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PUBLIC HEALTH SERVICES ,o <br /> • a t <br /> JOGI KHr1ti\r1 M U if P N <br /> Health Othcrr ' <br /> PO Box 2009 • (160t East Hazelton Avenue) • Stockton, California 9520I C, I1p po�P <br /> (209) 468-3400 <br /> MICHAEL SEIXAS <br /> RIVERSIDE CEMENT CO <br /> P0BOX 1587 <br /> ORO GRANDE CA 92368 AUG 3 0 1993 <br /> RE Riverside Cement Co SITE CODE. 2588 <br /> 2825 W Washington <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the "Problem Assessment Report and Final Report of Soil Investigation" dated July <br /> 1993 prepared by Wm J. Hunter and Associates for the above referenced site <br /> On April 6, 1993 approximately 120 cubic yards of contaminated soil were excavated from <br /> areas surrounding the former underground storage tank location This soil was stockpiled <br /> on site Sidewall soil sample results indicate that soil contamination has been removed <br /> laterally above groundwater. The excavation was filled with clean material in May 1993 <br /> Previously PHS/EHD staff was informed that the stockpiled soil would be disposed of at a <br /> landfill Therefore, PHS/EHD staff did not witness sampling of the stockpile Field <br /> compositing of the soil was performed prior to laboratory analysis. This method of sampling <br /> allows volatilization so sample results do not reflect actual conditions <br /> In order to dispose of the contaminated soil on-site, further sampling will be required Since <br /> ground water can rise to five feet below ground surface at this site, discrete sampling and <br /> analysis should be performed. A couple of alternatives should be considered. A permit or <br /> exemption can be obtained from the San Joaquin Valley Unified Air Pollution Control <br /> District and sampling can occur after the soil has aerated for a period of time or the <br /> stockpile can be resampled in its current state with PHS/EHD staff present <br /> In addition, since contaminated soil was removed from depths at which groundwater <br /> sometimes rises to, a groundwater investigation will be required PIease submit a workplan <br /> for this phase of the investigation by October 15, 1993 <br />• <br /> 1 Division of pan Joaywn(ounry Heaith t are semr,,,5 r <br /> �IRECEIVED ; ,J ���3 <br />