The North American Industry Classification System (NAICS) code that best describes this requirement is 541611. The small business size standard is $6,000,000. In accordance with the Federal Acquisition Regulation (FAR) Clause 52.232-18, "Funds are not presently available for this contract. The Government’s obligation under this contract is contingent upon the availability of appropriated funds from which payment for contract purposes can be made. No legal liability on the part of the Government for any payment may arise until funds are made available to the Contracting Officer for this contract and until the Contractor receives notice of such availability, to be confirmed in writing by the Contracting Officer."