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• Aqua Terra Technologies <br /> of 55 feet which was the ending depth of the PVC casing. The <br /> drill rig was used to pull the well which was completed <br /> successfully. The hollow stem auger served to keep the hole <br /> open after the casing was removed. The hole was then grouted <br /> to the top using a bentonite/cement slurry. A tremmie pipe <br /> was lowered to the bottom of the hole. The grout was <br /> injected into the hole through the tremmie pipe to displace <br /> any water in the hole and to ensure that no voids were <br /> created during the backfilling process. The closure of the <br /> well was completed on the same day. <br /> CONCLUSIONS <br /> In our judgment, the site remediation has been completed, in <br /> accordance with the requirements of the Regional Water <br /> Quality Control Board and the San Joaquin County Local Health <br /> District. Excavation of the concentrated hydrocarbon <br /> contaminants to a non-detectable level by odor and <br /> backfilling the excavation with fairly impermeable soil <br /> should reduce any potential further migration of low levels <br /> of contamination remaining in the soil at 24 feet and 29 <br /> feet. <br /> In permanently closing the groundwater monitoring well, any <br /> potential conduit formed by the sand and gravel pack used to <br /> encase the well at the groundwater depth has been destroyed. <br /> Consequently, any direct communication of the contamination <br /> with groundwater has been eliminated. <br />