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GEOTECHNICAL PROFESSIONALS, INC.August 15,1997 <br />MJSE:A #97246 Page 4 <br />Electrically insulate underground iron pipe from dissimilar metals and above ground iron pipe with <br />insulated joints. <br />Copper Tube <br />No special precautions are necessary for bare copper tubing for cold water. Hot water tubing may <br />be subject to a higher corrosion rate. The best corrosion control measure would be to place the hot <br />copper tubing above ground. If buried, encase in plastic pipe to prevent soil contact or apply <br />cathodic protection. <br />Plastic and Vitrified Clay Pipe <br />No special precautions are required for plastic and vitrified clay piping placed underground from a <br />corrosion viewpoint. Protect any iron valves and fittings with a double polyethylene wrap per <br />AWWA C 105 or as described below for bare steel appurtenances. Where concrete thrust blocks are <br />to be placed against iron, use a single polyethylene wrap to prevent concrete/iron contact and to <br />eliminate the slipperiness of a double wrap. <br />All Pipe <br />On all pipe, coat bare steel appurtenances such as bolts, joint harnesses, or flexible couplings with a <br />coal tar or elastomer based mastic, coal tar epoxy, moldable sealant, wax tape, or equivalent after <br />assembly. <br />Where metallic pipelines penetrate concrete structures such as building floors or walls, use plastic <br />sleeves, rubber seals, or other dielectric material to prevent pipe contact with the concrete and <br />reinforcing steel. <br />Concrete <br />Protect all buried concrete from sulfate attack in soil with a severe sulfate exposure per UBC or <br />ACI-318. <br />Standard concrete cover over reinforcing steel may be used to protect the steel in concrete <br />structures and pipe in contact with these soils. <br />Piles <br />It is assumed that prestressed concrete piles will contain about 8 sacks of type 2 prestress cement <br />per cubic yard of concrete, a water/cement ratio not exceeding 0.45, and 2 inches of concrete cover. <br />No further corrosion control measures are required for such piles. I f ground water is present, solid <br />steel lifting lugs are recommended to prevent ground water from wicking into the pile interior. If <br />wire rope lifting lugs are used, they should be carefully drilled out 1.5 inches deep and the hole <br />filled with epoxy. <br />Please call i f you have any questions.