SITE INFORMATION AND CORRESPONDENCE

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lkw� u PUBLIC HEALTH SERVICES SAN JOAQUIN COUNTY ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer 304 E. Weber Ave., Third Floor • R O. Box 388 • Stockton, CA 95C 209/468-3420 BETH BRITTAIN BUSINESS AND PROFESSIONS BANK 1440 ETHAN WAY MED JUL15 19% SACRAMENTO CA 95825 RE: RANU10 PROPERTY 1789 W CHARTER WAY STOCKTON CA San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) is pleased to provide this letter regarding the status of the cleanup of the release from the underground storage tanks formerly located at the above noted address. The underground storage tanks formerly located on this property were abandoned in place in 1981. After Mark Ranuio purchased the property, he took the appropriate action to remove the tanks and abate the release from the tank by investigation and subsequent soil excavation. In 1990, the soil excavation activities were successful in removing the bulk of the impacted soil from the area of the former tank pit. The excavated soil was remediated by aeration and was subsequently put back into the excavation. Recently, soil borings were installed to groundwater at the site which revealed groundwater contamination in the area of the former excavation. Additional soil borings and groundwater monitoring wells show the extent of this contamination to be very limited in scope, laterally and vertically. As the source (the impacted soil) was already addressed in 1990, the remaining limited groundwater contamination will likely degrade by natural processes. This has been documented to be the case in many studies now under review by the State Water Resources Control Board (SWRCB), and has been demonstrated to occur at sites within San Joaquin County. Currently, new state water quality policy is being drafted to address this degradability characteristic of petroleum. In the interim, the SWRCB has provided guidance to agencies in assessing low risk sites and has requested that active remediation at these sites be replaced with monitoring to establish if the plume is stable and capable of natural degradation processes. In addition, several legislative changes are expected in the next year that will also impact the manner and scope by which petroleum sites are investigated and remediated. Based on written and verbal guidance from the SWRCB, the plan of action for this site is to gather physical data from the site to demonstrate that the remaining plume is stable and/or declining in size and is in an environment capable of sustaining biological degradation of petroleum. As the levels of contamination are likely to reduce to background and/or beneficial use levels at some time in the future and it can be demonstrated that current and future probable beneficial uses are protected during this time period, further regulatory oversight for this release is not warranted. In addition, an important factor at this site is the knowledge and understanding that the plume has not moved significantly in the past 15 years, the last possible time a release could have occurred from the tanks. This "real fife" fate and transport data only confirms and substantiates that natural processes are at work at this site. Most of the data discussed above has been gathered from the site and is currently being compiled into a report of findings. This report will contain a closure recommendation for this site. A Division of San Joaquin County Health Care Services