[Ord. No. 777 §26-121, 3-23-1994]
The regulations and provisions contained in the Design Standards for Public Improvements are adopted for the following purposes:
To protect and provide for the public health, safety and general welfare of Billings.
To provide for adequate transportation and circulation throughout the City of Billings and to ensure the adequate provision of water, sewer and other public utilities and services.
To prevent the pollution of water resources, to protect from flooding and other dangers and to ensure the adequacy of drainage facilities.
To preserve and protect the value of land and buildings through minimizing land development conflicts and encouraging reasonable standards of subdivision design and the provision of public improvements.
[Ord. No. 777 §26-122, 3-23-1994]
All engineering drawings shall be of uniform size twenty-four (24) by thirty-six (36) inches and shall have a standard title block on the lower right-hand corner of the sheet. Consultants shall place their own title block above or to the left. The registration seal of the responsible engineer shall be placed in a convenient place in the lower right-hand corner of each sheet of plans.
Whenever possible, engineering plans and profiles shall be drawn to a standard sale of one (1) inch equals fifty (50) feet horizontal and one (1) inch equals five (5) feet vertical. Drainage area maps, construction details and cross section or contour maps shall be drawn o a suitable scale.
Elevations on profiles and sections or as indicated on plans shall be U.S.G.S. datum. At least two (2) permanent bench marks in the vicinity of each project shall be noted on the first (1st) drawing of each project and their location and elevation shall be clearly defined.
The top of each plan shall be either north or east and the standard north arrow should be used. The stationing on street plans and profiles may be either from the left to right or from right to left, but on drainage plans the stationing shall always begin at the low point.
When more than one (1) drawing is involved in one (1) project, an overlap of not less than one hundred (100) feet should be provided. Each project shall show at least fifty (50) feet of topography on each side. All existing topography and any proposed changes, including utilities, telephone installations and so forth, shall be shown on the plans and profile.
Revisions to drawings shall be indicated above the title block and shall show the nature of the revision and the date made.
Typical symbols to be used in the preparation for engineering drawings are contained in Section 400.1030. Topography for which symbols are not standardized shall be indicated and named on plans and profiles. In utilizing the standard symbols for engineering plans, all existing utilities, telephone installations, storm sewers, pavements, curbs, inlets and culverts and so forth shall be shown with a broken line; proposed facilities with a solid line; land, lot and property lines to be shown with a slightly lighter solid line. Easements shall be shown and, if known, the book and page number of the recording.
It shall be understood that the requirements outlined in these standards are only minimum requirements. When unusual subsoil or drainage conditions are suspected, an investigation should be made and a special design prepared in line with good engineering practice.
Each plan should indicate the owner or subdivider for whom improvements are to be constructed.
Lot lines and dimensions shall be shown where applicable.
[Ord. No. 777 §26-123, 3-23-1994]
Three (3) sets of the engineering construction plans for streets and storm sewers shall be submitted to the City Engineer. After approval by the City Engineer, one (1) set of the engineering plans will be retained by the contractor on the job site.
[Ord. No. 777 §26-124, 3-23-1994]
Periodic inspections shall be required during the construction of all public improvements. The developer shall schedule a preconstruction conference with his/her contractor, the City Engineer and the City Public Works Director to discuss project expectations and required inspections. The City Engineer shall witness acceptance testing of water and sewer mains. Required street improvement inspections shall be as set forth in Section 400.1190.
[Ord. No. 777 §26-125, 3-23-1994]