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Fuller Mobile Home Park L '365 East Louuse Avenue,Lathrop,.California September 6, 1994 Phase II Additional Site Characterrzation Page: 6 The soil samples will be.taken using a California Modified Split Spoon sampler with brass liners. The sampler will be driven continuously by a wire line hammer. 11 JI The laboratory samples will not have head space and will be immediately sealed in their liners using aluminum foil lined plastic caps. The remaining sample will be removed from its liner tobe used as an aide to the on-site geologist in logging the material at that depth. u Soil samples collected fur analysis will be analyzed using EPA method 8015 modified for .total petrol'bum hydrocarbons in the gasoline range, 'EPA method 35I0/LUFT for diesel range petroleum hydrocarbons, and EPA method 8020 for BTX&E compounds. Tlie minimum detection limits used for each analyte will be 005 mg/kg for BTX&E, 2.5 mg/Kg for gasoline, and 5.0 mg/kg for diesel. Analyses are to be conducted by GeoAnalytical Laboratories, Inc.11 in Modesto, y California. 3.5 Ground Water Sampling A travel blank provided by the laboratory will accompany the samplel,vials from the time they are picked up V6 the lab to the time they are delivered to',the lab. This travel blank should be listed on the Chain of Custody but will be an"alyzed only if f all samples contain the same contaminants. L � u All sampling equipment including the pump, bailer, and cables, used by sampling personnel, will be disassembled, if appropriate, and steam-cleaned prior to commencement of sampling. These procedures will also be followed.between each well, sampling point, an at the end of the sampling day. De-ionized or organic- free water (also provided y the laboratory) will then be introduced into the pump or bailer as a final stage�of'cleaning. This water will then be pumped or gently poured into sample vials to be used as pump or bailer blanks. These blanks will be tested only if their corresponding samples are found to contain contaminants. Immediately prior to sampling, water levels and welI depth measurements will be t taken in all wells at the site. Each well will be evacuated using a stainless steel I— bladder pump, which does not int.oduce air into the water column, or a Teflon bailer. The pH, temperature, and electrical conductivity of the water will be monitored as the well is evacuated. These parameters will be noted on a field log. Instruments calibrated to known standards will be used to monitor these parameters. At least fivewell volumes N ill be evacuated from each well, and L more, if necessary, until the above parameters have stabilized. Wells that are de- watered 'before evacuation of five well volumes has been accomplished will be sampled upon eighty percent recovery of the initial water level. The wells or other sampling points will be sampled in order of the least to the most contaminated, as best known or estimated'I The samples will be pumped from a stainless steel bladder pump or carefally poured from a Teflon bailer into clean glass vials with