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v <br /> March 12 , 1992 <br /> Mary Meays, EHS <br /> Environmental Health Division <br /> Public Health Services <br /> San Joaquin County <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> Mr. Boggs <br /> CVRQCB <br /> State of California <br /> 3443 Routier Road, Suite A i <br /> Sacramento, CA 95827-3098 <br /> RE: SITE CODE # 1828 <br /> SITE CONTAMINATION WORKPLAN <br /> BACKGROUND INFORMATION: <br /> On January 4, 1988 the underground storage tank located at <br /> 4648 E. Waterloo Road in Stockton was removed. The tank had <br /> been used as a gasoline storage tank by the tenants occupying <br /> the adjacent warehouse. Two tenants occupied the property up <br /> until the tank removal and both operated plumbing and sheet <br /> metal businesses on the premises and used the gasoline to <br /> fuel their company vehicles . This permitted tank of 550 <br /> gallons had recently passed a precision test and no visible <br /> leaks on the tank were noted during the routine. removal (see <br /> Exhibit A) . However, vapor odor on the site resulted in <br /> laboratory testing by Ramcon of Sacramento on 3-28-88 . The <br /> results of these tests indicated that contamination was <br /> present in the soil (benzene less than 500ppb, toluene <br /> 1000ppb, xylene 2000ppb, ethyl]�enzene less than 500 ppb, TPH <br /> 37 ppm, TPH-gas 40 ppm and total lead 74 ppm) . As a result <br /> of this information, a Unauthorized Release Report was filed <br /> by Harlan Knoll of the San Joaquin Public Health Services , <br /> Environmental Health Department (SJPHS/EHD) on 4-5-88 (see <br /> Exhibit B) . Since we, as the owner were not aware of any <br /> history of leaks, spills or repairs to the tank, the exact <br /> source of the contamination remains unclear. While the <br /> contaminating material based on test results appears to be <br /> gasoline, the quantity of liquid released into the soil is <br /> unknown. <br />