SITE INFORMATION AND CORRESPONDENCE_FILE 1

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a r 7� PUBLIC HEALTH SERVICES SAN JOAQUIN COUNTY z` JOGI KHANNA M.D.,M.P.H. Health Officer P P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 c4�i Foa`�� (209) 468-3400 JOHN AND MARGARET MARCI CC MARCIS DIESEL SERVICE 2973 LOOMIS ROAD OCT 0 5 1992 STOCKTON CA 95205 RE: 2969 Loomis Road SITE CODE: 2015 Stockton, Ca San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the letter response submitted by William Hunter and Associates, dated September 1, 1992, and has the following comments. The laws and regulations that govern the assessment and cleanup of sites impacted by petroleum hydrocarbon releases from underground storage tanks are in part to protect human health. In addition to protecting human health, the State of California has mandated that, as a limited and precious resource, all waters of the state be protected and restored to original quality if polluted, including groundwater. This is firmly mandated in the Porter-Cologne Water Quality Control Act [California Water Code (Division 7)], in the State of California's "Antidegradation Policy" (State Water Resource Control Board Resolution No. 68-16) and "Sources of Drinking Water Policy" (State Water Resources Control Board Resolution No. 88-63), and in the State's Water Quality Basin Plans establishing the present and potential beneficial uses of waters of the state. Therefore, in addition to our primary concern for protecting drinking water sources, it is also the responsibility of this office to evaluate contaminated sites for the actual and/or potential threat to the groundwater resource in general. The basis for our request for further assessment work to delineate the soil contamination at this site is to gather the additional data this office needs to make an appropriate evaluation of your site and the threat to groundwater the soil contamination may pose, at the present time or in the future. The statement in the letter that there is no evidence of groundwater contamination may be premature at this time. The soil sample results from the drilling of monitoring well #1 indicated soil contamination from 36 feet below ground surface (BGS) to 77 feet BGS. In 1983 and 1986, years in which there was a noted increase in rainfall and recharge to groundwater, the depth to the groundwater was approximately 50 to 60 feet BGS. Given this data, it appears likely that the groundwater may have been impacted by hydrocarbons at some time in the past. A monitoring well located in the downgradient direction from the source of contamination is requested in order to verify the quality of the groundwater at the present time and also to provide a data point to verify the quality of groundwater in the future. The requirements for the assessment and cleanup of contamination resulting from leaking underground storage tanks apply to all contaminated underground tank sites, and are regulated under Title 23, California Code of Regulations, Chapter 16, Article 11. PHS/EHD cannot grant variances from these requirements. A Division of San Joaquin County Hcalth Care Services