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I <br /> 19 February 1997 <br /> Ile <br /> AGE-NC Project No 95-0104 <br /> Page 6 of 6 <br /> • Petroleum hydrocarbon odors and organic vapors were detected in field duplicate samples <br /> collected from MW-6 at depths between 45 and 60 feet and in soil samples collected from <br /> MW-5 at a depth of 75 <br /> IPetroleum hydrocarbon-impacted soil (vadose zone) appears to be limited to an estimated 15- <br /> foot radius beneath the former UST area (Figure 5) <br /> IBetween August and December 1996, ground water flow direction beneath the site rotated <br /> approximately 27' southeast to northeast <br /> I Between October and December 1996, TPH-g and BTE&X increased in VW-1 Due to <br /> elevated concentrations of petroleum hydrocarbons present, it appears that VW-1 is located <br /> near the center of the dissolved hydrocarbon plume <br />' Concentrations of benzene, toluene and xylenes detected in VW-1 exceeded the State of <br /> California Maximum Contaminant Levels (MCLs) for drinking water of 1 0, 150 and 1,750 <br />' /,cg/l, respectively <br /> MTBE was not detected during the December 1996 sampling <br /> I • <br /> 42 RECOMMENDATIONS <br /> Based upon the results of this investigation, AGE has the following recommendations for <br /> consideration <br /> • MTBE should be eliminated from the monitoring program <br /> • A Corrective Action Plan (CAP) has been prepared by AGE Upon approval of the CAP, a <br /> Remedial Action Work Plan should be prepared and remediation should commence <br /> • The next quarterly monitoring should be scheduled for March 1997 <br /> S.U. 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 upon <br /> analytical results provided by an independent laboratory Evaluations of the geologic/hydrogeologic <br /> conditions at the site for the purpose of this investigation are made from a limited number of available <br /> data points (i a monitoring wells, soil borings) 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 /> I <br />