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2000-foot Radius Well Search <br /> A 2000-foot radius water production well search was performed using data collected from the <br /> City of Tracy and the Department of Water Resources (DWR) sources The City of Tracy is the <br /> water purveyor In the site area Well locations and well logs are used within the confidentiality <br /> constraints of the DWR The pertinent information is presented on the following Table 4 and <br /> the attached Figure 5 The DWR search revealed the following information which is presented <br /> below <br /> Table 4 Well Search Summary <br /> Well Number/Name Date Drilled Depth Perforations ft Seal Thickness Use Current <br /> Status <br /> Old City Mall Well Aug 1928 130-140 160-180 assumed min 50 ft domes? Unknown <br /> T2S R5E 2801 180-200 <br /> T2S R5E 28A1 Aug 1928 105-145, 182-192 assumed min 50 ft domes Assumed <br /> Wainwright#1 City of 197-207 active City <br /> Trac <br /> Tracy Ice Dev March 1984 120-150 50 ft domes Unknown <br /> T2S R5E 27 <br /> Cal Weiding Sup Nov , 1978 60-80 50 ft domes Unknown <br /> T2S R5E 27C8 <br />• fvlilton Johnson T2S, Aug , 1957 68-76 assumed 20 ft Indus Unknown <br /> R5E 27 NW1/4 <br /> Tracy Elem School July 1951 74-86 530-535, 545- yes domes Active? <br /> T2S R5E 21 K1 549 565-568 <br /> North Side Irr Feb-Apr 1954 numerous below 38 ft no irngat Active? <br /> Dist T2S R5E 22 P1 <br /> Lincoln, City of Tracy Not reported Not reported, assumed 50 ft domes? Active? <br /> T2S, R5E 21 K1('?) assumed s:malar to <br /> Wainwright <br /> domes - domestic or City water use, Indus - industrial, irrigat - irrigation <br /> One City well (Wainwright) is located roughly 1000-feet west southwest and upgradient of the <br /> site The remaining welts are either near the radius perimeter or beyond the perimeter In our <br /> opinion, given the size of the site plume, reported seal lengths and the distance of the wells to <br /> the site, the plume should not be a threat to existing wells assumed to be in service <br /> These wells all are screened or perforated into deeper aquifers in the area where groundwater <br /> yields are very large for the use The site aquifer (uppermost water beating zone occurs <br /> between about 11- to 22-feet, and the aquifer is underlain by an extensive aquitard The <br /> historic high and low groundwater elevations observed at the site are 6 90 and 8 66 <br /> respectively The groundwater levels have remained consistant for this slighlty confined <br /> aquifer and appear typical for shallow, thin near surface aquifer <br /> Page 8 <br />