Laserfiche WebLink
y , <br /> KEI-P91-0202 .P3 <br /> • October 16, 1991 <br /> Page 3 <br /> 4 . The exploratory borings will be sealed with either neat cement <br /> grout or 11-sack cement sand slurry from the base of the <br /> boring up to the surface. <br /> 5. Finalized Boring Logs will be prepared from field logs and <br /> submitted to the San Joaquin County Public Health Services, <br /> and to the Regional Water Quality Control Board (RWQCB) , <br /> Central Valley Region. <br /> 6. Static ground water level is anticipated at approximately 74 <br /> to 75 feet below grade, based on the ground water level found <br /> in the existing monitoring wells. <br /> 7 . Well Construction: <br /> Casing Type: Schedule 40 PVC, flush threaded joints, 0. 020 <br /> inch factory slot, two-inch diameter. Screen to run from <br /> total depth of the well to approximately 5 feet above the <br /> depth of the first encountered ground water. Monterey sand <br /> (#3) will fill the annular space from total depth to 2 feet <br /> . above the perforated casing interval. A two foot thick ben- <br /> tonite seal will be placed in the annular space on top of the <br /> sand pack. Neat cement grout or 11--sack cement/sand slurry <br /> will be placed on top of the bentonite seal to the surface. <br /> Well casings will be secured with a waterproof cap and a <br /> padlock. A round, watertight, flush-mounted well cover will <br /> be concreted in place over the top of each casing. <br /> S. Water levels will be measured with an electronic sounder. The <br /> wells will be developed using a surface pump in conjunction <br /> with a surge block, approximately one week after well comple- <br /> tion. Wells will be pumped until expelled water is clear and <br /> free of turbidity. A turbidity measurement will be taken upon <br /> completion of well development activities. Effluent generated <br /> during well development will be contained in DOT-approved <br /> drums and hauled from the site by a licensed hazardous materi- <br /> als hauler. <br /> Casing elevations will be surveyed by a licensed land surveyor <br /> to Mean Sea Level and to a vertical accuracy of 0. 01 feet. <br /> 9. Ground Water Sampling: <br /> The wells will be purged with a surface bailer approximately <br /> four casing volumes prior to sampling, at least 72 hours after <br /> . development. After a minimum of four casing volumes have been <br /> purged, water samples will be collected from the wells using <br />