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Geological Teclnics Inc. Page 3 i soil &Groundwater Investigation Report Marci Property Project No. 701.2 4 July 24,2002 2.1.2. Laboratory Analysis Based on field screening observations, up to three soil samples from each borehole were submitted to Sherwood Laboratories of Hilmar (State Certified Laboratory #1400) for the following analyses: • Benzene, Toluene, Ethylbenzene and Xylene (BTEX) by EPA method 8020 • Gasoline range petroleum hydrocarbons (TPH-G) by EPA method 5030/8015(m) } j Diesel range petroleum hydrocarbons (TPH-D) by EPA method 3540/8015(in) I The detection limits for these compounds are listed in Table 1 of Appendix A. A Chain of Custody was completed for all samples collected and tracked to ensure sample integrity. -Vol As required under AB2886, the laboratory data were submitted electronically to GeoTracker on July I8, 2002 (confinnation#s 73 901 23 1 88 2.2 Monitoring Well Installation The monitoring wells were constructed using 2-inch diameter PVC casing with flush threads. The table below shows the construction details. The filter packs were surged during placement to insure maximum filter pack density. Well No. Dia./TD Screen Slot Sand Pack Trans, Grout Seal Seal l MW-7 2"/70' 55-70' 0.010" #2/12 sand 53-70' 51-53' 0-51' MW-8 2"/70' 55-70' 0.010" #2/12 sand 53-70'. ` 51-53' 0-51' MW-104 2"/95' 90-95' 0.010" #2/12 sand 88-95' 85-88' 0-85' MW-106 2"/95' 90-95' 0.010" #2/12 sand 88-95' 85-88' 0-85' E A surface seal was achieved by pumping a neat cement grout via a tremmie tube (augmented with <4% ben.tonite) to the surface. The wells were secured with locking i watertight caps encased in flush mounted traffic-rated well boxes. 3.0 WELL DEVELOPMENT & SAMPLING The wells were developed acid subsequently sampled on June 7, 2002. This work will be detailed in GTI's forthcoming "2"" Quarter 2002 Groundwater Monitoring Report" to be submitted in August 2002. 4.0 RESULTS OF INVESTIGATION The analytical results and field observations are discussed below. Summary analytical data are included in Table 1 in Appendix A. Boring logs are included in Appendix B. A site snap -- with soil boring locations, and geologic cross sections are included as Figures 2 through 6.