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f <br /> C A M B R I A Mr. Ron Rowe <br /> July 12, 2000 <br /> Groundwater Remediation: Cambria designed and installed a groundwater extraction (OWE) <br /> and treatment system. The GWE system, which extracts groundwater from well EW-1 at <br /> approximately 5 gallons per minute (gpm), was started on March 10, 2000. In order to comply <br /> with the requirements of the City of Ripon, the GWE system began pumping water through the <br /> filters and into an onsite storage tank. When the first tank was full, the system was switched over <br /> to pump directly into a second tank without filtration. The water from the second tank was <br /> hauled to the Shell refinery in Martinez, California for disposal. <br /> ANTICIPATED SECOND QUARTER 2000 ACTIVITIES <br /> Groundwater Monitoring: Blaine will gauge and sample all wells and tabulate the data. All <br /> samples will be analyzed as followes: <br /> • Total petroleum hydrocarbons as gasoline by EPA Method 8015, <br /> • Benzene, toluene, ethylbenzene, total xylenes, and methyl tert-butyl ether (MTBE) <br /> by EPA Method 8020, <br /> • 1,2-dibromomethane and 1,2-dichloroethane by EPA Method 8010, <br /> • Ethanol, tert-butyl ether, MTBE, di-isopropyl ether, ethyl tert-butyl ether, and <br /> tert-amyl methyl ether by EPA Method 8260,and <br /> • The industrial solvent methanol by EPA Method 8015. <br /> Cambria will prepare a monitoring report. <br /> Groundwater Remediation: Cambria will continue operating the GWE and treatment system. <br /> Upon approval from the City of Ripon, the system will begin continuous discharge to the sanitary <br /> sewer system. <br /> t� <br /> 2 <br />