SITE INFORMATION AND CORRESPONDENCE

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PUBLIC HEALTH SERVICYS oPQ N..c SAN JOAQUIN COUNTY r wj ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer P 304 East Weber Avenue, Third Floor - Stockton, CA 95 COP Y 209/468-3420 BOB SINGH CKE RESTAURANTS MAY 181999 P O BOR 4349 ANAHEIM CA 92803-4349 RE: CKE DISTRIBUTION CENTER SITE CODE: 1686 800 MELLON AVE MANTECA CA 95337 San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the file for the above referenced site and has the following comments for your consideration and action. On November 17, 1998 two underground storage tanks (UST's) were removed under permit and inspection from the above referenced site. Both tanks had been used to store diesel fuel. UST#1 was a 10,000-gallon tank, and UST#2 was a 550-gallon tank. Soil samples were collected from beneath UST#1 at a depth of 15 feet below surface grade (bsg), from beneath UST#2 at a depth of 12 feet bsg and from the stockpiles of excavated soil. Soil samples were analyzed for total petroleum hydrocarbons as diesel (TPHd), and benzene, toluene, ethylbenzene and xylene (BTEX). Analytical results of the soil samples were non-detect for all three tank pit samples, but evidenced levels of TPHd up to 15,000 parts per million (ppm) in the stockpiles. Although groundwater was anticipated to be approximately 10 feet bsg, it was not encountered during this operation and therefore could not be sampled. During the tank removal the PHS/EHD inspector on site noted stained soils in the UST #1 dispenser area. This area was not sampled at the time of the UST removal because the length of product piping was less than 20 feet. During a routine inspection conducted on January 15, 1997 an unauthorized release was discovered in the UST#1 tank system. This leak was found to have been caused by a faulty 'O'ring in the turbine manifold, and was subsequently repaired. This area will require further investigation. During the tank removal the piping lines to UST#2 were not sampled due to the physical constraints of the site. The piping lines were closed in place on November 18, 1998 and notation made that samples from beneath the lines would need to be collected before the tank closure can be completed. This sampling remains to be done. Please submit to PHS/EHD a work plan to complete the required piping sampling for UST#2, and to begin the investigation of the lateral and vertical extent of potential petroleum hydrocarbon contamination in soil and groundwater at this site. Include in the work plan a well survey that shows the locations of all domestic, industrial, agricultural, municipal and other well within a 2000 foot radius of the site. The construction of these wells, if known, should be included. A Division of San Joaquin County Health Care Services