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I <br /> 23''Apn12042 <br /> AGE,NC Project No 98-0521 i <br /> ' Page 7 of 7 ` <br /> 0 0018 cm/s (Appendix H),,a hydraulic conductivity of 0 001 S cm/s is consistent with a <br /> screened interval located within silty sand or clean sand( Appendix K) <br /> I <br /> • Laboratory analysis of extracted water collected during the pumping test detected elevated <br /> ' concentrations of TPH-g, BTEX, MTBE and TAME Lessor concentrations of TBA and <br /> ! 1,2-DCA were also detected (Tables 4 and 5, Appendix n <br /> 5.0. RECOMMENDATIONS <br /> r <br /> Based on the ground water aquifer pumping test results,AGE recommends ground water extraction <br /> as a feasible remediation option for removal of hydrocarbon-impacted groundwater at the site Based <br /> on the estimated radius of influence of 220 feet and site specific aquifer characteristics inferred from <br /> the pumping test, AGE believes that limited ground water extraction at the site will effectively <br /> „k address the hydrocarbon-impacted ground water plume and inhibit further migration of petroleum- <br /> impacted ground water off-site <br /> c <br /> Extracted ground water from MW-2 could be pumped directly through an on-site ground water <br /> pump-and-treat system The ground water pump-and-treat system would utilize granular activated <br /> carbon (GAC)to addfess TPH-g, BTEX'and fuel oxygenates, mcludmg MTBE, TAME and TBA, <br /> in extracted ground water Following treatment,'water,could then be discharged into the City of <br /> Stockton sewer system under a Clty of Stockton Public(Works permit <br /> F ' � G.O. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill,ordlnanly exercised by <br /> ' environmental consultants,practicing in this or similar localities The findings were based mainly <br /> upon,analytical results provided byian independent Jaboratory Evaluation of the hydrogeologic <br /> , s � V <br /> conditions at the 'site for the purpose of this investigation are made from a limited number of <br /> available data points Solmst water level meter,pressure transducers and groundwater samples),and <br /> I k subsurface conditions may vary away from these 'data points No,other,warranty, expressed or <br /> ' implied,is made as to the professional interpretations,opinions and recommendations contained in <br /> this report i <br /> i <br /> , <br /> 1 I <br /> Advanced GeoEnvironmental,Inc H i <br /> , <br /> II jft'I I ` I <br />