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GROUND WATER <br /> Monitoring wells were installed in each'\of the _three borings <br /> dri l l.,=d during this program. F4ctory, =lotted 2 inch PV ': ;_ac- rig <br /> was installed ire each hole. . The slotted cone extended 20 to 25 <br /> feet below water table and approximately 5 feet above water <br /> ta.bl E'. Blank: casing was installed above the slotted .-one, to , <br /> surface. A gravel pack: was installed in each well , using No. 4 ! <br /> sand, to 2 to 5 feet above static water leveI. . A bentonite seal '( <br /> from 1 to b feet thick: was then installed, capped by grout to the ? <br /> surface. A lockable christe box 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. i4 <br /> 1 <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 i <br /> since the wells were installed. Thi=_s 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 /> r.1inC: and by increased stream+1ow in streams within the San- <br /> _agUir - Sacramento River Delta System. The Old giver channel.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 /> i <br /> 11/05/87 <br /> Well Casing Elev. Depth GW Elev. GW <br /> M,W, - 1 14. 04 li? 4. 04 r <br /> 13. 88 7 6. 88 <br /> MW - _ 13. 07 e 5._07 <br /> 12/03/87 <br /> Well Casina Elev. Depth GW Elev. GW <br /> MW - 1 14.,04 6. 75 7. 29 <br /> MW - 2 13.88 6. 60 7. 2$ <br /> MW - 3 1'. 07 5. 90 7. 17 <br /> . . I <br /> i <br /> I <br /> 2 <br />