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DDJC-Sharpe Groundwater Monitoring'Well Installation Work Plan <br /> Table 1-1. Estimated Well Specifications, MW526 Well Installation, DDJC-Sharpe* <br /> EstimatedCasing Casing Estimated Estimated <br /> W <br /> of <br /> Well Depth Diameter Material Screen Material Sizetot Length Well Se <br /> MW526A 45 ft bgs 4 inch SCH 40 PVC SCH 40 PVC 0.010 Scree <br /> 10 feet <br /> MW526B 75 ft bgs 4-inch SCH 40 PVC SCH 40 PVC 0.010 10 feet <br /> MW526C 140 ft bgs 4-inch SCH 40 PVC SCH 40 PVC 0.010 10 feet <br /> MW526D 230 ft bgs 4-inch SCH 80 PVC SCH 80 PVC 0.010 10 feet <br /> • Well specifications are dependent upon the Ethology encountered during drilling. <br /> ft bgs = below ground surface <br /> MW = monitoring well <br /> PVC = polyvinyl chloride <br /> SCH = Schedule <br /> 2.2 Field Documentation • Boring abandonment procedures(if <br /> 2.2.1 The URS field geologist will maintain an applicable); <br /> accurate log for all the borings.At a minimum, • Name of driller; <br /> the log shall include: <br /> • Name and signature of the field geologist <br /> • Name of the project and site; preparing the log;and <br /> • Boring number; • Name and signature of California registered <br /> • Dates drilled; geologist who provided oversight. <br /> 2.2,2 During the construction of each monitor- <br /> • Location of the boring; ing well,an as-built diagram of the well will be <br /> recorded by the field geologist.Furthermore, a <br /> • Type of drill rig; detailed log will be kept during the development <br /> of each well,The type of information that shall <br /> • Size and type of drilling method used; be included in each of these logs is discussed in <br /> the DDJC-SharpelTracy Comprehensive Field <br /> • Depth at which groundwater was first Work Plan(URS,2001b). <br /> encountered; <br /> • Depth to the static water level and changes 2.3 Drilling Requirements <br /> in static water level with hole depth; For the proposed A and B Zone monitoring <br /> wells,an 8-to 9-inch diameter boring will <br /> • Total depth of the hole; initially be drilled with 4-1/4-inch internal <br /> diameter hollow-stem augers to obtain a <br /> • Depth or location of any problems continuous core for lithologic logging. For the <br /> encountered(i.e.,heaving sands); C and D Zone monitoring wells, an 8-inch to <br /> 9-inch diameter boring will initially be drilled <br /> • Lithologies of soil layers encountered; using a mud rotary drilling rig to obtain a <br /> continuous core for lithologic logging. Mud <br /> • Reference elevation for all depth rotary drilling is preferable over hollow-stem <br /> measurements; auger drilling at depths exceeding 100 feet <br /> K'XWprocessV10363\sbarpeVAW 10stallation\MW526 WP.dm 3 September 2003 <br />