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ii ADDF?40UM NO. I The water uned f.or the drilling fluid shall be high quality drinking water to protect the aquifier from getting contaminated . The water from the existing water well is Manned from use for any :pork at the new well site. The contractor has to prove the Water quality to the Engineer and { County prior to dri.iling . T-8. 3 TYPE OF WELL DRILLING r The well shall. be drilled by the rotary hydraulic process wherein the wall of the drilled hole is held in place with a drilling fluid until washed out during the placement of the gravel or, at the option of the Contractor, by the reverse rotary drilling method. T--8.4 DRIMLING AND iNSTALLIN G CONDUCTOR CASING i The conductor casing shall be set in a reamed hole at least 30 t inches in diameter. The casing shall be securly anchored at the ground surface to prevent following. The conductor casing shall be firmly landed in an impermeable formation. It is specified L that the setting will be tc the approximate depth of 100 feet . All welding of conductor casing in the field shall be performed by welders qualified in accordance with the latest revision of section IX of the ASME Boiler Construction Code entitled "welding Procedures" , or by the American Weiding Society Standard Qualification Procedure. T-8. 5 DRILIING AND INSTALLING CASING The well casing shall be set in a -reamed }-sole (of at least 22" in the bore diameter) by approved neMhods in a manner that 4i1l insure no damage to t:►E casi ..ar during installation. Suitable guides or spacers (as approved by the Engineer or County) at nc greaten' than 60 feet on centers shall be provided, in order to center and hold the casing in its proper position until the grout and/or gravel pack is in place. The casing shall be suspended from ground surface and the bottom of the casing shall be at a sufficient distance above the bottom of the drilled hole to insure that none of the casing will be supported from the bottom. It is estimated that the setting will be to the approximate depths specified, however, the Engineer may order the setting to a greater or lesser depth if found advisable. f All welding of well. casing in the field shall be performed by welders qualified in accordance with the latest revision of Section IX of the A-SME Boiler Construction Code entitled "Welding Procedures", or by .he A,1arican Welding Soci e-.try Standard i Qualification Procedure . Al) joints of the a sing sections shall be joined by a c+7�ntir,uc.,us wel fillet , d with not less than 1/4 inch full