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P. There were no detected concentrations of carbamates, organophosphates, or fumigants in any of <br />the soil samples collected for the applicable analyses from borings B-1 through B-8. Please refer <br />to Table 2 of this report for a complete listing of analyses and results. <br />Soil samples collected from the soil borings advanced during the installation of the monitoring <br />wells appear to also display typical background concentrations seen within California for the <br />metals included in this assessment. All of the detected metals concentrations were below the <br />average values for the listed metals in soil for California. Additionally, all of the metals <br />concentrations detected in each of the soil samples analyzed were below the PRGs. Please refer to <br />Table 3 for a complete listing of the metals analyses and results. <br />The analyses of the soil samples analyzed for the fertilizer constituents ammonia as N, nitrate as <br />N, TKN, nitrate+nitrite, total nitrogen, phosphate, and sulfate showed the following results. <br />Select Soil Results (Monitoring Well Soil Borings) <br />Analyte Concentrations (mg/kg) <br />Sample Location <br />and Depth <br />Ammonia as <br />N <br />Nitrate-as <br />NO3 <br />Nitrate + <br />nitrite TKN Total <br />Nitrogen b <br />Phosphate Sulfate <br />PRG NA NA NA NA NA NA NA <br />MW-1-1' 4.8 16 4 500 500 73 70 <br />MW-1-5' 1.6 14 3 200 200 14 40 <br />MW-1-10' 2.1 7 2 ND<100 ND<100 ND<5 ND<10 <br />MW-2-1' 156 864 195 800 1000 56 10 <br />MW-2-5' 13.2 592 134 1000 1100 65 40 <br />MW-2-10' 18 330 75 300 400 29 30 <br />MW-3-1' 2.9 46 10 200 200 31 10 <br />MW-3-5' 1.7 18 4 100 100 13 ND<10 <br />ND = Not detected at or above the laboratory reporting limit. <br />NA = PRG not applicable to analyte. <br />6.1.3 GROUNDWATER RESULTS <br />The groundwater flow direction and gradient were assessed using the most recently data gathered <br />from the three monitoring wells installed on the site. The groundwater flow direction was <br />calculated using a 3-point triangulation method. The groundwater flow direction was calculated to <br />be towards the northwest with a gradient of approximately 0.001 feet per foot. The groundwater <br />gradient is considered to be relatively flat and consistent with the hydrogeology of the area. See <br />Plate 3. <br />27125.E01 / STO4R181 Page 16 of 23 <br />© 2004 Kleinfelder, Inc. February 13, 2004 <br />KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209) 948-1345 (209) 948-0621 fax