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June 24, 2003 -17- 003-2203.7 <br />I • The I-NSCS riser piping system consists of four vertical risers with 24-inch outside diameter (O.DJ <br />by 0.375-inch wall thickness carbon steel piping. Stainless steel Type 304 standazd flow shutter <br />screens with 0.25-inch slots, 10-foot minimum open screen section, 24-inch O.D. by 0.375-inch wall <br />manufactured by Roscoe Moss were installed as part of each vertical riser (IFC Drawing 23, <br />Detai[ 6). <br />Ames installed schedule 40 steel inlet pipe to connect the primary solution collection system piping to <br />the vertical risers (IFC Drawing 23, Detail 2). A 26-inch diameter DRl l HDPE perforated pipe was <br />used as an equalizer pipe to connect the primary solution collection pipes at the entrance to the PSSA <br />sump and to connect each riser. Ames installed approximately 35 linear feet of 26-inch diameter <br />DRl l HDPE perforated equalizer pipe. <br />Each FJVSCS riser foundation consists of a 10-foot by 10-foot by 1-inch steel base plate, a layer of <br />conveyor belting, 3-inch thick closed cell foam, Geocomposite Clay Liner (GCL), 100-mil smooth <br />LLDPE geomembrane, and 12 ounce per yard non-woven geotextile. Ames installed approximately <br />400 square feet of each of these components. <br />Ames installed approximately 1,9611inear feet of 4-inch diameter PCPE Tertiary HVSCS pipe; <br />441 lineaz feet of 8-inch diameter, 4101inear feet of 10-inch diameter, 280 linear feet of 12-inch <br />diameter, and 1,129 linear feet of 15-inch diameter PCPE Secondary HVSCS pipe; and 3,491 linear <br />feet of 26-inch diameter perforated DRl l I-IDPE Primary HVSCS Pipe. <br />Ames began installing the PCPE HVSCS pipes in May 2003, and completed in June 2003. Pipe <br />locations are shown on Record Drawing No. 8 in Appendix A. Pipe sections were connected to each <br />other using couplings. Laborers haunched pipes with DCF and kept pipes in place during DCF <br />placement. <br />A network of 4-inch Tertiary FIVSCS pipes were installed at approximately 100 feet on-center at a <br />minimum 2 percent grade, draining to the larger Secondary PCPE HVSCS pipes. Four-inch Tertiary <br />HVSCS pipe sections were connected to each other using couplings, and were attached to the <br />Secondary HVSCS pipe using ties. Laborers haunched pipes with DCF and kept pipes in place <br />during DCF placement. <br />• <br />xnoo~zxos~aomFmc~~ess~osomooxzzoa.oaoo.o~wrs.o.a« Golder Associates <br />