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Mr.-David a. Rosso <br /> California State University Stanislaus <br /> 1252 N. Stanislaus Street,_Stockton <br /> Page 2 of 2 E <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 <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 <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 /> / r <br /> Nuel C. Henderson, Jr., PQ <br /> Unit IV - Site Mitigation <br /> r <br /> cc: James L.L. Barton — CVRWQCB ! <br /> Donald F. Kresse —,Condor i <br /> i <br /> i <br /> 4 <br /> 4 <br />