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<br />' and approved by the RESIDENT PROJECT REPRESENTATIVE. They may not <br />be acidic or toxic in nature. Soil materials and portland cement shall be <br />thoroughly blended by mechanical means prior to placement. This may be done <br />by machine or by hand. The entire length of the backfill, except for the last 3 <br />feet, shall be composed of soili;ement materials. The last 3 feet of backfill shall <br />consist entirely of rock. <br />4. The edit will be overfilled with rock a minimum of 3 feet to allow for future <br />t backfill subsidence. The maximum exposed backfill slope will be determined in <br />the field by the RESIDENT PROJECT REPRESENTATIVE, but will in no event <br />excced 1H;1.5 V. <br />' S. Gently compact backfill with excavation machinery (i.e., backhce bucket) as <br />directed by the RESIDENT PROJECT REPRESENTATIVE in order to seat <br />' rocks. <br />' H. Marking <br />1. Anew, 6-foot long, 3-inch I.D. (inside diameter), galvanized steel pipe shall be <br />' installed in front of each backfilled feature. The lower 2 feet of pipe shall be set <br />in concrete a minimum of 1-foot diameter and the upper 1-foot minimum, 2-foot <br />maximum, of the pipe shall extend above grade. Alternatively, a minimum 1-foot <br />' diameter, 3/8-inch thick galvanized steel plate may be welded perpendicular to <br />the bottom end of the pipe in lieu of the concrete anchor. A brass cap shall be <br />grouted into the upper end of the pipe by the Subcontractor using anon-shrink <br />grout or adhesive, such as Moly Parabond, Pour Rock, or Kwik Crete. The <br />Subcontractor may alternatively drill and grout a brass cap in undisturbed, <br />competent rock immediately adjacent to each backfilled feature. The brass caps <br />' will be supplied by the RESIDENT PROJECT REPRESENTATIVE. <br />3.6 BLASTING <br />' A. Description <br />' 1. This work shall consist of sealing openings through the use of controlled blasting <br />techniques in accordance with these specifications. <br />' B. Materials <br />1. A blasting plan must be submitted to the RESIDENT PROTECT <br />' REPRESENTATIVE a minimum of ten days prior to blasting. The blasting plan <br />shall consist of, but will not be limited to, the following: <br />a) The supplier and manufacturer of the explosives or blasting agents. <br />b) The type of explosive(s) or blasting agent(s) or any combinations proposed <br />for use, with proof of date of purchase. <br />' 6-14 <br />