Laserfiche WebLink
� 23 April 2002 <br /> AGE NC Protect No 98-0521 <br /> Page 6of7 ' <br /> r <br /> I <br /> 3 2 4 Extracted Water Analytical Results <br /> 1 , <br /> TPH-g was detected in each of the three grab water samples at concentrations as high as 1,700 µg11 <br /> BTEX compounds were detected in the three samples at concentrations as high as 63 pg/1 benzene, <br /> 4 0µg/1 toluene,27 pg/1 ethylbenzene and 44 gg/l xylenes MTBE,TAME,TBA and 1,2-DCA were <br /> detected at concentrations as high as 440µg/1, 15 µg/l, 120pg/l and 12µg/l,respectively Laboratory <br /> results are summarized on Tables 4 and 5 The laboratory report(CTEL Laboratory IDs 0202-030-1 <br /> through 0202-030-3) and chain-of-custody forms are presented in Appendix I <br /> ' S <br /> 3 2 5 Extracted Ground Water Disposal <br /> On 06 February 2002, the ground water extracted during the pumping test was pumped from the <br /> 4 aboveground storage poly tank into a vacuum truck (supplied by American Valley Waste Oil), <br /> approximately 9,000 gallons of purged water was transported off-site under a hazardous waste <br /> manifest to Seaport Petroleum, a waste treatment facility located in Redwood City, California <br /> Documentation and uniform hazardous waste manifests for disposal of the pump test extracted water <br /> is contained In Appendix J <br /> ' 4.0. 'SUMMARY AND CONCLUSIONS , <br /> , The implications from the two aquifer ground water pumping tests are <br /> r • I <br /> l Dunng,the constant pumping rate test(4 gpm),ground water draw-down of at least 6 69 feet <br /> was observed,in,extraction well MW-2 following approximately 31 liours of pumping i <br /> I operation, ground water draw-down was observed in each of the observation wells ranging <br /> from 4 89 feet (OrW4 located approximately 8 feet south of MW-2) to 0 50 feet (OW'4 <br /> €' located approximately 145 feet south ofMW-2) Draw-down results are presented on Table"3 <br /> and in Appendix E, Figure 2 illustrates wellrlocations I' <br /> • 0,tilizing a semi-logarithmic plotiof ground water draw-down vs observation well distance <br /> to pumping well(Jacob straight-line method),a best-fit line can be utilized to prod ect a radius <br /> i of influence of approximately,220 feet at 4 gpm (Appendx G) ' ' I' <br /> f <br /> • Utilizing the Distance-Drawdown Method(Jacob,straight line method),a transmissrvrty was' r <br /> ` calculated at 60 9 ft2/day (equivalent to 454 5 gallons per day/ft) and I a storativity value <br /> E calculated at 0 004 A eridix-H it r I ,i <br /> Based on'a transmissivity value of 60 9 ft'/day and an aquifer thickness equal to'12 1 ft <br /> (screen interval at MW-2), a hydraulic conductivity value was calculated'at 5 03 ft/day, or i <br /> I <br /> ' t Advanced GeoEnvironmentai,Inc <br /> E M I <br /> Ip <br /> r eIf' E I <br />