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z <br /> 27 January 1999 <br /> AGE-NC Project No 96-0232ell - <br /> Page 4 of 5 <br />' petroleum hydrocarbons are located near MW-1 <br /> • TPH-g and TPH-d were detected in the water sample collected from MW-1 at concentrations <br />' up to 480 µg11, howevdr, the laboratory reported the sample chromatogram did not have t <br /> typical gasoline and diesel characteristics <br /> i MTBE (analyzed by EPA Method 8020) was detected at concentrations up to 1,100µg11 in <br /> samples collected from monitoring wells MW-1, MW-2 and MW-4 through MW-7, analysis <br /> of the samples by,EPA Method 8260 yielded concentrations up to 1,200 µg/l <br />' MTBE was detected at 4 4 ppb in the sample colle6ted from MW-6B, screened between 43 <br /> and 48 feet bsg <br /> • MTBE concentrations have steadily increased in groundwater samples collected from MW-i <br /> between July 1996 to November 1998 <br /> • MTBE concentrations in samples collected from well MW-2 have steadily decreased <br />' between February and November 1998 (Table 2) The decrease in MTBE concentrations . <br /> reported from MW-2 may be related to the recent decrease in ground water elevation <br /> • MTBE-impacted ground water has migrated to the area of the domestic water well located <br /> west-southwest of the subject site, at a concentration of 17 ppb as detected in the shallow , <br />' ground water sample collected from MW-7 <br /> I5.0. RECOMMENDATIONS 1 <br /> Based upon data collected during November 1998, AGE recommends <br /> • Continued quarterly ground water monitoring and sampling should be performed at the site <br /> at least through February and May 1999 to achieve a better understanding of dissolved <br /> MTBE concentrations on and off-site` <br /> r <br /> • 'Preparation of a Feasibility Study to evaluate cost effective alternatives to remediate the <br />' dissolved MTBE plume at the site <br /> 6.0. LIMITATIONS <br /> r <br /> Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> Ienvironmental 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 thus investigation are made from a limited number <br /> Advanced GeoEnwonmental,Inc <br /> r <br />