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AX RMC LONESTARANAV <br /> 6601 Koll Center Parkway <br /> P.O. Box 5252 <br /> Pleasanton, CA 94566 <br /> (415) 426-8787 <br /> GROUNDWATER MONITORING PLAN <br /> RMC LONESTAR <br /> KERLINGER AGGREGATE PLANT UNCLASSIFIED UNIT <br /> 30350 SOUTH TRACY BLVD. <br /> TRACY, CALIFORNIA <br /> INTRODUCTION <br /> RMC Lonestar maintains an aggregate mining operation at <br /> 30350 South Tracy boulevard Tracy. RMC Lonestar has applied <br /> for and received Waste Discharge requirements for an <br /> unclassified unit at this location. These requirements <br /> necessitate the installation and operation of a ground water <br /> quality monitoring system at the disposal site. The following <br /> work plan sets forth the location, method of installation and <br /> sampling procedure for these wells. <br /> SCOPE OF WORK: <br /> 1) MONITOR WELL INSTALLATION <br /> Three monitor wells will be installed at the Unclassified <br /> Unit to determine the ground water gradient and to obtain <br /> ground water samples for chemical analysis . The approximate <br /> locations of these proposed wells are shown on Figure 1 . The <br /> depth to ground water at this site is believed to be at about <br /> ninety five ( 95) feet. The actual depth of each well will be <br /> determined at the time of drilling based on the depth of <br /> encountered ground water. All wells will be extended at least <br /> twenty five ( 25) feet beyond the depth of first ground water. <br /> All wells will be advanced using a Becker, twin-walled <br /> percussion, pneumatic drilling rig. This type of rig has <br /> been found to be best suited for the gravel and cobble rich <br /> soil found in this area. During the drilling of the monitor <br /> wells soil types encountered in the drill cuttings will be <br /> logged using the USC system of soil classification. <br /> Typical well construction is shown on Figure 2 . All <br /> wells will be constructed of three 4) inch diameter, schedule <br /> 40 , PVC blank casing and 0 . 02 slot screens. Typically, five <br />