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I <br /> Mr. Johri Pollock <br /> June 2, 1993 <br /> Page 2 <br /> the gasoline range, benzene; toluene,_ethylbenzene, and ethylene dibromide were not <br /> detected in the soil.sam.ple at or above the de-tecfion limits. <br /> PROPOSED INVESTIGATION <br /> Additional investigation is required to evaluate the potential threat of soluble <br /> lead leaching to the groundwater surface. The groundwater surface at the site is <br /> expected to be located at depths ranging between-120 ft and 150 ft beneath the <br /> ground surface. <br /> Our proposed scope of work includes drilling, logging; and-sampling one soil <br /> boring to a depth of'15 ft;laboratory analysis of one soil sample for soluble lead,.and <br /> appropriate reporting. - <br /> Soil Boring <br /> The boringwill be drilled b a licensed well-driller using a SIMCO portable <br /> Y . _ g <br /> drilling rig:equipped with 4-in-hollow-stem augers. Drilling equipment; including <br /> augers and samplers, will be steam-cleaned prior to use in the boring. Soil samples <br /> will be collected at 5-ft intervals and/or at lithologic contacts in the boring using a <br /> California-modified split-spoon sampler fitted with clean stainless steel'sleeves. The <br /> sampler will be cleaned in an Alconox solution and rinsed with deionized water <br /> between samples. A photoionizing organic vapor meter,(OVM)will be used during <br /> sampling to detect potential hydrocarbonconcentrations in the soil samples. <br /> Drilling operations will be supervise' d,by.a qua]ified'environm ental geologist <br /> and soils will be logged using the Unified Soil Classification System. Drill cuttings <br /> will be placed on plastic sheeting, covered with plastic, and left.onsite pending the <br /> results of laboratory analyses. The soil boring will be abandoned by backfilling with a <br /> slurry of neat cement with-less than 5% bentonite powder. <br /> At least one sample sleeve fromeach sample interval will be trimmed of <br /> excess soil, sealed wiih aluminum foil, plastic caps, and airtight tape.. The sample will <br /> be labelled, and placed into iced storage. A soil sample selected-from the boring will <br /> be analyzed for lead using a waste extraction test (WET) and EPA Method 7421. <br /> These methods are recommended by the California Environmental Protection <br /> Agency, and will be performed by a Cal EPA-certified environmental laboratory. <br /> RO GE'R <br /> 312-001 FMT T <br /> ASSOCIM E5 <br />