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Quarterly Groundwater Monitoring Report, July-September 1994 3 <br /> Manna Pro, 4004 South EI Dorado, Stockton, CA October 14, 1994 <br /> Samples from the July 14, 1994, sampling event were analyzed by the laboratory for <br /> • aromatic volatile organics and total petroleum hydrocarbons as gasoline (TPH-g) using <br /> Environmental Protection Agency (EPA) Method 8020 and gas chromatography/flame- <br /> ionization detector (GC-FID), respectively <br /> • total dissolved lead using EPA Method 7421 <br /> Analytical results indicated detectable concentrations of benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX) Benzene concentrations ranged from below method detection limas (MDLs) in the <br /> samples from wells MW-4, MW-8, and MW-9 to 31,000 micrograms per liter (ug/L) in the sample from <br /> well MW-1 Concentrations of TPH-g ranged from below MDL in the sample from well MW-4 to <br /> 110,000ptg/L in the sample from well MWA Figure 2 illustrates the distribution of TPH-g in the <br /> groundwater using the July 14, 1994, analytical results Total dissolved lead was not detected in the <br /> samples collected this quarter Concentrations of TPH-g have increased in samples from wells MW-4, <br /> MW-7, and MW-10 since the April 1994 sampling event and either have decreased or remained the same <br /> in samples from wells MW-1, MW-2, MW-3, MW-5, MW-6, MW-8, and MW-9 The results of laboratory <br /> analyses are included in table 2 The 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 call our Concord office at (510) 671-2387 <br /> Sincerely, >)*' A A <br /> Groundwater Technology, Inc. SNVIRON.ils,A-Qa Groundwater T o y, <br /> bmi a <br /> �$e <br /> o M TN0�-"'V roved by <br /> Q' �+ <br /> AI <br /> u .r <br /> Bob Fehr w¢ NO 05466 Mx ichard KA oma r <br /> Staff Geologists Registered vironme I Assessor <br /> Expires, No 05466 <br /> OR' cALtfFor <br /> Frank J Gorry <br /> Vice President, Operations Manager <br /> National Industry Division <br /> c E Thayer, California Regional Water Quality Control Board, Central Valley Region <br /> Larry Chapman, Manna Pro <br /> Dean Willis, O'Melveny and Myers <br /> Attachments <br /> 1 Figures <br /> 2 Tables <br /> 3 Laboratory Analytical Reports <br /> 00968024 202 <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />