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Mr Knoll August 17, 1993 Page 2 A duplicate sample was collected from well MW-1 for quality control purposes. The samples were analyzed for Total Petroleum Hydrocarbons (TPH) as diesel and Benzene, Toluene, Ethylbenzene, and Xylenes (BTEX) using EPA method 8015 modified and 8020 respectively. Well purge water and equipment rinse water was contained in DOT approved 55-gallon drums and is being stored on site pending analysis RESULTS The ground water level measurements are approximately 3 feet lower than May of 1993 in three wells, (MW-1, MW-2, and MW-3) and relatively unchanged in MW-4. Based on ground water elevations calculated for MW-1 through MW-3 on July 2, 1993 ground water flow beneath the site is towards the southwest The ground water level measurement for well MW-4 was not used for this determination as ESE believes it is in error The southwest flow direction is consistent with previous findings Laboratory analytical results are presented on Table 2 - Summary of Analysis of Ground Water Samples, and on the attached laboratory analytical documents. TPH as diesel was reported in all samples analyzed at a concentration of 200 nucrograms per liter (ug/L) or parts per billion. BTEX was not reported above detection limits in any of the samples or the trip blank. DISCUSSION The analytical results show a low concentration of diesel fuel without reportable BTEX constituents in both wells MW-1 and MW-4 the trip blank and duplicate sample results were within acceptable criteria for quality control. ESE requested that the laboratory evaluate these data with respect to the diesel fuel standards Mr John Goyette of Curtis and Tompkins Laboratory stated in correspondence dated July 22, 1993, that the fuel quantitated for these samples was most similar to very weathered diesel or a similar carbon range material (correspondence attached). The results from this resampling verify that very low concentrations of TPH as diesel exist in the ground water beneath the site However, because the TPH is less than 5 parts per mullion and BTEX is nondetectable, ESE considers these concentrations to be too low to remediate and not a threat to human health or the environment. Previous investigations have verified that all impacted soil has been removed from the site ESE recommends that one final monitoring event be completed during the summer season • (by September 31, 1993) and that site closure be requested if concentrations of fuel in ground water do not exceed those previously reported