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• Mr Harlin Knoll Page 4 of 5 <br /> San Joaquin County Environmental Health Department <br /> July 12, 2005 <br /> of 0 020-inch machine-slotted well screen will be set from 40 feet to 45 feet bgs A Monterey No 3 <br /> silica sand filter pack will be installed from the bottom of the boring to 2-feet above the well screen <br /> A 3-foot bentonite seal will be placed above the sand pack and neat cement grout will be used to <br /> seal the remaining annular space to the surface Surface completion will consist of a traffic-rated, <br /> flush-mounted well box A locking well cap will be placed on the top of each casing The wells will <br /> be completed under the direction of a URS geologist and well completion details will be presented <br /> on boring logs <br /> MW-10S/MW--10D <br /> A dual-completion groundwater monitoring well set will be constructed in its respective borehole <br /> using 2-inch inside-diameter (ID), schedule 40, flush-threaded polyvinyl chloride {PVC} well <br /> casing Five feet of 0 020-inch machine-slotted well screen will be set from approximately 40 to 45 <br /> feet bgs A Monterey No 3 silica sand filter pack will be installed from the bottom of the boring to <br /> 2 feet above the deep well screen A 3-foot bentonite seal will be placed above the sand pack and <br /> neat cement will be used to seal the remaining annular space to one foot below the shallow well <br /> screen 15 feet of 0 020-inch machine-slotted well screen will be set from 5-feet above to 10-feet <br /> below first encountered groundwater, approximately 5 feet to 20 feet bgs A Monterey No 3 silica <br /> sand filter pack will be installed from one foot below to 2 feet above the shallow well screen A 2- <br /> foot bentonite seal will be placed above the sand pack and neat cement will be used to seal the <br /> remaining annular space to the surface Surface completion will consist of a traffic-rated, flush- <br /> mounted well box Locking well caps will be placed on the top of each casing The wells will be <br /> completed under the direction of a URS geologist and well completion details will be presented on <br /> boring logs <br /> Groundwater Monitoring Well Development, Sampling, and Surveying <br /> No less than 72 hours following installation,the groundwater monitoring wells will be developed by <br /> rigorously surging over the length of their respective screen intervals and by pumping <br /> approximately 10 casing volumes of water from each well The pH,temperature,conductivity,and <br /> turbidity of the development water will be measured and recorded periodically during the <br /> development process <br /> Groundwater samples will be collected from the groundwater monitoring wells no less than 48 <br /> hours after development The groundwater samples will be analyzed for GRO, BTEX, and fuel <br /> oxygenates by EPA Method 8260B The wells will be added to the quarterly groundwater <br /> monitoring schedule for the site <br /> K 1WprocessU5 BP ARCO\11194\2005 Well Install\11194 Well Install WP 05 doe <br />