Laserfiche WebLink
a <br /> a D <br /> Work flan Evaluation of Soil and Ground Water December 4, 1989 <br /> Unocal Station No. 6981, Stockton, California AGS 38032-3W <br /> plug, A 3-foot-thick bentonite plug will be placed above the sand as a seal against cement <br /> entering the sand pack. The remaining annulus will be backfilled with a mixture of cement. <br /> water, and S percent bentonite to grade. <br /> e"3 A cast-aluminum utility box with a PVC apron will be set in concrete flush with the <br /> surrounding station pad at each of the proposed locations. The utility boxes have watertight <br /> seals to protect against surface-water infiltration and require specially designed wrenches <br /> .;.� to open. Each wellhead will also be fitted with a Iocking steel cap. This design reduces <br /> the possibi'.ity of vandalism or accidental disturbance to the well. <br /> MONITORING WELL DEVELOPMENT AND SAMPLING <br /> Water samples will be collected for subjective analysis before purging and development of <br /> the monitoring wells. A sample will be collected from the water surface in each well with <br /> a Teflon bailer cleaned with Alconox and deionized water. Any subjective evidence of <br /> product detected in the wells will be recorded. If no floating product is detected, the wells <br /> will be developed and purged and samples will be collected for laboratory analysis. <br /> After initial water-level:reaFurements,the wells will be developed.approximately 24-hours <br /> ----------- --------------------- <br /> after constriction, using surge-blocking or another suitable method. An air=lift pump will -- ------ ----- '- -be used to remove sand and sill. Water generated during development will be placed in <br /> 20 <br /> -- A�P&a Geosystems - <br />