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Quarterly Groundwater Monitoring Report, December, 1992--February, 1993 April 15, 1993 Manna Pro, 4004 South EI Dorado, Stockton, CA 3 Analytical results reported detectable concentrations of benzene, toluene, ethylbenzene, and xylenes (BTEX) Benzene concentrations ranged from below method detection limits (MDLs) in the samples from wells MW-8 and MW-9 to 27,000 micrograms per Inter (ag/1) in the sample from well MW-1 Concentrations of TPH-G ranged from below MDLs in the sample from well MW-8 to 110,000µg/I in the sample from well MW-1 Figure 2 illustrates the distribution of TPH-G in the groundwater using the February 3, 1993, analytical results Total dissolved lead was not detected in the samples collected this quarter Concentrations of TPH-G and BTEX have decreased in samples from wells MW-4, MW-5, and MW-6 and increased in samples from wells MW-1, MW-2, and MW-3 since the October 1992 sampling event The results of laboratory analyses are included in Attachment 2, Table 2 The laboratory analytical reports are included in Attachment 3 Groundwater Technology is pleased to be of service on this project If you have any questions or comments, please call any of the undersigned at (510) 671-2387 Sincerely, Groundwater Technology, Inc Groundwater Technology, Inc Written/Submitted by Reviewed/Approved by Deborah H Horner David R Kleesattel RED GF Staff Geologist Registered Geologi No 5136 �4-- DAVID R KlgSATrEL 1�Q 513$ Richard M TI omasser �Q Hydrogeologist Project Manager SOF CALX*C DHH RMT DRK ly Attachment 1 Figures Attachment 2 Tables Attachment 3 Laboratory Analytical Reports cc E Thayer, California Regional Water Duality Control Board, Central Valley Region Larry Chapman, Manna Pro Dean Willis, O'Melveney and Myers R2819A3 DHl GROUNDWATER LETECHNOLOGY, INC