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Ms Elizabeth Thayer <br /> February 22, 1993 <br /> Page 6 <br /> the smear zone) will be remediated concurrently using vapor extraction and sparging, <br /> which is anticipated to take 3 to 5 years <br /> 8 The receiving waters are Sugar Cut, winch flows into Old River, which is part of the San <br /> Joaquin Delta system This is a mayor waterway that has tidal influence and occasional <br /> flow reversal in the Tracy area. The California Aqueduct and Delta Mendota Canal are <br /> supplied by these waters. The water is used for irrigation and municipal water supply <br /> 9 Chlorinated volatile hydrocarbons and general mineral analyses have been completed at <br /> tins site Laboratory reports are summanzed in Tables 1 and 2, respectively Lead <br /> (graphite furnace AA or equivalent) and chlorinated pesticide (EPA Method 608 or 8080) <br /> analyses will be performed prior to startup of the system, and results will be reported to <br /> the RWQCB when obtained <br /> A Problem Assessment Report (PAR) was submitted to the RWQCB on <br /> September 28, 1987 Several other reports have been prepared by BCC and submitted to <br /> the RWQCB and San Joaquin County Environmental Health Department since 1987, <br /> documenting additional work performed at the site. These reports include the following: <br /> . Problem Assessment Report, September 28, 1987 <br /> Quarterly Reports, Quarterly since <br /> Site Investigation Report, July 25, 1989 <br /> Supplemental Site Investigation Report, March 5, 1991 <br /> Letter Report describing Installation of Off-Site Wells, December 20, 1991 <br /> These reports and the existing NPDES Permit Application/Report of Waste Discharge were <br /> all prepared under my guidance (California Registered Geologist #4301) If you require <br /> additional copies of any of these reports, please contact me at (916) 444-0123. It is my <br /> understanding that upon receipt and review of the information contained in this letter,you will <br /> process our NPDES permit application. <br /> Sincerely, <br /> BROWN AND CALDWELL CONSULTANTS <br /> jay Lucas <br /> Calnforrua Registered Geologist#4301 <br /> JL.SP lk <br /> Enclosure <br /> cc Chuck Carmel, ARCO Products Company <br /> A Harlin Knoll, San Joaquin County Environmental Health <br /> Brown and Caldwell <br /> Consultants XTR <br />