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Quarterly Groundwater Monitoring Report, October-December 7993 January 14, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 3 <br /> Samples from October 27, 1993, sampling event were analyzed by the laboratory for <br /> ■ Aromatic volatile organics and total petroleum hydrocarbons-as-gasoline (TPH-G) <br /> using Environmental Protection Agency (EPA) Methods 5030 and 8020 and modified <br /> EPA Method 8015, <br /> ■ Total dissolved lead using EPA Method 7421 <br /> Analytical results reported detectable concentrations of benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX) Benzene concentrations ranged from below method detection limits (MDLs) in the samples <br /> from wells MW-4, MW-8, and MW-9 to 19,000 micrograms per liter (µg/I) in the sample from well <br /> MW-1 Concentrations of TPH-G ranged from below MDLs in the samples from wells MW-4, MW-8, <br /> MW-9, and MW-10 to 64,000 (ug/1) in the sample from well MW-1 Figure 2 illustrates the <br /> distribution of TPH-G in the groundwater using the October 27, 1993, analytical results Total <br /> dissolved lead was not detected in the samples collected this quarter Concentrations of TPH-G <br /> have decreased in samples from wells MW-1, MW-2, MW-3, MW-5, MW-6, MW-7, and MW-10 since <br /> the July 1993 sampling event The results of laboratory analyses are included in Table 2 The <br /> laboratory analytical reports are included in Attachment 3 <br /> Groundwater Technology is pleased to be of service on this project If you have any questions or <br /> comments, please contact our Concord office at (510) 671-2387 <br /> Sincerely, <br /> Groundwater Technology, Inc Groundwater Technology, Inc <br /> S r e Reviewed/Approved by <br /> Bob Fehr David R Kleesattel ��gcD GAO <br /> Staff Geologist Registered Geologist �0 �O <br /> No 5136 - <br /> DAWI)it.l(!EFSATi�t � <br /> Richard T omasser NO 513$ <br /> Hydrogeologist/ <br /> Project Manager <br /> F of c A��Fo <br /> PR R-7-- <br /> Attachment 1 Figures <br /> Attachment 2 Tables <br /> Attachment 3 Laboratory Analytical Reports <br /> cc E Thayer, California Regional Water Quality Control Board, Central Valley Region <br /> Larry Chapman, Manna Pro <br /> Dears Willis, O'Melveny and Myers <br /> ' 2819RO43 070 <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />