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WM _ x <br /> r '' sem- �' - '- - g^-y:- .. r- - .. 'd ..».`•T sex .-" ;�"P a`. ' <br /> � R+ xx� <br />'� �:e .,. � � �_. �3,�i _.�' -ice _ �'€_....:_. ,�r, ,�"i��;_ .^'1 ,;.����.:i� - :•� .z,.- -_ �.a�?,. _ � '`� _ `_'.'� .� X-� )- , <br /> ` regardlosso of sampling interval, la required. Between namplur <br /> tho downhole equipment will be washed with a trisodium phosphnto <br /> detergent and then rinsed with tap water and distilled water. <br /> All soil namples will be screened for hydrocarbon content with an <br /> organic vapor analyzer (either FID or PID). After collacticn and <br /> screening, the sample will be neaaled with aluminum foil and PVC <br /> :S <br /> caps and placed on ice. Selected camplac will be shipped to a <br /> California Department of Health Services certified analytical <br /> laboratory within 24 hours. The soil samples collected from just <br /> above the water table and samples with OVA-detectable final con- <br /> tamination will be analyzed for total petroleum hydrocarbons <br /> (TPH) and selected volatiles gasoline constituents MA), using <br /> modified BPA 8015, 8010, 8420, 8240, and GC-FID methods as appro- <br /> pr1ato. Soil borings will be logged by a supervising gooiogiat <br /> who will oversee all well construction and sampling and described <br /> } according to the Unified Soil Classification System. All drill <br /> r cuttings will romain on the site and handled an the other <br /> i <br /> excavated toils have been. <br /> After ccmpletion of each monitoring well but not lass than 48 <br /> hours, the well will be developed using dither a submersible <br /> stainless eteel pump, PVC hand pump, or a FVC hand pump or bailer <br /> (depending on yield) until the water is free of solids and <br /> turbidity. <br /> Ground-water sampling will be done .,f a trained geologist or a <br /> trained environmental scientist. Before sampling, each well will <br /> be purged by the removal of four or fives casing volumes of water <br /> with a precleaned bailer, Purged water will be filtered through <br /> activated carbon and put Into 55-gallon drums. A sample of the <br /> filtered water will be taken for total pztro_leum hydrocarbon <br /> ---- — --analysis. All drums will be stored on-site or in EA'a warehouse---- - -- <br /> until sample results are received and than disposed of <br /> appropriately. jlVt t' i��x�, F.f�1; #'r 'ti .t1. <br />