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FIELD PROCE URES CSMA <br /> Subjective Analyses <br /> The depth to ground water in the monitoring wells was measured to the nearest 0.01 foot <br /> with an electronic water-level indicator. Samples of ground water were collected for <br /> subjective analysis from the air-fluid interface in each well by lowering approximately half <br /> the length of a clear Teflon bailer through the interface. The bailer was retrieved and the <br /> water sample examined for free product,sheen, oro her subjective evidence of hydrocarbons. <br /> Purging i <br /> A minimum of 3 well volumes of ground water, c rresponding to approximately 30 to 36 <br /> gallons, were purged from wells MW-1 through M -3 using an electric submersible pump. <br /> The purged water was placed into labeled 55-gallon 17-E drums approved for this use by the <br /> California Department of Transportation and stored temporarily onsite pending the results <br /> of laboratory analyses. <br /> Ground-Water Samplin <br /> Groundwater samples were collected after water in each well recovered to near its original <br /> level. The ground-water samples were collected toy lowering a clean Teflon bailer gently <br /> through the air-water interface to a depth approximately 3 feet below the ground-water <br /> surface. Thebailer was retrieved and the samples were transferred slowly to laboratory- <br /> cleaned, 40-milliliter glass vials or other appropriate containers as required by the laboratory. <br /> The vials and bottles contained hydrochloric acid and were filled so that no headspace was <br /> left in the containers. The field technician initiated a Chain of Custody Record that <br /> accompanied the samples to the analytical laboratory. A copy of that record is attached to <br /> this letter report. <br /> Ground-Water Reporting <br />.� Hydrocarbon constituents in ground-water samples are reported by the laboratory in units <br /> of parts per billion (ppb). The maximum contaminant levels listed in Title 22 of the <br /> California Code of Regulations for benzene, eth lbenzene, and total xylene isomers in <br /> drinking water are 1.0, 680, and 1,750 ppb, respectively. The action level established by the <br /> California Department of Health Services for toluene is 100 ppb. To conform with the <br /> laboratory reports, we report ground-water chemical data in units of ppb. <br /> 1 <br /> 1231gbro <br /> 38053-4 <br /> i <br />