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File No. 3359-44 • • 16 March 1995 Page 1 BACKGROUND will be placed in an ice chest and transported with appropriate chain-of-custody documents to WEST According to information provided verbally by the Laboratory for analysis. The borings will be sealed City of Ripon personnel, a 500-gallon-capacity with a cement slurry following sample collection. underground gasoline storage tank and pump were removed from the city's corporation yard on To avoid potential cross contamination, the hand California Street. The tank had contained supreme auger and drive sampler will be decontaminated leaded gasoline. The site location is shown on between sampling intervals and borings. Figures 1 and 2. The tank removal occurred Decontamination will be performed by washing approximately 15 years ago. Figure 3 includes the with a trisodium phosphate solution and rinsing former location of the underground fuel storage with distilled water. tank and associated pump. ANALYZE SAMPLES Apparently there were no soil samples collected from the tank excavation to document that no The soil samples will be analyzed for the following petroleum contamination was present. The parameters using the respective analytical method: objective of the proposed soil investigation is to collect and analyze soil samples from the areas that Parameter Method would represent the tank excavation limits. Gasoline EPA method 8015 Benzene EPA method 8020 DRILL SOIL BORINGS Toluene EPA method 8020 Ethylbenzene EPA method 8020 Two soil borings will be drilled. One in the former Xylenes EPA method 8020 underground fuel storage tank location and one in Lead EPA method 6010 the former pump location. The borings will be drilled using a hand auger. The boring depth will PREPARE REPORT be to 15 feet, assuming that the planned hand augering method does not encounter refusal at a After we complete the field work and obtain the shallower depth. This depth should be below the analytical results we will prepare a report. This bottom of the tank excavation since the tank report will document field and laboratory diameter most likely was approximately 4 feet. procedures, results, conclusions, and our And, according to a representative of the City of recommendations for additional investigative work Ripon, the tank was buried approximately 3 feet or remediation,if-warranted. below the ground surface. The boring at the former pump location will also be drilled to a depth of up to 15 feet. Two soil samples will be collected from each bore hole. One sample will be collected from the base of each boring. An additional sample will be collected if evidence of petroleum contamination is detected at shallower depths. If no evidence of contamination is detected, then a sample from 10 feet will be collected. Soil samples will be collected using a drive sampler equipped with brass sampling tubes. After removing the tubes from the drive sampler, the ends will be covered with Teflon tape and plastic end caps. Samples