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Mr Kyle Christie Project 20805-144 004 <br /> July 26, 1996 <br /> Page 6 <br /> Because the base of the former UST complex was 14 feet bgs and the shallow depth to <br /> water recorded during quarterly monitoring was 50 feet bgs, D is 36 feet or 12 yards The <br /> equation becomes <br /> Vhc = D*ARC/1000 <br /> Vh, = 12*(900)(25)(0 5)11000 �11I cl 5)C <br /> Vh, = 135 barrels or 5940 gallons <br /> Therefore, a release of approximately 5,900 gallons at the base of the former UST <br /> complex would be required to overcome the hygroscopic and capillary properties of soil <br /> and migrate to groundwater <br /> Based on the lateral and vertical extent of TPHG and BTEX impacts in soil, the magnitude <br /> of the concentrations detected during site characterization activities, and the stratigraphic <br /> controls on nugration of hydrocarbons present beneath the site, the residual hydrocarbon <br /> concentrations do not appear to represent a threat to groundwater at this site The <br /> groundwater analytical results obtained over the duration of quarterly monitoring supports <br /> this conclusion In addition, it is possible that biodegradation processes occurring within <br /> site soils have reduced the petroleum hydrocarbon concentrations detected in 1992 by <br /> approximately 52 percent <br /> It does not appear that the site represents a threat to groundwater, therefore, EMCON is <br /> recommending site closure be considered and the quarterly groundwater monitoring <br /> program be discontinued <br /> LIMITATIONS <br /> The services described in this report were performed consistent with generally accepted <br /> professional consulting principles and practices No other warranty, expressed or implied, <br /> is made These services were performed consistent with our agreement with our client <br /> This report is solely for the use and information of our client unless otherwise noted Any <br /> reliance on this report by a third party is at such party's sole risk <br /> Opinions and recommendations contained in this report apply to conditions existing when <br /> services were performed and are intended only for the client, purposes, locations, time <br /> frames, and project parameters indicated We are not responsible for the impacts of any <br /> changes in environmental standards, practices, or regulations subsequent to performance <br /> of services We do not warrant the accuracy of information supplied by others, nor the use <br /> of segregated portions of this report <br /> SACUC\08051440 DOC-9W= <br />