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3 A CDMCamp Dresser AcKee Inc. &V One Walnut Creek Center engi'leef#v 100 Pringle Avenue,Suite 300 cOns"ct'On Walnut Creek,California 94596 Tel:925 933-2900 Fax:925 933-4174 January 29,1999 F; C L 73 V t �7 7" Mr. Codey Begleycl- California Integrated Waste Management Board Permitting and Enforcement Division T() 8800 Cal Center Drive C-0 "10 Sacramento,CA 95826 Subject: Austin Road Landfill Fill Sequencing Plan(SWFP#39-AA-0001) Dear Mr.Begley: Camp Dresser&McKee Inc. (CDM)is pleased to submit for the City of Stockton this letter report presenting the Fill Sequencing Plan(Plan)for the Austin Road Landfill (ARL). The purpose of the Plan is to guide waste disposal operations over the pre-expansion area of the site. The Plan has been prepared in accordance with the requirements of Solid Waste Facility Permit#39-AA-0001. Figure 1,Fill Sequencing Base Map,depicts the final contours of the subgrade of the pre- expansion area prior to placement of the final cover. A four-foot final cap section has been specified in the ARL Report of Disposal Site Information(RDSI) dated November 1996. Subgrade contours depicted in Figure 1 were developed based upon final grades shown in Figure P-2 of the RDSI and existing site conditions as of August 1998. The landfill permit provisions considered in developing the final fill subgrades include: • Maximum elevation of 90 feet mean sea level,and c�,�&i�before December 31, 2002. 4 �\ • Disposal operations in the pre-expansion Fill Sequencing Areas of remaining fill capacity in the pre-e� ansion esented in Figure 2,Fill lk� fl r n Sequencing Areas. Contour lines in green d epth of fill remaining as of the August 1998 flyover. The pre-expansion area has been subdivided into six distinct fill areas. Table 1 fists the remaining capacity in each sub-area,and provides the estimated time period required to reach capacity. The sequencing of the subareas was developed to complete discrete areas of the site to facilitate the placement of interim cover and to promote site drainage. Modifications to the fill sequencing reflected in Figure 2 may occur to accommodate future operational conditions such as placement of wet-weather pads and internal access roadways. Fill capacities are based on an assumed in-place density of 1000 lbs. per cubic yard,a 4:1 refuse to cover soil ratio,and an average of 575 tons per day waste disposal rate.