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California keflonal Water Quality (untrol Board =. <br /> Central Valley Region <br /> Robert Schneider,Chair Gray Davis <br /> Governor <br /> Winston H. Hickox Sacramento Main Office <br /> Secretaryfor Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Environmental <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 26 February 2001 <br /> Phil Delk Jay Allen <br /> Nick Nickerson Stone Brothers <br /> Unocal DBG/AMG Deputy General Council Management Company <br /> 8788 Elk Grove Blvd. Montgomery Wards <br /> 535 West Chicago Avenue 1024 W.Robinhood Drive <br /> Building 3, Suite 15 Chicago, IL 60671 Stockton, CA 95207 <br /> Elk Grove, CA 95624 <br /> REVIEW TEST BORING RESULTS ROBTNHOOD IRRIGATION WELL REPLACEMENT <br /> FORMER UNOCAL STATION#5098 AT 5606 PACIFIC AVENUE,AND MONTGOMERY WARDS <br /> PACIFIC <br /> CLEANUP AND ABATEMENT GRDER (C&A)NO. 5-00-707O �AN JOAQUIN COUNTY <br /> C&A No. 5-00-707 requires former Unocal Station#5098 (Unocal)and former Montgomery Wards Auto <br /> Service (Wards)to provide an alternate irrigation water supply to San Joaquin Delta College (Delta College) <br /> due to impacting Delta College's Robinhood Irrigation Well (RIW) with petroleum hydrocarbons and <br /> benzene. The RIW was removed from service in August 2000, and the Delta College now relies on treated <br /> water supplied from the City of Stockton for their irrigation needs. <br /> Environmental Audit,Incorporated(EAI),the consultant for Unocal and Wards, submitted a plan of work in <br /> October 2000 to construct a test boring on the Delta College campus in order to properly locate and design a <br /> replacement irrigation well, and to collect water samples for analysis. In our 20 October 2000 letter,we <br /> approved EAI's plan of work, and required that they submit a report of findings following the test boring <br /> investigation. This required report was to include an updated list of all open and closed underground <br /> storage tank sites and existing water supply wells within 2,500 feet of the proposed replacement irrigation <br /> well. <br /> Board staff reviewed the 16 January 2001 Test Boring Results Robinhood Irrigation Well Replacement <br /> submitted by EAI, on behalf of Unocal and Wards. EAI completed the test boring to 415 feet below ground <br /> surface (bgs)at a site approximately 2,000 feet southwest of the RIW. Site work included drilling, <br /> geophysical logging, and collecting water samples for analysis. Results of drilling activities identified two <br /> water bearing zones below 300 feet,which were sampled and analyzed for general minerals, petroleum <br /> hydrocarbons, and volatile organic compounds including fuel oxygenates. No contamination was identified. <br /> General mineral parameters were compared to samples collected from the RIW in 1991, and found to be <br /> similar. <br /> EAI identified fourteen UST sites within 2,500 feet of the proposed replacement irrigation well(proposed <br /> well) location. Eleven former USTs were identified on the Delta College campus,which were used for <br /> waste oil, petroleum, or photochemical storage. Contamination was not identified at these former USTs <br /> sites, and all eleven of the USTs have been removed and the sites have been closed. Three additional USTs <br /> California Environmental Protection Agency <br /> oa Recycled Paper <br /> The ways nergcachallenge <br /> alle ge demand and cut your energy Every calif our needs <br /> take immediate <br /> //wwwswrcti ca gor duce energy consumption. For a list of simple <br />