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RUG 30 '94 02t10PM CHPRLES R WHITWOR P.Sit <br /> rT ''f�l.(�T�U - <br /> PETE WILSON, Governor <br /> STATE OF CALIFORNIA•Environmental Protection AOency u <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD �/} <br /> CENTRAL VALLEY REGION loon/ <br /> 3643 Routier Road,Suite A (J e n dp <br /> Sacramento. CA 95827.3098 <br /> PHONE: (916)255-3000 I✓"" �f R/,G"�''A'�'i_(' . <br /> FAX:(916)2563015 <br /> Ms. Catherine Whitworth, trustee �C�r . ..aVT 26 August 1994 <br /> Cal Farm Supply <br /> P.O. 13oz 280 <br /> Davis, CA 95617 _ <br /> REQUEST FOR INVESTIGATION: CAI, FARM SUPPLY, STOCKTON <br /> For over a year, the Regional Water Quality Control Board has been involved in an investigation <br /> into the extent and source of nitrogen pollution at the former PM Ag Products feed facility on W. <br /> Washington Street in Stockton. Recent groundwater monitoring at this facility shows high levels of - <br /> nitrate in the upgradient well. The former Cal Farm Supply property is upgradient of the PM Ag <br /> -Products site. <br /> Our files show that a series of site assessments have been completed at Cal Farm Supply, and that <br /> elevated nitrate levels were found in one monitoring well in 1989. Although soils containing <br /> organochlorine pesticides were removed from the sites, the groundwater has not tested for <br /> pesticides. In addition, petroleum hydrocarbons remain in the groundwater from a leaking <br /> underground tank. <br /> We understand that you have recently requested a closure certification from the Board and San - <br /> Joaquin County Public Health Service, and that the County is requiring additional monitoring of the <br /> wells for petroleum products. This letter is to formally request (a) that groundwater from the five <br /> monitoring wells be sampled one time and analyzed for organochlorines, organophosphates, <br /> carbamates, triazines, and chlorinated herbicides; and that (b) you conduct a further assessment to <br /> determine whether Cal Farm Supply is the source of the elevated nitrate levels found in PM Ag <br /> Product's upgradient well. Tltis further assessment shall be coordinated with site assessment <br /> -activities a PM Ag Products. - <br /> By 15 October 1994, please submit a workplan to accomplish the above two objectives. The <br /> workplan shall include a scope of wutk avid a proposed time schedule for each phase of work. All <br /> field work, data interpretation, and report writing shall he conducted under the supervision of a <br /> registered engineer or geologist. <br /> If you have any questions. or wish to set up a meeting to discuss this matter, you may contact me at <br /> (916) 255-3104. <br /> 4tt� <br /> WENDY WYEIS <br /> Ag Regulatory Unit <br /> cc: Ms. Diane Hinson, San Joaquin County Public Health Service, Stockton <br /> Mr. Nick Nickerson, Unocal, San Ramon <br /> -Mr. Charles Hall, Napa - <br />