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March 9, 1988 AGS 038009-1 <br /> Fire Engine Company No. 2, Stockton, California <br /> r+ <br /> MONITORING WELL CONSTRUCTION <br /> The monitoring wells will be constructed with thread-jointed <br /> 2-inch inner-diameter schedule 40 PVC casing. No chemical <br /> cements, glues, or solvents will be used in well construction. <br /> The screened portion of the wells will consist of factory- <br /> perforated 0.020-inch slotted casing. The well screen will <br /> extend from total depth of the well to approximately !0 feet <br /> above the upper zone of saturation to allow sampling at the <br /> ground-water surface during seasonal fluctuations. <br /> The annular space opposite the screen will be packed with sorted <br /> sand to a point approximately 5 feet above the slotted intervals. <br /> A 3-foot bentonite plug will be placed above the sand as a seal <br /> against cement entering the sand pack. The remaining annulus <br /> will be backfilled with neat cement to a few inches below grade. <br /> A cast-aluminum utility box with PVC apron will be placed over <br /> each well head and set .in concrete flush with the surrounding <br /> concrete pad. This box has a water-tight seal to protect:agai.nst <br /> - surface water.- infiltration and requires a specially-designed <br /> 12 <br /> `� Applied GOOSYS IM <br />