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..i 0 Underground Asphalt Oil Storage Tanks: There are two underground asphalt oil storage tanks. The tanks are steel in composition and were formerly rail transport tanks. The tanks are located in the southern section of Area "B", approximately 40 feet southwest of the Hot Plant. The "east tank" has a maximum capacity of approximately 20,000 gallons, and the "west tank" has an approximate capacity of 10,000 gallons. 0 Facility Reclamation Plan: The reclamation plan for the facility site calls for eventual reclamation of the entire area to orchards. The Reclamation Plan was first presented as a "Rehabilitation Plan" when the site was originally permitted with San Joaquin County in 1957. In 1989, the Conditional Use Permit was modified to extend the life of the permit for 20 years to allow for continuous rehabilitation of the plant facility area after excavation ceases (CUP # QX-89-2). In 1999, a "Revisions to Approved Actions" was approved with the San Joaquin County Planning Commission to allow for continued use of the processing facility for thirty (30) years from the date of approval, along with ongoing rehabilitation of the site. The site has an approved reclamation plan on record with the State Mining and Geology Board. The California SMARA (Surface Mining and Reclamation Act) Mine Identification Number for this site is 91- 39-0019. 0 Clarification of Water Balance Items: Enclosed please find a revised water balance which replaces "Exhibit F" originally submitted in the 10 February 2006 Report of Waste Discharge. [See "Attachment B"]. Assumptions and data references used in the preparation of the water balance are given on the revised exhibit. Primary resources of information for the development of the balance include: California Department of Water Resources— Precipitation and evaporation data • 12/28/05 Kleinfelder Geotechnical Report—Site percolation rates George Reed, Inc.— Project wastewater generation NorthStar Engineering—Topographic survey of site elevations, pond geometries, and drainage courses It should be noted that the total pond volume shown on the water balance includes two feet of freeboard in all three ponds at the Munn & Perkins site. Furthermore, while the topographic survey conducted by NorthStar included the existing ponds'side slopes and bottoms, the total volume calculation for the ponds assumes constant side slopes and bottom elevations that are based on the field data obtained by the survey. Finally, site runoff entering the ponds was calculated using the rational method. An average runoff coefficient of C= 0.45 was used for each runoff area of the site with the exception of the ponds where a runoff coefficient of C= 1.0 was used. The location and size of each runoff area is shown on "Exhibit H" of the originally submitted Report of Waste Discharge. 0 Wastewater Quality Data- Additional data will be presented in a subsequent report once further clarification has been received per our request dated 12 February 2007.