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� EALTH SERVICESPUBLIC M <br /> SAN JOAQUIN COUNTY �+ <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer1.. <br /> cryo <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> BRUCE MC CANDLESSO poy, <br /> RIPON FARM SERVICE 1994,PO BOX 806 <br /> RIPON CA 95366 <br /> RE: Ripon Farm Service Site Code: 1605 <br /> 22871 South Highway 99 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Preliminary Site Assessment Work Plan" dated April 1994 and prepared by Geological <br /> Audit Services. PHS/EHD has the following comments for your consideration. <br /> The work plan proposed to drill and sample four soil borings to investigate petroleum hydrocarbon <br /> contamination documented at the time of the underground storage tank (UST) removals, June 15, 1987. <br /> Two soil borings will be drilled in the area of former UST #1 and #2 and two in the area of former UST <br /> #3 and #4. Soil samples will be collected at five foot intervals to a total depth of 25 feet below grade. A <br /> minimum of two soil samples from each borings will be submitted for laboratory analysis. Since <br /> groundwater is expected to be encountered a groundwater sample will be collected for analysis from each <br /> soil boring. If field conditions warrant, one or more soil borings will be converted into monitoring wells. <br /> Grouting of the boreholes should be accomplished using a cement/bentonite slurry. <br /> Since soil contamination was evidenced at 21 feet below grade and groundwater in this area is at 25 feet <br /> below grade a groundwater investigation is warranted. PHS/EHD recommends three monitoring wells be <br /> installed at this time. <br /> Please submit a drilling permit application and $89. for the soil investigation. Field work may commence <br /> upon issuance of a drilling permit. Please provide PHS/EHD 48 hours notice prior to commencing field <br /> work so that the sampling and grouting can be witnessed. <br /> If you have any questions, 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/22871HWY <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Bob Marty, Geological Audit <br /> A Dk ision of San,Joaquin County Health Care Services <br />