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1 <br /> - 15 September 1995 — <br /> AGE-NC Project No 95-0105 <br /> ' Page 7 of 7 <br /> extent of the hydrocarbon-impacted soil was defined by sample SW-1 However, hydrocarbon- <br /> impacted sods remains north of the former pump islands under Grant Line Road, west of tank <br /> excavation"A"under Parker Avenue and southeast of MW-3 Due to structural constraints imposed <br /> by Grant Line Road to the north, Parker Avenue to the west and the existing building/canopy to the <br /> southeast, additional removal of the soils is not considered feasible <br /> We recommend the installation of one soil boring (or direct push probing) west of the site within <br /> Parker Avenue to further evaluate the western limit of hydrocarbon-impacted soil A second boring <br /> or probing should be installed south of boring B 1 to delineate the southern lirut of the hydrocarbon- <br /> impacted soil plume This additional data can then be used to perform a risk assessment modeling <br /> analysis <br /> 5 2 HYDROCARBON-RAPACTED GROUND WATER <br /> ' Only low concentrations of petroleum hydrocarbons were detected in monitoring well MW-3 during <br /> the two monitoring penods in 1995 and in 1988 However,based on the northerly ground water flow <br /> direction and the elevated hydrocarbon concentrations in grab water samples collected from bonngs <br /> B 1 and B2, the dissolved hydrocarbon ground water plume has migrated beyond B2, potentially <br /> further than the property limits The extent of thus plume has not been delineated <br /> We recommend the installation of two additional monitoring wells to delineate the down-gradient <br /> extent of impacted ground water Both wells will have to be installed off-site, along the north side <br /> of Grant Line Road <br /> 6.0. LIMITATIONS <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> environmental consultants practicing in thus or similar localities The findings were based upon <br /> analytical results provided by an independent laboratory Evaluations of the geologuc/hydrogeologuc <br /> conditions at the site for the purpose of thus investigation are made from a lunuted number of available <br /> data points(i a monitoring wells, soil samples) and subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional recommendations <br /> contained in this report <br /> 7 <br /> 1 <br />