Irrigation well project manual-1992

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h the tem ca to the ' and testing fa plumbr�ss and alignment, the Contractar shall attac porary p casing by two spot welds located 180-degrees from each other,unless directed otherwise by the , Owne�s Representative. The cost of temporary capping will be considered incidental to the work. 3.3.4 Testina for Pltunbness and Alianment ` Upon completion of the well construction,the Contractar shall demonstrate to the Ovmer that the � well is straight and vertical. The test shall be made in accordance with the methods established in current odition AWWA A100, Section 8. and Appendix C of the American Water Works Association Standard for Water Wells and witnessed by the Ovme,�s Representadve. � Should the well fail d�e plumbness or alignment requirements stated above,the Contractor shall comect such fault�or drill a new well and abandon the unsuccessful well at the Conuacto�s own � ezpense. No payment will be made fa well conswcdon, well develo�m►ent and grouting for wells not meeting the alignment and plumbness requirements. r hall be 'd for one lumbness and ali ent test made upon completion of the � The Conuacto s pai P 8� well. The Conhractor may make alignment tests at the Contractor's own expense at any time � d�ring construcaai of the well. The Owner reserves the right to require the Conuactor to make alignment tests at any time during construction of the well. If the well passes the alignment test the Owna will be responsible for the cost of the test. If the well fails an alignment test, the � Contractor shall bear all costs of all further alignment tests W vaify the adeqoacy of correcave work or the alignment tests of a new well drilled by the Contractor. 3.3.5 Well Develo�ment , The well shall be developefl to remove fines, stabilize the aquifer around the borehole, and � maximize tlu specific capacity of the well. Development shall be horizontal jetting and simnl�neous air-lift pumping(reference.F.G.Drisc;oll,Groundwater and Wells. 1986,pg.520). The outside diameux tt�e jeaing tool shall be 1.0 inch in diameter less than the inside diameter � of the scrxn. 'Ihe minimum exit velocity of the jet�ing fluid at the nozzle will be d�pendent on the drilling condidons encountered will be set by the Enginea; the Contractoc shall have equipment with d�e capability of 150 feet per second 'Il►e jetting procedure shall proce�d from , the bouom of the screen t�the tap. The jeuing tool shall be placed at one horizontal position, rotated at approximately one round per minute for at least one minute�and then raised to the nezt horizontal posioi�on which shall be no more than 6 inches above the preceding jeuing position. � During jetdng the well shall be pumped at a rat�e from 10 to 20 percent more than the volume of water introduced through the jetting t�ooL 'It�e boaom of the air line shall maintained just , above die jeuing t�ool. Development shall proceed until the well yields a sustained discharge of 40 gpm with a sand � content of 1 part per million or less. When the Conuactnr feels the discharge is acceptable,the Contractor shall notify the Engineer and shall perform a sand content test in the presence of the Engineer or Enginee�'s Representadve. The Contractor shall notify the Engineer at least 24 hours , in advance of when the sand content test will be perforn►ed. TS-3� � '