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Limited Environmental Investigation May 21, 1990 <br /> Proposed Unocal Station, Stockton, California AGS 30010-1 <br /> LABORATORY ANALYSES AND RESULTS <br /> Applied GeoSystems submitted the soil sample collected from 50 feet in borings B-1 <br /> through B-3 and 35 feet from boring B-4 for laboratory analysis. The soil sample selection <br /> criteria requested by Unocal was to analyze the sample from each boring with the highest <br /> PID reading or the bottom sample if no hydrocarbon vapors were detected with the PID <br /> and ground water was not encountered. <br /> The soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and <br /> as diesel (TPHd) using modified Environmental Protection Agency (EPA) Method 8015, <br /> benzene, toluene, ethylbenzene, and total xylene isomers (BTEX) using modified EPA <br /> Method 8020, volatile organic compounds (VOC's) using EPA Method 8010 and <br /> polychlorinated biphenyls (PCB's) and pesticides using EPA Method 608. Soil samples were <br /> also analyzed for total concentrations of the heavy metals cadmium, chromium, lead, and <br /> zinc using EPA Method 6010. The soil sample from boring B-1 was analyzed for total oil <br /> and grease (TOG) using EPA approved standard method 503e. J ? <br /> The laboratory analyses were performed by Applied Analytical Environmental Laboratories <br /> in Fremont, California (Hazardous Waste Testing Laboratory Certificate No. 153), and <br /> Anametrix Inc. in San Jose, California(Hazardous Waste Testing Laboratory Certificate No. <br /> 151). Copies of laboratory analytical reports are in Appendix A. <br /> 9 <br /> AppAVO' GeoSystems <br />