The general USCIS translation rule requires the full English translation and certification of completeness, accuracy and competence; it does not impose universal notarization. Check any separate requirement actually applicable to the evidence or process.
Identify the required service before buying extras
Obtain the real translation quote and distinguish optional services from required ones. Preparation charges should not automatically be counted as qualifying EB-5 capital, and a higher-priced certification does not guarantee approval. Ask the supplier to quote line by line and to name the requirement each line satisfies.
A certification of completeness, accuracy and competence is what the general rule calls for, and it is produced by the translator at no separate charge in many quotations. Notarisation authenticates a signature and answers a different question; it is sometimes required by a particular receiving authority and is otherwise an addition someone has chosen to buy. Hypothetical example: an entire bundle is notarised page by page on the assumption that more formality is safer, and the same money would have paid for the missing pages of two originals to be obtained at source.
Where a specific authority does impose a further requirement, confirm it against that authority's own current instructions rather than against a translator's standard practice. Preparation charges of any kind are professional expenses of assembling the case, and should not be presented as qualifying investment capital.