WORK PLANS - Laserfiche WebLink

Home Browse Search

DDJC-Sharpe Groundwater Mo*g Well Installation Wc rk Plan depths exceeding 100 feet below ground surface 4.0 WELL MATERIALS (bgs)due to the potential for heaving sands and the difficulty in controlling these sands using 4.1 Well Casing augers.The mud rotary borehole will also contain a multiple completion well,with the C The well casing will be 2-or 4-inch nomil lal and D Zone wells constructed using 4-inch- diameter Schedule 40/80 PVC pipe with f ush diameter PVC casing(see Section 5.2 of the threads for the monitoring wells.The casi ig DDJC-Sharpe/Tracy Comprehensive Field surface will be free of solvents,oils,grea e, Work Plan Field Procedures [URS,2004a] for paint, and dirt and will be certified clean I torn details regarding construction of multiple the factory or steam-cleaned on site prior o completion wells).Upon completion of drilling installation. Sections of casing will be rec ived and logging,the two borings will be reamed from the supplier wrapped in polyethylen using their respective drilling method to at least protective wrappers with sealed ends in oi der to 10 inches for the installation of the 2-and 4- limit exposure to potential contaminants. Casing inch-diameter monitoring wells in sandy zones will not be removed from the wrapping in til in the A,B,C, and D aquifer zone intervals. immediately before it is to be placed in th Additional detail regarding the hollow-stem boring. auger method of drilling and mud rotary method of drilling is included in the DDJC-Sharpe/ 4.2 Well Screen Tracy Comprehensive Field Work Plan Field Procedures(URS,2004a). The well screen will be 2-or 4-inch no al diameter,Schedule 40/80 PVC with flush 3.0 WELL SPECIFICATIONS threads for all the monitoring wells(shallow wells will have 2-inch-diameter casing). l The monitoring wells will be installed using screen openings will widen inward so as to be guidelines set forth in the DDJC-Sharpe/Tracy nonclogging. The slot size will be compatible Comprehensive Field Work Plan Field with the filter pack that will surround the Procedures(URS,2004a).The well design screen; slot size and filter pack will be de -r- specifications of the proposed monitoring wells mined based on pilot boring lithologies.The are provided in Table 1-1. The total depths and well screen will be of sufficient size and screen lengths for MW526A,MW526B, designed to hold back and support the felt r pack MW526C,and MW526D are estimated based and in situ soils surrounding the screen. T ie on the total depths and screen lengths of nearby well screen surface will be free of solvent;,oils, monitoring wells in the A,B,C,and D Zones, grease,paint,and dirt and will be certifte clean respectively (Radian Corporation, 1996b). from the factory or steam-cleaned on site nor Attachment A contains boring logs for nearby to installation.The well screen will have monitoring wells MW522A,MW522B, smooth, sharp-edged openings free of bur.7s, MW522C,and MW527D. A diagram of a chipped edges,or broken pieces on the ini erior typical groundwater monitoring well multiple and exterior surfaces of the pipe. Section of the completion design is shown on Figure 1-2 screen will be received from the supplier (Figure 1-2 is taken from the DDJC-Sharpe/ wrapped in polyethylene protective wrapj ers Tracy Comprehensive Field Work Plan Field with sealed ends in order to limit exposum to Procedures [URS, 2004a];specifications shown potential contaminants.Wrapping will no be are not necessarily indicative of those described removed until screen is to be used. in this work plan,e.g.,number of wells,casing diameters,and surface completion design). 4.3 Filter Peck The filter pack material will be composed of round,hard, water-worn siliceous sand,fiee of flat or elongated pieces,organic matter,or other K\WprmmsU10363\sharpe\MW Insta11at1on\F1NAL\MW526.dw 5 June 2004