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Phase H Environmental Site Assessment 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 Sequoia Analytical Laboratory in Walnut Creek, California. Soil samples from the borings <br /> were analyzed for the following parameter: <br /> • Total recoverable petroleum hydrocarbons (TRPH) by EPA Method 418.1. <br /> Groundwater grab samples were analyzed for the following parameters: <br /> • TRPH by EPA Method 418.1. <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, <br /> such as oils) by EPA Method 8015 modified (Cal-DHS). <br /> • Volatile organic compounds (VOCs) by EPA Method 8260. <br /> • Persistent organochlorine pesticides by USEPA Method 8081, and chlorinated herbicides by <br /> USEPA Method 8151. <br /> Composite surficial soil samples were analyzed for the following parameters: <br /> • Persistent organochlorine pesticides by USEPA Method 8081, and chlorinated herbicides by <br /> USEPA Method 8151. <br /> A copy of the analytical report is included in Appendix B. <br /> 3.3 FIELD OBSERVATIONS <br /> The soils observed at three boring locations consist primarily of clayey to fine sandy silt of low <br /> to moderate plasticity, silty clay of moderate to high plasticity, and scattered lenses of silty fine <br /> sand. The upper approximately 2.5 feet is generally dark brown in color, changing to yellowish <br /> brown with depth. Soil with patchy, darker coloration was observed below approximately 13 feet <br /> bgs in boring S13-3. Consistency of the soils ranges from stiff to very stiff. No significant <br /> staining or odors were observed in any of the soil. <br /> Groundwater was encountered below approximate depths ranging from 12.5 to 14 feet bgs, <br /> occurring in sandy silt found below those depths in all three borings. Shallower soils ranged from <br /> slightly moist 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. Only one sample contained any <br /> S:\whc\wp\sharedl\projects\homedepo\tracyph2.doc 3-3 July 1999 <br />