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' 03 January 2002 <br /> .} AGE-NC Project No 96-0229 <br />' Page 5 of 5 <br /> • Continued utilization of wells MW-1 through MW-10 for quarterly groundwater monitoring <br /> and sampling <br /> Based on previous site investigations, quarterly ground water monitoring results and cone <br /> penetrometer testing (CPT) soil borings advanced at the site in July 2001 (Cone Penetrometer <br /> Testing Site Investigation - Third Quarter 2001, 28 November 2001), AGE recommends <br /> • Installation ofadditional <br /> deep-screened ground water monitoring wells to delineate the <br /> vertical extent at the site, the screen Intervals for the deep-screened monitoring wells should <br /> be placed in areas to define and monitor the extent of the ground water plume in each <br /> Informal hydrologic unit Identified by the CPT Investigation <br /> • Ground water pump testing be performed at the site to obtain general aquifer characteristics <br /> such as hydraulic conductivity, transmisslvlty, storativity and drawdown at various pumping <br /> rates Results of the pump test would be utilized to estimate a radius of Influence for the zone <br /> fof capture of dissolved petroleum hydrocarbons and to evaluate the feasibility of ground <br /> water extraction as a remediation option <br />� .' • Ground water monitoring events should be performed concurrently at the Pacific Car Wash <br /> site and the former Arco Mini-Mart (Pacific Mini-Mart), located at 4511 Pacific Avenue, <br /> Pacific Mini-Mart ground water monitoring wells could be utilized to assess the northern <br /> extent of dissolved petroleum hydrocarbon plume <br /> I6.0. LIMITATIONS <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 Evaluations of the geologic/hydro- <br /> geologic conditions at the site for the purpose of this investigation are made from a limited number <br /> of available data points (e g ground water samples), and subsurface conditions may vary away from <br /> these data points No other warranty, expressed or implied, is made as to the professional <br /> i recommendations contained in this report <br /> Advanced GeoEnvironmental,Inc <br />