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PUBLICtEALTH SEM/ICES <br />SAN JOAQUIN COUNTY <br />ENVIRONMENTAL HEALTH DIVISION <br />Ernest M. Fujimoto, M.D., M.P.H., Acting Healt <br />445 N. San Joaquin Street • P.O. Box 388 • Stockton, C <br />(209) 468-3420 <br />DONNA SANTINI GARDNER <br />1206 STRUCK <br />ORANGE CA 92667 <br />RE: Donna Gardner Property <br />26056 Thornton Road <br />Thornton CA 95686 <br />JUL 0 7 1994 <br />Site Code: 1864 <br />San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has recently <br />reviewed site conditions and historical data pertaining to the above mentioned property. PHS/EHD has <br />prepared the following comments for your consideration. <br />Significant soil contamination was detected at the time of the September 6, 1989 tank removal of up to <br />830 ppm TPH-gas. The former underground storage tanks were located adjacent to the station building. <br />Subsequently, monitoring wells were installed to investigate the groundwater quality beneath the site. Soil <br />samples collected during 1990 and 1991 installations of wells located within 60 feet of the station building <br />and former tank area and within 25 feet of the Thornton Water Well #2 evidenced soil contamination of <br />up to 570 ppm TPH-gas and 320 ppb benzene. Since 1990, significant groundwater contamination <br />exceeding the State of California drinking water standards has been documented and although the <br />Thornton Water Well #2 has not yet been impacted, it is threatened by contamination evidenced at the <br />site. <br />Based on historic soil and groundwater data, the former location of the underground storage tanks, and <br />the nearby community well, PHS/EHD requests that at least the station building not currently in use, <br />undergo demolition to facilitate the removal of contaminated soil which is suspected beneath the building <br />and which continues to provide a source of contamination to groundwater. This excavation should be <br />scheduled to occur prior to July 22, 1994 as directed in PHS/EHD correspondence dated December 27, <br />1993. <br />If you have any questions or comments, please contact Mary Meays at (209) 468-0337. <br />Donna Heran, REHS, Director <br />Environmental Health Division <br />Mary Meays, Senior REHS Diane M. Hinson, REHS <br />Site Mitigation Unit Supervisor <br />MM\26056'TH0R <br />c: Elizabeth Thayer, Central Valley RWQCB <br />c: John Lane, RESNA <br />c: Al Hoslett, Wilson, Hoslett and Whitridge <br />c: Ron Rall, San Joaquin County Utilities Maintenance Districts <br />A Dkision of San Joaquin County Health Care Services