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Mr.-David a. Rosso <br /> California State University Stanislaus <br /> 1252 N. Stanislaus Street, Stockton <br /> Page 2 oft <br /> The shallow wells locations are appropriate, although the-total depths on these <br /> wells should not penetrate the upper clayey unit that bottoms at 52 to 55 feet <br /> bsg, as this may permit vertical communication between the first water zone and, <br /> the mixed silt-silty sand and 'stiff fine-grained' interval`between 52/55 and 65/68. <br /> feet bsg. Based on the findings from the proposed work, the interval of mixed soil <br /> types between 55 and 118 feet..bsg may merit future additional characterization.. <br /> The analytical regimen proposed for groundwater` and soil samples collected <br /> during the investigation is appropriate and approved. Collection of the biological <br /> natural attenuation indicator data as proposed is also approved. The bench-scale <br /> test and any other analyses proposed to evaluate injection of oxygenating . <br /> substances must receive prior approval from Mr. James Barton of the Central j <br /> Valley Regional Water. Quality Control Board (CVRWQCB) before <br /> implementation. <br /> EHD desires to assist you in this matter as much as possible. Questions or I <br /> comments may be directed to Nuel Henderson by mail (address on letter head), <br /> by e-mail at nhenderson@sjcehd.com, or by telephone at (209) 468-3436. <br /> Donna Heran, REHS, Director - <br /> Environmental Health Division <br /> Nuel C. Henderson, Jr., PG <br /> Unit IV - Site Mitigation <br /> I <br /> i' <br /> cc: James L.L. Barton — CVRW•QCB <br /> Donald F. Kresse — Condor <br /> i <br />