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4"PVC embedded (feet) <br /> _2 <br /> Work Plan—Well Construction cover w/cap <br /> This is an addendum to the Work Plan which will describe the well construction and methods. <br /> Please see"Staten Multibenefit Monitoring Plan—Section 4:Subsidence"for site history,purpose,and PVC Casing -1 <br /> scope of the proposed project as it relates to the proposed monitoring wells. Above Ground <br /> Please we HydroFocus Health and Safety for the health and safety plan. annular seal-cement <br /> A well construction schematic and a site map is provided with the application materials. ■ bentonite <br /> Land Surface o <br /> LJ Sch.40 1.5"pvc casing <br /> Well Construction ® sand filter pack <br /> A 6"borehole will be dug using a 6"hand auger to a depth of 6ft below the ground surface.The well 6"Dia Borehole—� <br /> casing will consist of 1.5"Sch.40 PVC that will extend from the bottom of the borehole to 211 above ® 0.020 slotted screen <br /> ground surface.The casing will be screen with 0.020 slot size from depths 3-5ft.The casing will be fitted 1 <br /> with an endcap at the bottom of the borehole. <br /> The filter pack will consist of#3 Sand placed via tremie pipe.The filter pack will fill depths 2-6ft.A <br /> bentonite grout using medium bentonite ships will be used as the transitional seal filling the annual space <br /> from depths 1-211.Neat cement,mixed according to CA Well Standards Bulletin 74-90,will fill the Z <br /> remaining annual seal to the ground surface,depths 0-Ift. <br /> A capped 4"PVC cover will be fitted over the exposed well casing and into the neat cement seal to <br /> protect the exposed well casing.The top of the well casing will be fitted with a locking cap. <br /> Excavated material and other waste generated from the well construction will he collected by field <br /> personnel for proper disposal off-site. <br /> 3 <br /> Measurements and Samples <br /> No groundwater samples are planned to be taken from the wells. <br /> 4 <br /> Groundwater levels will be recorded periodically with an electric sounding instrument.In-Situ TROLL <br /> transducers will be deployed in each well for continuous water level monitoring for the duration of the <br /> project. <br /> :.:•:•:�'•'•'•' 5 <br /> PVC end cap <br />