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r R CqDkCarnp Dresser&McKee Inc. Memorandum To: Mike Miller, City of Stockton From: Wayne Pickus, CDM ,l Bill Brick, CDM Date: October 6, 1998 Subject: Austin Road Landfill—Landfill Capacity Calculations The purpose of this memorandum is to present information on the remaining site life at the Austin Road Landfill (ARL) under pre-expansion permit conditions. The City of Stockton (City)is required to report remaining landfill capacity to the California Integrated Waste Management Board on an annual basis and to Forward Landfill on a quarterly basis. In addition,this information will be used to assist in the City's landfill sale process and to guide the development of a site fill-sequencing plan. The remaining refuse capacity of the landfill was determined by calculating the volume difference between existing landfill grades as reflected on the August 1998 topographic map,and final grades proposed for the pre-expansion area. The pre-expansion final contours,as depicted in Figure 1,were established in Drawing P-2 of the ARL Report of Disposal Site Information(RDSI) dated November 1996. The volume calculations were performed using the Earthworks software package developed by Softdesk,an engineering tool used in conjunction with AutoCAD. In performing the calculations,it was assumed that a four foot depth was required to construct the final cover system prior to initiating the vertical expansion. The calculations provide both a cut and fill quantity when comparing the two map surfaces:shown in Figure 1. Areas of the site have been filled above grades established irr.the`1996 RDSI. For these capacity estimates it was assumed that the total fill volurrie-:N s available'for waste disposal,and that waste placed above pre-expansion final-grades would the excavated and disposed on-site in other areas. The remaining volunie'was d `791,000 cubic yards. Capacity Calculations The volume available for waste disposal is the total air space minus the portion of the volume consumed by intermediate and daily cover. A refuse to cover soil/alternative daily cover ratio of 4:1 was applied to the calculations for ARL. This represents a total air space available for waste disposal of 80%,or 632,800 cubic yards. Site life estimates were determined based on the following assumptions: 0 Incoming Tonnage: 550 tons per day.