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Quarterly Groundwater Monitoring Report,January-March 1995 3 <br /> Manna Pro, 4004 South El Dorado, Stockton, CA April 17, 1995 <br /> Samples from January 30, 1995, 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 <br /> chromatography/flame-ionization detector (GC/FID), respectively <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-10 to 25,000 micrograms per liter (Ng/L) in the sample from well <br /> MW-1 Concentrations of TPH-g ranged from below MDL in the sample from wells MW-4 and MW-8 <br /> to 110,000,ug/L In the sample from well MWA Figure 2 illustrates the distribution of TPH-g in the <br /> groundwater using the January 30, 1995, analytical results Total dissolved lead was not detected In <br /> the samples collected this quarter Concentrations of TPH-g have increased in samples from wells <br /> MW-3 and MW-9 since the October 1994 sampling event The results of laboratory analyses are <br /> included in table 2 The laboratory analytical reports are included in attachment 3 <br /> Groundwater Technology is pleased to be of service on this protect 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 /> Written/Submitted by Reviewed/Appr <br /> /bob Fenr Richard M' Thpmasse <br /> Staff Geologist Registered En ronmenta ssessor <br /> No 05466 <br /> For <br /> Frank J Gorry <br /> Vice President, Operations Manager <br /> National Industry Division <br /> c Larry Chapman, Manna Pro <br /> Dean Willis, O'Melveny and Myers <br /> Attachment <br /> 1 Figures <br /> 2 Tables <br /> 3 Laboratory Analytical Reports <br /> 0098R M zo2 <br /> HEl GROUNDWATER <br /> E19 TECHNOLOGY, INC <br />