Subdivision, Site Planning and Construction Surveying
These items test the transition from record boundary to built environment: subdivision approval mechanics in Connecticut, lot and road design, and the stakeout computations that put lines and grades on the ground.
Subdivision and site planning
- Subdivisions are approved by the municipal planning commission, or combined planning and zoning commission, under Conn. Gen. Stat. Chapter 126; a subdivision generally divides a tract into three or more lots, and a resubdivision changes an approved map.
- Design numbers that appear on exams: minimum lot area and frontage, setbacks, right-of-way width, pavement width, sight distance, driveway grade and stormwater detention.
- Plats show bearings and distances, monument locations, areas, abutting owners and streets, dedicated rights-of-way, and the surveyor's seal and certification, plus a zoning compliance statement.
Construction layout
- Establish control or an offset line first, then stake from it. Curve deflection per station: δ = arc ÷ (2R) in radians.
- Cut or fill = existing elevation − design elevation; positive is cut.
- Slope staking solves for where the side slope meets natural ground; as-built surveys verify location and elevation before work is covered.
Worked example
At station 1+00.00 the design grade is 100.00 ft on a −2.0% tangent. At station 1+75.00, design elevation = 100.00 − 0.02 × 75 = 98.50 ft. Existing ground there reads 99.20 ft, so cut/fill = 99.20 − 98.50 = +0.70 ft, meaning 0.70 ft of cut. At station 2+00.00 the design elevation is 100.00 − 0.02 × 100 = 98.00 ft. The arithmetic is simple, but a reversed sign sends the excavator the wrong way.
Traps
- Reversing cut and fill signs.
- Staking record coordinates when construction control uses a different basis of bearings or a grid-to-ground factor.
- Confusing the right-of-way line with the pavement edge.
- Omitting monument locations or the zoning compliance note, which stalls plat approval.