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l <br /> � y <br /> if FUGRO WEST, INC. _ ______ �___ _ ----- _ �•. <br /> 1050 Melody Lane,Suite 160 <br /> Roseville,California 95678 <br /> March 5, 1996 Tel (916)782-2110 <br /> Project No 9347-1044 FAX (916)786-7830 <br /> Ms Marla Guensler <br /> Exxon Company, U S A <br /> 2300 Clayton Road, Suite 640 <br /> Concord, California 94524 <br /> Subject First Quarter 1996 Ground Water Monitoring Report •� t�Q� <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 Januar 26� _ _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 /> Figures 5, 6, and 7 show, respectively, the total amount of hydrocarbons extracted, the <br /> hydrocarbon extraction rate, and the hydrocarbon concentration in the soil vapor extracted from <br /> the site by the catalytic oxidizer system <br /> The wells that are currently being used for soil vapor extraction are VEW-1 and VEW-2 <br /> Wells MW-2, MW-3, and MW-5 were taken off-line because of their relatively minor <br /> contribution to the total hydrocarbon extraction rate due to low concentrations Continued <br /> monitoring and optimization of the vapor extraction process will be performed The operational <br /> data will be updated and presented in the subsequent quarterly ground water monitoring reports <br /> Copies of this report should be forwarded to <br /> Mr Michael Infurna 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 /> 9347-10440 QMR A member of the Fugro group of companies with offices throughout the world <br />