| All documents can be viewed with Adobe Reader, a free viewing program. The following Benchmark Information Table provides descriptions, elevation information and reference numbers for the recognized Benchmarks for the City of Rocklin.  | Important Information about Datums | | The City of Rocklin requires the use of the NGVD 29 Datum for vertical control. The alternate datums listed are for information purposes only and will not be accepted if used for vertical control purposes. |  Step 1. Locate the Benchmark you require on the Benchmark Map (8.1 MB) Step 2. Locate the Benchmark on the Benchmark Information Table (<1 MB) Step 3. Click on the Benchmark with the same reference number For Reference: Vertical Control Network Map (2.5 MB) |