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• • e e <br />0 <br />California Regional Water Quality Control Board- �.:� <br />Central Valley Region <br />Robert Schneider, Chair .. <br />Terry Tamminen Arnold Schwarzenegger <br />Secretary for Sacramento Main Office <br />Governor <br />Environmental Internet Address: http://wwtiv.swrcb.ca.gov/rwgcb5 <br />Protection 11020 Sun Center Drive #200 Rancho Cordova, CA 95670-6114 <br />Phone (916) 464-3291 <br />MD <br />9 August 2004 E_'' <br />W. Michael Carroll, P.E. AUG 1 1 2004 <br />County of San Joaquin ENVIRONMENT tENLTH <br />Department of Public Works PERMIT/SERVICES <br />P.O. Box 1810 <br />Stockton, CA 95201 <br />DETAILED j.Ul O FOR THE DESIGN AND CONSTRUCTION • PARTIAL COVER <br />FOR MODULES I AND 2 AND FUTURE <br />NORTH COUNTY RECYCLING <br />CENTER AND SANITARY LANDFILL, SAN •.• COUNTY, • <br />513390308003 <br />We have reviewed the subject Report, dated 30 June 2004, submitted to the Regional Board as <br />required by letter dated 16 April 2004 (Water Code 13267 enforcement letter). We appreciate your <br />timely response in this regard. Based on our review, we have several areas of concern that should be <br />addressed prior to final construction. <br />Appendix A, page 3, Slope Stability states, "Based on previous work [emphasis supplied], <br />stability of the refuse fill and partial soil cover at 3H:1 V or flatter slopes should be adequate for <br />both static and seismic forces that could occur, even during wet weather intervals." The <br />previous work was not included in Appendix A. <br />As you know, Title 27 CCR Section 20365 identifies the minimum requirements for <br />precipitation and drainage controls. Section 20370 addresses seismic design for Class III Units <br />as well as Section 21750(f)(5) stability analysis. <br />Please submit an addendum that addresses all the minimum requirements of Title 27 for seismic <br />design and slope stability for the partial cover application at Modules 1 and 2. Ensure that a <br />qualified engineer or engineering geologist signs and stamps the addendum. <br />2. Figure 1 shows stake locations for side slope and top deck cover thicknesses. There does not <br />appear to be thickness measurements along the lower slope outside the Limit of Cover <br />Placement. <br />We request that an investigation with lower slope thickness samples be performed as part of the <br />partial cover construction operation. Please submit an addendum to the Report stating that this <br />sampling will be done, the technique that will be used to measure the cover and how the data <br />will be reported in the field. Please resubmit Figure 1 with the new thickness sampling locations <br />and replacement page that describes this activity. <br />California Environmental Protection Agency <br />0 Recycled Paper <br />