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sp u r <br /> FIELD PROCEDURES <br /> Subiect've 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 baiter was retrieved and the <br /> water sample examined for free product,sheen.or other subjective evidence of hydrocarbons. <br /> Ping <br /> A minimum of 3 well volumes of ground water, corresponding to approximately 30 to 36 <br /> -1 through MW-3 using an electric submersible pump. <br /> gallons, were purged from wells MW <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 /> ound <br /> ff_-Waler 'arn lin <br /> Groundwater samples were collected after water in each well recovered to near its original <br /> level. The ground-water samples were collected by lowering a clean Teflon bailer gently <br /> through ill air-water interface to a depth approximately 3 feet below the ground-water <br /> surfa,,. The bailer was retrieved and the samples were transferred sIowiy 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 cf Custody Record that <br /> accompanied the samples to the analytical laboratory. A copy of that record is attached to <br /> this letter report. <br /> !;round-Water Reporting <br /> Hydrocarbon constituents in groundwater 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, ethylbenzene, 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 /> 0626gbro <br /> 3805]-4 <br /> s -� <br />