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September 9, 2005 NOA Project Number: E05110A 3.7 Expected On-Site Maximum Septic Tank Usage Maximum expected usage on each proposed parcel would be for a primary residence and. secondary 6, dwelling unit. Septic system design should be based on the On-Site WlastewaterDhOsal Standards or ,.other engineering recommendations. 4.0 GROUND WATER INFORMATION 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 official maps available from the County. According to these maps (Plates 3-6),ground water lies between.70 and'90 feet below ground ] surface and flows at a gradient of about 10 feet per mile to the northwest iri the vicinity of the Site. - -No ground water was encountered by the staff of Neil O.Anderson &Associates, Inc. during the drilling to a depth of 25-feet on April 5, 2005 or when drilling to a depth of about 14 feet on April 14, 2005. F, 4.2 Potential Ground Water Contamination Issues `Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, ( and storm water infiltration. Agricultural activities and the use of septic systems in the area should be considered potential ground-water contamination sources. i 4.3 Water Sample Location No well exists on the site. No ermits were found during file review at EHD on August 23 2005. p g � One water sample was taken on August 26, 2005 by Mr. Steve OTlia from the domestic well of the property directly to the south of the subject property. Fj4.4 Water Sample Constituents The water sample was analyzed for nitrate and DBCP. DBCP was not detected in the water sample. Fl Nitrate was found at 18.1 mg/L-NO3;below the maximum contaminant level (MCL) set by the US } EPA of 45 mg/L-NO3. The analytical reports prepared by Precision Enviro-Tech can-be found in / the appendix of this report. F! 4