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Pacific Gas and <br /> Electric Company <br /> Technical and Ecological Services 3400 Crow Canyon Road <br /> San Ramon,CA 94583 <br /> 925.820.2000 <br /> March 7, 2001 <br /> Ms. Mary Serra <br /> California Regional Water Quality Control Board <br /> Central Valley Region 1, <br /> 3443 Routier Road; Suite A <br /> Sacramento, CA 95827-3003 ?� <br /> Re: First Quarter 2001 Groundwater Monitoring Report ; <br /> Pacific Gas and Electric Company's McMullin Gas Dehydrator Station, Manteca, CA 01� <br /> Dear Ms. Serra: <br /> Enclosed is the First Quarter 2001 Groundwater Monitoring Report for Pacific Gas and Electric Company's <br /> McMullin Gas Dehydrator Station. In August 1998, a compound formulated by Regenesis® called Oxygen <br /> Releasing Compound(or CIRC) was injected at this site to enhance biodegradation rates in the subsurface. <br /> The following is a summary of field and laboratory results performed in February 2001: <br /> • TPH-G, TPH-D, and BTEX were not detected in the samples collected from wells MW-3, MW-4, and <br /> MW-8. ' <br /> • Unknown diesel-range petroleum hydrocarbons were detected in the sample collected from well MW-1 <br /> at a concentration of 120 micrograms per liter(4g/L). <br /> • Early diesel-range hydrocarbons were detected in the samples collected from wells MW-2, MW-5, MW-6, <br /> and MW-7 at concentrations of 3600 gg/L, 410 gg/L, 2200 gg/L, and 2900 gg/L,respectively. <br /> • Unknown gasoline-range petroleum hydrocarbons were detected in the sample collected from well MW-5 <br /> at a concentration of 280 gg/L. <br /> • TPH-G was detected in the samples collected from wells MW-2, MW-6, and MW-7 at concentrations of <br /> 4000 gg/L, 6700 gg/L and 7100 gg/L, respectively. <br /> • Benzene was detected in the samples collected from wells.MW-2,MW-5, MW-6, and MW-7 at <br /> concentrations of 85 gg/L, 7.7gg/L, 270 gg/L, and 810 gg/L, respectively. <br /> • Toluene was detected in the samples collected from wells MW-2, MW-6, and MW-7 at concentrations <br /> of 58 gg/L, 78 gg/L, and 19 gg/L, respectively_ <br /> • Ethylbenzene was detected in the samples collected from wells MW-2, MW-6, and MW-7 at <br /> concentrations of 380 gg/L, 630 gg/L, and 440 gg/ , respectively. <br /> • Total xylenes were detected in the samples collected from wells MW-2, MW-5, MW-6, and MW-7 at <br /> concentrations of 880 gg/L, 6.1 gg/L, 1000 gg/L, and 850 gg/L, respectively. <br />