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Table 1. 2000-foot Radius Well Search Summary Well Number/ Date Drilled Screens/Perforations Seal Thickness Use Current Location/ Name Depth ft Status Glover April, 1967 130-139 feet yes domes unknown T2S, RSE,22Q1 from 0 to 100 ft Hall March, 1980 56-70 feet yes domes unknown T2S,RSE,22R from 0 to 50 ft Gonzales March, 1978 102-142 feet yes domes assumed T2S, RSE,22Q8 from 0 to 50 ft active Century 21 March, 1987 105-125 feet yes domes unknown T2S, RSE,22Q from 0 to 70 It Upton Aug., 1954 56-85 ft? yes domes unknown T2S, RSE,22 from 53 to 56 ft West Side Irrig April, 1954 34 perforated No irrig assumed T2S,RSE,P1 intervals below 38 ft active Johnson July, 1957 68-76 ft none reported indus unknown T2S, RSE,27 Tracy Ice March, 1984 120-150 It yes domes assumed T2S, RSE,27E 0 to 50 ft active Tracy Equip March, 1987 55-75 ft yes domes assumed T2S, RSE, 27A 0 to 35 ft active M & M Builders' July, 1984 101-121 It yes domes assumed T2S, RSE,27B 0 to 50 feet active Don Most July, 1981 130-150 It yes domes unknown T2S, RSE,27B 0 to 50 feet Calif Welding Nov., 1978 60-80 ft yes domes assumed T2S, RSE,27 I 1 0 to 50 ft active domes - domestic or City water use; indus - industrial; irrig - irrigation, municip-municipal - M&M Builders well number appears to be mis-located, should be section 22. Discussion Regional groundwater flow at the site and in the central Tracy region is northerly. M and M Builders has an on-site well located next the western garage wall. The concrete aggregate plant to the west has one well which is apparently used for on-site water consumption. The remainder of the wells are either side-gradient to, or up gradient of, the subject site. These wells are all screened or perforated into deeper aquifers in the area where groundwater yields are very large. the well screen/perforation log data indicates that most wells tap water in deeper confined groundwater bearing strata. The well logs appear sealed through the shallow aquifer zone with seals extending 30- to 50-feet or deeper. One irrigation well (about 10 0 0- feet west of the subject site) did not report a surface seal on their log. Shallow groundwater has been observed on-site at depths of about 17-feet during underground storage tank removals. Page 2