ARCHIVED REPORTS LIMITED SOIL ASSESSMENT AND TEST PIT EXPLORATION

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0 ' 'q KLEINFELDER analyses. For details refer to attached Tables 2 and 3 for location and sample depths submitted for analyses. Soil samples were collected by hand augering to the desired sampling depth and by stainless slide hammering a 2-inch diameter' into the soil. The by 6-inch l� gIwere cleanedel ebetween locations stainless steel hand auger, sample sample tubes with a Liquinox® (laboratory-grade detergent) wash followed by a potable water and distilled water rinse. The stainless steel tubes used for collecting the samples were then sealed following collection of the samples with Teflon° sheeting and tight-fitting plastic end caps. After collection, the soil samples were labeled, logged on a chain-of- custody form, and immediately stored in an iced cooler pending transportation to the ' analytical laboratory. 4.3. DEBRIS AREA Underground Services Alert (USA) was contacted at least 48 hours prior to field activities ` in the debris area. On July 1, 2005, Kleinfelder observed the excavation of twelve test pits within a reported backfill/debris area located west by northwest of the track and western stands area (Plate 2). RAH Environmental of Loomis, California provided an ' excavator and operator for excavation of the test pits. One of the 12 test pits (TP11) was abandoned after the backhoe bucket damaged a subsurface water line. The total depth of the remaining test pits ranged from 6 to 15 feet bgs. The test pits were located within an area approximately 600 feet long and 95 to 160 feet wide. The attached Table 4 is a summary of the total depth of each test pit , type of soil sample collected, debris noted and relevant comments. In general, the debris appeared to be building demolition material. The primary fill material was concrete, followed by asphalt and wood with trace amounts of miscellaneous items nc,l ding bricks, tire, hoses, sheet metal parts, wire, plastic, burnt wood, aggregate concrete tile, and glass etc. For details refer to Table 4. A total of 7 soil samples including six 4-point composite samples (from excavated material) and one discrete soil 1 sample were collected (bottom sample from TP2 at 15 foot depth). Five composite samples and one discrete sample was analyzed for selected heavy metals, VOCs, SVOCs and petroleum constituents (See Section 5.1.4). ' For safety reasons it was necessary to collect the discrete soil sample from the bucket of the excavator. After the bucket of the excavator had collected soil from the desired ' depth, the soil sample was taken in proximity to the teeth of the bucket. Soil located near the teeth of the excavator bucket is generally less disturbed and more representative of the desired sampling interval than other soil in the backhoe bucket. a The soil samples were collected by pushing a 2-inch diameter by 6-inch long stainless steel tubes into the soil. The stockpile soil samples were collected at four locations approximately representative of equal volumes of the stockpile/s. The stockpile soil Page 11 of 22 58671.E02/ST05R1127/DH:ly September 1 1 2005 ©2005 Kleinfelder, Inc.