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Californi� egonal Water Quality Co 0 I Boas <br /> Central Valley Region <br /> Karl E.Longley,ScD,P.E.,Chair ev <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 956746114 Arnold <br /> Secretaryfor Phone(916)464-3291 •FAX(916)4644645 1 Schwarzenegger <br /> Environmental Governor <br /> http://www.waterboazds.ca.gov./centralval e <br /> Protection <br /> v <br /> 14 January 2008 <br /> 1 29 <br /> W. Michael Carroll <br /> San Joaquin County Dept. of Public Works <br /> Solid Waste Division <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF ADDENDUM TO THE CLOSURE AND POSTCLOSURE MAINTENANCE PLAN <br /> AND CONSTRUCTION QUALITY CONTROL PLAN FOR THE EXTENSION OF CLOSURE <br /> CAP AT THE CORRAL HOLLOW SANITARY LANDFILL, SAN JOAQUIN COUNTY <br /> The Central Valley RegianaI Water Quality Control (,Central-Valley Water--Board)-staff-has <br /> reviewed the Addendum to the Closure and Postclosure Maintenance Plan (herein referred to <br /> as Addendum) and the Construction Quality Control Plan for the proposed extension of <br /> closure cap at the Corral Hollow Sanitary Landfill. The Addendum addresses the extension <br /> closure cap including postclosure maintenance cost and other infrastructure changes. The <br /> Closure Plan and Postclosure Maintenance Plan were last revised in 1995. <br /> The Closure Plan was prepared in accordance with Title 27, §21790(b)(1) through (b)(8) and <br /> §21800. The extension of the closure cap will be funded by the Solid Waste Enterprise Fund <br /> established by San Joaquin County's Resolution R-90-1190. The Discharger estimates the <br /> total cost to complete the extension of the closure cap will be approximately $154,000. The <br /> closure cap extension will utilize a geocomposite clay liner (GCL) as a low permeable barrier <br /> with a maximum permeability of 5x10"9 cm/sec. Onsite soil will be used to construct the erosion <br /> resistant vegetative layer that is capable of sustaining plant growth and the final grade of the <br /> closure cap will be designed with a minimum 3% slope in accordance with Title 27, <br /> §21090(b)(1)(A). Postclosure maintenance of the extension closure cap and related closure <br /> cover will not significantly change from the final Postclosure Maintenance Plan revised in <br /> 1995. The amended Postclosure Maintenance cost is estimated to be approximately $80,000 <br /> annually. These costs are based on 2007 dollars. <br /> The Construction Quality Assurance (CQA) Plan was developed in accordance with Title 27, <br /> §20323 and §20324. The CQA plan describes how the closure cap extension and <br /> construction quality control will be documented to assure the containment system installed <br /> meets the design specifications approved by the Central Valley Water Board. The CQA plan <br /> was prepared by Scott D. Purdy of Vector Engineering, Inc. Mr. Purdy is a California Certified <br /> Engineering Geologist No. 1532. Based on the plan submitted the boundary of the landfill will <br /> be extended north-northeast of the current landfill footprint and will cover an approximate area <br /> of 1.3 acres. It is important to note the extension to closure cap proposed by the-Discharger is <br /> limited to the 1.3 acres and does not extend beyond the Discharger's property boundary. The <br /> known limits of refuse lie beyond the 1.3 acre extension north-northeast of the site boundary. <br /> California Environmental Protection Agency <br /> ca Recycled Paper <br />