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PUBLIC HEALTH <br /> SEMCES Pqu;N <br /> SAN JOAQUIN COUNTY <br /> r.- <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 P <br /> qLf O.R'A <br /> 209/468-3420 � <br /> FID)yBRUCE MCCANDLESS <br /> RIPON FARM SERVICE <br /> PO BOX 806 _ <br /> RIPON CA 95366 <br /> Re: Ripon Farm Service Site Code: 1605 <br /> 22871 South Highway 99 <br /> Ripon CA 95366 <br /> San Joaquin County Public Health, Environmental Health Division (PHS/EHD) has completed review of the <br /> "Quarterly Report" dated March 17, 1995 and the "Interim Work Plan" dated February 13, 1995, both <br /> prepared by Geological Audit Services. PHS/EHD has the following comments for your consideration. <br /> The quarterly report included the results of the February 24, 1995 sampling event which continued to evidence <br /> petroleum hydrocarbon contamination in all three existing monitoring wells, MW1 - MW3. The gradient <br /> direction was calculated and it was determined that it shifted from northwesterly to southwesterly. <br /> The interim work plan proposed the drilling of four soil borings, two of which would be completed into <br /> monitoring wells. The borings and monitoring wells should provide information to further determine the <br /> extent of soil and groundwater contamination associated with the former underground storage tanks. Please <br /> be informed that additional monitoring wells, to the South of MW1 and to the north of MW2 and MW3 may <br /> be necessary, in order to determine the full extent of groundwater contamination. <br /> Please note that the permit issued to Mitchell Drilling expires on April 27, 1995 and should you wish to <br /> perform field work after the expiration date or to change the drilling contractor, a permit application and $89 <br /> fee should be submitted. <br /> Please contact me at (209) 468-0337 if you have further questions or wish to schedule a site inspection. <br /> Donna Heran, REHS Director <br /> Environmental Health Division <br /> v <br /> Mary Meays, Senior REHSt DianeeKinson, RE S <br /> Site Mitigation Unit Supervisor <br /> MM12287HIIA <br /> cc: Elizabeth Thayer, CVRWQCB, 3443 Routier Road Suite A, Sacramento CA 95827 <br /> cc: John Trump, 2280 Union Street, San Francisco CA 94123 <br /> cc: Bob Marty, 1803 March Lane Suite A, Stockton CA 95207 <br /> A Division of San Joaquin County health Care Services <br />