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California Regional Water Quality Control Board <br /> 1 Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secreraryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http:/Iw .sweb.ca.gov/—mgcb5 (������II�D <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 IUrS❑ v <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> AUG 2 2 2002 <br /> 21 August 2002 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Lynn Forcum <br /> California Natural Products �O <br /> P.O. Box 1219 1 <br /> Lathrop, CA 95330 <br /> REQUEST FOR ADDENDUM TO GROUNDWATER MONITORING WORKPLAN, CALIFORNIA <br /> NATURAL PRODUCTS, LATHROP, SANJOAQUIN COUNTY <br /> I have reviewed the 6 June 2002 Additional Monitoring Well Installation Workplan, California Natural <br /> Products, prepared by Kleinfelder, Inc. The plan was prepared in response to Waste Discharge <br /> Requirements (WDRs) Provision 2.b that required preparation of a groundwater monitoring well <br /> workplan. After reviewing the workplan,I have the following comments: <br /> — As stated in Section 2.3 of the report, groundwater flow direction at the facility may be influenced by <br /> groundwater extraction, irrigation water deliveries, and wastewater application. Because of the <br /> importance of installing the new wells in areas that are upgradient of the land application areas, <br /> additional evaluation is warranted. I have attached recent data collected at the Sharpe Army Depot <br /> site for your consultant's use. Please submit groundwater elevation contour maps that better define <br /> the groundwater flow conditions at the site. A minimum of four quarters should be contoured to <br /> evaluate the groundwater flow direction. <br /> — Based on the new information transmitted in this correspondence, please reevaluate the well <br /> locations proposed on Plate 2 of the well installation workplan. <br /> — If conditions in the borehole allow, it is recommended that the sand pack be surged prior to installing <br /> the bentonite seal consistent with SJCEHD Well Standards Section 13.10.8. <br /> — The workplan states groundwater samples will be analyzed in accordance with the current <br /> Monitoring and Reporting Program requirements; collection of samples for trihalomethanes analysis <br /> is also required on an annual basis in the first quarter. <br /> — If a slip cap is used on the bottom of the well casing, it must be secured using stainless steel screws. <br /> By 21 September 2002,please submit an addendum to the workplan that addresses these comments and <br /> provides a schedule for well installation. <br /> California Environmental Protection Agency <br /> Co Recycled Paper <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 http://w .swrcb.ca.gov/mgcb5 <br />