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Hourly Rate §1.05 1.125 1.125 1.00 In event that the above ra tes are increased during the progress o f the work, or the Contractor is req u ired , in order to hold la b o r, to work in excess o f 8 hours per day, 5 days per week, thereby in creasin g the cost o f work performed hereunder, the Contractor s h a ll fu rn ish to the Owner an estim ate o f the extra c o s t, which i f s a tis fa c to r y to the Owner, s h a ll be added to the Guaranteed-i ' Maximum C ost. ( f ) S p ecial S ervice Fee.• Notwithstanding anything herein contained to the con trary, the Owner s h a ll pay to the Con­tr a c to r in a d d ition to the sum hereinabove provided, the fu rth er sum o f F ift e e n Thousand Four Hundred T h ir t y - fiv e and No/100 D ollars (§15,435.00), which said sum s h a ll be a s e rv ic e fe e and s h a ll include among other th in gs, (1 ) The C on tracto r’ s p r o f it . (2 ) S a la ries and expenses o f the execu tive o f f ic e s , Purchasing Department, A u ditin g Department, main o f f i c e accountants or main o f f i c e engineers o f the C ontractor, the cost o f keeping and main­ta in in g general books o f account in main o f f ic e in connection w ith sa id con struction work, any c le r ic a l and overhead expense o f the main o f f ic e o f the C ontractor, and a l l other expenses not d ir e c t ly chargeable to the work h erein provided f o r . 4. Terms o f Payment . On or b efore the f i f t h day o f each month, the Contractor s h a ll render to the Owner statement o f expenditures incurred in accordance w ith the p rovision s o f the Contract during the preceding 4' month. Such statements s h a ll be rendered in quadruplicate, and s h a ll be c e r t i f i e d by the C ontractor, and upon approval by the Engineer s h a ll be paid by the Owner w ith in f i f t e e n days a ft e r r e ­c e ip t o f such statement by the Owner; provided, however, that the t o t a l amount to be paid by the Owner s h a ll not exceed the said maximum cost as hereinabove set fo r th . I f , pursuant to the terms o f th is C ontract, the F ifte e n Thousand Four Hundred T h ir t y - fiv e and No/100 D ollars (§15,435,00), or any part th e re o f, as s p e c ifie d in sub-paragraph 3 ( f ) h e re o f, s h a ll "be due and payable, the Contractor s h a ll, upon the accept­ance o f the work by the Owner, render b i l l th e r e fo r , and upon Occupation Truck D river Tamper V ib ra tor Operator Watchman 5