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precaution shall be taken to ensure placement without bridging of the materials as they are introduced into the well . 3 . 3 . 11 The CONTRACTOR shall be solely responsible for any defect in the cementing work and casing deformation due to improper, or lack of, equipment, technology, personnel or experience, either of CONTRACTOR or of any of his Specialty Subcontractors . CONTRACTOR shall pay all costs necessary to correct such defects . Should CONTRACTOR fail to correct defects , the ENGINEER may refuse to accept the well . 3 .4 Setting Time: 3 . 4. 1 No drilling operations shall be permitted until the grout has cured . 3 .4 . 2 Minimum setting time between stages shall be at least 12 hours . Longer time shall be necessary when high-yield cement is used. After cementing is completed on a casing, casing and well must remain undisturbed for at least 24 hours for setting of the cement . 3.5 Tag Depth : 3 . 5 . 1 The CONTRACTOR shall demonstrate the tag depths to the satisfaction of the ENGINEER and regulatory inspector prior to each grouting stage at all of the wells. The depth to the top of the existing grout or borehole shall be determined by washing out the annular space, if necessary, as approved by the ENGINEER and regulatory inspector. 4 .0 PAYMENT 4 . 1 Cement: 4. 1 . 1 The cost of cement and cement pumping shall be paid at the unit price per foot of cemented casing as stated in the CONTRACTOR ' s Bid Schedule. This shall include all necessary equipment, materials , and subcontracted services required to properly cement the casing as specified herein. 4. 1 .2 Payment for all work, materials, and equipment specified in this section , which are required to tag the top of each grout stage shall be included in the ubit price per foot of grouted casing as stated in the CONTRACTOR' s Bid Schedule . GROUT 02090 - 5 C\D0CUME— I \rrikeh\L0CALS— I1Tcrn ffcmporary Directory 17 for IRC wells Div I .zipM-IRC_Grout-OLD.doc 10/17/07