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L December 7,2005 <br /> NOA Project Number: E05141B <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> 6. The 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 /> The Fall 1998 and Spring 1999 maps are the most current offiC,6 <br /> ma le from the County. <br /> According to these maps (Plates 3-6),ground water lies betwe0 d 70 f t below ground <br /> surface and flows at a gradient of about 10 feet per mile to the st in the vicinity of the <br /> L Site. <br /> No ound water was encountered by the staff of Neil O.Anderson &Associates, Inc. during the <br /> � g of a percolation test hole to a depth of 15.98 feet on November 1, 2005. <br /> L 4.2 Potential Ground Water Contamination Issues <br /> L Identifying potential ground-water contamination sources was got part of the scope of work for the <br /> soil suitability study. Potential ground-water contamination can occur from a number of sources <br /> which often include leaky underground storage tanks,agricultural activities, dairies, septic systems <br /> and storm water infiltration. Agricultural activities and the use of septic systems in the area should <br /> be considered potential ground-water contamination sources. <br /> L 4.3 Water Sample Location h <br /> .SJ <br /> _Ongdomestic well exists on the sife. Two permits and a drillers report were found for the address of <br /> 26222 East Mahon Road. The first petmit was issued by the San Joaquin EHD to Joe Joseph on <br /> August 24 LR�6 dor the installation of a new domestic well. On the same permit is a note indicating <br /> I <br /> tha "fhe old we ust be destroyed under permit.' _no permit was found for this well destruction. <br /> The'second peftnit was issued by the EHD to Joe Joseph on September 23, 1976 for the instalration <br /> of a pump at 26222 East Mahon Avenue.The drillers report was recorded for the same owner at the <br /> ` same address on October 2, 1976 from the Department of Water Resources. The permit indicate <br /> that the depth completed for the new well was 190)feet and the depth to groundwater level as <br /> feet. A water sample was taken by Ms. Nancy Rosulek on October 28,2005 from the spigo�the <br /> ` east side of the residence on Parcel one. <br /> 5 <br /> V <br /> L <br />