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AMERICAN - GE54xIESERVICES , INC . <br /> Environmental, Geologicl, aNe ; rmlpesource Consultants <br /> January 3, 1996 _ <br /> Ms.Margaret Lagorio, Lead Senior REHS <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> Environmental Health Division -- <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> RE: Review of potential remediation alternatives , Tracy Cold Storage, Tracy, California. <br /> Site Code 505329 -- <br /> Dear Ms. Lagorio; - <br /> American Geological Services, Inc. has reviewed the currently available-site data in order <br /> to evaluate possible: remediation alternatives--for -the- above- referenced site. This <br /> preliminary„review was:conducted in response to your letter dated November 8, 1995. <br /> Numerous remediation alternatives*were reviewed; mcludmg soil yap and. <br /> -. _.. <br /> soil excavation with subsequent ground water treatment <br /> Soil descriptions cbntained on boring logs prepared by Remcor during soil boring and <br /> monitoring well installations indicate firm clay-soil across the site to a maximum--drilled <br /> depth of 18 feet below grade.- The'static ground water level is approximately 12feet <br /> below grade and the screened interval_of each monitoring well extends from 8 feet to 18 <br /> feet below grade. <br /> Because of the. firm clay character of'the site soils, it is believed that high vacuum <br /> =_pressures would be required to produce an-effective radius of-influence around extraction <br /> wells in a vapor extraction system. The :.need for high vacuum pressure would <br /> significantly.increase th_ e cost of the vapor extraction system installation, operation, and, <br /> perhaps, maintenance. Furthermore,•because of the shallow ground water depth and the <br /> fact that there is no-cap of asphalt or other- impermeable-material over the contaminated <br /> soils,there is a high potential for short circuiting of the vapor stream. <br /> p' : he installation of vapor extraction test wells on'�th s site <br /> It is the opinion of AGS that t <br /> would not be prudent as this technology is likely to be inefficient in removing target , <br /> constituents,. from.the soils present... Given the present state of-knowledge of the site a <br /> remediation system that incorporates soil excavation followed by a ground°water pump <br /> - and treat system would be the most cost-effective alternative. i <br /> Telephone (209)532-8021 P.O. Box 3446, Sonora, CA 95370 FAX,(209)532-3809 <br />