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L November 3,2004 <br /> NOA Project Number: E040119A <br /> 3.7 Expected On-Site Maximum Septic Tank Usage <br /> Maximum expected usage on each proposed parcel would be fora new primary residence and anew (1-211?;-59 <br /> second dwelling unit. If any other buildings in addition to the primary residence and second <br /> dwelling unit were proposed (such as a labor camp),the EHD may require additional studies. The <br /> L proposed septic systems should be based on the On-Site W/astemater Disposal Standards or other <br /> engineering recommendations discussed in this report. <br /> L4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> LThe San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the Site. <br /> LThe ground water contours in the area of the Site are not drawn on the ground water map. <br /> Ground water was found to exist between approximately three (3) feet below the ground surface <br /> several ground water borings excavated adjacent to percolation test borings on the site. We noticed -/) <br /> L that the water level fluctuates within our percolation test boring and in ditches due to island <br /> pumping and tidal fluctuations. <br /> 4.2 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> L Soil Suitability Study. A Surface and Subsurface Contamination Report addressed this issue (NOA, <br /> 2004). Please refer to this report for descriptions. Ck -31, al- <br /> 44&--t <br /> Cha ff;u6cbC4+J#Aa .flu) <br /> ` In general,potential ground-water contamination can occur from a number of sources which often <br /> include leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm <br /> water infiltration. Any past agricultural activities and the present use of agriculture and septic <br /> systems in the area should be considered potential ground-water contamination sources. <br /> 4.3 Water Sample Location <br /> A groundwater sample was not collected for this report since there were no water wells on the Site. <br /> However, two samples were collected, on October 29, 2004, as part of the Soil Suitability study for <br /> PA-04-286 located on the southern portion of McDonald Island. It was taken at two water well <br /> locations noted on the Well Sample Locations in the appendix (Plate 5). The water sample results <br /> for PA-04-286 are provided in this report since the wells are located near the subject property and <br /> owned by the same client. <br /> 4 '044 <br /> L <br />