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minutes - once every s minutes for the next: 2 ADDENDUM No. I once every 10 minutes for the next 50 to 100 0 to 50 rrinutea; minutes; and at 130, 160, 200, 250, 300, and each 100 minutes thereafter; or until static level has been attained. Upon completion of all work in connection with development and test l'ump'ing, the well shah_ be capped by welding a 1/4 inch steel_ plate over the top of the casing. T-6. 11 SANITARY SEAL If the bore diameter, for the conductor pipe is bigger than the diameter of the conductor pipe, a sanitary seal shall be constructed in accordance with "The Water well and Discharge Pipe Profile" shown on page 3 of the Blueprints. The concrete collar shall be to a minimum depth of the length of the conductor pipe. The sealing material shall consist of neat cerent, cement i grout or cement , these materials shall conform to San Joaquin County Standards . 7--8 . 12 PROCEDURE FOR DISINFECTING GRAVEL PACK I The recommended procedure shall be 50 pounds approximately of H.T.H. tablets added to gravel during placement or as required by the County. Tablets should be added to the gravel at a uniform rate of 2 tablets per cubiti foot. T--8 . 13 ANNULAR SEALS .An annular seal Jr cement grout shall be provided in •"'Onfor mance with San Joaquin County Standards . Palmynt shall be included in other items. Sealing or grout material shall ccnsist of a 2 : 1 ,sand: cGmsn:. mixture with 6 :gallons of Water Per sack of cement, with a naxinum cf 61 (percent) bentonite, or as required by the County. T-8 . 1. 4 CONCRETE BASE, SOUNDING TUBE, MISCELLANEOUS ITEMS Tn accori;.anes with the plans and as described below, the following items shall be furnished and installed by the Contractor. All itens shall COMply with San Joaquin County Standards . A three (3 ) inch galvanized standard weight steel pipe sounding tube stall be welded to the 24 inch conductor pipe and to the 12 inch well casing. The upper- end of, the pipe shall be threaded and provided with a 3" galvanized cad,, and a scXeened and inverted casing vent placed at :s ' miminun vertical distance from the slab surface. The opening should be placed in ' a vertical downward I position and covered with a fine wire nosh. The lower end should open into the 16 inch casing with the edges smoothed and rounded , off . Care shall rye used in this smoothing and rounding operatioll in order t O pr.c,ducs a c-ohnection with no sharp or angular edges .