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11 PES Environmental, Inc- <br /> Mr. Jeff Werner <br /> `. February 12, 1991 <br /> PagC <br /> Groundwater extracted during development and sampling will be stored onsite until chemical <br /> t� results are obtained from the analytical laboratory. Offsite disposal of extracted groundwater r <br /> at a hazardous waste disposal facility may be required. <br /> Prior to development or sampling activities in may well, groundwater elevations will be <br /> measured for documenting the direction and gradient of groundwater flow in the upper <br /> ` ll be measured using an oillwater interface probe or <br /> a4uifer zone. The depth to water wi <br /> t.a electric sounder. <br /> l Sulstask 3C. Extraction Weill Aquifer Testing and Sampling <br /> a <br /> s This subtaslc inco!ves pumping the extraction well and collecting water samples and well <br /> performance data under pumping conditions. The data obtained from this test will be used in <br /> r the detailed evaluation of remedial alternatives and the preliminary design of tt:u n <br /> extractic <br /> and treatment systems. Results from groundwater samples will be.used to assess the <br /> potential of treatmentlex'aactior,system fouling due to scaling, metal precipitation or <br /> biological growth. The pumping well performance data will provide information,regarding <br /> atreatment system and extraction system sizing. The aquifer test will be performed as <br /> follows: <br /> The extraction well will be pumped at four different rates for approximately one hour <br /> at each flow rate. The pumping rate will be increased with each subsequent step of <br /> 1n the final stip, the <br /> extraction well will be pumped far about 2 to 4 hours <br /> pumping. data at the highest flow rate. After pumping has <br /> to obtain longer term pumping <br /> stopped, the recovery of water levels will be monitored. <br /> (.� • During the aquifer test, water-level data will be collected at equal time intervals by a <br /> pressure transducer in the extraction well and electronically stored in a datalogger. In <br /> l , order to determine the lateral influence of pumping on the groundwaser. a pressure <br /> I <br /> transducer will also be placed in a nearby monitoring well to gather water-level data <br /> during the test. PES will make penodic manual water-level measurcments to calibrate <br /> s the transducer readings. <br /> • The following temporary equipment setup will be required to conduct the test:fie well <br /> placing a submersible pump in the well; and 1<} piping discharge <br /> uire disposal or treatmrzt at an <br /> to a storage tank. The stored discharge water will req <br /> appropriate facility. <br /> a The following analyses will be performed on two samples collected during the aquifer <br /> test: (1) Title 22 Drinking Water Analysis, t') total and fecal coliform: and (3) 'T'PH <br /> as gasoline benzene. toluene, ethylbenzene, and xylenes (EPA Method 801518020); <br /> R� and (4)TPH as diesel (EPA Method 8015). <br /> ceav�ert-,rp.+y5 - <br /> i <br /> 1 - <br />