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CLEARWATER <br />' G R O U P I N C <br /> Environmental Services <br />' 4 2 Recommendations <br />' On the basis of the results of this investigation, Clearwater recommends the following <br /> • Install up to eight Geoprobe soil borings to 25 feet bgs for collection of soil and groundwater samples <br /> to attempt to complete lateral delineation of dissolved-phase petroleum hydrocarbons associated <br />' with the subject release, and to investigate the possible impact of off-site sources Three borings <br /> will be located on each side of South Fresno Avenue located so as to intersect groundwater flowing <br />' through and to the north and south of the current well configuration One boring will be located on <br /> each of the north and west site boundaries in order to investigate possible off-site contamination <br />' extending from upgradient locations onto the subject property <br /> • Discontinue fuel oxygenate analysis based on the absence of detectable concentrations of fuel <br />' oxygenates in all previous sampling events <br /> 1 <br /> t <br /> 1 <br /> 1 <br /> i <br /> 1 <br /> 1 C-178 WELL INsr RFT 7 May 7, 1999 <br />