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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 0 feet to 800 feet $20,70 per foot 800 feet to 1,200 feet $19.15 per foot (b) For portion of well In which 12-inch cas­ing is set $19.15 per foot . (c) For time spent by Contractor in develop­ing, testing and cleaning well, $1,336.00 for first 24-hour period plus $14,00 for each additional hour. (d) For additional labor to perform work as direoted by Engineer not covered by this contract for which "Order on Contractor" will be issued $12.00 per hour, (e) For welding circumferential seams of cas­ing from 0 feet to 200 feet $60.00 Section 6. Within a reasonable time after the comple­tion of the work to be performed under this contract and accept­ance by the Land Company, the Land Company agrees to pay Con­tractor, upon presentation of lnvoioe in triplicate ninety per cent (90$) of the compensation herein provided. The ten percent (10#) retained may be paid to Contractor by Land Company immedi­ately or at the option of the Land Company may be retained until the time allowed by law for the filing of liens upon or against said work shall have expired and until all liens filed upon or against the work shall have been fully discharged by the Con­tractor. Section 7. Contractor, in performing the covenants, 3.