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Home My WebLink About6801 Panama Lane - Soils Report - Winco Panama Ashe (3) 1 Terracon Consultants, Inc. 2817 McGaw Avenue Irvine, California 92614 P [949] 261 0051 F [949] 261 6110 terracon.com May 7, 2013 WinCo Foods, LLC 650 North Armstrong Place Boise, Idaho 83704 Attn: Mr. Ronald R. Schrieber P: 208.672.2087 E: Ronald.Schrieber@wincofoods.com Re: Geotechnical Addendum Letter Proposed WinCo Foods Store - Bakersfield Bakersfield, California Terracon Project No. 60125053 Dear Mr. Schrieber: At your request, we are providing the following letter which provides supplemental information to our geotechnical engineering report (Project No. 60125053, dated November 2, 2012). Terracon Consultants, Inc. (Terracon) has completed additional field exploration and laboratory testing services for the above referenced project. The objective of our additional services was to provide hydraulic conductivity values of the subsurface soils near the proposed infiltration basin, pavement recommendations for the widening of Panama Lane and Ashe Road, and slope stability analysis for the proposed infiltration basin. A total of six test borings/pits were advanced at the site on May 1, 2013. Because of soft and wet soils (from irrigation of the field) site access was limited. Two test borings were drilled to an approximate depth of 41½ feet below ground surface (bgs) near the proposed infiltration basin. Four test pits were excavated to an approximate depth of 2 feet bgs within the outline of the proposed street widening of Ashe Road and Panama Lane. The approximate locations of these explorations are shown on the attached Boring Location Plan, Exhibit 1. The test borings were advanced with a truck-mounted CME-55 drill rig utilizing 6-inch diameter hollow-stem auger. Continuous lithologic logs of the borings were recorded by the field representative during the drilling operations. At selected intervals, samples of the subsurface materials were taken by driving ring-barrel samplers. Bulk samples of subsurface materials were also obtained. Groundwater conditions were evaluated in the borings at the time of site exploration, but groundwater was not encountered within our borings. Geotechnical Addendum Letter Proposed WinCo Foods Store - Bakersfield ■ Bakersfield, California May 7, 2013 ■ Terracon Project No. 60125053 Responsive ■ Resourceful ■ Reliable 2 Permeability Testing: Three Constant-Head Pressure Permeability (ASTM D2434) tests were performed on selected soil samples. The tested soil samples were collected at depths of 6½ and 16½ feet from boring Perc-3, and at a depth of 11½ feet from boring Perc-4. The constant head permeability test results are included in the following table. The rates shown are measured rates and do not include a factor of safety. The civil designer should incorporate an appropriate factor of safety into their design. INFILTRATION TEST RESULTS Test Location Soil Classification Hydraulic Conductivity, cm/sec Perc-3 @ 6½’ Sandy Silty Clay 2.0 E-06 Perc-3 @ 16½’ Silty Sand 2.6 E-05 Perc-4 @ 11½’ Sandy Silty Clay 1.2 E-07 It is our understanding that the bottom of the proposed infiltration basin will be at a depth between 11 and 12 feet bgs. sandy silty clay soils extend to an approximate depth ranging between 10½ and 11½ feet bgs, and are underlain by silty sand and poorly graded sand soils. In the event the hydraulic conductivity values of the silty sand soils were utilized in the design of the infiltration basin, Terracon should be notified at the time of the construction of the infiltration basin to verify that silty sand soils are encountered at the bottom of the basin. The permeability tests were performed with clear water, whereas the storm water will likely not be clear, but may contain organics, fines, and grease/oil. The presence of these deleterious materials will tend to decrease the rate that water percolates from the infiltration systems. Design of the storm water infiltration systems should account for the presence of these materials and should incorporate structures/devices to remove these deleterious materials. We recommend that infiltration testing be performed after the bottom of the basin has been exposed to verify the design infiltration rates. It should be noted that siltation and vegetation growth along with other factors may affect the infiltration rates of on-site soils. The actual infiltration rate may vary from the values reported here. Pavement Recommendations: R-value laboratory testing was conducted on near surface soils collected from test pits S-1, S-2, and S-4. The R-Value of a combined sample consisting of silty sand soils collected from test pits S-1 and S-2 was found to be 66 and 56 by exudation and expansion pressures, respectively. The Geotechnical Addendum Letter Proposed WinCo Foods Store - Bakersfield ■ Bakersfield, California May 7, 2013 ■ Terracon Project No. 60125053 Responsive ■ Resourceful ■ Reliable 3 R-Value of a soil sample consisting of silty sand soils collected from test pit S-4 was found to be 60 and 62 by exudation and expansion pressures, respectively. A maximum design R-value of 50 was used to calculate the asphalt concrete pavement thickness sections. Subgrade soils beneath pavements should be prepared per our referenced geotechnical report. The following pavement sections should be considered minimums for the traffic indices assumed in the sections below. Recommended Pavement Section Thickness (inches)* TI=8.5 TI=9.0 TI=9.5 Option A 5” Asphaltic Concrete over 6” Class II Aggregate Base 5” Asphaltic Concrete over 7” Class II Aggregate Base 6” Asphaltic Concrete over 6” Class II Aggregate Base Option B 4½” Asphaltic Concrete over 7” Class II Aggregate Base 4½” Asphaltic Concrete over 8” Class II Aggregate Base 5” Asphaltic Concrete over 8” Class II Aggregate Base * All materials should meet the current CALTRANS Standard Specifications for Highway Construction. All pavements should be supported by a minimum of 10 inches of scarified, moisture conditioned, and compacted subgrade as recommended in the referenced report. These pavement sections are considered minimal sections based upon the expected traffic and the existing subgrade conditions. However, they are expected to function with periodic maintenance and overlays if good drainage is provided and maintained. Materials and construction of pavements for the project should be in accordance with the requirements and specifications of the State of California Department of Transportation, or other approved local governing specifications. Preventative maintenance should be planned and provided for through an on-going pavement management program in order to enhance future pavement performance. This consists of both localized maintenance (e.g. crack sealing and patching) and global maintenance (e.g. surface sealing). Preventative maintenance is usually the first priority when implementing a planned pavement maintenance program and provides the highest return on investment for pavements. Base course aggregate or pavement materials should not be placed when the surface is wet or unstable. Surface drainage should be provided away from the edge of paved areas to minimize lateral moisture transmission into the subgrade. Slope Stability: Based on a drawing provided by CTA, we understand the proposed detention pond will have permanent slopes with an inclination of 2H:1V (Horizontal:Vertical). The proposed 2H:1V slopes will be approximately 11.8 feet in height. Slope stability evaluations were performed on DIAGRAM IS FOR GENERAL LOCATION ONLY, AND IS NOT INTENDED FOR CONSTRUCTION PURPOSES. ProjectMngr:FHDesignedBy:AHCheckedBy:FHApprovedBy:FHFileName:BAKERSFIELD ProjectNo.Scale:Date:DrawnBy:ExhibitNo. BORING LOCATION DIAGRAM Proposed WinCo Foods StoreSWC of Panama Lane and Ashe RoadBakersfield, California2817 McGaw Avenue Irvine, California 92606 949-261-0051 Fax: 949-261-6110 601250531 05/07/2013FH1”≈ 280’ S-1 TEST PIT APPROXIMATE LOCATION (STREET WIDENING)LEGEND Perc-3 SOIL BORING APPROXIMATE LOCATIONPerc-4Perc-3 S-1S-2 S-3 S-4 Panama Lane Ashe Road 11.5 16.5 21.5 SANDY SILTY CLAY (CL-ML), dark brown, very stiff to hard SILTY SAND (SM), brown, medium dense POORLY GRADED SAND WITH SILT (SP-SM), light brown, medium dense POORLY GRADED SAND (SP), light brown, medium dense to dense 3-9-13 13-26-29 5-14-17 4-15-22 6-23-25 114 96 118 92 108 11 9 8 7 3 Latitude: 35.29376° Longitude: -119.08107° See Exhibit A-2 Hammer Type: AutomaticStratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13No free water observed WATER LEVEL OBSERVATIONS Page 1 of 2 Advancement Method: Hollow Stem Auger Drilling Abandonment Method: Borings backfilled with soil cuttings upon completion. 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Drill Rig: CME-75 Boring Started: 5/1/2013 BORING LOG NO. Perc-3 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Driller: Technicon Boring Completed: 5/1/2013 Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-2 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft) 5 10 15 20 DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 41.5 POORLY GRADED SAND (SP), light brown, medium dense to dense (continued) Boring Terminated at 41.5 Feet 8-20-29 9-16-19 3-16-22 6-29-31 104 92 98 102 3 3 4 2 Latitude: 35.29376° Longitude: -119.08107° See Exhibit A-2 Hammer Type: AutomaticStratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13No free water observed WATER LEVEL OBSERVATIONS Page 2 of 2 Advancement Method: Hollow Stem Auger Drilling Abandonment Method: Borings backfilled with soil cuttings upon completion. 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Drill Rig: CME-75 Boring Started: 5/1/2013 BORING LOG NO. Perc-3 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Driller: Technicon Boring Completed: 5/1/2013 Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-3 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft) 25 30 35 40 DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 10.5 21.5 SANDY SILTY CLAY (CL-ML), dark brown, very stiff to hard SILTY SAND (SM), brown to light brown, medium dense POORLY GRADED SAND (SP), light brown, medium dense to dense 12-17-20 11-21-23 6-15-18 6-11-11 6-19-23 107 122 86 111 107 8 6 4 6 3 Latitude: 35.29376° Longitude: -119.08107° See Exhibit A-2 Hammer Type: AutomaticStratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13No free water observed WATER LEVEL OBSERVATIONS Page 1 of 2 Advancement Method: Hollow Stem Auger Drilling Abandonment Method: Borings backfilled with soil cuttings upon completion. 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Drill Rig: CME-75 Boring Started: 5/1/2013 BORING LOG NO. Perc-4 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Driller: Technicon Boring Completed: 5/1/2013 Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-4 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft) 5 10 15 20 DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 41.5 POORLY GRADED SAND (SP), light brown, medium dense to dense (continued) Boring Terminated at 41.5 Feet 8-12-22 3-8-14 3-12-33 14-32-35 103 88 104 102 5 15 3 4 Latitude: 35.29376° Longitude: -119.08107° See Exhibit A-2 Hammer Type: AutomaticStratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13No free water observed WATER LEVEL OBSERVATIONS Page 2 of 2 Advancement Method: Hollow Stem Auger Drilling Abandonment Method: Borings backfilled with soil cuttings upon completion. 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Drill Rig: CME-75 Boring Started: 5/1/2013 BORING LOG NO. Perc-4 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Driller: Technicon Boring Completed: 5/1/2013 Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-5 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft) 25 30 35 40 DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 2.0 SILTY SAND (SM), trace gravel, light brown Test Pit Terminated at 2 Feet See Exhibit A-2 Stratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13WATER LEVEL OBSERVATIONS Page 1 of 1 Advancement Method: Abandonment Method: 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Excavator: Test Pit Started: 5/1/2013 TEST PIT LOG NO. S-1 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Operator: Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-6 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft)DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 2.0 SILTY SAND (SM), trace gravel, light brown Test Pit Terminated at 2 Feet See Exhibit A-2 Stratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13WATER LEVEL OBSERVATIONS Page 1 of 1 Advancement Method: Abandonment Method: 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Excavator: Test Pit Started: 5/1/2013 TEST PIT LOG NO. S-2 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Operator: Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-7 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft)DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 2.0 SILTY SAND (SM), trace gravel, light brown Test Pit Terminated at 2 Feet See Exhibit A-2 Stratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13WATER LEVEL OBSERVATIONS Page 1 of 1 Advancement Method: Abandonment Method: 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Excavator: Test Pit Started: 5/1/2013 TEST PIT LOG NO. S-3 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Operator: Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-8 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft)DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 2.0 SILTY SAND (SM), trace gravel, light brown Test Pit Terminated at 2 Feet See Exhibit A-2 Stratification lines are approximate. In-situ, the transition may be gradual. LOCATION DEPTH GRAPHIC LOG THIS BORING LOG IS NOT VALID IF SEPARATED FROM ORIGINAL REPORT. TERRACON SMART LOG-NO WELL BORING LOGS_WINCO FINAL.GPJ TERRACON2012.GDT 5/7/13WATER LEVEL OBSERVATIONS Page 1 of 1 Advancement Method: Abandonment Method: 2817 McGaw Avenue Irvine, California Notes: Project No.: 60125053 Excavator: Test Pit Started: 5/1/2013 TEST PIT LOG NO. S-4 WinCo Foods, LLCCLIENT: See Exhibit A-3 for description of field procedures. Operator: Exhibit: PROJECT: Proposed WinCo Store SITE: See Appendix B for description of laboratory procedures and additional data, (if any). See Appendix C for explanation of symbols and abbreviations. A-9 SW Corner of Panama Ln. and Ashe St. Bakersfield, California FIELD TESTRESULTS SAMPLE TYPEWATER LEVEL OBSERVATIONSDEPTH (ft)DRY UNIT WEIGHT (pcf) ATTERBERG LIMITS LL-PL-PI Percent FinesWATER CONTENT (%) 4.96 Bakersfield WinCoTerracon Project No. 601250535/7/2013 Description: Sandy Silty ClayWt: 120Cohesion: 2000Phi: 0 Description: Silty SandWt: 115Cohesion: 0Phi: 30 WaterDistance (feet) 0102030405060708090100110120130140150 Elevation (feet) 310320330340350360370380390400410 4.19 Bakersfield WinCoTerracon Project No. 601250535/7/2013 Description: Sandy Silty ClayWt: 120Cohesion: 2000Phi: 0 Description: Silty SandWt: 115Cohesion: 0Phi: 30 Distance (feet) 0102030405060708090100110120130140150 Elevation (feet) 310320330340350360370380390400410