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1 <br />' 23 March 2001 <br /> • AGE-NC Project No 95-0130 <br />' Page 6 of 6 <br />' 4.0. RECOMMENDATIONS <br /> Based upon the CPT investigation results during the first quarter 2001, AGE recommends <br />' 1 Continued quarterly ground water monitoring, the next quarterly ground water monitoring <br /> event is tentatively scheduled for June 2001 <br />' 2 Additional vertical ground water investigation is warranted to assess the vertical and <br /> horizontal extent of petroleum hydrocarbon-impacted ground water at the site AGE <br />' recommends at least five additional CPT soil borings to assess the vertical and horizontal <br /> extent of hydrocarbon-impacted ground water at the site <br /> 3 Installation of additional shallow and deep-screened ground water monitoring wells based <br /> Ion the findings of the existing shallow ground water monitoring wells and CPT soil bonngs, <br /> the screen intervals for the deep-screened monitonng wells will be placed to define and <br /> monitor the vertical extent of the ground water plume in each informal hydrologic unit <br /> 4 Conduct a ground water pump testing to obtain general aquifer characteristics such as <br /> hydraulic conductivity, transmissivity, storativity and drawdown at various pumping rates <br /> Results of the pump test would be utilized to estimate a radius of influence for the zone of <br /> capture of dissolved petroleum hydrocarbons <br /> I 5 Install and continuously operate a ground water extraction system (interim remediation) in <br /> the area between MW-3 and P-12 (along geologic cross section D-D' to inhibit further <br /> vertical and off-site migration of the fuel-impacted ground water plume <br /> 5 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 (CPT data and ground water samples), and subsurface conditions may vary <br /> away from these data points No other warranty, expressed or implied, is made as to the professional <br /> recommendations contained in this report <br /> f <br /> • <br /> Advanced GeoEnvirun mental,Inc <br /> I <br />