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TABLE 6 <br /> Well Construction Details <br /> Former ARCO Service Station No. 2168 <br /> 441 W Charter Way, Stockton, CA <br /> Boring <br /> Elevation Borehole Casing Screened Filter Pack Cement Seal <br /> Well I.D. Construction (TOC feet Depth Diameter Diameter Casing Slot Size Interval Zone Interval feet Bentonite Seal l nterva <br /> Date feet Material ( bgs) Interval Comments <br /> above MSL) bgs) (inches) (inches) (inches) (feet bgs) bgs) (feet (feet bgs) <br /> SP-15 11/15/2005 NA 37 10 1 PVC 0.020 32-34 A 12-26, 31-34.5 10-12,26-31, 34.5-37 2-10 <br /> SP-16 11/15/2005 NA 39 10 1 PVC 0.020 36-38 A 12-26,26-34 10-12,26-34 2-10 <br /> SP-17 11/15/2005 NA 41 10 1 PVC 0.020 36-38 A 12-26, 35-38.5 10-12,26-35, 38.5-41 2-10 <br /> SP-18 11/9-10/2005 NA 37 10 1 PVC 0.020 32-34 A 30-34.5 27-30, 34.5-37 2-27 <br /> SP-19 11/4/2005 NA 37 8 1 PVC 0.020 31-33 A 30-33.5 26-30, 33.5-37 2-26 <br /> SP-20 11/9/2005 NA 37 8 1 PVC 0.020 32-34 A 30-35 27-30, 35-37 2-27 <br /> SP-21 11/14/2005 NA 37 8 1 PVC 0.020 32-34 A 31-34.5 26-31,34.5-37 2-26 <br /> SP-22 11/11/2005 NA 37 8 1 PVC 0.020 31-33 A 29-33.5 26-29, 33.5-37 2-26 <br /> Notes: <br /> EW-1 through EW-17 are nested in the same respective boreholes as SP-1 through SP-17 <br /> bgs=below ground surface <br /> MSL=mean sea level <br /> NA=Not available <br /> A=shallow zone <br /> B=intermediate zone <br /> C=deep zone <br /> Elevations are in US survey feet,Vertical Datum is NGVD29 <br /> • <br /> 02168 3Q06 Tables Page 3 of 3 SECOR <br />