SIM stands for Subsurface Investigation Methodology. SIM is a standard operating procedure comprised of two specifications created specifically for subsurface investigations- one for underground utility locating and one for concrete scanning.
The comprehensive SIM specifications focus on a three-step approach aimed at achieving the most accurate results when performing non-destructive subsurface testing. The three critical factors that make up the specification are:
Subsurface investigations are used to determine the location of underground utilities and obstructions, as well as to find the locations of rebar, post-tension cables, voids, etc. within concrete. Investigations are critical before performing destructive operations such as trenching, boring, or drilling in order to avoid the high risk factor of hitting buried elements. Striking a utility can lead to worker injury or loss of life, equipment damage, outages, and costly project delays. Damage to structural elements in concrete can also can injury or death, damage to equipment as well as to the concrete itself, and costly delays.
“Call Before You Dig” services are a key place to start when performing subsurface investigations, but they do not cover private utilities. There is currently no industry-wide standard used in private utility locating and concrete scanning. The purpose of SIM is to establish an industry standard to act as a guide when performing such subsurface investigations. The use of SIM is expected to insure site safety, limit damage to subsurface and structural elements, and increase contractor accountability.
Note: GPRS does not provide geophysical, geological, land surveying or engineering services. If you need such services, please contact an appropriate professional.