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California Regional Water. Quality Control Board <br /> Central Valley'Region �� ..,,' <br /> Steven T.Butler;Chair Grav Davis <br /> Winston H.Hickos <br /> Secretaryjor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAx(916)255-3015 - <br /> 7 February 2000 <br /> Ms. Margaret Lagorio <br /> Senior Registered Environmental Health Specialist <br /> Sq Y <br /> San Joaquin Count Environmental Health Division <br /> 304 East Weber Avenue <br /> Stockton, CA 95202 <br /> NONCONCURRENCE WITH SAN JOAQUIN COUNTY'S NO FURTHER ACTION REQUIRED <br /> DETERMINATION,TRACY COLD STORAGE,24500 SOUTH MAC ARTHUR ROAD,TRACY <br /> Board staff reviewed San Joaquin County Environmental Health Division's(County) Case Closure <br /> Summary for Tracy Cold Storage, and the 7 September 1999 Case Closure Request with addendum <br /> prepared by American Geological Services. Board staff do not concur with the closure request. <br /> Monitoring wells MW-IA and MW-6 define.a shallow plume of hydrocarbons in groundwater. Two <br /> water supply wells are located within the plume. Protection of these water supply wells depends on the <br /> ability of the reported aquitard and.the water supply wells to prevent downward migration of benzene. <br /> One of the water supply wells, known as the North Well, was constructed in 1984. We've been assured <br /> that the construction of the North Well is sufficient to prevent downward migration of contaminants. <br /> However, we have no information on the South Well, which was constructed much earlier. Because <br /> older wells were frequently constructed without sanitary seals and with perforations at various water <br /> bearing horizons, a demonstration that the South Well isnot a conduit for contamination to reach the <br /> lower aquifer, must be made. <br /> For our concurrence with the closure request, Tracy Cold Storage must provide South Well construction <br /> information, which demonstrates that the underlying water supply is adequately protected. <br /> If you have any questions,please call Marty Hartzell at (916) 255-3115. <br /> ARY CARLTON <br /> Executive Officer <br /> Enclosures (NFAR checklist, Memo) <br /> California Environmental Protection Agency <br /> �a Recycled.Paper <br />