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y" r t _ .Y S 3.1 Sorin pfethods The borings were advanced using a Mobile Drill B-53 rig with an 8- inch hollow stem continuous flight augers in accordance withASTM Method D 1452-80 for soil investigations and Suidladdeding yto tY►e borings. At no time was any water or other r each boring. The augers were steam cleaned prior to drilling n a boring. The lithology and other pertinent data was re2488e84ofor field boring log in accordance with ASTM Method D visual description and identification of soils. 3,2 Soil Sampling 4 Soil samples were collected through the auger in 2 -inch diameter brass sleeves placed in a split spoon sampler and driven into the soil by a 140 pound hammer with a 30-inch drop of soil and D1587accordance - sampling �k ASTM Methods D 1586-84 for split-barrel sampling ;. 83 for thin-walled tube sampling of soils. The hphosphateleeves and detergent 1 sampler were cleaned and rinsed using solution followed by immersion in deionized water rinse prior to each use. Soil samples were driven at five foot int r ere xecorded in acon boring. The blow counts, recovery, and lithology `a logs (Appendix A) . field Lithology was described in accordance with ASTM procedure D2488-84 (Standard Practice for Descrintian and Identification ca Soils)esealed,one ass labeledsleeve in1 accordancefrom w with selected EPA intervals was capped, f .. protocols, recorded on a chain of Custody Form, Placed in a cooler at 4 degrees centigrade or less, and transported to WEST Laboratories, in Davis, California with the Chain of Custody for :b the specified analyses (Appendix B) . 3.3 Field screenin of Soil Sam ies Soil samples were collected using three six-inch brass tubes ampler. The middle sample tube was installed inside a split-spoon s immediately caped and stored in an iced cooler upon collection. The - ube bottom tube was used for litho Thi mdescription, Leri 1 from the top tubewasi was used for field screening. acit A headspace reading capped at approximately 50 percent cap Y• _. was measured at this time and noted on the boring log. 4.0 Site Geolo The sediments underlying the site are s deposits hich depthconsist Of to ground unconsolidated, silty clay and clayey water is etitimated to be between 4o Noo groundwater ndW ternwasaencounterey - Environmental Health Department) . of the borings advanced for. this assessment which penetrated in any to a maximum depth of 30 feet below surface grade. ni\coross.nPn 3