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California Regional ater Quality ControlBoarda Central Valley Region Robert Schneider,Chair Winston H.Hickox Gray Davis Secretary for Fresno Branch Office Governor Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 Protection 3614 East Ashlan Avenue,Fresno,California 93726 f( Phone(559)445-5116•FAX(559)445-5910 UUU�� C I.`� v 12 November 2002 NOV 14 20OZ W. Michael Carroll, PE ENVIRONMENT HEALTHPERMIT/SERVICES County of San Joaquin Department of Public Works P.O. Box 1810 Stockton, CA 95201 REPOR l OF WASTE E DISClZlYR GE, FOOTHILL SA Yl l AR l LA DF LLI CALA Y i'.RAS COUNTY(Case No. 1928) We have reviewed the Report of Waste Discharge (ROWD) for the Foothill Sanitary Landfill regulated by Waste Discharge Requirements (WDRs) Order No. 94-258 and applicable laws, regulations, plans, and policies of the Regional Board. Based on our review, we find that the ROWD is incomplete. As discussed on 7 November 2002, we propose to begin a more detailed review of the ROWD while simultaneously drafting Tentative WDRs. The ROWD must be complete prior to the Board considering adoption of the revised WDRs. In this regard, we have focused our completeness review on the liner system design to expedite the process based on San Joaquin County's urgent request. During our telephone conversation of 6 November 2002, we discussed the necessity to upgrade the bottom liner design based on a recent decision by the Board. We require that 12 inches of prepared subgrade be incorporated into the bottom liner design of the engineered alternative geosynthetic membrane/geosynthetic clay liner(GM/GCL). The following language gives you an either/'or option. Each option must be supported by the appropriate testing protocol and construction standards. At a minimum, Appendix G, Site Earthwork (Section 02200), construction quality assurance (CQA) plan, liner design descriptions in other sections of the ROWD, and applicable drawings must be updated to reflect the following language that will be incorporated into the Tentative WDRs: a. An engineered alternative composite bottom liner system that is comprised, in ascending order, of the following: 1) A twelve-inch thick engineered soil foundation laver that shall be constructed of select fine- grained soil materials which shall be compacted in lifts of six inches or less to 90% of maximum dry density at 0% to 4%wet of optimum moisture content, in accordance with the approved constriction quality assurance plan, and shall be either: a) Compacted to attain a hydraulic conductivity of 1 x 10-5 cm/sec or less; or b) Meet the following gradation criteria: California Environmental Protection Agency CO 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/rwgcb5