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Bird Road Facility Page 3 of 13 Project Number: E07183A November 30, 2007 I.3.4 Existing Seotic Tank Usage in the Vicinity _ In an attempt to determine the septic system density for the vicinity of the Site, our office reviewed a recent aerial photograph of the subject property available from GoogleEarth TM. We counted the building clusters within one square mile of the Site, and made the assumption that each building cluster has one septic system. Using this method, we determined that there are a minimum of approximately 30 septic systems per square mile in the immediate vicinity of the Site. The general area consists of agriculture with a few scattered residences. I.3.5 Septic Permit History in the Vicinity According to a file review at EHD, the septic systems in the vicinity appear to utilize septic systems with leach lines. I.3.6 Seotic Repair Permit History in the Vicinity According to a file review at EHD, the septic system repairs in the vicinity appear to be for the addition of leach lines. I.3.7 Expected On-Site Maximum Septic Tank Usage According to John Wathen and a tentative site plan provided by Wong Engineering, Inc., maximum expected usage on the Site would be for the employees of the truck wash and heavy equipment repair shop. Four trailer spaces will also be available for employees to occasionally stay overnight. The existing residence on the property will be demolished and a new three- bedroom residence will be constructed in its place. Septic system design should be based on the On-Site Wastewater Disposal Standards or other engineering recommendations. Please see section II.3.4.1 of the Nitrate Loading Study for further details regarding waste water flow from the proposed project. I.4 Ground Water Information I.4.1 Ground Water Depth and Gradient The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground water depth and elevation maps were reviewed to determine the ground water levels near the Site. The Fall 1998 and Spring 1999 maps are the most current maps available from the county. Examination of these maps indicates that no water level data is available for the Tracy/Banta area, which includes the Site, and no definite comments as to depth or gradient flow direction can be made. A groundwater boring was drilled by our office for the purpose of storm water pond placement on March 8, 2007; ground water was found to be at approximately 14.5 feet bgs. "04 902 Industrial Way•Lodi,CA 95240.209.367.3701 •Fax 209.369.4228 02007 Neil 0.Anderson&Associates,Inc