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California Regional Water Quality Control Board o <br /> Central Valley Region <br /> Steven T.Butler,Chair ray Davis <br /> Winston H.Hickox <br /> Secretaryfor Sacramento Main Office c:,: Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Rouder Road,Suite A,Sacramento,California 95827-3003 G) <br /> Phone(916)255-3000•FAX(916)255-3015 - N <br /> 24 August 2000 <br /> Certified Mail <br /> Certified Mail — <br /> 7000 1670 0000 6997 4754 7000 1670 0000 6997 473010 <br /> Mr. Bob Boust Mr. Ed Koberstein <br /> Unocal DBG/AMG Montgomery Ward <br /> 8788 Elk Grove 1331 South Harbor <br /> Building 3, Suite 15 Fullerton, CA 92632 <br /> Elk Grove, CA 95624 <br /> ROBINHOOD IRRIGATION WELL,SAN JOAQUIN DELTA COLLEGE, 5151 PACIFIC <br /> AVENUE,STOCKTON <br /> On Monday, 21 August 2000, the Robinhood Irrigation Well (RIW) was taken out of service as the <br /> result of an identified impact by petroleum hydrocarbon contamination. The RIW was the sole source <br /> for irrigation of the San Joaquin Delta College (Delta)campus, and was utilized for about 13 hours out <br /> of every 24-hour period at an average pump rate of 550 gallons per minute. <br /> Based on review of our files for your respective unauthorized releases located at 5606 Pacific Avenue <br /> (Unocal) and 5400 Pacific Avenue (Montgomery Ward), your sites clearly appear to be, either <br /> individually or as a commingled plume, the source of the petroleum contamination found in the RIW. <br /> Additional investigative data will be required to demonstrate that either of the two sites is solely <br /> responsible. At this time, you are both considered jointly responsible for all activities necessary to <br /> investigate and analyze the effects of the contamination identified in the RIW, and all other actions as <br /> necessary to abate the effects of the contamination, which includes the replacement of an equivalent <br /> alternative water source. <br /> Regional Board staff has met with the appropriate Delta Staff(environmental, administrative and <br /> facilities), and San Joaquin County Environmental Health Division staff to discuss alternatives to this <br /> problem. The result is both a short term alternative and a more permanent long term solution. .On the <br /> short term, connection to city supplied water is the quickest, cost-effective approach that appears <br /> feasible. However, for the long term, a new well has been discussed as the most feasibly cost–effective <br /> approach. As you are aware, a meeting has been planned for Tuesday, 29 August 2000, to be held at the <br /> Delta administrative office at 9:00 AM for further discussion and action. Delta staff has already <br /> implemented partial city water connection, at their expense, and are determining the necessary additional <br /> equipment, supplies and costs associated with attempting to obtain sufficient volume to replace the <br /> off-line RIW. <br /> Environmental Protection Agency <br /> California E S Y <br /> 0 Recycled Paper <br />