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7. q- - <br /> 2.0 PROC-LD RES <br /> Depth to ground water 'was Measured in each well. The well volttnle was calculated by <br /> adding the casing voluiltC u, the annular volume (assuming a 30 percent porosity). Each <br /> well was purged of a minimum of three ttiell VOILlI11eS based on the recommendation of Mr. <br /> Marlin Knoll with the County who waS in attendant The minimum nnrount of water <br /> necessary to purge attd the actual approximate alnnunt purged (gallons) for each %veil is <br /> listed below. <br /> 4`Jf:L.I. 3 WELL VOI-A)NIF VOL.UM1 PURGE <br /> mW-1 5o.5 60 <br /> MW-2 qSA 60 <br /> MW-3 57.0 60 <br /> k <br /> A submersible pump was used for purging and the pumping rate was five gallons per <br /> minute. This rate slightly exceeded the wells' capacity and occasionally the pump would <br /> shut off for a ten-minttte interval while. the %veil recovered. At three or four intervals for <br /> each well a sample of water was collected and nleastn-Cd for the ground-water duality <br /> parameters of conductivity, pl-1 and temperature. The +veil was considered stabilized when <br /> the water ran clear and the parameters were within 10% of the previously r,2corded value. <br /> For decontamination between each well, the punt}1 +.gas run in a drum of Alconox solution <br /> and then a drum of tap water. Purge ,rater was placed in a labeled drum rind left on site. <br /> Disposable hailers were used to sample each .veil. Three 40-milldliter VOA bottles and <br /> an amber one-liter bottle were collected from evch :ve!l. Ah samples were placed in cold <br /> swragc with a trip hltulk :incl u-anyported by chain-of-custody to Curtis and Tompkins, a <br /> California. state-certified analytictt! lahoratosv. All sanlplca were analyzed for Total <br /> a Extractable Hydrocarbons(YEI-1),diose[(C"alifall-nia DO1-IS h9C010d)and Benzene,Toluene, <br /> Ethylhenzene and Total Xylenes (i3'fEX) (EPA 80_0, Extraction GPA 5030). <br /> i <br />