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1386 EAST BEAMER STREET <br /> WE ESTERN WOODLAND, CA 95776-6003 <br /> GEO ENGINEERS FAX (916) 662-0273 <br /> CALIF CONTRACTOR #513857 A CORPORATION (916) 668-5300 <br /> REGISTERED GEOLOGISTS <br /> July 14, 1994 <br /> Mr John Margowski <br /> P O Box 13648 <br /> Sacramento, CA 95853-4648 <br /> (916) 978-2500 <br /> RE MODELING OF CURRENT SOIL CONCENTRATIONS AT REGAL 604 <br /> Dear Mr Margowski <br /> Western Geo-Engineers performed our latest sampling of the vapor <br /> extraction system at Regal 604 on July 12 , 1994 <br /> The information from this sampling was used to calculate the <br /> amount of hydrocarbons recovered since the restarting of the <br /> system on February 16, 1994 The system had recovered 18191 <br /> pounds before the system was restarted, as of July 12 the system <br /> has recovered 18315 pounds total or 124 pounds since the system <br /> was restarted The system recovered this 124 pounds in 146 days <br /> giving an average daily recovery of 0 85 pound per day The <br /> amount of gasoline recovered was used to model the current <br /> expected ground water impacted of the contamination remaining in <br /> the soil as of July 12 , 1994 <br /> The initial amount of gasoline left in the soil as of February <br /> 16 , 1994 was estimated at 531 pounds The amount removed by vapor <br /> extraction was 124 pounds, therefore (531-124) = 407 pounds of <br /> gasoline should remain in the soil or 407/531 x 100 = 76 6 <br /> percent of the original concentration <br /> In order to determine the current predicted ground water impact <br /> of the remaining soil contamination, vleach was run after <br /> adjusting the February soil concentrations to reflect the <br /> recovery by vapor extraction The gasoline impact over 100 years <br /> was broken into ten 10 year periods and the hydrocarbon <br /> concentrations for the zn]ected fluids were then computed for <br /> each polygon during each period Bioplume was then utilized to <br /> predict the expected gg/l , ground water concentrations During <br /> the 100 years modeled, the predicted gasoline concentration in <br /> the ground water never reach 1 ppb <br /> If you have any questions on the above please contact me at <br /> (916) 668-5300 <br /> Sincerely <br /> idq"e' <br /> Routale r <br /> Geologist <br /> 1 <br />