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PUBLIC AEALTH SERVICES ,oun SAN JOAQUIN COUNTY w ?, ENVIRONMENTAL HEALTH DIVISION Karen Furst, M.D., M.P.H., Health Officer c 304 East Weber Avenue, Third Floor- Stockton, CA 95202 FILE P 2091468-3420 WALTER SHOCREY CIO LEE SHOCKEY APR 2 11999 117 GOODAI.E COURT MANTECA CA 95337 Re: Shockey Trucking SITE CODE: 2581 850 Milgeo Ripon Ca 95366 San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) is the lead agency providing the oversight of the investigation and cleanup of releases from underground storage tanks (UST's) within San Joaquin County. PHS/EHD has a contract with California State Water Resources Control Board to conduct an underground storage tank program. The above referenced site was placed in the PHS/EHD Local Oversight Program (LOP) in July 1994. On August 4, 1998, PHS/EHD met with you and your consultant, Advanced GeoEnvironmental, Inc., to review the investigation and remedial activities for the above referenced site. We reviewed site history, the findings from the investigation, and analytical results from monitoring events. In April 1994, six USTs were removed from three separate excavations on the above referenced site; one waste oil UST, one diesel UST, and four unleaded gasoline USTs. An unauthorized release was reported in the area of the former diesel UST. PHS/EHD gave a directive to perform additional investigation and any necessary corrective action to mitigate the release. A soil and groundwater investigation has been performed. In December 1995, five soil probe borings were advanced on site. In June of 1996, four monitoring wells (MW) were installed; three.on site and one off site. Groundwater contamination was documented. Free phase diesel has been observed in the MW-4 on site. Gasoline and diesel have been documented off site in MW-1. The full extent of groundwater contamination has not been defined in the direction of MW-1. A well survey was conducted in June of 1997.-Three wells were identified in the survey. All three wells were constructed with a 50-foot sanitary seal and gravel packed. One well is within 350 feet southwest of the site at a private residence. Boring logs and soil sample results indicate contamination exists as deep as 25 feet below ground surface. You are directed to fully define the vertical and lateral extent of soil and groundwater contamination and perform feasibility studies to evaluate remedial alternatives for cleanup. After the feasibility study is completed, you are required to submit a Corrective Action Plan by August 1, 1999. A Division of San Joaquin Counry Heafch Care Services