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' 06 July 1999 <br /> i AGE-NC Project No 95-0173 <br />' Page 5 of 6 <br /> • TBA was detected in ground water samples collected from wells MW-7 and MW-8 at <br /> concentrations as high as 21 yg/l <br /> • From January to April 1999, a decrease in dissolved petroleum hydrocarbon concentrations <br />' was observed from well MW-1, MW-3, MW-4 and AW-213 (Table 2) Conversely,increases <br /> were observed from wells MW-2, MW-7, MW-9 and MW-10 <br />' • The elevated concentrations of petroleum hydrocarbons detected in samples collected from <br /> wells VW-1, AW-1B,AW-213, MW-2, MW-3 and MW-4 indicate that these wells are within <br /> or near the dissolved petroleum hydrocarbon "core area" of the plume <br />' • The dissolved petroleum hydrocarbon plume appears to be sufficiently contained within the <br /> current array of ground water monitoring wells, however the increased hydrocarbon <br />' concentrations reported in wells MW-2, MW-9 and MW-10 and decreased concentrations <br /> reported in well MW-1, MW-3 and MW-4 may indicate migration of the plume <br /> southeastward <br /> lie5.0. RECOMMENDATIONS <br /> Based upon data collected during April 1999, AGE recommends <br /> • Continued quarterly ground water monitoring and sampling should be performed at the site <br /> to monitor dissolved TPH-g,TPH-d, BTEX, MTBE and fuel oxygenating compounds at the <br />' site The next quarterly monitoring event should be tentatively scheduled for July 1999 <br /> • Continued utilization of wells VW-1, AW-1B and AW-213 for characterization of ground <br />' water conditions in the "core area" <br /> • Installation of the proposed remediation system (Remedial Action Work Plan, dated 30 <br />' December 1998) upon pre-approval by the California Underground Storage Tank Cleanup <br /> Fund <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 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 />' Advanced GeoEn%iron mental,Inc <br />