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Appendix A <br /> 10 feet below first-encountered water level The screened interval will allow for seasonal <br /> fluctuation in water level and for monitoring floating product A threaded or slip PVC <br /> cap is secured to the bottom of the casing The slip cap can be secured with stainless <br /> steel screws or friction, no solvents or cements are used Centering devices may be <br /> fastened to the casing to ensure even distribution of filter material and grout within the <br /> borehole annulus The well casing is thoroughly washed and/or steam cleaned, or may be <br /> purchased as pre-cleaned, prior to completion <br /> A filter pack of graded sand will be placed in the annular space between the PVC casing <br /> and the borehole wall Sand will be added to the borehole through the hollow stem of the <br /> augers to provide a uniform filter pack around the casing and to stabilize the borehole <br /> The sand pack will be placed to a maximum of 2 feet above the screens, followed by a <br /> minimum 1-foot seal consisting of bentonite pellets <br /> Cement grout containing 5 percent bentonite or concrete will be placed above the <br /> bentonite seal to the ground surface A concrete traffic-rated vault box will be installed <br /> over the monitoring well(s) A watertight locking cap will be installed over the top of the <br /> well casing Reference elevations for each monitoring well will be surveyed when more <br /> than two wells will be located on site Monitoring well elevations will be surveyed by a <br /> California licensed surveyor to the nearest 0 01-foot relative to mean sea level (MSL) <br /> Horizontal coordinates of the wells will be measured at the same time <br /> Exploratory boring logs and well construction details will be prepared for the final <br /> written report <br />