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WORK PLAN 0 • <br /> FOR GROUND WATER WELL INSTALLATION AND MONITORING <br /> PORT OF STOCKTON-ROUGH AND READY ISLAND,CALIFORNIA <br /> EPA Method 9081 will be performed on soil samples in order to determine cation- <br /> exchange capacity by summation. <br /> 3.2.3 Monitor Well Construction <br /> Five wells will be 20ft deep and five wells will be 35ft deep. All ten monitor wells will <br /> be constructed using 2-inch diameter schedule 40 PVC. The screen will contain factory <br /> slots of 0.020-inches and will be surrounded with a sand filter pack of #3 sand, or <br /> similar. The depth of the grout seal for the 20ft wells will be 6ft, and the depth of the <br /> grout seal for the 35ft wells will be 11ft. A tremie pipe will be used, and the grout seal <br /> will be pumped. The grout seal will be completed with neat cement. The wells will be <br /> completed above ground surface and secured with an above-ground well protect — <br /> well casing will be protected with concrete, and a stove pipe will be installed <br /> protective bollards will be installed for each monument. <br /> The following summarizes the construction details for wells to be completed in tl <br /> w <br /> layer and underlying sandy zone: <br /> � e <br /> Peat Layer Wells: <br /> The bottom of the screen zone will be placed near the base of the peat layer. The <br /> will be 5 feet long or no more than 1 foot below the top of the peat layer, whichever is <br /> less. <br /> Sandy Zone Wells: <br /> The screen zone will extend from the top of the sandy layer down approximately 5 feet <br /> or to the base of the sandy layer, whichever is less. Sandy zones less than 1 foot thick <br /> will not be screened, or will be connected with an underlying sandy zone if the <br /> intervening clay layer is less than 1 foot thick. <br /> 3.2.4 Well Development <br /> The monitor wells will be developed by pumping. The development water will be <br /> monitored for electrical conductivity, pH, and turbidity. When these parameters have <br /> stabilized to within 10 percent of successive measurements, the well will be considered <br /> adequately developed. All development water will be placed on the ground. <br /> 3.2.5 Survey Well Locations <br /> September 2014 10 Environmental Risk Services Q r <br /> Corporation %o 0 <br />