Laserfiche WebLink
I18 November 1999 <br /> AGE-NC Project No 95-0184 <br /> Page 4 of 4 <br /> r <br /> • Ground water is up to 24 feet above the screened interval in monitoring wells at the site <br /> IWells recharge rapidly, probably preventing significant drawdown during purging The <br /> hydrocarbon concentrations detected in these `drowned' wells may not be representative of <br />' shallower ground water where the maximum hydrocarbon impact would be expected k <br /> • Ground water is currently within the screened interval in one vapor well and near the top of <br /> the screened interval in two additional vapor wells The data collected from these wells <br />' should be representative of shallow ground water conditions in the immediate vicinity <br /> • The lateral extent of hydrocarbon-impacted soil at the site has not been delineated <br />' • MTBE was detected in two wells during the August 1999 monitoring event MTBE has been <br /> detected at significant concentrations during previous monitoring events, but may not have <br /> been detected in several wells due to high laboratory reporting limits - <br /> I <br /> 5.0. RECOMMENDATIONS <br />' Based upon data collected from the site AGE recommends the following <br /> g <br /> • A work plan is currently being prepared for a soil vapor extraction/in-situ air spaiging <br /> (SVE/IAS) pilot test The SVE/IAS test will be conducted to evaluate remediation options <br />' for this site Findings of the SVE/IAS test can be used to determine the spacings of potential <br /> additional vapor and sparging wells <br /> • Additional soil borings and monitoring wells should be installed to define the horizontal <br />' extent of hydrocarbon-impacted soil and ground-water Incorporating findings from the <br /> SVE/IAS test, a work plan addendum should be prepared updating the locations and depths <br />' of the proposed monitoring, extraction and sparging wells <br /> • The next ground water monitoring event will be scheduled for November 1999 <br />' S.O. LIMITATIONS <br />' Our professional services were performed using that degree of care and skill ordinanly,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 were made from a limited number of <br /> available,data points (i a monitoring wells), and,subsurface conditions may vary away from these <br /> data points No other warranty, expressed or implied, is made as to the professional <br />' recommendations contained in this report <br /> Advanced GeoEm3ronmental,Inc <br />