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C <br />OP'0.V N C <br />y< THOMAS R. FLiNN <br />DIRECTOR <br />'OSI FOPI� <br />THOMAS M. GAU <br />CHIEF DEPUTY DIRECTOR <br />MANUEL SOLORIO <br />DEPUTY DIRECTOR <br />STEVEN WINKLER <br />DEPUTY DIRECTOR <br />ROGERJANES <br />BUSINESS ADMINISTRATOR <br />January 10, 2007 <br />Mr. Todd Del Frate <br />California Regional Water Quality Control Board <br />Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670 <br />P. O. BOX 1810 - 1810 E. HAZELTON AVENUE <br />STOCKTON, CALIFORNIA 95201 <br />(209) 468-3000 FAX (209) 468-2999 <br />www.sjgov.org/pubworks <br />ENVI€ OMAL vT HEALTH <br />PEPIiIT/SERVICES <br />SUBJECT: 30 PERCENT DESIGN FOR PROPOSED VERTICAL EXPANSION, <br />NORTH COUNTY RECYCLING CENTER & SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed please find the 30 Percent Design Report for Vertical Expansion of the North County Recycling <br />Center and Sanitary Landfill (NCRC&SL), dated December 12, 2007. This document provides the <br />information you requested regarding the increase in permitted height of the NCRC&SL from 190 to <br />320 ft msl. <br />In summary, we are pleased to report that the proposed vertical expansion can (and will) be designed to <br />meet regulatory and engineering requirements satisfactorily as follows: <br />• Storm water drainage facilities can carry runoff from a 100 -year, 24-hour storm in accordance <br />with CCR Title 27 Section 20365 <br />• Liner system can withstand the load of the refuse to the proposed fill height <br />• Leachate collection components can withstand the load of the refuse to the proposed fill height <br />• Slope Stability is provided with a factor of safety of 1.5 or greater <br />The design criteria associated with the new refuse fill will be applied to all future landfill modules. <br />In addition, potential height increase over the existing modules was also evaluated. Because <br />construction differs between these modules, each was found to have different limits, as follows: <br />Maximum Refuse Fill Depth Maximum Elevation Allowed <br />Over Module Base (Approximate - msl) <br />Module 1 136 ft 235 ft <br />(Previously designated "1 &2") <br />Module 3 166 ft 230 ft <br />Module 4 243 ft 305 ft <br />These criteria were used to establish the contours over the existing modules, with slopes and fill heights <br />coordinated with the depths possible over future modules (Drawing 1). This analysis required a slight <br />adjustment from the initial conceptual contours, providing slightly less increase in fill volume; however, <br />increase in fill capacity remains significant and all applicable regulatory requirements appear to be met. <br />