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"Harlin Knoll [EH]" To cAnne_Wanken@urscorp comms <br /> f <HKnollgslcehd corner cc <br /> 02/13/2004 11 52 AM Subject RE ARCO Station No 02093 <br /> With the graphs and declining contaminant trends, we can ask the CVRWQCB for <br /> site closure consideration <br /> Hk <br /> -----Original Message----- <br /> From Anne_Wanken@URSCorp com (mailto Anne Wanken@URSCorp com] <br /> Sent Friday, February 13, 2004 9 01 AM <br /> To Harlin Knoll [EH] <br /> Cc vernon_elarth@urscorp com <br /> Subject ARCO Station No 02093 <br /> Harlan, <br /> Thank you for getting back to me about ARCO Station No 02093 This is one <br /> of the ARCO sites that URS has identified as a potential closure site for <br /> 2004 During our telephone conversation today, you informed me that you <br /> and Jim Barton (RWQCB-CVR) would like to see graphs of each well that has <br /> historically been impacted with petroleum contamination The graphs should <br /> graph the following information over time <br /> - concentrations of benzene, MtBE, and 1, 2-DCA (if present) using a <br /> logarithmic scale <br /> - groundwater elevation <br /> . It is my understanding that the trends shown on these graphs should be <br /> evaluated and discussed in a letter and presented to you and Jim for your <br /> consideration If the trends are favorable and show that the <br /> concentrations have been significantly remediated and/or attenuated, we <br /> will proceed with a closure request report <br /> Please let me know if I have understood your request Thank you again for <br /> your time and consideration of this site for closure <br /> Anne M Wanken <br /> Senior Compliance Specialist <br /> URS Corporation <br /> 2870 Gateway Oaks Drive, Suite 300 <br /> Sacramento, California 95833 <br /> (916) 619-2346 - direct phone <br /> (916) 679-2900 - fax <br /> • <br />