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The calculated gradient, using wells MW 1, MW 2 and MW 3, is S 85 <br /> ( E or 951 at 0. 002 ft/ft. Figure 3 depicts the calculated <br /> gradient. <br /> WELL SURVEY <br /> Well information was requested from the City of Stockton, SJCEHD <br /> and the California State Water Resources Board. A physical <br /> survey was also conducted. The information requested was for an <br /> area encompassed by a 2, 000 foot radius circle with the center at <br /> the former UST excavation. <br /> The information for the wells located within a 2,000 foot radius <br /> of the former UST area is shown in Figure 4. <br /> Table 6 contains well locations and available data. <br /> Well data as to depth and diameter was not available for most of <br /> the domestic wells. <br /> TABLE 6 <br /> Well # Address Type Depth Ft. Diameter In. <br /> �. 1 4075 Main Street 5-Mon Wells 75 2 <br /> 2 3440 Main Street Mon Well 45 4 <br /> 3 Carroll/Main St Ind 200 9 co fps+ oct <br /> 4 713 S Coolidge St Ind 250 9 <br /> 5 1031 S Coolidge St Ind 200. 9 <br /> 6 3024 S Guernsey Unk Unk Unk <br /> 7 3014 S Guernsey Unk 50+ 6 <br /> 7 3017 S Guernsey Unk 200 7 <br /> SUMMARY, CONCLUSIONS AND RECOMMENDATIONS <br /> The calculated gradient is S 850 E or 950 at 0 . 002 ft/ft. <br /> Based on the gradient determination, it appears that <br /> contamination from an off site source may be affecting this site. <br /> 10 <br />