Unit-price maintenance contracts live or die on documentation: daily production records, asset-level identification, measured quantities, before/after photographs, and invoices that reconcile exactly against verified quantities.
On our Hawaiʻi DOT traffic-sign cleaning and vegetation assignment, hundreds of signs across multiple Hawaiʻi Island highways were cleaned and documented, categorized by measured surface area, with daily production tracking supporting quantity verification and government invoicing.
The practical recipe: assign every asset an identifier and location; measure the billable dimension; photograph before and after; log daily production against the contract schedule; and reconcile invoices to the log, not to memory. Agencies get auditability; contractors get paid without disputes.
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This article is general information, not engineering, legal, or safety advice for any specific project. Site-specific conclusions require assessment by qualified — and where required, licensed — professionals.