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I <br /> I , , <br /> I I <br /> ' I <br /> i' 23 April 2002 <br /> f AGE NC Project No 98-0521 <br /> ' Page 5 of 7 <br /> I E <br /> I 1 <br /> Based on data'recorded by the transducers, aquifer stabilization was achieved utilizing a 4-gpm <br /> pumping rate after approximately 31 hours of pumping operation , <br /> a <br /> 312�2 Aquifer Response Analysis <br /> The maximum ground water draw-down in wells MW-1 and OW-1 through OW-4 versus the <br /> I <br /> distance of each well from the extraction point were graphed on semi-loganthmic paper(Appendix <br /> G), utilizing the Distance-Drawdown Method(Jacob straight-line method), general transmissivity, <br /> ' storativity,+and hydraulic conductivity values were determined (Appendix H) Ground water levels <br /> in the seven observation wells all appeared to be influenced with measurable draw-down during the <br /> I ` pumping test , ' - , I <br /> 1I <br /> UtihztngIdata collected from the observation wells, a transmissivity value was calculated at <br /> 60 9 ft'/day,a storativity value calculated at 0 004,a hydraulic conductivity value of 0 0018 cm/sec <br /> and a radius of influence projected at 220 feet u� t�izmg a semi-logarithmic plot of draw-down versus <br /> distance(Appendices G and H) Results f the aquifer ground water pumping test are summarized <br /> s in Table 3,a site plan depicting the radiu of influence during the 04 and 05 February 2002 pumping <br /> f 3 test is depicted in Figure 3 <br /> 13 2 3 Effluent Water Sampling Procedures <br /> " Three grab`water samples were collected directly from the discharge hose utilizing three 40-m1 EPA- ' <br /> approved VOA vials containing 0 5 ml, 18%hydrochloric acid as a sample preservative Following <br /> sample collection,the preserved sample's were properly labeled,logged on a chairs-of-custody form, <br /> i placed in a chilled'container and transported to Cal Tech Environmental Lboratones (CTEL), a <br /> California Department of Health Services-certified laboratory for the following analyses <br /> Total petroleum hydrocarbons quantified as gasoline (TPH-g ) in accordance with EPA <br />' Method 8015 Modified, <br /> I, I ' w � <br /> } Benzene; toluene, ethyl benzene and total xylene (BTEX) and methyl tertiary-butyl ether <br /> (MTBE)'in accordance with EPA methods 8020, <br /> 1 1 I <br /> I ',li I ' • The oxygenated compounds di-isopropyl ether (DIPE),,ethyl tertiary-butyl ether (ETBE), <br /> 1 4 MTBE, tertiary-amyl,methyl ether (TAME' ), tertiary butanol (TBA), methanol, ethanol, <br /> t r ethylene dibromide (EDB) and 1,2-dichloroetharie (1,2'-DCA),in accordance with,EPA <br /> � 1 1 <br /> n II Method 8260B <br /> I IF <br /> E <br /> i <br /> ` 4 y V I I <br /> II + I I <br /> �dvancedv GeolEnviroomental,']ne � I <br /> d <br />