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Fourth Quarter Status Report for 1992 November 13, 1992 <br /> • Lammersville School District, 16555 West Von Sosten Road, Tracy, CA 2 <br /> Groundwater Sampling <br /> Groundwater monitoring wells MW-2, MW-5, and MW-6 were sampled according to the Leakin <br /> Undercrround Fuel Tank Field Manual published by the State of California Leaking Underground Fuel <br /> Tank Task Force, dated October 1989 The samples were submitted to a Caldornia-certified <br /> environmental laboratory under a chain-of-custody manifest All samples were analyzed for benzene, <br /> toluene, ethylbenzene, xylenes, and total petroleum hydrocarbons-as-gasoline (TPH-G) by modified <br /> Environmental Protection Agency (EPA) Methods 5030/8020/8015 Copies of the laboratory <br /> analyses reports and chain-of-custody manifest are Included in Attachment 3 <br /> Groundwater Analytical Results <br /> Dissolved TPH-G and benzene were detected in two monitoring wells Measurable concentrations of <br /> TPH-G ranged from 1,700 parts per billion (ppb) in the water sample from MW-2 to 2,700 ppb in the <br /> sample from well MW-6 Measurable benzene concentrations ranged from 3 3 ppb to 630 ppb The <br /> analytical data collected since May 1991 are summarized in Attachment 2, Table 2 The plumes of <br /> dissolved TPH-G and benzene in the groundwater on October 7, 1992, are shown in Figures 2 and 3 <br /> (Attachment 1) <br /> • Please contact Groundwater Technology's Concord office if you have any questions or comments <br /> regarding this quarterly report <br /> Sincerely, <br /> GROUNDWATER TECHNOLOGY, INC <br /> avid R Kleesattel, R G 0 <br /> 0 <br /> District Hydrogeologcst N <br /> DAViO R KLIESATML <br /> DRI(ab NO 5138 � <br /> N� �Q <br /> Attachment 1 - Figures <br /> Attachment 2 - Tables `c OF CAU <br /> Attachment 3 - Laboratory Reports <br /> R2124A1 DRK <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />