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-e ENVIRONMENTAL Cuttings and other spoil from the borings will be placed in a p or on sheets of plastic and covered until verified with analytical results whether or not the soil is contaminated. If the material is contaminated, a written plan will be submitted by the facility operator to the county for their approval before treatment and/or disposal occurs. Disposal will be the responsibility of De Rollo Mazda and occur within 90 days of .. completion of drilling. Back filling of borings will occur by pouring a bentonite cement slurry through the auger. Q� `� �, Q r "i �y � 4.2 SOIL SAMPLING Qo C S� (1��i e l• Soil samples will be collected through the auger in 2 c brass sleeves driven in a split ` spoon sampler by a 140 pound hammer with a 30 inch drop in accordance with ASTM Methods D 1586-84 for split barrel sampling of soil and D 1587-83 for thin-walled tube sampling of soils. The brass sleeves and sampler will be steam cleaned prior to each use. Soil samples will be driven at depths of 5, 10, 15, 20, 25, 30, and 35 feet in each boring depending on total depth. The blow counts, recovery, and lithology will be recorded on ` the field logs. Lithology will be described in accordance to ASTM procedures D2488- 84 (Standard Practice for Description and Identification of Soils). One brass sleeve with soil from each interval will be capped, sealed, and labeled in accordance with EPA ` protocols, recorded on a chain of custody form, placed in a cooler at 4 degrees centigrade or less, and transported to Med-Tox Associates Laboratory with the chain of custody for the specified analysis. n"\ —\ \ ; ) I� L,, _Q J 4.3 SOIL ANALYSIS t The soils samples will be analyzed by Med-Tox Associates Laboratories, a California State Certified Laboratory in accordance with state guidelines and EPA protocols. The samples will be analyzed for all constituents by EPA methods 8020 and 8015. <�bS (-, )iL_ (_ ) 7"t H ) C,LhfC) fy-u ( � 4.4 FIELD SCREENING OF SOIL SAMPLES P�73 Soil samples will be collected using three six inch brass tubes installed inside a split spoon sampler. The middle sampler will be immediately capped with a teflon liner separating the soil from the lid, and stored in an iced cooler upon collection. The bottom tube will be used for lithological description, and the top tube will be placed in a Mason jar to approximately 50 percent capacity, shaken, and stored for a period of 15 minutes. A standard headspace reading will be collected at this time and noted on the boring log. 5.0 QUALITY ASSURANCE PLAN This section describes field and analytical quality-assurance procedures to be followed during the investigation and remediation. 5