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GRANITE CONSTRUCTION 2098357633 06124/02 01:09pm P. 005 KLEINFELDER workplan to include comments by PHS/EHD in a document titled "Revised Workplan/Cost Estimate, Limited Soil Sampling and Analyses, Bunt Material Stockpile, Granite Construction, Tracy Facility, Tracy, California", dated June 28, 2001. The following is Kleinfelder's findings based on our scope of work to address the county's concerns. 2.0 FIELD ACTIVITIES On July 26, 2001, Mr. Lou Smith, Kleinfelder Staff Geologist, collected eight discrete samples from two burn material stockpiles with an estimated volume of 75-cubic yards. The stockpiles are located on leased property adjacent and southwest of the California Aqueduct and the Granite Tracy facility. The leased property is bordered by Interstate 580, the California Aqueduct, Tracy Boulevard and Corral Hollow Road, in Tracy, California. The stockpiles were comprised of mostly glass(estimated 75% glass), and sediment(25 %)with some wood and metal debris. The glass was both broken and melted and was noted to be several different colors including blue, green and yellow. Clear bottles were also noted. The eight discrete soil samples were collected from approximately equal volumes of the two stockpiles at depths ranging from one to two feet below the surface or sides of the stockpile. The samples were obtained in a 2-inch diameter by 6-inch long stainless steel tube. The stainless steel tube was then sealed with Teflon° sheeting and plastic end caps. The samples were labeled, and placed in an iced cooler pending transportation to the analytical laboratory under chain of custody protocols. The sampling equipment and tubes were decontaminated between sample locations with a laboratory-grade detergent/water wash and distilled water rinse. The samples were transported under chain-of-custody control to Sequoia Analytical of Sacramento, California (Sequoia) for chemical analysis. Sequoia is certified by the California Department of Health Services to perform the requested analyses. 3.0 LABORATORY ANALYSIS The eight discrete soil samples were composited by Sequoia into two four-point composite sample and analyzed for the following: • pH by EPA Method 9040 • Total Threshold Limit Concentrations (TTLCs) of California Assessment Manual (CAM- 17) metals by EPA Methods • Benzene,Toluene, Ethylbenzene,Total Xylenes by EPA Method 8020 [BTEX] • Total Extractable Petroleum Hydrocarbons as referenced to Diesel [TPH-D] by EPA Method 8015M/3015 • Total Petroleum Hydrocarbons as referenced to Gasoline [TPH-G] by EPA Method 8015M • Semi-Volatile Organics by EPA Method 8270 20-1108-33.001/2011 RI 188 Page 2 of 7 0 2001,Kleinfelder,Inc. October 17,2001