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Additional Phase I and Phase HEnvironmental Site Assessments Tracy, California <br /> Home Depot, U.S.A. Inc. <br /> 3.2 LABORATORY ANALYSIS <br /> All samples were preserved on ice and transported with proper chain-of-custody documentation <br /> to McCampbell Analytical Laboratory in Pacheco, California. Soil samples from the borings <br /> were analyzed for the following parameters: <br /> • Total petroleum hydrocarbons in the gasoline (TPG-g) and diesel (TPH-d) carbon chain <br /> ranges, and higher carbon chain range petroleum hydrocarbons ("heavier" hydrocarbons, such <br /> as oils) by EPA Method 8015 modified (Cal-DHS). <br /> Groundwater grab samples were analyzed for the following parameters: <br /> • TPG-g and TPH-d carbon chain ranges, and higher carbon chain range petroleum <br /> hydrocarbons ("heavier" hydrocarbons, such as oils) by EPA Method 8015 modified (Cal- <br /> DHS). <br /> • Volatile organic compounds (VOCs) by EPA Method 8260. <br /> Composite surface soil samples were analyzed for the following parameters: <br /> • Persistent organochlorine pesticides by USEPA Method 8080, organophosphate pesticides by <br /> USEPA Method 8140, and chlorinated herbicides by USEPA Method 8151. <br /> Copies of the Certified Analytical Reports are included in Appendix B. <br /> 3.3 FIELD OBSERVATIONS <br /> The soils observed at four boring locations consist primarily of clayey to fine sandy silt of low to <br /> moderate plasticity, silty clay of moderate to high plasticity, and scattered lenses of silty fine <br /> sand. The upper approximately 2 feet is generally dark brown in color, changing to yellowish <br /> brown with depth. A layer of well sorted, fine to medium grained sand was observed between <br /> 7.5 and 12 feet bgs in SB-2. No significant staining or odors were observed in any of the soil. <br /> Boring logs are presented in Appendix C. <br /> Groundwater was encountered below approximately 8 feet bgs, occurring in sand and silt layers <br /> found below those depths in all four borings. The water content of shallower soils ranged from <br /> damp to moist. <br /> 3.4 ANALYTICAL RESULTS <br /> The analytical results for soils (soil boring and composite area samples) are listed in Table 1. The <br /> results for the groundwater grab samples are listed in Table 2. Copies of Certified Analytical <br /> Reports are included in Appendix B. Analyses of soil and groundwater samples from the four <br /> Geoprobe borings for TPH-g, TPH-d and VOCs yielded non-detect results. Analyses for <br /> G:home\clarkeb\projects\homedepo\tracy\addp I&2.doc 3-3 October 2000 <br />