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0 %22/99 18:1�1 M0.0-6 D17 <br /> 6 Piping system layout Trenching,bedding and backfilling <br /> Although fiberglass pipe has excellert strength,ft must be protected against impact <br /> which may Occur .a rm Improper hanc5ng or during backfiilirg. <br /> Prov7de a trend,width equal to Ire pipe diameter plus six inches on each side- <br /> Sepamte multipte:Ines by at lest 4 in&es-Refer to Fg.6-1. <br /> • provide a minimum of 18 inches of select bacldig between the top of the pipe and <br /> unpaved ground surfaces. <br /> • 'rovide a mimnitxn of 4 inches of select backfill between the top of the pipe and <br /> reinforced concrete pavement(4 inches minimum thicxness). <br /> • ?rovide a min,mum of 8 inches of select backfill between the top of*he pipe and <br /> asphalt pavement t2 inches rrunirnum thickness). <br /> • Slope the trench bottom evenly from the dispensers back to sumps or tanks at a <br /> minimum L6 irvft of slope. <br /> • The trench bottom must be free of herd or sharp objects_ <br /> • Grade the trerch bottom with at least 6 incites of select backfill to orovide firm, <br /> even suppo+`for the pipe.Compact the subgrade well to Prevent differential <br /> sertling. <br /> • Protect the pipe from impact d:xmg backfilling and abrasion during operation by <br /> surrcunding it with-cur to six inches of select backfill such as washed sand,pea <br /> gravel(Va-inch maoumum)or crushed stone{rf..-inch maximum). <br /> • Wrap pipe tying rear concrete with rubber or foam padding to avoid direct <br /> contact we the concrete. <br /> ------------I <br /> d(Hid— <br /> Fig.6-r.Use onlyserecrmaternelsfor <br /> bedding and back,fling L4.-46y 3WO/L hm! Select beckfiN <br /> nanddr-9 systemm fva&e materiels are rarely - <br /> suitable and should hat be used. f <br /> Sod a�,H ► 6(m nl <br /> Fig.S-2.Curing layout.'bonding and <br /> rnspecti+on•support the piping on <br /> 2X4 CAXC to keW thelolntS Cioari <br /> and to keep beddiaq <br /> aut of the pipe. j <br /> -JI <br /> 7 <br />