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STATE OF CALIFORNIA-Environmental Protec*Agency • PETE WILSON Governor CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ukimumei 3443 Routier Road,Sufte A Sacramento,CA 95827-3098PHONE: (916)255-3000 FAX:(916)255-3015 6 June 1996 Mr. John Welch Attorney at Law 3620 West Hammer Lane, Suite B Stockton, CA 95219 SOIL AND GROUND WATER INVESTIGATION AND CLEANUP, INDEPENDENT TRUCKING FACILITY, 1145 WEST CHARTER WAY, STOCKTON,SAN JOAQUIN COUNTY We have reviewed the 8 May 1996 First Quarter 1996 Ground Water Monitoring Report and Results of Soil Probe Work prepared by William Hunter& Associates for the Independent Trucking facility in Stockton. The report presents the results of soil and ground water sampling from 10 geoprobe-type"borings" and the five ground water monitoring wells at the site. The results show that much of the soil contamination found is near the capillary fringe as a smear zone caused by contaminated ground water. The known sources of contamination are the former underground diesel tanks and associated piping, a former underground waste oil tank, former aboveground diesel tanks, and a former underground septic tank used for disposal of oily wastes. The Nomellini property to the east is a likely source for the gasoline contamination found in the ground water below the eastern part of the Independent Trucking site. An unknown source of gasoline has contributed to the contamination found below the western portion of the Independent Trucking facility. Based on the data obtained so far, it is clear that further work needs to be done in order to fully define the extent of contamination and begin implementing remedial measures. Ms. Linda Turkette of the San Joaquin County Department of Public Health Services has advised us that a vapor extraction/air sparging system will begin operating this summer at the Nomellini property to begin remediating contamination at that site. However, it is unclear whether the new system's capture zone will extend onto the Independent Trucking property. San Joaquin County is the lead regulatory agency for the Nomellini cleanup. Although the approved 5 December 1995 Work Plan for Additional Site Investigation called for at least four additional monitoring wells on the Independent Trucking site, these wells were not installed. Mr. Hunter believes that these wells are not necessary, but we disagree with this. The 5 December Work Plan also stated that Independent Trucking was in the process of obtaining a trespass agreement with the owner of the property to the west so that soil/water probes could be placed on that site, if deemed necessary. Because the samples taken from the western boundary of the Independent Trucking facility were contaminated with gasoline and other petroleum products, it is clear that investigation onto the property to the west would have been appropriate, but this did not occur.