Laserfiche WebLink
Report on Soil and Ground-Water Evaluation September 11, 1989 <br /> Proposed ARCO Station, Woodbridge, California AGS 39044-1 <br /> of each well consists of factory-perforated casing with 0.020-inch-wide slots and extends <br /> from the total depth of the boreholes to approximately 8 feet below grade in the borings. <br /> The annular space of each well was packed .with No. 3 sorted Monterey sand -to <br /> approximately 3 feet above the top of the screen. A 2-foot-thick plug consisting of <br /> bentonite pellets was placed above the-sand to prevent cement from entering the: sand <br /> pack. -.-The remaining annulus was backfilled with a slurry of water, cement, and bentonite <br /> to the ground surface. The construction details of the individual wells are depicted on the <br /> Logs of Borings. Ms. Eleanor Ratliff of the SJLHD-was onsite during grouting operations. <br /> The wellheads were secured in cast-aluminum utility boxes with PVC aprons. The boxes <br /> have watertight seals and were set in concrete approximately .4 inches above the <br /> surrounding ground surface to reduce surface-water infiltration. - A special-wrench is <br /> required to open the box. This design discourages vandalism and reduces the possibility of <br /> accidental disturbance to the well. Each well was also fitted with a locking well-cap to <br /> protect further against unauthorized disturbance of the well. The wellheads were set above <br /> grade higher than normal so that they will be easily seen when construction begins at the <br /> site and can be adjusted to grade after paving of the site is complete. <br /> 14 <br /> App/ied G&0Systems <br />