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►. �� KLEINFELDER EXPECT MORE ., trucks. The semi-truck dealership will remain. The proposed development will encompass approximately 15.4 acres of the 23.64-acre site. An on-site septic/leach field system will provide sewage disposal and will be located in the northern area of the development. A 100 percent septic system replacement area, if needed, will be located in the eastern area of the project site. A new well and storage tank will provide water for domestic and fire use. A map showing the project site plan and approximate location of the septic/leach field and well is presented on Plate 2. We understand that the Pilot Travel Center will have 74 public parking spaces and 113 semi-truck parking spaces (187 total parking spaces) and employ 18 employees per shift. According to the San Joaquin County Onsite Wastewater Disposal Standards (page 13 of 25), service stations and restaurants should be considered to have a water use of 10 gallons per vehicle served per day and 35 gallons per person per day, respectively. For the purpose of our nitrate loading calculation, we have estimated the average waste/sewage flow per week for the project site as follows assuming 3 eight hour shifts per day and a maximum of 250 vehicles per day: ((18 people per shift x 3 shifts per day x 35 gal per person) + = 30,730 pal/week (250 vehicles per day x 10 gal per vehicle]) x 7 days) 3. PRESENT AND PAST USE The project site currently consists of a semi-truck dealership, asphalt paved parking area, retention basin, soil stockpile area, and a vacant field. Other structures which may have been previously located on the parcel are unknown to us. The asphalt paved parking area and soil stockpile area do not appear in a historical aerial photograph taken May 23, 1993. The two dealership structures were observed in this ` photograph; however, the larger structure located in the western area appears to have been expanded in recent years. The vacant field appears to have been an orchard at the time the photograph was taken. The May 23, 1993 photograph is presented on ` Plate 3. 4. SEPTIC PERMITS AND PERFORMANCE SJCEHD files were searched to identify septic and well permits at parcels' in the project vicinity. There were no permits on file for the subject parcel. Twenty-four permits were reviewed for parcels located adjacent to or near the subject property. These permits were for new installations and repairs/additions to existing septic systems, new wells, and repairs and destruction of wells. The permitted sewage disposal systems were for conventional septic/leach field systems. The permits viewed and a summary of information obtained from the permits are presented on Plate 4. L 82946.G01/ST07R401/SJW:ly/Ir May 30,2007 0 2007 Kleinfelder Page 2 of 8