"ayable with respect thereto. 9.1.2 Salaries of Contractor's employees when stationed at the field office, in whatever capacity employed. 9.1.3 Cost of contributions, assessments or taxes for such items as unemployment compensation and social security, insofar as such cost is based on wages, salaries, or other remuneration paid to employees of the Con tractor and included in the Cost of the Work un" . . . . .