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2. MONITORING WELL INSTALLATIONS <br /> 1.2 Pre-Field Activities <br /> Prior to the start of field activities, the following will be performed. <br /> • Drilling permits will be obtained from San Joaquin County; <br /> • The site-specific health and safety plan (HASP) will be updated. The HASP will <br /> be available onsite during all field activities. Prior to the start of field activities, a <br /> safety tailgate meeting will be conducted; <br /> • The well locations will be marked on the ground with white spray paint or white <br /> stakes.Underground service alert(USA)will be contacted a minimum of 48 hours <br /> prior to commencement of drilling activities; and, <br /> • A geophysical subsurface utility locating company will be subcontracted (if <br /> necessary) in order to provide additional subsurface utility clearance for each <br /> boring. <br /> 1.3 Monitoring Well Installations <br /> Monitoring wells will be drilled and installed by a C-57 licensed drilling contractor. The <br /> wells will be drilled with the hollow stem auger drilling method'. The borings will be <br /> logged from the soil cuttings. The cuttings will be logged by field staff under the direction <br /> of a California Professional Geologist using the Unified Soil Classification System. All <br /> downhole equipment will be decontaminated prior to use. <br /> Once the target total depth is reached the monitoring wells will be constructed through <br /> the drilling casing. The monitoring well casings will consist of 2-inch nominal diameter, <br /> Schedule 40 polyvinyl chloride (PVC) pipe, with 0.010-inch factory-cut, slotted well <br /> screen, flush-threaded joints and a bottom cap. The outside boring diameter of the wells <br /> will be at least four inches greater than the outside diameter of the well casings. The <br /> annular space between the borehole wall and well screen will be filled with Lapis- <br /> Lustre 2/12 filter pack sand to a depth of about 2 feet above the top of the well <br /> screen. Approximately 2 to 3 feet of bentonite chips or pellets will be placed above the <br /> sand pack <br /> ' DTSC and RWQCB will be notified if an alternative drilling method is used. <br /> 2 <br />