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STATE OF CALIFORNIA—HEALTH AND WELFARE 0NCY • GEORGE DEUKMEJIAN, Govemor <br /> DEPARTMENT OF HEALTH SERVICES <br /> TOXIC SUBSTANCES CONTROL DIVISION <br /> REGION I <br /> 4250 POWER INN ROAD March 2, 1989 <br /> SACRAMENTO,CA 95826 <br /> (916)739-3145 ^\ <br /> Mr. Mark S. Dockum <br /> Geologist MAR 6 1989 <br /> Kennedy/Jenks/Chilton <br /> 3336 Bradshaw Road ENVIRONMENTAL HEALTH <br /> Suite 320 <br /> PERMIT/SERVICES <br /> Sacramento, CA 95827 <br /> Dear Mr. Dockum: <br /> CAL-FARM SUPPLY, STOCKTON, SAN JOAQUIN COUNTY <br /> On December 8, 1988 the Department of Health Services (DHS) <br /> received a document titled "Work Plan for Preliminary Site <br /> Assessment, CAL-FARM Supply, Stockton Facility" (Workplan) . The <br /> submittal sets forth plans for investigation activities that will <br /> be conducted at the site. Although it has not been stated in the <br /> Workplan, DHS assumes that the investigation is intended to <br /> locate and confirm possible contamination of soil and ground <br /> water. <br /> DHS has reviewed the Workplan and our comments follow: <br /> 1) If DHS will be asked to make a determination as to whether <br /> the site poses any risks to human health and the environment <br /> due to pesticides that may be present at the site, then <br /> complete documentation of pesticides handled at the facility <br /> along with statistically based sampling of those areas where <br /> the pesticides were stored or otherwise handled is required. <br /> If documentation of the types of pesticides handled are not <br /> available then sampling and analyses for all pesticides of <br /> concern must be completed. <br /> 2) The compositing of soil samples can reduce the cost of <br /> sample analyses, but the compositing process increases the <br /> effective detection limits and there is a loss of the <br /> ability to correlate a specific sample point with <br /> contamination detected in the analyses. We, therefore, <br /> suggest that the number of samples composited be kept to a <br /> minimum. <br /> 3) We suggest continuous coring of the borings for monitoring <br /> wells. Those cores not to be saved for analyses should be <br /> logged by a registered geologist. We also suggest that both <br />