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r <br /> GROUND WATER <br /> Monitoring wells were installed in each of the .three borings <br /> drilled during this program. Factory =lot}Ed 2 inch PVC casing <br /> was installed in each hole. ' The slatted zone extended 20 to 25 <br /> feet below water table and approximately 5 feet above water <br /> tpble. Blank: carina was installed above the slotted zone, to <br /> surface. A gravel pack was installed in each well , using No. 4 <br /> sand, to 2 to 5 feet above static water level . A bentonite seal <br /> from 1 to 6 feet thick. was then installed, capped by grout to the <br /> surface. A 1ocF::able christe bo:: was then installed to protect <br /> the well from tampering. Details of. the well construction for <br /> each well are shown on the logs, in the well graphic column. <br /> Ground water occurs at * shallow depths under water table <br /> conditions at this site. Water levels have been measured three <br /> separate times since the wells were installed on 11/5/87. These <br /> measurements show that the ground water table has been rising <br /> since the wells were installed. This is to be expected, since <br /> the winter rainy season had not yet begun when the wells were <br /> installed; but has gotten into full swing since then. <br /> The shallow water table is being recharged by the winter <br /> reins , and by increased streamflow in streams within the San <br /> Ic-mquir. - Sacramento River Delta System. The Old River channel <br /> of the San Joaquin River is about 1. 5 miles north of the site. <br /> The water levels and elevations for each well at the site <br /> are as follows: <br /> 11/05/87 <br /> WL-11 Casing Elev. Depth GW Elev. GW <br /> 14. 04 10 4. 04 <br /> !'k! - 2 13.88 7 6. 88 <br /> r <br /> MW - .3 13. 07 8 5. 07 <br /> 12/03/87 <br /> Well Casino Elev. Depth GW Elev. GW <br /> MW - 1 14.04 6. 75 7.29 <br /> MW - 2 13.88 6. 60 7. 28 <br /> MW - 3 13.07 5. 90 7. 17 , <br /> 2 <br />