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N. Step I High-pressure, hot-water wash; Step 2 Scrub with soapy water(non-phosphate or lab-grade detergent); Step 3 High-pressure hot-water rinse, and; Step 4 Air dry. Rinsate from decontamination procedures will be collected and later transferred to a temporary holding container on-site for proper recycling/disposal. 3.1.2 Well Installation and Development The monitoring wells be constructed of 2-inch diameter polyvinyl chloride(PVC) blank casing with machine slotted PVC well screen. The final construction of each monitoring well (including depth and length of screened interval, slot and filter pack size) will be based on subsurface conditions encountered in the respective pilot boring. The monitoring wells will be constructed within the hollow stem augers. The filter pack will be .� emplaced in successive lifts by pouring the sand through the augers from the bottom of each boring to a depth of about 1-foot above the top of the well screen (4 feet bgs). The augers will be withdrawn as the filter pack is emplaced. A I-foot thick bentonite pellet seal will be installed above the sand pack to a depth of 3 feet b s. g An additional 2 feet of annular space will be grouted with neat cement. A steel well cover and locking cap will be set in the cement around the to of th monitoring wells. The well cover will be installed about I foot below p e valve box with a traffic-rated steel cover. grade in a precast concrete After installation has been completed, the wells wiII be developed using a bailer or a hand-operated Pump. During development, the specific electric conductance pit temperature an development water will be measured and monitored. WeII development will d clarity of the is relatively colorless and free ofsediment and the field we elopm i parameters proceed until the water Water generated during development and water sampling activities will be eters have stabilized. holding containers on-site for proper recycling/disposal. placed in temporary After monitoring well installation and development, the Iocation and elevation for surveyed by a land surveyor licensed by the State of California. each well will be 3.2 SAMPLING OF MONITORING WELLS Groundwater samples will be collected initially from the newly installed monitoringwells construction and development and on a quarterly basis thereafter. prior to saznpI eachf well Presence of free floating PHC product will be assessed using a clear Teflon® or acrylic bailer.h, the The PHILIP P. ROSS, R.G.