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Home My WebLink AboutUNDERGROUND TANK (4) ~~.~~-~ ~---- <<f. ~;- a California Regional Water Quality Control Board Central Valley Region Robert Schneider, Chair Fresno Branch Office Internet Address: http://www.swrcb.ca.gov/-rwqcb5 1685 E Street, Fresno, California 93706·2020 Phone (559) 445-5116' FAX (559) 445·5910 , Arnold Schwarzenegger Governor Terry Tamminen Secretary for Environmer¡tal Protection 1 April 2004 Regional Board Case No. 5T15000808 , -- -- -Mr.-FrankH. Hobin 8908 Versailles Drive Bakersfield, California 93311 ----~. - UNDERGROUND TANK RELEASE, CAR WASH OF AMERICA (FORMER NIAGARA CAR WASH), 1701 STINE ROAD, BAKERSFIELD, KERN COUNTY You submitted Third Quarter 2003 Groundwater Monitoring Report, Fourth Quarter 2003 Groundwater Monitoring Report, Additional Groundwater Characterization Report of Findings and Remediation Status Report (Third and Fourth Quarter Report) dated 1 Febmary 2004 and First Quarter 2004 Groundwater Report and Remediation Status Report (First Quarter Report) dated 3 March 2004. E2C Remediation, LLC, Bakersfield (E2C) prepared the reports. We request that you continue quarterly groundwater monitoring. Continue analysis for the lead scavengers during the second and third quarters of 2004. Continue "full scan" EP A Method 8260 analysis during the second and third quarters of 2004. Submit inorganic analytical data not included in the Third and Fourth Quarter Report and the second quarter 2004 monitoring data. We dö not currently request a work plan for additional monitoring well installations. Submit a work plan for investigation of impacted soils beneath the fuel dispenser canopy. We reiterate our request that you expedite soil remediation to minimize potential impacts to a nearby municipal well. Summaries of the Third and Fourth Quarter and First Quarter Reports and our comments follow. Third and Fourth Quarter Report Summary Monitoring Well Installation E2C installed monitoring well MW-2 in an up gradient position between the USTs and the dispenser island canopy and monitoring well MW -3 in a downgradient position southeast of existing well MW-l on 1 to 2 October 2003. MW-2 and MW-3 are standard-constmction four-inch diameter wells screened from approximately 160 to 180 feet below ground surface (bgs). Groundwater was encountered at 168 feet bgs during well constmction. Soil samples were collected in MW-2 at 20-foot intervals to 120 feet bgs, and then at 5-foot intervals to maximum depth. Soil samples were collected from MW-3 at 5-foot intervals to maximum depth. Four soil samples from MW-2 and three soil samples from MW-3 were analyzed in the laboratory for total petroleum hydrocarbons as gasoline and diesel (TPH-g and TPH-d) by EPA Method 8015M, benzene, California Environmental Protection Agency #t> ~J Recycled Paper 7""---- :A/ ~ Mr. Prank H. Hobin - 2 - 1 April 2004 <J .... toluene, ethylbenzene, and xylenes (BTEX) and the fuel oxygenates methyl tertiary butyl ether (MTBE), ethyl tertiary butyl ether (ETBE), di-isopropyl ether (DIPE), tertiary amyl methyl ether (TAME), and tertiary butyl alcohol (TBA) and the lead scavengers 1,2-dichloroethane (1,2-DCA) and 1,2- dibromoethane (EDB) by EP A Method 8260. The analyses were used to verify the vertical and lateral extent of impacted soils. Xylenes were detected in MW-2 at 125 feet bgs. No other analytes were detected in the samples. Third and Fourth Quarter 2004 Monitoring Events E2C conducted the third and fourth quarter 2003 groundwater monitoring event on 30 June and 10 October 2003, respectively. Depth to water in MW -1 during the third quarter event was measured at 165.00 feet below the top of the well casing (below TOC). Depth to water in MW-l through MW-3 -'--during tIïefourth quarter event ranged-trom 167.58 to 170.07-feet below TOe. E2C detèrmined groundwater flow direction to be toward the southwest and southeast during the third and fourth quarter events, respectively. --=-..-.- .~ - . Groundwater samples were analyzed for TPH-g by EPA Method 8015M, BTEX, the fuel oxygenates MTBE, TBA, DIPE, ETBE, TAME, and the lead scavengers 1,2-dichloroethane (l,2-DCA), and 1,2- dibromoethane (EDB). During the third quarter, the samples were also arialyzed for TPH-d by EPA Method 8015M. During the fourth quarter, the samples were also analyzed for volatile organic compounds by "full scan" EP A Method 8260B. TPH-g, BTEX, TAME, TBA, DIPE, ETBE, 1,2-DCA, and EDB were not detected during the third quarter. MTBE was detected in MW-l at 8 µg/L. TPH-d was detected at 64 µg/L. During the fourth quarter, TPH-g was detected at 60 and 80 µglL in MW-2 and MW-3, respectively. MTBE was detected at 20 and 150 µg/L in MW-2 and MW-3, respectively. Other analytes were not detected. E2C recommends that groundwater monitoring continue on a quarterly schedule. Samples should be analyzed for TPH-g, BTEX, MTBE, TBA, DIPE, ETBE, and TAME. Analysis for 1,2-DCA and EDB should continue for two additional quarters and should be discontinued if these analytes are not detected. '--., -First-0uafter~Report-S'ummarv-~ .- ---, ~--- - ---- ------ - ~-- . ---- E2C conducted the first quarter 2004 groundwater monitoring event on 22 January 2004. Depth to water in MW-l through MW-3 ranged from 165.00 to 167.41 feet below TOe. E2C determined groundwater flow direction to be toward the south-southeast. Groundwater samples were analyzed for TPH-g by EPA Method 8015M and volatile organic compounds by "full scan" EP A Method 8260B, and including BTEX, the fuel oxygenates MTBE, TBA, DIPE, ETBE, TAME, and the lead scavengers 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB). The samples were also analyzed for general minerals, nitrate, total Kjeldahl nitrogen (TKN), and dissolvèd lead. TPH-g, BTEX, TAME, TBA, DIPE, ETBE, 1,2-DCA, and EDB were not detected. MTBE was detected in MW-l, MW-2, and MW-3 at 2,6, and 14 µg/L, respectively. Dissolved lead was not detected. The volatile halocarbon tetrachloroethylene (PCE) was detected in samples from MW-2 and MW-3 at 1.5 and 1.7µglL, respectively. V:\UGT\Projects\JDW _tìles\2004 Correspondence\City of Bakersfield Cases\Niagara GW-SA 3-04,doc "!~ " Mr. Frank H. Hobin - 3 - 1 April 2004 E2C expects that soil vapor extraction (SYE) equipment will be delivered to the site during later March 2004. After set-up, the SVE equipment will be operated intermittently for 30 days to optimize system performance prior to the San Joaquin Valley Unified Air Control District's startup inspection. Full-time operation will commence after the inspection. E2C recommends that groundwater monitoring continue on a quarterly schedule and that samples be analyzed for TPH-g, BTEX, MTBE, TBA, DIPE, ETBE, and TAME. Analysis for 1,2-DCA and EDB should be discontinued if these ana1ytes are not detected during the next two monitoring events. Analysis for lead and general minerals, nitrate, and TKN should be discontinued. E2C concludes that the groundwater impact beneath the site is minimal, and that additional groundwater investigation to determine downgradient extent may not be necessary. E2C will evaluate future monitoring data to determine whether a workplan for additional downgradient monitoring well installations, if necessary. Comments Based on review of the above-summarized report, we have the following comments: Continue quarterly groundwater monitoring. Groundwater samples should be analyzed for TPH-g, BTEX, MTBE, TBA, DIPE, ETBE, and TAME. Continue analysis for 1,2-DCA and EDB during the second and third quarter 2004 monitoring events. The chlorinated solvent PCE was d~tected in groundwater samples from MW-2 and MW-3 during the first quarter 2004 monitoring event. We request that you further characterize groundwater quality and PCE concentrations by continuing to analyze by "full scan" EP A Method 8260 analysis during the second and third quarters of 2004. We anticipate that analysis frequency will be subsequently reduced. Analytical data included in the First Quarter Report indicates that the Method Reporting Limit (MRL) for dissolved lead is 50 µg/L using EPA Method 6010B. The MRL exceeds the California Department of Health Services Primary Drinl<:ing Water Maximum Contaminant Level (MCL) of 15 µg/L. We request that you continue to analyze for dissolved lead during the second and third quarters of 2004 using an MRL less than or equal to the MCL. Your laboratory may need to use a different analysis method to attain this MRL. ' . ,.' Section 4.3 of the Third and Fourth Quarter Report indicates that general minerals, nitrate, TKN and lead analyses were conducted during the fourth quarter monitoring event. Table 5 indicates that these analyses were conducted on samples collected on 31 July 2003. Laboratory analytical reports for these analyses were to be presented in Appendix H, which was not included. These analyses were not requested on Chain-of-Custody documentation included for the 30 June and 10 October 2003 monitoring events. We are uncertain whether an additional monitoring event was conducted on 31 July 2003. Please submit laboratory analytical reports any general minerals, nitrate, TKN, and lead analyses conducted during the third and fourth quarters by 3 May 2004. These analyses were conducted during the first quarter 2004. We request that you discontinue these analyses at this time. Submit the second quarter 2004 groundwater monitoring report by 3 May 2004. V:\U01ìProjectsVDW _files\2004 Correspondence\City of Bakersfield Cases\Niagara OW-SA 3·04.doc " \., Mr. Frank H. Hobin - 4- 1 April 2004 We do not request that you submit a work plan for additional monitoring well installations at this time. Our decision is based on both the low MTBE concentrations detected to date and access restrictions between the site and CWS well 158-01. Low concentrations of gasoline range petroleum hydrocarbons were detected beneath the margins of the fuel dispenser canopy to 40 feet bgs during previous site investigation. This data suggests that higher concentrations may be present beneath the canopy and dispensers. By our letters dated 26 August and 6 October 2003, we requested that you submit a work plan for additional investigation beneath the canopy. As of the date of this letter, we have not received the work plan, which is overdue. By our letter dated 26 August 2003, we approved expedited installation and operation of soil remediation by SVE to minimize potential impacts to CWSC well 158-01. We reguested that you heg~,-, , , -sVEopcråtlôï1 by ':rD~er 2ÔÕr\\T~~íte;at~ our re(i~iest. -W~ 'ü.l1d~~~d that S\Œ: equipment -will -- be delivered during late March and that remediation will begin within approximately two weeks thereafter. Contact us by 15 April 2004 to provide an update on remediation status. As of the date of this letter, we have not received electronic data deliverables for your site. Electronic submittals to Geotracker should include soil or groundwater sample analytical data (various file names), wellhead horizontal and vertical positioning data (GEO_XY and GEO_Z files), depth-to-water measurements (GEO_ WELL files), and site maps (GEO_MAP files). Please contact this office at least five days prior to fieldwork. If you have any questions regarding this correspondence, please contact me at (559) 445-5504. r 1* ¡dijliPr/ JOHN D. WHITING Engineering Geologist R.G. No. 5951 - ---- -~--~-- - - --.---=-------..-,-.- -" - .-.-~.;--...- -;; --=--- ~~------ - - .- c: Ms. Barbara Rempel, SWRCB, UST Cleanup Fund, Sacramento Mr. Howard Wines Ill, City of Bakersfield Fire Department, Bakersfield Mr. William Lawson, E2C Remediation, LLC, Bakersfield Ms. Tarrah Henrie, California Water Service Company, San Jose File; UST/Kern/Carwash of America!l70 I Stine Rd., Bakersfield/5T15000808 V:\UG1\ProjectsVDW _files\2004 COlTespondence\City of Bakersfield Cases\Niagara GW·SA 3-04.doc