ARCHIVED REPORTS XR0001188 - Laserfiche WebLink

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promptly placed In iced storage for transport to the laboratory Chain-of-custody records were '16 initiated In the field by the geologist and accompanied the samples to a Iaboratory certified by the state of California to perform the analyses requested Monitoring Well Construction The monitoring well was constructed in the boring with thread-jointed, 4-Inch-inner-diameter, Schedule 40 polyvinyl chloride (PVC) casing No chelrucal cements, glues, or solvents were used In well construction The screened portion of the well consisted of factory perforated casing with 0 020-inch-wide slots The well screen extends from the total depth of the well to approximately 5 feet above the groundwater surface The annular space In the well was packed with number 3 sand to approximately 2 5 feet above the slotted interval A 3- to 5-foot-thick bentonite plug was added above the sand pack to prevent the cement from entering the Ezell pack The remaining annulus was backfilled to grade with neat cement or a bentonite cement grout See Appendix B for logs of exploratory borings The well was protected with a traffic-rated, cast-aluminum utility box equipped with a metal skirt The box has a watertight seal to protect against surface water infiltration The design of this box d.lscourages vandalism and reduces the possibility of accidental disturbance of the well Vapor Extraction Well Construction The vapor extraction wells was constructed in the boring with thread-bunted, 2-Inch-Inner-diameter, Schedule 40 PVC casing No chemical cements. glues, or solvents were used in well construction The screened portion of the well consisted of factory perforated casuig t with 0 020-inch-wide slots The annular space in the deep well was packed with number 3 sand to approximately 1 foot above the slotted interval A 3-foot-thick bentonite plug was added above the sand pack The remaining annulus was backfilled to grade with neat cement grout The dual completion well consisted of two 2-inch diameter PVC casings In a 8-foot-diameter borehole The casings were screened at two separate intervals to allow for a larger coverage area The annular space around the deep casing was then packed with number 3 sand to approximately 1 foot above the slotted interval Number 3 sand was placed on the bentonite seal to a depth of approximately 1 foot, and the shallow casing was placed on the sand The annular space around the shallow ' casing was then packed with number 3 sand to approximately 1 foot above the slotted interval A 3-foot-thick bentonite plug was added to prevent the cement grout from entering the well pack The remaining annulus was backfilled to grade with neat cement grout See Appendix B for well ' details sheets The well was protected with a traffic-rated, cast-aluminum utility box equipped with a metal skirt ' The box has a watertight seal to protect against surface water infiltration The design of this box discourages vandalism and reduces the possibility of accidental disturbance of the well SAC\N\P72\2613Q613IOW 1BB-95\1162 A-2 Rev 0 2!5197 22613-100 001