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Nolte and Associates, Inc. • • MONITORING WELLS 1.08 DEVELOPMENT WATER During development and test pumping of the wells, development water shall be carried away from the well site in such a manner as to minimize erosion and avoid inundation of other construction activities. Contractor shall coordinate his activities with other contractors on the jobsite. 1.09 DISPOSAL Contractor shall make arrangements with the Owner for spreading of cuttings on site. PART 2 -PRODUCTS 2.01 GENERAL All materials shall be furnished by an established and experienced manufacturer or supplier. All materials shall be new, of first-class ingredients, and guaranteed to perform the service required. 2.02 MATERIALS A. Drilling Fluid Additives Direct rotary drilling fluid shall be made of high grade bentonite clays or organic polymer additives, in common usage in the municipal water well industry and meeting or exceeding American Petroleum Institute Standard 13-A, "Drilling Fluid Materials." Fluid shall possess such characteristics as required to condition the borehole walls and yet produce an easily removed thin filter cake. With submittal of the signed contract, Contractor shall submit a program prepared by a qualified mud engineer for approval by the Engineer. Submittal shall include recommendations for make-up water conditioning, quantities of clay base and additive required to obtain a drilling fluid with the following properties: mud weight 9.4 lbs/gal, Marsh funnel viscosity 45 sec/qt, API cake thickness 3/32 in., and sand content of return mud 2% by volume. Contractor shall maintain drilling fluid viscosity to raise cuttings and adequately _ condition walls of the holes. B. Well Casing and Screen The casing used in a well shall be flush couple threaded PVC (ASTM F480), Schedule 40, 4 in. nominal inside diameter (ID). No PVC solvent shall be used. If the well is artesian, a screw-on cap or valve will be installed on the well. End fittings provided with the pipe shall be double entry stub ACME flush screw threads with Viton O-ring male end fitting. The well screen shall be a continuous slot, wire wound design, or equivalent, with a slot width _l be determined after sieve analysis.-Each well screen shall be-20 ft long, or the top of the installed screen shall be 15 ft below thertground surface, whichever screen length is shorter All well screens and casings shall be kept clean and free of foreign matter, and washed with approved water prior to use. 3