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Quarterly Groundwater Monitoring Report, January-March 1994 April 15, 1994 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 3 <br /> Samples from January 10, 1994, 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, and <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 38,000 micrograms per liter (ag/1) 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 /> and MW-9 to 160,000 micrograms per liter (a g/1) in the sample from well MW-1 Figure 2 illustrates <br /> the distribution of TPH-G in the groundwater using the January 10, 1994, analytical results Total <br /> dissolved lead was not detected in the samples collected this quarter Concentrations of TPH-G <br /> have increased in samples from wells MW-1, MW-2, MW-5, MW-6, MW-7, and MW-10 since the <br /> October 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, V►k INV k�Nr <br /> Groundwater Technology, Inc Groundwater T n ° M THO,� <br /> ritten/Submitted by Revs wed/Ap roved b <br /> 9�Nm <br /> Bob Fehr Richard T ma a <br /> Staff Geologist Registered E vironm I ssessor�' � <br /> No 05466 Q <br /> 4r� Op caLt�c¢�` <br /> For <br /> Frank J Gorry <br /> Vice President, Operations Manager <br /> National Industry Division <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 /> Dean Willis, O'Melveny and Myers <br /> 2819 RO14 070 <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />