945 S. Willington Carson, CA 90810 Ronald J. Fraze Fire Chief Re: Work Plan for Soil Conformation Borings at the Shell Station 4050 Gosford Road, Bakersfield, Ca. Gary Hutton Tyler Hartley Douglas Greener Dear Ms. Wing, Deputy Chiefs This office has reviewed the work plan revisions submitted by Delta Consultants for the Shell Station located 4050 Gosford Road, Bakersfield Ca. dated September 17, 2009. At this time we are in concurrence with the alterations of the three soil boring locations as indicated on the revised figure of the work plan. However, anyHOWARDH. WINES, III indication of MTBE within the soil samples of those borings will require DIRECTOR concurrence with the California Regional Water Quality Control Board PREVENTION SERVICES i prior to closure of this site. 1501 Truxtun Ave., V Floor If you have any additional questions, please call me at 661) 326 -3684. Bakersfield, CA 93301 VOICE: (661) 326 -3979 i t y O n vi N S. PER,,v, FAX: (661) 852 -2171 tr l Sincerely, REA i - 0833'm 4 . s Craig Perkins REAires: u r Hazardous Materials Specialist° ---- cc: Mr. Philip L. Gilchrist Delta Environmental B E; R S F I RE ARTM 4W Ronald I Fraze Fire Chief Gary Hutton Tyler Hartley Douglas Greener Deputy Chiefs T HOWARD H. WINES, III DIRECTOR PREVENTION SERVICES 1501 Truxtun Ave., I" Floor Bakersfield, CA 93301 VOICE: (661) 326 -3979 FAX: (661) 852 -2171 August 3, 2009 Ms. Andrea Wing Shell Oil Production US 20945 S. Willington Carson, CA 90810 Re:; Work Plan for Soil Conformation Borings at the Shell Station 4050 Gosford Road, Bakersfield, Ca. Dear Ms. Wing, I have reviewed the work plan submitted by Delta Consultants for the Shell Station located 4050 Gosford Road, Bakersfield Ca. I would like to see some changes in the location of the borings including the addition of one more boring (CB -4). First, move CB -2 closer to VEW 1A and 1B, and add CB-4 (new) in the vicinity of VEW 2A and 2B so we could capture a better representative sample in the heaviest contaminated area. Second, regarding the sensitive receptor section of your work plan, these schools and care centers do not exist in the area. Please make the appropriate adjustments and resubmit. Please resubmit a correction action plan to this office within 30 days from receipt this letter. The work plan should follow the guidelines found in: Appendix A; Reports, Tri- Regional Board Staff Recommendations for Preliminary Investigation and Evaluations of Underground Tank Sites: 16 April 2004. If you have any additional questions, please call me at (661) 326 -3684. Sincerely, " v ornr:ie,7 Z. PEq 2 Craig Perkins REA Hazardous Materials Specialist REA 1 -08330 6cpires'S / o cc: Mr. Philip L. Gilchrist Delta Environmental,j, a cD0 0 a UN i r 4 C R a IAANDT'P) WFBTE LANE M. FC10CN11 4!/ IIIOIUNO10ie6T tleaL090.J1 lGRtmC 10b7QWWfEO@4pb0INNBWCCA. f i O RI N Y O E 5 WEW-IA S DUAL NESTED VAPOR 11ET.LLOCATIONANDESIGNATION BB-T HISTORICAL 500. BORING LOCATION WW SOUTHWEST INC. 08/20 /0]-0E /21/02) HISTORICAL SOIL BORING LOCATION PAOTTC ENVVI I ENTAL GROUP 01/19/00) D -1 o HISTORCAL SOIL SANPUNG LOCATION IT CORPORATION 07/03/01 Q 07/I7/01) 88-100 SOL BORING LOCATION AND DESIGNATION WGR SOUTHWEST INC.) CS-) X PROPOSED CONF"ATIOi BORING LOCATION R fit) 1 O P1eW IPCtA T10 1$, ' EiONSULTANTs SHELL OIL PRODUCTS US SHELL SERNCE STATION BAKERSPIELD, CALIFORNIA FIGURE 2 SITE MAP WITH PROPOSED AND HISTORICAL LOCATIONS 4050 GOSFORD ROAD aA)CERSFIELD, CALIFORNIA