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iw Project Description —.Report of Composting Site Information i Tracy Material Recovery Facility and Transfer Station 30703 S. MacArthur Drive, Tracy, California 95377 Deifa-Mendota Canal. The Tracy Municipal Airport obtains its water from the City of Tracy. Several businesses and schools in the area operate "public water systems", as.they serve more than the minimum number of users as required by the Public Health Department. Teichert Aggregates and Granite Construction Company obtain process water from deep wells located in the central portion of Section 9, and the northeast portion of Section 17, Township 3 South, Range 5 East, respectively, approximately within one mile of the site. There are two agricultural wells on MacArthur Drive, 0.5 miles north of the site, and 100 feet northeast of the site. Both are downgradient of the site. There are two mobile!'home residences approximately 600 feet northeast of the site.. There is a residential subdivision 1.5 miles north on MacArthur. There is one residence to the south. + The following section "Design Provisions" (in italics) is also redacted from the Report of Waste Discharge prepared by EBA Wastetechnologies in 1993. Design Provisions Storm Water Retention Basin {Percolation Pond) Storm water runoff from all areas except the wood storage and yard waste composting area will drain to an on-site retention pond. The retention pond will be sized to contain 200 percent of the computed volume of runoff from the 10 year/24-hour storm. The pond shall also be designed to empty by percolation and evaporation 100 hundred percent of the L required volume of storage within 10 days. E Evaporation Pond i Storm water runoff from the wood storage and compost concrete pad area will drain to an on-site clay-lined evaporation pond. This pond will have a single clay liner meeting permeability of 1 x 10.6 cm/sec or less and will be sized for the 100 year/24-hour storm. Because the evaporation pond is conservatively sized for the 100 year/24-hour storm, it also meets the draft provisions of Composting Facilities Permitting Procedures and Enforcement (Section 17873, Chapter 3.1, Title 14 CCR) requiring the design to contain and collect twice the anticipated volume of compost leachate and the precipitation from a 25 year/24 hour rainstorm event. The compost leachate management system, which includes the evaporation pond, has been designed to recycle the collected compost leachate to the compost processing area or to evaporate the compost leachate within 20 days. The evaporation pond is sized for the quantity of runoff estimated to be generated from 100 year/annual precipitation event from the Compost Pad surface area. Water balance calculations were modeled on a monthly basis by summing runoff generation, direct' rainfall on the pond surface, and evaporation from the corresponding water surface area. The volume of runoff at the end of a month was then correlated to a specific depth based on the pond geometry. The evaporation pond is sized with two feet of freeboard in order to accommodate runoff from the 100 year/annual precipitation event. 13 ;E I Edgar&Associates,Inc. Tracy Compost Fac ProjDesc121907 p