Laserfiche WebLink
d) <br /> e) <br />~ f) <br /> <br />For a Sand Filter system, the following components shall meet the <br />specifications as described below:-, <br /> <br />MEDIUM SAND: is a mixture of clean sand with 100 percent passing the <br />3/8 inch sieve, 90 percent to 100 percent passing the No. 4 sieve, 62 <br />percent to 100 percent passing the No. 10 sieve, 45 percent to 82 <br />percent passing the No. 16 sieve, 25 percent to 55 percent passing the <br />No. 30 sieve, 5 percent to 20 percent passing the No. 50 sieve, 10 <br />percent or less passing the No. 60 sieve, and 4 percent or less passing <br />the No. 100 sieve. <br /> <br />FILTER FABRIC: is a synthetic sheet material permeable to water used to <br />prevent the movement of sand, silt and clay into the gravel. <br /> <br />1) Material, synthetic fabric, either spunbonded or woven. <br />2) Burst Strength, psi -- not less than 25 psi. <br />3) Air Permeability, cfm per sq. ft. -- not less than 500. <br />4) Water Flow 'Rate -- not less than 500gpm per sq. ft. at 3 in. head. <br />5) Surface Reaction to Water -- Hydrophilic. <br />6) Equivalent Opening Size -- 70 to 100 sieve. <br />7) Chemical Properties: <br /> a) Non-biodegradable. <br /> b) Resistant to acids and alkalies within a ph range of 4 to 10. <br /> c) Resistant to common solvents. <br /> <br />FLEXIBLE MEMBRkNE LINER: A synthetic sheet material of PVC (polyvinyl <br />chloride) sealed watertight used to impound and protect sand filter. <br /> Property Test Method <br /> <br />a) Thickness <br />b) Specific Gravity <br />c) Minimum Tensile Properties <br /> (each direction) <br /> A) Breaking Factor(ppi/width) 69 <br /> B) Elongation at Break (%) 300 <br /> C) Modulus (force) at 27 <br /> 100% Elongation (ppi/width) <br /> Tear Resistance (pounds min.) ASTM D1004, Die C 8 <br /> Low Temperture ASTM D1790 -20°F' <br /> Dimensional Stability AST~ D1204 +5 <br /> (each direction~ % change max.) 212-F. 15 min. -- <br />g) Water'Extraction <br />h) Volatile Loss <br />i) Resistance to Soil Burial <br /> (percent change minimum) <br /> A) Breaking Factor -5 <br /> B) Elongation at Break -20 <br /> C) Modulus at 100% Elongation +10 <br /> j) Bonded Seam Strength (ppi width)ASTM D3083 55.2 <br />k) Hydrostatic Resistance ASTM D751, Method A 82 <br /> <br />ASTM D1593,Para 8.1.3 <br />ASTM D792, Method A <br />ASTM D882 <br /> <br />Method A or B (1 in.) <br />Method A or B <br />Method A or B <br /> <br />ASTM D1239 <br />ASTM D1203, Method A <br />ASTM D3083 <br /> <br />30 mil. min. <br /> <br />-0.35% max. <br />0.7% max. <br /> <br />*ppi - pounds per inch <br /> <br /> <br />