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2 03 GRAVEL FEED TUBE The permanent gravel feed tube shall be Type 304L, 4-inch diameter, stainless steel pipe conforming to ASTM A778 with a Schedule 40 wall thickness The pipe shall be furnished in 5, 10 and 20-foot lengths, measured shoulder to shoulder, with flush threaded end fittings Fit the top of the gravel feed tube with a suitable plug 2 04 SOUNDING TUBE The permanent sounding pipe shall be Type 304L, 4-inch diameter, stainless steel pipe conforming to ASTM A778 with a Schedule 40 wall thickness The pipe shall be furnished to 5, 10, and 20-foot lengths, measured shoulder to shoulder, with flush threaded end fittings Fit the top of the sounding pipe with a suitable plug 2 05 INJECTION LINES The permanent injection lines shall be Type 304L, 4-inch diameter, stainless steel pip conforming to ASTM A778 with a Schedule 40 wall thickness The pipe shall be furnished in 5, 10 and 20-foot lengths, measured shoulder to shoulder, with flush threaded end fittings Fit the top of the injection lines with suitable plugs 2 06 BULLNOSE The bottom of the casing string shall be closed with a 5/16-inch thick bullnose manufactured of the same material as the bottom section of casing and to which it shall be welded PART 3 - EXECUTION 3 01 GENERAL When the drilling and caliper survey have been completed, install the blank casing, gravel feed tube, sounding pipe, injection lines, and screen Do not float casing and screen into place to the borehole 3 02 INJECTION LINES Test the alignment of the injection lines during casing installation by lowering a dummy 1 that is 30-inches long and has a 3 7/8-inch outside diameter The injection lines' alignment shall be tested at intervals during casing installation of not more than 40-feet ' 3 03 JOINTS All 18-inch pipe joints shall be attached with collars secured by welding to accordance with these specifications All joints shall be watertight Welders shall be certified in accordance with AWS D10 9 for level AR-1 and shall be qualified in the 2G and 5G positions or the 6G position The 4-inch gravel feed tube, the 4-inch sounding pipe, and the 4-tnch injection lines shall be tack welded to the 18—inch casing's collars as shown to the Drawings 3 04 CENTRALIZERS Weld 4 steel guides positioned 90 degrees apart horizontally to the exterior of casing and screen at intervals of not more than 60 feet and at screen joints to centralize and hold the casing to the proper position until the gravel is in place Place the first set of August 2001 Division 111 -24 Ball Park& Park& Ride Wells Ph 1