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01 March 2002 <br /> . AGE-NC Project No 95-0130 <br /> Page 9 of 10 <br /> MW-7 (B and D) and low concentrations detected at MW-7 (C and E) <br /> • Significant petroleum-impacted ground water was detected at MW-6 (B and C) and lesser <br /> concentrations detected at MW-6 (D and E), the concentrations appear to decrease with <br /> increasing depth <br /> 5.0. RECOMMENDATIONS <br /> Based upon the results of the September and October 2001 multi-level well investigation, AGE <br /> recommends <br /> • Preparation of a feasibility study work plan for a ground water pump testing to obtain general <br /> aquifer characteristics such as hydraulic conductivity, transmissivity, storativity and <br /> I drawdown at various pumping rates Results of the pump test would be utilized to estimate <br /> a radius of influence for the zone of capture of dissolved petroleum hydrocarbons <br /> • Preparation of a feasibility study work plan for a 24-hour soil vapor extraction feasibility <br /> pilot test <br /> • Preparation of a feasibility study work plan for a 48-hour in-situ air sparging feasibility pilot <br /> test <br /> • Preparation of an interim remediation work plan to continuously operate a ground water <br /> extraction system in the area of VW-1, VW-2 and VW-3 to inhibit further off-site migration <br /> of the fuel impacted-ground water plume <br /> I <br /> • Installation of additional shallow-screened ground water monitoring wells on-site because <br /> wells MW-1, MW-2, MW-3, MW-4 and MW-5 have become significantly"drowned" <br /> • Installation of additional multi-level ground water monitoring wells off-site towards the east <br /> and northeast to assess down-gradient impact to shallow and deeper ground water <br /> • Conduct future quarterly ground water monitoring events concurrently with the Knowles <br /> Roek site (102 South Wilson Way) and the Arco A4/PM site (130 South Wilson Way), <br /> AGE recommends that a well-head elevation survey be performed by a state-certified <br /> surveying engineer so that reported ground water elevations are relative to a City of Stockton <br /> benchmark datum AGE has tentatively scheduled the next quarterly ground water <br /> monitoring event for March 2002 <br /> i <br /> • <br /> iAdvanced GeoEnvironmental,Inc <br /> i <br />