SITE INFORMATION AND CORRESPONDENCE

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2.4 CEMENT AND BENTONITE GROUT Cement grout shall be a mixture of a maximum of 8 gallons of approved water per 94 lb bag of Portland cement,which conforms to ASTM C 150,Type H. Not more than 5 percent by weight of bentonite powder shall be added to reduce shrinkage and to hold the cement in suspension prior to the grout set. High-solids bentonite grout shall be made from sodium bentonite powder and/or granules. Water from an approved source shall be mixed with these powders or granules to form a thick bentonite slurry. The slurry shall consist of a mixture of bentonite and the manufacturer's recommended volume of water to achieve an optimal seal. The slurry shall contain at least 20 percent solids by weight and have a density of 9.4 lb per gallon of water or greater. 2.5 PROTECTIVE COVERS Monitoring wells shall have a steel lockable protective casing set over the well casing. The protective casing shall be set in concrete. Padlocks shall be provided by Tracy DD for the protective casing of the wells. The protective casing shall have a flush mounted protective utility vault over the protective casing(see figure 1). Any well that is to be left incomplete due to delay in construction shall be capped with a watertight cap and equipped with a vandal resistant cover. 2.6 PROTECTIVE POSTS Four 3 inch diameter, Schedule 40 carbon steel, 6 foot long, primed and painted yellow 1 protective posts shall be placed around the monitoring wells. 2.7 CONTAINERIZATION OF DEVELOPMENT WATER AND DRILL CUTTINGS Cuttings from the drilling operations shall be contained in D.O.T. approved drums as specified in 49 CFR 172. The Contractor shall furnish steel drums with lids, lid gaskets, and bolts. The drums shall be moved by the Contractor to a central location designated by the Corps of Engineers Representative. Water removed during development and testing operations shall be containerized and disposed of at the waste water treatment center,by the Contractor, on the base. PART 3 EXECUTION 3.1 PROTECTION OF EXISTING,CONDITIONS The Contractor shall maintain existing survey monuments and monitoring wells, and protect them from damage from equipment and vehicular traffic. Any items damaged by the Contractor shall be repaired by the Contractor at the Contractors expense. Monitoring wells requiring replacement due to Contractor negligence shall be re-installed according to these specifications. Wells scheduled for abandonment shall be protected from damage so that abandonment may be performed according to these specifications. 02671-004