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VtCESPUBLIC `fIEALTH SER <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> C/Fpft <br /> 445 N. San Joaquin Street 0 P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209)468-3420 <br /> KENNETH KAN <br /> CHEVRON USA PRODUCTS COMPANY <br /> P O BOX 5004 AUG 0 4 1994 <br /> SAN RAMON CA. 94583 <br /> RE: Chevron SITE CODE: 1388 <br /> 103 West Eleventh Street <br /> Tracy, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is the <br /> lead agency providing the oversight of the investigation and cleanup of releases from underground <br /> storage tanks within San Joaquin County. PHS/EHD has a contract with California State Water <br /> Resources Control Board to conduct an underground storage tank corrective action program. <br /> Section 25297.1(b) Chapter 6.7 of the Health and Safety Code provides PHS/EHD the authority <br /> to require an investigation and cleanup of unauthorized releases. The above referenced site was <br /> placed in the PHS/EHD Local Oversight Program (LOP) in January 1992. <br /> There is groundwater and soil contamination remaining at your facility. Water samples taken in <br /> the overexcavation after tank removal and water samples collected from the 3 on-site monitoring <br /> wells all indicate the presence of petroleum hydrocarbon contamination. Results of soil samples <br /> taken above groundwater in the northeast portion of the facility also reveal substantial residual <br /> soil contamination. <br /> PHS/EHD has reviewed the quarterly groundwater results for samples collected June 1, 1994. <br /> All 3 monitoring wells sampled contained concentrations higher than the previous quarter. <br /> Groundwater monitoring alone at this site is unacceptable as corrective action. Chevron must <br /> take a more active role to mitisate the conditions at this site. <br /> Accordingly, you are directed to submit a workplan to this office within 90 days from the date <br /> of this letter. The workplan shall include: <br /> 1. A proposal to further define soil and groundwater contamination. <br /> 2. A permit application for soil borings/monitoring wells. <br /> 3. A schedule for completion of the required work. <br /> A Di%Mon of San Joaquin County Health Care Service~ <br />