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i <br /> t t 1 y <br /> 1 t <br /> . 14 May 2003 <br /> AGE-NC Project No 01-0865 <br /> Page 5 of 5 <br /> I r , <br /> 4.0. RECOMMENDATIONS <br /> Based on the ground water aquifer pumping test results,AGE recommends ground water extraction <br /> as a feasible interim remediation option for removal of hydrocarbon-impacted ground water at the <br /> t former UST No 3 area (Figure 2) Based on the inferred radius of influence of 80 feet and site <br /> specific aquifer characteristics inferred from the pumping test, AGE believes that limited ground <br /> water extraction at the site will effectively address the hydrocarbon-impacted ground water plume <br /> and inhibit further migration of petroleum-impacted ground water off-site <br /> To insure that pumping activities at the UST No 3 location will not cause migration of impacted- <br /> ground water from the northern UST Cluster area(Figure 2),AGE recommends a 48-hour constant <br /> rate ( 4 GPM) extraction pilot test Ground water monitoring wells MW-6A/B, MW-14A/B and <br /> MW-15A/B could be utilized as observation points during the pilot test <br /> With favorable results from the constant rate pumping test, AGE recommends implementation of <br /> ground water extraction from EW-2 as an interim remediation measure at the UST No 3 area <br /> Extracted ground water from EW-2 could be pumped directly through an on-site ground water pump- <br /> and-treat system The ground water pump-and-treat system would utilize granular activated carbon f <br /> (GAC)to address TPH-g,TPH-d and BTEX in extracted ground water Following treatment,water <br /> could then be discharged into the City of Stockton sewer system under a City of Stockton Public <br /> Works permit <br /> `5.0. LIMITATIONS , <br /> ! A <br /> i <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in this or similar localities The findings were based mainly <br /> upon analytical results provided by an independent laboratory Evaluation of the hydrogeologic <br /> conditions at the site for,the purpose of this investigation are made from a limited number of <br /> available data points (Solinst water level meter,and ground water samples), and subsurface <br /> -conditions may vary away from these data points No other warranty,expressed or implied,is made <br /> ` as to the professional interpretations, opinions and recommendations contained in this report <br /> t <br /> I r <br /> r <br /> I r I 1 <br /> I <br /> s ' <br /> I � ! <br /> 1 <br /> I <br /> c I! <br /> t � <br /> Advanced GeaEavironmental,Inc <br /> I � <br /> 3 � <br />