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California f1pional Water Quality Cora 4. Board �f <br /> Central Valley Region <br /> ion <br /> Katherine Hart, Chair <br /> 11020 Sun Center Drive,#200, Rancho Cordova,California 95670-6114 <br /> Linda S.Adams (916)464-3291 • FAX(916)464-4645 Edmund G.Brown Jr. <br /> Acting Secretary for http://www.waterboards.ca.gov/centralvalley Governor <br /> ivironmental Protection <br /> 13 April 2011 <br /> (1 APR 1 5' 2011 <br /> Jesse Solorio, P.E. L__ <br /> Senior Engineer <br /> Lawrence and Associates <br /> 3590 Iron Court <br /> Shasta Lake, CA 96019 <br /> REVIEW OF WORK PLAN FOR SLUDGE IMPOUNDMENT CLOSURE, DIAMOND PET <br /> FOOD PLANT, RIPON, SAN JOAQUIN COUNTY <br /> The Central Valley Water Board staff has reviewed the Work Plan for Sludge Impoundment <br /> Closure at the Diamond Pet Food Plant. The sludge impoundment is one of two <br /> impoundments utilized by the former paper mill owner, Neenah Paper, to dispose of inert <br /> sludge generated from the paper making process. Previously, the former owners closed the <br /> first of two sludge ponds by leaving in place the inert sludge and covering with a minimum of <br /> one foot thick vegetative soil cover graded to drain. This method of closure is described in <br /> Waste Discharge Requirement (WDRs) Order 5-01-148. <br /> The Discharger proposes to close the second sludge pond in a similar fashion utilizing soil <br /> from the western berm as final cover, graded to drain toward the west allowing storm water to <br /> runoff into the West Percolation Field. Post closure maintenance will include frequent <br /> inspections of the closed pond. The work plan proposes to conduct inspections of the final <br /> cover following each significant storm event during the first two winters. Repairs will be <br /> performed either during the wet season or prior to 15 October each year, depending on the <br /> severity of the erosion to the final cover. <br /> During closure construction of the sludge pond, the Discharger proposes to destroy well OB-9 <br /> due to its proximity to the western berm. Monitoring wells OB-12 and OB-18 provide detection <br /> monitoring of groundwater quality in the vicinity of well OB-9 and staff concurs with the <br /> destruction of this well prior to construction of the final cover. The Discharger must permit and <br /> destroy the well per the San Joaquin County Environmental Health Department guidelines and <br /> the Department of Water Resources Well Standards. <br /> Due to the nature of the material discharged to the pond, it is not subject to regulations in <br /> California Code of Regulations (CCR) Title 27 as discussed in Finding No. 24 of WDRs Order <br /> 5-01-148. Staff concurs with the closure plan as described in the 28 December 2010 work <br /> plan. <br /> The Final Construction As-built Report shall be submitted by 30 September 2011. This report <br /> must incorporate all construction quality assurance (CQA) inspections and monitoring well <br /> California Environmental Protection Agency <br /> p4aRecycled Paper <br />