Are you sure your work on the project was not performed by someone else (by the general or some other subcontractor)? How and why was your scope deleted? The California Public Records Act can be used to obtain the contract documents and correspondence from the City. If your subcontract amount was in excess of one-half of one percent of the prime contract amount, you may have a remedy under the California Subletting and Subcontracting Fair Practices Act (Public Contracts Code section 4100-...
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There are a couple parts to this question. The first part concerns the non-payment for the work you performed. If you were terminated from the job without getting paid, you may have a right to file a mechanics lien against the property if you were a licensed contractor. If the amount owing was less than $5000, you could also pursue the homeowner in small claims court (or a civil court if more than $5000). As the injuries, it is unclear whether you had any sort of written agreement...