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Tvpe of well of the down welt system components-and Well cap shall of sufficient strength to support the weight limit access to the well to avoid accidental contamination_ See Standard Specification Section 70,Well Pump and Accessory Equipment;Wellhead Cap Assembly, paragraph G.3. Pg 3. Size of erforations and rationale Well screen shall have Q_02-Inch machine-cut slots. The slot size is based on standard ASTM D 5092-Design and Installation of Groundwater Monitoring Wells.in Aquifers_ This slot size is typically used for monitoring well screens. I See Standard Specification Section 70, Well Screen, Paragraph B, P97 Grain size of sand pack and rationale g ack.and is based on standard ASTM 1 Gradation of sand conforms with Lapis Lustre Designation 2112 p D 509C-Design and Installation of Groundwater Monitoring.Wells.in Aquifers_ The gradation is typically used with 0.02-inch slot width screens. See Standard Specification Section 70, PRODUCTS, Sand Pack Paragraph C, pg Z Thickness and position of bentoriite seal and sand pack Sand pack shall extend from the bottom of well screen to 5 feet above top of screen. Bentonite seal should be 5 feet thick and placed above the sand pack See Specifications Figure 2, Singie-Screen Well Design_ De th ofwell: len and p0sitign of eorated intervaleetofwell screen should be Weil bottom shall be 15 feet below the groundwater table. Twenty installed at the bottom of borehole- SECTION oreholes SEC�Q WELL DEVELOPMENT Method of develo menttgbe used b attemating bailing with a close- Ai least24 hourafollo construction, r well e block.I be developed Afterthe sediment has been remove from the — — - - fitting bailer and surgingwith a vertedsur9 pumping with a decontaminated submersible bottom of the well casing, development will continue by emperature, and specific conductance pump_ The well developmentwill continue until the PH, ssible_ measurements have stabilized and the water is clear and coloriess,.if po Method of detenminino when development is completeof Stabilization shall be defined as agreement es h Pe cent of e last two �scale reminus reading for specific 0.1 pH units, plus orminus t_0'c and p or stabilized during the removal of three cased well volumes tai n ill be removed_ A record of the well development will be a maximum of five well volumes wmaintained conductivity_ if Parameters have not by using a well development log- Me og_ Method of development water disposal - Dispose of development water to ground surface near the monitoring well- -October=,2003 C,jnqw"monitoring Well Pian