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• Lammersville School District, 16555 West Von Sosten Road, Tracy, California May 18, 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 Leakma Underground 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 5030/8020/8015 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 1,400 parts per billion Ippb) in MW-2 to 8,100 ppb in MW-6 Measurable <br /> benzene concentrations ranged from 0 89 ppb to 730 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 April 7 are shown on Figures 3 and 4 <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 SIMONIS, R G <br /> Environmental Geologist Senior Environmental Geo <br /> Project Manager <br /> klE D) <br /> SEG/EKS rc .;''�G 'r�` rs <br /> = q <br /> Attachments �p 4e}22 <br /> 21240TR2LTR <br /> u <br /> F <br /> �fi OF C - <br /> aW GROUNDWATER <br /> __, TECHNOLOGY <br />