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California RMional Water Quality Antrol Board Central Valley Region Robert Schneider,Chair Winston H.Hickox Gray Davis Secretaryfor Sacramento Main Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/—mgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Phone(916)255-3000•FAX(916)255-3015 - 29 May 2001 Mr. Lynn Forcum California Natural Products P.O. Box 1219 Lathrop, CA 95330 CONDITIONAL APPROVAL OF GROUNDWATER MONITORING WORKPLAN, CALIFORNIA NATURAL PRODUCTS, LATHROP, SANJOAQUIN COUNTY I have reviewed the 8 May 2001 Groundwater Monitoring Workplan, California Natural Products, prepared by Kleinfelder. The plan was prepared in response to a 13 March 2001 request from the Regional Board for a groundwater monitoring workplan. After reviewing the workplan, I have the following comments: — Because the report does not discuss groundwater sampling procedures, the workplan should reference the 13 April 2001 Sampling and Analysis Plan and the 2 May 2001 Addendum No. 1 prepared by Kleinfelder. — Please resubmit Figure 2 with the building features shown. Features that should be shown include buildings, roadways, application areas, existing well locations, and proposed well locations. — Based on a presumed west-northwest groundwater flow direction, the well locations in the proposed land application area might be improved. Please approximately locate the property lines and reevaluate the western most well location. Additionally, considering the presumed groundwater flow direction,please reevaluate the northern most well location and resubmit Figure 1. — The use of neat cement with up to five percent bentonite by weight is acceptable as an annular seal. The wellheads shall be set in concrete in accordance with Section 13.14.4 of the San Joaquin County Environmental Health Department's (SJCEHD's)Well Standards. — If conditions in the borehole allow, it is recommended that the sand pack be surged prior to installing the bentonite seal consistent with SJCEHD Well Standards Section 13.10.8. — If a slip cap is used on the bottom of the well casing, it must be secured using stainless steel screws. By 13 June 2001,please submit an addendum to the workplan which addresses these comments and provides a schedule for well installation. The 13 March 2001 Regional Board Order for Technical Reports requires the submittal of the Groundwater Well Installation Report by 30 July 2001. California Environmental Protection Agency Ca Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/mgcb5