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k ' '1`-0 • n I NL:I'ALIA NG GRAVLI, ENVF..LOPE ADDENDUM NO. � The annular zing or space' between the casing string and the side wall of the reamed bore and/or conductor casing shall be filled with gravel. Volume of gravel placed shall be equivalent to the volume calculated on the basis of the caliper log. The gravel I pack shall be placed with a grout pump and tremie tube, from the bottom-up. When the a:isembled casing is centered in the bore, drill pipe with close fitting plungers shall be inserted into the casing while circulating a stream of clear water as the gravel is placed f in the annular space between the casing and bore hole. Swabbing and circulating shall, be continued during the operation of placing of the gravel . When the gravel is all placed, swabbing and circulating shall be f continued until there is no further settlement of the gravel and the gravel has been washed clean. Upon completion of this operation and renoval of the swab, all rock, sand and foreign materials shall be removed from the casing. T-8 . 7 PLUMBNESS AND ALIGNMENT 4 The contractor shall guarantee that the well when completed shall be sufficiently straight and plumb to permit the free installation and operation of a pump regularly built for 12 inch i casing. (See T-8 . 10) The well shall be drilled in such vertical alignment that a line drawn from the center of the well casing at surface to the center at the bottom of the well shall not deviate from the vertical more the E inches in 100 feet of length and that any ;ends shall not be claser to the inside wall of the casing than 5 inches. The cas- ).0 plumbness and alignjT,,ent shall be checked (as directed by the Engineer) by using either a 40 font well dummy or pi g. If the well casiF►g does not' allow unencumbered passage of the dummy or pig, then_ the contractor *will correct the problem to the SatlSfaction of, the Engineer . T-8.8 LOGS AIND RECORDS The contractor shall keep ars accurate daily log and record of all formations drilled through and the depths at which changes in the formations occurs together with such other information as may be called for by the Engineer_ Drilling log samples shall be sampled at intervals not to exceed 10 feet in depth and at each change in formation. . The Contractor shall submit :sampling procedure to Engineer and County for approval before the begin of drilling. Samples of the formation found in various strata shall be taken by the Contractor and preserved in receptacles to be furnished by the Contractor. The sa:npl.as sha? 1 be plainly marked with the well identification and shall show the depth below the ground surface fro;Tt which they were taken and the iIpprcximate thickness of the s:raturrj in w1)ic1, the sample was contained. The log of the wrell shall show all. materials penetrated with full descriptive notes .nac?e c,f all conditiol-is encountered while drilling. The log of the wee) 1. :_},aI ; the r.�etf'01, of c;oniPlF'tj ng the well, amount of material Fr,ovc:d duri r.e3 rIF J;�icpr.,�=nt and a) ! other pEart i tient data .