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1 <br /> Department of Toxic Substances Control <br /> Edwin F. Lowry, Director <br /> 8800 Cal Center Drive <br /> Winston H. Hickox Sacramento, California 95826-3200 �����VEC) Gray Davis <br /> Agency Secretary U li Governor <br /> California Environmental <br /> Protection Agency JAN 2 1 2003 <br /> January 16, 2003 <br /> ENPEMITHEALTH <br /> /SERVICES <br /> Mr. Marshall Cloud <br /> Remedial Project Manager <br /> Defense Distribution Depot—Tracy Site <br /> P.O. Box 960001 <br /> Stockton, California 95296-0320 <br /> COMMENTS ON FULL-SCALE OVERLAND FLOW REPORT DATED DECEMBER 6, <br /> 2002 FOR DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN, TRACY SITE, TRACY, <br /> CALIFORNIA <br /> Dear Mr. Cloud: <br /> The Department of Toxic Substances Control (DTSC) received the above-mentioned <br /> document on December 9, 2002. The Full-Scale Overland Flow Report's objective was <br /> to evaluate the feasibility of disposing of water using the overland flow and evaluate the <br /> use of treated groundwater for pre-irrigation purposes. DTSC has the following <br /> comments: <br /> General Comments: <br /> 1. The analytical data suggests that constituents in the soil, specifically chloride, boron <br /> and soil salinity are outside of the Fruit Growers Laboratory (FGL) optimum range for <br /> plant growth. These constituents appear to be increasing in concentration in the soil <br /> samples taken since the initial discharge to the pilot study plot. In addition, the FGL <br /> rates the effluent as "poor" in terms of crop suitability and a "severe problem" for <br /> irrigation use. Please discuss the impact this will have on any future agricultural <br /> development of the annex area and provide conclusions/recommendations on using <br /> treated groundwater for pre-irrigation purposes. <br /> 2. Please discuss in the conclusions/recommendations section how long it would take <br /> for the natural breakdown of boron, chloride and salts in the soil to levels considered <br /> "optimum" for plant growth assuming the continuous discharge to the overland flow <br /> plots under for another three to five years with all other parameters remaining the <br /> same. This information would help to determine how practical it would be in the <br /> future to use this land to produce a consumable product or whether there is a need <br /> to designate the land as a non-farming area used solely for overland flow. <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at www.dtsc.ca.gov. <br /> 0 Printed on Recycled Paper <br />