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KLEINFELDER <br /> MONITORING WELL INSTALLATION <br /> On April 19, 1988, an additional ground water monitoring well (MW-4) was <br /> installed, developed, and sampled at Food & Liquor Store 37 in Tracy, <br /> California. The monitoring well was constructed in soil boring B-4, <br /> drilled in front of the store. The location of MW-4 is shown on Plate 1, <br /> Monitoring Well Location Map (Attachment A) . B-4 was advanced 26.5 feet <br /> using the same drilling, soil sampling, qualitative field screening, and <br /> decontamination procedures described in our previous report "Food and <br /> Liquor Store #37, Ground Water Assessment Report, Tracy, California," <br /> dated April 12, 1988. Soil samples were retained in refrigerated storage <br /> for future reference or analyses. A chain-of-custody form for the samples <br /> retained in refrigerated storage is included-. in Attachment B of the <br /> report. <br /> I <br /> <Grou`nd__water was first encountered at approximately seven-feet below the <br /> F -- --_ <br /> ground surface. Specific well construction details are included on the <br /> lithologic log for B-4/MW-4 (Plate 2) contained ,in Attachment A and are as <br /> follows: <br /> o The soil boring was drilled with 8-inch hollow-stem augers. <br /> o The well' casing is - 2-inch inside-diameter, flush-threaded`join t, <br /> Schedule 40 PVC pipe. The PVC casing was' steam cleaned prior to <br /> installation in each borehole. <br /> o Well screen section is perforated with 0.010-inch factory-cut slot's. <br /> o The annular- space between the wall of the boring and the casing was <br /> backfilled with Lone Star Industries 0/30: sand to approximately one <br /> foot above the top of the perforated section. <br /> o A 2.5-foot bentonite plug was placed above the sand pack to provide a <br /> seal against surface water infiltration. <br /> o Each well was secured inside a locking well cover. <br /> I <br /> 101-88-604 1 <br /> I <br /> { <br />