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� <br /> | <br /> ` ! <br /> This unit is underlain by at least 10 feet of light brown, | <br /> micaceous, clayey silt ( Ml /Cl ) . This unit has lowplasticity <br /> and varies from stiff to very stiff in consistency. It was <br /> logged as Ml /Cl in each of the three wells orilled for this . <br /> program. ' <br /> � <br /> / <br /> As can be seen from the logs the soils underlying the sit-,-! | <br /> ' , | <br /> are lithologically consistent over the area that was � <br /> investigated. There are no major pinch opts, cut outs, or other <br /> stratigrawhic discontinuities present. | <br /> Soils samples were taken at 5 foot intervals with a Mooified <br /> California split spoon samolar. These samples were sealed with � <br /> tinfoil , capped with plastic lids, sealed with tape and <br /> ' transported to California Water Labs of Modesto. The samples | <br /> were analysed for Total Petroleum Hydrocarbons including QTX. No <br /> contaminantes were detected huring the lab analysis. <br /> � GROUNDWATTPRI <br /> Monitoring wells were installed in each of the three borings <br /> ^ drilled during this program. Factory slotted 2 inch PVC casing <br /> was installed in each hole. The slotted zone extended 20 to 25 <br /> � <br /> feet below water table and approximately 5 feet above water � <br /> i table. Blank casing was installed above the slotted zone, to | <br /> ` surface. A gravel pack was installed in each well , using No. 4 | <br /> | <br /> sanc, to 2t 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 lockable christe box was then installed to protect <br /> the well from tampering. DetaiIstof the well construction for } <br /> | <br /> each well are shown on the logs, in the well graphic column . | <br /> i <br /> � <br /> Ground water occurs at shallow depths under water table ` <br /> conditions at this site. Water levels have been measureo several <br /> times since the wells were installed on 11/5/87. The wells were <br /> � measured on 11 /5/87, just after they were installed; on 12/03/87; � <br /> and on 12/21/87. | <br /> / <br /> The readings taken on 11 /5/87 were not used to determine ( <br /> ground water gradient, since the water table was most Hkely � <br /> disturbed by drilling operations. Readings taken on 12/03 and <br /> 12/21 , were used to determime both ground water gradient and <br /> magnitude at the site. This was done in early 1988, by means of � <br /> graphical three point problems. The solutions to these problems <br /> are as follows: <br /> 12/03 -- N 49. 5 W @ . !4 it / 100 ft <br /> 12/21 @ ~i* it / 100 it <br /> As one can easily see, the ground water conditions changed / <br /> greatly between the two readings. In addition to the change in <br /> direction and gradient of the water table, the water level rose <br /> adout one foot between the first and second readings. <br /> . � <br /> ! <br /> i <br />