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16555 West Von Sosten Road, Tracy, California August 11, 1992 <br /> Lammersville School District Page 2 <br /> GROUNDWATER SAMPLING <br /> Groundwater monitoring wells MW-2, MW-5, MW-6, MW-9, and MW-10 were sampled in <br /> accordance with the Leakina Underaround Fuel_Tank Field Manual published by the State of <br /> California Leaking Underground Fuel Tank Task Force, dated October 1989 The samples were <br /> submitted to a state of California certified environmental laboratory under a chain of custody <br /> manifest All samples were analyzed for benzene, toluene, ethylbenzene, xylenes, and total <br /> petroleum hydrocarbons-as-gasoline (TPH-G) by modified Environmental Protection Agency <br /> methods 50301802018015 Copies of the laboratory analyses reports and chain-of-custody <br /> manifest are included in Attachment I <br /> GROUNDWATER ANALYTICAL RESULTS <br /> Dissolved TPH-G and benzene were detected in two monitoring wells Measurable concentrations <br /> of TPH-G ranged from 1,100 parts per billion (ppb) in MW-2 to 4,800 ppb in MW-6 Measurable <br /> benzene concentrations ranged from 16 ppb to 1,400 ppb The analytical data collected since May <br /> 1991 are summarized in Table 2 The plumes of dissolved TPH-G and benzene in the groundwater <br /> on July 29, 1992 are shown on Figures 2 and 3 <br /> Please contact Groundwater Technology's West Sacramento office if you have any questions or <br /> comments regarding this quarterly report <br /> Sincerely, <br /> Groundwater Technology, Inc Groundwater Technology, Inc <br /> Written/Submitted by Reviewed/Approved by <br /> SCOTT E GABLE, R E A E K ISIMONIS, R G <br /> Environmental Geologist Senior Environmental Geologist <br /> Project Manager ' <br /> SEGIEKS rc <br /> �y a <br /> Attachments <br /> 2124QTA2 LTA <br /> GROUNDWATER <br /> TECHNOLOGY <br />