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e r <br /> i <br /> FUGRO WEST, INC. - <br /> 1050 Melody Lane, Suite 160 <br /> January 4, 1996 Roseville California95678 <br /> Tel (916)782 2110 <br /> Project No 9347-1044 t FAX (916)786 7830 <br /> 1" ;�l <br /> Ms Marla Guensler �:R0 <br /> Exxon Company, U S A 2300 Clayton Road, Suite 640 �' ---- G1,Concord, California 94524 Co-,4EN, L-.NG <br /> Subject Foulith Quaitei• 1995 Ground Watei Monitonng Report <br /> Exxon Station RAS No. 7-0137 <br /> 1605 South El Dorado Street, Stockton, California <br /> Dear Ms Guensler <br /> This report documents the results of quarterly ground water monitoring conducted at the <br /> subject site (Figures 1 and 2) on October 20, 1995 Ground water elevations are shown in <br /> Table 1 and a potentiometric surface map is included as Figure 3 Analytical results are <br /> summarized in Table 2 and the distribution of benzene in ground water is shown on Figure 4 <br /> Standard operating procedures and laboratory reports are included as attachments <br /> A soil vapor extraction system began operation on November 13, 1995 The system is <br /> comprised of a vacuum blower and a catalytic oxidizer The oxidizer is heated electrically and <br /> destroys hydrocarbon vapors being extracted from the site <br /> The initial concentrations of hydrocarbon vapors being removed from the site ranged <br /> from 5,700 to 6,000 parts per million by volume (ppinv) The air flow was determined to be <br /> about 38 standard cubic feet per minute Thus, the initial extraction rate is about 65 pounds of <br /> hydrocarbons per day <br /> The wells that are being used for soil vapor extraction are VEW-1, VEW-2, MW-2, <br /> MW-3, and MW-5 Continued monitoring and optimization of the vapor extraction process will <br /> be performed The operational data will be updated and presented in the subsequent quarterly <br /> ground water monitoring reports <br /> Copies of this report should be forwarded to <br /> Mr Michael lnfurna Ms Elizabeth Thayer <br /> Public Health Services of San Joaquin County Central Valley Regional Water Quality <br /> Environmental Health Division Control Board <br /> 445 North San Joaquin Street 3443 Routier Road, Suite A <br /> Stockton, California 95202 Sacramento, California 95827-3098 <br /> 9347-1044N QMR <br /> A member of the Fugro group of companies with offices throughout the world <br />