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Workplan for 19256 North Highway 99- 12/22/98 page 8 Job No 024 98 The soil samples will be examined by a Gallardo & Associates geologist for obvious signs of contamination and classified according to the Unified Soil Classification System These Iobservations will be recorded in the boring logs 7.2 Collection Devices ' Soil samples obtained during drilling will be collected using a 2 '/2-inch diameter split-spoon sampler containing three brass liners A minimum of one borehole will be continuously I cored to provide a picture of subsurface lithology The sampler will be decontaminated before and after each use by steam cleaning, or an Alconox solution wash, and tap water or deionized water rinses The sampler will be placed down the boring and driven or pushed 18- inches into the soil using a 140-pound hammer 7.3 Soils Classification ' The entire driven and recovered length of the sample will be examined b a Gallardo & � P Y Associate's geologist for obvious signs of contamination and classified according to the Unified Soil Classification System By requiring a minimum of one continuously cored borehole, an accurate lithology of the underlying soils can be accomplished These Iobservations will be recorded in the boring logs 7.4 Sample Labeling and Chain of Custody Soil samples from each boring will be labeled indicating project name (or number), sample depth, date and collection time The same information will be recorded on the chain-of- custody sheet (s) 8.0 WATER SAMPLE COLLECTION Groundwater samples will be collected by placing either a stainless steel or disposable bailer, or polyethylene tubing connected to a peristaltic pump, down the center of each borehole to allow for an in-situ "grab"water sample collection Water flows freely into the bailer or tubing and is then removed from the borehole The captured water is then placed in the appropriate sample media If a stainless steel bailer is used, it will be decontaminated prior to each use If tubing is used, it will be ' changed prior to each use Sample vials and bottles will be filled to overflowing and sealed so that no air is trapped in the vial Ior bottle Once filled, samples shall be inverted and tapped to test for air bubbles Samples will be contained in vials and bottles approved by the US EPA and the RWQCB,Central Valley (5 S) Region ' Some analyses may require separate sample containers in accordance with EPA methods described in 40 CFR Part 136 and SW-846 Water samples intended for volatile hydrocarbon analysis will be contained in 40 ml VOA vials prepared according to EPA SW 849 and capped with Teflon-lined septa caps Samples intended for EPA 8015/602 analysis will contain a small amount of preservative (HCL) Samples intended for EPA 601 and EPA 624 GCMS procedures will not be preserved Water samples intended for low