Laserfiche WebLink
A <br /> ' Monitoring Well Installation <br /> Four monitoring wells will be installed using hollow-stem auger drilling methodologies <br /> (refer to Figure 5-1). Prior to beginning monitoring well installation, a utility clearance <br /> will be conducted at each well location. The utility clearance will include clearance of <br /> public property by USA, and clearance of private property using a private utility <br /> company. USA will be contacted a minimum of 48 hours prior to commencement of <br /> field activities. <br /> The monitoring wells will be installed under a SJCEHD permit. <br /> Mnitoring wells will be advanced using hollow-stem auger drilling techniques. The <br /> boreholes will be advanced using 8-inch-outer-diameter (O.D.) hollow-stem augers. Soil <br /> samples will be collected with a 1.5-foot California-Modified split-spoon sampler driven <br /> ahead of the lead auger. Samples will be collected at 5-foot intervals. Soil samples will <br /> not be collected for analytical purposes during this phase of the investigation. <br /> Boreholes will be advanced 5 feet into the groundwater and a 10-foot well screen will be <br /> ;ON set. Based on the CPT logs, the screen will be 0.020-inch mill-slotted. The remainder of <br /> the borehole will be cased with a Schedule 40 polyvinyl chloride (PVC) riser. During <br /> well construction, the well will remain suspended during the emplacement of the sand <br /> filter pack. Filter pack will consist of Lonestar 2/12 (or equivalent) and will be placed <br /> with a tremie pipe to approximately 2 feet above the screened interval. A 2-foot <br /> bentonite seal will be placed on top of the filter pack and hydrated. The annular space at <br /> the top of the well (grade) will be covered with plastic sheeting in order to prevent <br /> surface water runoff from entering the borehole. Following monitoring well installation <br /> the wells will be developed to remove fines. <br /> ,���,0Z_ �o(� <br />