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ac <br /> 5 <br /> 1 <br /> AGS Job NO. 030032-2 <br /> June 1, 19538 Stockton California <br /> rs;e� UNOCAL Service •station No. 6961, <br /> sampling of the air/water interface representive of the formation <br /> r`. <br /> during seasonal fluctuations of ground-water levels. <br /> The annular space opposite the slotted casing wi1.1 be packed with <br /> sorted sand to a point approximately 2 feet above the slotted <br /> interval. A 1- to 2-foot-thick bentonite plug will be formed by <br /> placing bentonite pellets above the sand as a seal against cement <br /> entering the :and pack. The remaining annulus will be backfilled <br /> with neat cement to grade. <br /> A cast aluminum utility box with a PVC apron will be set in <br /> concrete flush with the surrounding station pad at each of the <br /> proposed locations. The utility boxes have water-tight seals to <br /> ce water infiltration and require specially <br /> protect against surfa - <br /> designed wrenches to open. Each well head will also be fitted <br /> with a locking s�.eel cage. The possibility of either well <br /> vandalism or accidental disturbance to the well will thus be <br /> reduced. <br /> MONITORING WELL S201PLING <br /> y <br /> The monitoring wells will be developed, purged, and sampled if no <br /> floating product is detected. After an initial. water-level <br /> Applied Geosystems <br /> - <br />