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<br /> PHASE I
<br /> 4441 west Durham Ferry Road,Tracy,California
<br /> Ucita Pro}oa No.411-91-732
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<br /> Pago 4
<br /> LLMqnJIQdnLWdI C-Jallatii2rl tllid DeVef9nMgrltt
<br /> Two 2-inch-diamcter monitoring wells(MW-2 and MW
<br /> were installed at lite site,and th it locations are
<br /> shown in Figura 2, The wells were constrocted with Schedule 40 PVC riser pipe,0-020 slot-size screen,
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<br /> No. 3 Monterey sand filter pack, and sealed with bentonite and cement grout. Construction details are
<br /> ,srccrnrrft in Anrrendix C. Monitoring wells MW-2 and MAV-3 were screened from 10 feet below the ground
<br /> surface to their completed weli depths of 25 feet. Ail wells, including monitoring well M�1-r, were
<br /> acvetoped after installation by removang approximately 10 well casing volumes of water to remove any
<br /> fine Zrained sediment.
<br /> i � z CArrvPy of R�Trlrritarint•_Well�levatlon�
<br /> On August 28, 1991,Delta personnel surveyed the horizontal location aM the el wations of the top of at each
<br /> (monitoring well casing and the adjacent ground surface in reference lo,a temporary bench mark. The bench
<br /> J ivwk wa3 a utility cover I Kwed in the center of Durham Ferry Road with an assumed elevation of 100 feet.
<br /> -� ;;�.4Sr�,�Water M��Sts:crt>e41s j
<br />`^ r Gruwid water was encount and at Itpprox€rmtely 10 feet bei�w the ground surface during drifting. Depths
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<br /> fp — to ground water were uteasured and recorded fer cacah monitoring we11 on Septemner 4, 1991, aAtd
<br /> October 13 and 20, 1991. All field aneasurements are presented in Table 1. The direction of ground water
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<br /> now on September 4, 1991, was calculated to be flowing toward the southeast, The direction of ground
<br /> water flow on October 13 and 20, 1991,was calculated to be flowing toward the east-northeast at a,gadient
<br /> r , of approximately 0.005 foot per foot. A ground water table contour map was generated using the water
<br /> + level measurements collected on October 13, 1991, and is presented in Figurs 3.
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