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r • PETE WILSON, Governor <br /> STATE OF CALIFORNIA - Environmental Protection Agency <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION � AL HEA1.Th p <br /> 3443 Routier Road, Suite ASE �t <br /> - ��' � '•� <br /> � �..F.DICE <br /> Sacramento, CA 95827-3098 <br /> PHONE: (916) 255-3000 94 FEB —2 PM I; 07 <br /> FAX: (916) 255-3015 <br /> 31 January 1994 <br /> Mr. Nick Nickerson <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 450 <br /> San Ramon, CA 94583 <br /> REQUEST FOR FURTHER INVESTIGATION: PUREGRO/BREA AG, STOCKTON <br /> Thank you for submitting the third quarter groundwater monitoring report for the former <br /> PureGroBrea Ag site in Stockton. A review of the three quarters of data shows that <br /> although the 1,2-dichloropropane concentrations have declined in the three downgradient <br /> wells, the levels are still much higher than that which this agency can allow in the <br /> groundwater. In addition, nitrate concentrations are elevated in at least one monitoring well. <br /> While we realize that there is still one more quarter of monitoring to be conducted (in <br /> February), we wish to begin preparation for the next phase of investigation. As we see it, <br /> this would be to define the extent of the 1,2-D and nitrate plumes. <br /> Please submit a workplan, prepared by a Registered Engineer, containing a proposal for <br /> plume definition. The workplan should also contain a proposal for continued monitoring of <br /> the existing wells, and a timeline for all tasks. The workplan should be submitted no later <br /> than 30 March. <br /> If you wish to schedule a meeting, or have any questions, I can be reached at <br /> (916) 255-3104. <br /> WENDY WYELS <br /> Ag Regulatory Unit <br /> cc: Mr. Michael Infurna, San Joaquin County Environmental Health, Stockton <br />