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N l� r <br /> PUBLIChEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer .. P <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> C (OPY ELIZABETH THAYER <br /> CALIFORNIA REGIONAL WATER <br /> QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER RD STE A <br /> SACRAMENTO CA 95827-3098 AUG 29 199zi, <br /> RE: LINDEN UNIFIED SCHOOL DISTRICT BUS GARAGE SITE CODE: 1817 <br /> 18351 EAST MAIN STREET <br /> LINDEN CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has determined that all <br /> appropriate response and remedial actions have been completed, and that no further investigation, remedial <br /> action, or monitoring with regard to underground storage tanks is warranted at the site noted above at this time. <br /> A 10,000 gallon diesel tank at the site required repair after having failed precision testing. After the subsequent <br /> repair, the tank passed precision tests and no further problems were reported. In 1989, three angle soil borings <br /> were drilled and three soil samples were obtained from beneath the tank. The results of the soil sampling <br /> indicated that residual levels of contamination were present below the westem end of the tank. The soil sample <br /> results from the middle and eastern end of the tank did not show contamination. <br /> Based on this data, PHS/EHD assumed a very conservative area of possible impact and calculated an estimated <br /> residual volume of hydrocarbons remaining. Assuming an area of 64,000 cubic feet, a bulk density for silty clay <br /> soil of 120 pounds per cubic foot, and 0.009 parts per million average benzene concentration, the volume of <br /> benzene estimated to remain is 0.069 pounds. Assuming the same parameters but using an average toluene <br /> concentration of 0.021 parts per million, the volume of toluene estimated to remain is 0.161 pounds. Seasonal <br /> high groundwater is for this area is 105 feet below ground surface, approximately 75 feet below this area of <br /> residual contamination. The total cumulative hydrocarbons estimated in this area is 0.023 pounds or 0.038 <br /> gallons. <br /> Therefore, PHS/EHD has determined that no further action at this site will effectively protect groundwater, now <br /> and in the future. <br /> A Case Closure Summary and a site chronology are enclosed for your reference. Unless otherwise notified by <br /> you, after thirty business days PHS/Ei-iD will issue a formal closure letter to the responsible party. <br /> If you have any questions or wish to discuss this site in more detail, please contact Linda Turkatte, Senior RENS <br /> at (209) 468-3441. Thank you for your consideration in this matter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> 4 C <br /> Linda Turkatte, Senior REHS Die . Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> LT <br /> c: Linden Unified School District, Todd Swanson <br /> A t)i,i.ion of San Joaquin County Health Care Services <br />