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L L June 12,2006 NOA Project Number. E06061A L ✓Perched ground water was encountered by the staff of Neil O.Anderson&Associates, Inc. at three to ten teet below ground sur ace during drilling of preliminary test bormas on May 24.2ese borings were not completed into percolation test holes. At the location of the completed shallow ercolation test hole,drilled on May 31,2006,no ground water was encountered within five feet below� he�wttottom of the test o e. L ✓4.2 Potential Ground Water Contamination Issues Identifying potential ground water contamination sources was not part of the scope of work for the V 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. Any past agricultural activities and the present use of septic systems in the area should be considered potential ground water contamination sources. LAccording to the DBCP and Nitrate Detections in Water Wells map prepared by the EHD and dated lk November 21, 2005, five wells within a 1.25-mile radius of the subject property have been tested for DBCP,and four have been tested for nitrate. Nitrate was detected at less than 22 parts per million (ppm) in two of the wells, and DBCP was detected at less than 0.2 parts per billion (ppb) in one of the wells;the remaining wells were non-detect for these constituents. /4.3 Water Sample Location LOne domestic and one agricultural well are located on the Site. One well permit was found for the Site address of 10112 East Woodbridge Road during file review at EHD on May 23,2006. The permit is dated May 24, 1994,and is for a system repair at the ""' irrigation well. The location of this well was confirmed during the field work for this study; one domestic well was also observed. The locations of the wells are indicated on Plate 1. s One water sample was collected from the closest hose fed by the domestic well on May 11,2006. The sample location is depicted on Plate 1. /4.4 Water Sample Constituents The water sample was analyzed for nitrate and DBCP. Ni was found at 50.8 mg/L-NO3 in the domestic well, above the maximum contaminant level (MCL)_'getbX the US EPA of 45 mgt ' DBCP was not detected in the water sample. The analytical reports prepare ey�GL L Environmental of Stockton,California can be found in the appendix of this report. lir L 5 60 6, `�