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' Gwg to eeal72d a lac. Page 11 <br /> Valley Wholesale Drag Company <br /> Project No 989 2 <br /> November 8,2004 <br /> The preliminary mass balance calculation, quantifying the amount MtBE remaining at the <br /> site, is included as Table 9 Roughly 0 075 gallons of MtBE remain beneath the VWDC site <br /> with approximately 0 041 gallons in the soil and approximately 0 034 gallons remaining in <br /> the groundwater <br /> ' 3.7 Remedial Technologies <br /> Other than natural attenuation, the original over excavation procedures and purging during <br /> well development and monitoring procedures, no formal remedial activities have taken place <br /> at the site <br /> ' <br /> Approximately 13 cubic yards of contaminated soil have been removed as drill cuttings <br /> pp Y <br /> during the installation of monitoring wells, soil borings and GeoProbe boreholes <br /> ' Approximately 500 gallons of contaminated groundwater per year are removed from the site <br /> dunng the development,purging and sampling of groundwater monitoring wells <br /> ' This volume of soil and groundwater removed during site investigation activities was not <br /> used to reduce the mass estimate of contaminants remaining at VWDC However, this is <br /> additional evidence of the conservative nature of the mass estimate calculations <br /> 3.8 BAT <br /> ' Since the tank and the primary soil contamination source have been removed, eventually <br /> background conditions will be achieved in the soil and groundwater at the site Excavation of <br /> the soil surrounding the former USTs and removal of soil boring cuttings are the only <br /> technologies employed to remediate the contamination detected at VWDC <br /> ' 3.9 Stockpiled Soil <br /> No stockpiled soil relating to the former underground storage tanks is stored on this property <br /> 3.10 Monitoring Wells <br /> Ten (10) monitoring wells are associated with this site and a well construction summary is <br /> included as Table 5 Upon issuance of a"No Further Action" letter from the CRWQCB, the <br /> monitoring wells will be properly abandoned under a SJCEHD permit <br /> Boring logs not used in generating this report may be found in <br /> • Hunter Interim Report Covering Soil and Groundwater Investigation—September, 1995 <br /> • Hunter Interim Report Covering Results of Site Investigaion Placement of SotUWater <br /> Probes—September 1998 <br /> E <br />