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CALIFORNIA REGIO&WATER QUALITY CONTROL BOARD 4 Cal/EPA <br /> CENTRAL VALLEY REGION <br /> $ 3443 Routier Road,Suite A I <br /> Sacramento,CA 95827-3098 r <br /> 97 <br /> Phone(916)255-3000 r <br /> FAX(916)255-3015 10l 36 Pete Wilson,Governor <br /> 15 December 1997 <br /> Mr. Nick Nickerson <br /> Unocal Asset Management Group <br /> 2121 N. California, Suite 250 <br /> Walnut Creek, CA 94596 <br /> REQUEST FOR WORKPLAN, FORMER PUREGROIBREA,STOCKTON,SAN JOA QUIN <br /> COUNTY <br /> I am in receipt of the 14 November 1997 Third Quarter 1997 Quarterly Monitoring Report and the <br /> 14 November 1997 Report of Results-Investigation of Agricultural Chemicals in Soil for the former <br /> PureGroBrea Ag facility on North Broadway Avenue in Stockton. The quarterly monitoring report <br /> confirms that the farthest downgradient well, MW-9, contains the chemical 1,2-dichloropropane. <br /> Therefore, the extent of the 1,2-dichloropropane plume has not yet been delineated. By 15 January <br /> 1998, please submit a workplan for installation of an additional monitoring well downgradient of MW-9. <br /> The soil investigation report contains the results of eight deep soil borings collected on the southern half <br /> of the property. Slightly elevated levels of nitrate and total Kjeldahl nitrogen were found around the <br /> former tank farm, while much higher concentrations were detected next to the washrack. The analytical <br /> results show that use of this washrack has allowd, and is continuing to allow,releases of fertilizer <br /> rinsewater to the soil. In addition,the washrack is not constructed or operated in such a way that it is in <br /> compliance with the fertilizer waiver policy. Therefore,by 15 February 1998 please submit a workplan <br /> to upgrade the washrack to meet the conditions of the waiver policy (copy enclosed). This workplan is <br /> to be prepared and implemented in coordination with the current users of the washrack, Agrium Inc. <br /> If yo <br /> u have any questions, I can be reached at(916) 255-3078. <br /> - �WYELS <br /> Site Cleanup Unit <br /> Enclosure <br /> cc: Mr. Mike Infuma, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Eric Chase, Sierra Pacific Groundwater Consultants, El Dorado Hills <br /> Ms.Nancy Bishop, Western Farm Service, Lafayette <br /> Mr. Jan Wagoner,Unocal, West Sacramento <br /> Recycled Paper Our mission is to preserve and enhance the quality of California's water resources,and <br /> ensure their proper allocation and efficient use for the benefit ofpresent and future generations. <br />