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0 <br /> Advanced <br /> GeoEnvironmental, Inc. 0=- <br /> 10 December 2001 <br /> AGE-NC Project No. 97-0333 <br /> Mr. Jeff Wong R E '" E N E D <br /> San Joaquin County Public Health Services-Environmental Health Division DEC 2 0 2001 <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Subject: Interim Remediation-Free Product <br /> RAINWATER CAR WASH <br /> 420 West Yosemite Avenue,Manteca, California <br /> Dear Mr. Wong: <br /> At the request of Mr.Phil Elder of Rainwater Car Wash,Advanced GeoEnvironmental Inc.(AGE)performed <br /> quarterly ground water monitoring of wells MW-1 through MW-6 and EW-1 at the above referenced site on <br /> 04 December 2001. During monitoring activities,AGE encountered approximately 6 to 12 inches of a dark- <br /> colored,unknown floating product in wells MW-2,MW-6 and EW-1. <br /> As an interim remediation measure to address the unknown floating product, AGE will be performing daily <br /> purging at the site on wells MW-2,MW-6 and EW-1 with disposable bailers; daily purging procedureswill <br /> continue until floating product is less than an inch-thick. Thereafter, AGE recommends deploying passive <br /> skimmers inside wells MW-2 and MW-6 until floating product is no longer visible. <br /> Due to the uncertainty of the dark-colored floating product,AGE recommends that at least one grab sample <br /> of the floating product be collected for further characterization; at a minimum, laboratory analysis should <br /> consist of a fuel-fingerprint utilizing EPA Method 8015M and halogenated volatile organics by EPA Method <br /> 8010. Due to substantial previous detections of hexachlorabutadiene and 1,23-trichlorobenzene at MW-2, <br /> AGE has been informed by McCampbell Analytical that this occurrence is sometimes associated with <br /> polychlorinated biphenols (PCBs) impact.Therefore, AGE recommends that analysis of PCBs should be <br /> performed by EPA Method 8080 as part of this characterization. If you should have any further questions, <br /> please contact the undersigned at(209)467-1006. <br /> Sincerely, <br /> Advanced GeoEn�vironmental, Inc. <br /> � k ( <br /> Timothy VCuelfar <br /> Project Geologist <br /> cc: Mr. Phil Elder, Rainwater Car Wash <br /> Mr. Marty Hartzell, California Regional Water Quality Control Board <br /> 837 Shaw Road;Stockton, California 95215 <br /> Telephone(209)467-1006 FAX(209) 467-1118 <br />