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I r analysis of TPH and BTE&X Vacuum pressure at monitoring well MW-1 was also r measured to determine whether the extraction system would influence soil at a distance of 30 feet from VW-1 r Vapor concentrations exceeded the upper Iimit of measurement of the instrument (10,000 ppm) over the enure duration of the test These high readings were confirmed by laboratory analysis of vapor samples (Table 4) The laboratory report is presented as Attachment C I 7.0 CONCLUSIONS AND RECOMMENDATIONS Groundwater contamination at this site has fluctuated in MW-2 and MW-3 over the past several months, but now appears to be decreasing Contamination in MW-1 has continued. I to diminish since the initial sampling in January of 1993 GeoAudit recommends continued groundwater monitoring, but does not recommend groundwater remediation at this time I GeoAudit iecommends that the seven remaining drums of contaminated soil be spread on plastic and allowed to aerate Removal and replacement of the underground storage tanks at the site are scheduled for February 1994 GeoAudit has solicited bids from three contractors to remove and replace the underground storage tanks at the site, but they have requested more detailed information from the clients regarding equipment requirements before submitting bids Removal plans will be submitted after this information has been transmitted and a bid has been accepted It appears unlikely at this time that a removal plan will be submitted in time to meet the February 1994 schedule for tank replacement The results of the vapor extraction test indicate that high concentrations of hydrocarbon vapors are present in the vadose zone in the vicinity of the northern dispenser island, and that subsurface conditions there are highly suitable to effective remediation by vapor extraction technology Other remediation techniques are likely to be sunilarly effective, due to high porosity_and permeability within the contaminated zone The test did not provide conclusive data on the radius of influence of VW-1 T I 8.0 LIMITATIONS nil; rPnnrt rC limitPrl in crnna- n fiill rPnnrt will he cnhmitted iinnn cite assessment Our professional services were performed using that degree of care and skill ordinarily exercised by environmental consultants practicing in this or similar localities The findings wei a based upon analytical results provided by an independent laboratory No other warranty, expressed or implied, is made as to the professional recommendations contained in this repoi t i 8/5LT2 93/.grmMioJ.lari