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e.L7­1 <br /> a <br /> '+ - <br /> --A <br /> Mitigation Work Plan AGS 86102-2P <br /> Beacon Station #3-992, Manteca, California May 2E, 1987 <br /> the sand pack. The remaining annulus will be backfilled with <br /> neat cement to grade. The San Joaquin Local Health District will <br /> be notified prior to installation of the san!,tary seal. A <br /> utility box will be set in concrete flush with the surrounding <br /> surface grade. The utility box will have a water-tight seal to . <br /> protect against surface water infiltration and require a <br /> specially designed wrench to open. This will reduce the <br /> possibility of well vandalism or accidental disturbance. <br /> f Field tests will be conducted to evaluate the transmissivity of <br /> the wells with respect to soil vapor. These tests will provide <br /> the data necessary to specify the most appropriate air blower or <br /> vacuum pump system. When the system becomes operational., soil <br /> vapor will be withdrawn from the soil by applying a vacuum to the <br /> appropriate well heads.`. The vapor will .be vented to the <br /> atmosphere, within.guidelines set by the San ,Joaquin Local Health <br /> District's Air Pollution. control District. Total discharge will <br /> be regulated by treatment or by varying the rate of withdrawal oY <br /> daily length of operation. We anticipate that at least two of <br /> the vadose wells will be used as air inlet wells. <br /> j. <br /> f z _ <br /> 8 <br />