Horizontal Control Clause Samples
The Horizontal Control clause establishes the standards and procedures for determining and maintaining the horizontal alignment and elevation of construction work, such as roads, pipelines, or building foundations. It typically requires the contractor to use specified benchmarks, survey data, or reference points to ensure that all work is performed at the correct location and level. By clearly defining how horizontal measurements are to be controlled and verified, this clause helps prevent costly errors, misalignments, and disputes over the placement of constructed elements.
Horizontal Control. Section Corner and quarter section corner locations must be referenced to the ▇▇▇▇▇▇▇ County Horizontal Control Network. As part of the design survey all Section Corners and Quarter Section Corners within the project area and others used for project control must be located, reference and state plane coordinates determined with GPS equipment. The coordinates and referenced ties shall be shown on the plans and the standard corner reference report submitted to the Kansas State Historical Society, the County Engineer, and cities project engineer within 30 days of the survey as required by state law. If a ▇▇▇▇▇▇▇ County Horizontal Control marker may be damaged by construction the County public works department should be notified prior to the bid letting.
Horizontal Control. A-E shall recover horizontal control monuments sufficient in density to enable A-E to search for, and to re-set, if required, monuments required to re- establish any boundary lines. A-E may be required to recover vertical control monuments, and if required, this will be detailed for a specific project. The type, character, and number of any monuments set shall be approved in advance and in writing by County and all monument materials shall be furnished by A-E or as directed by County. Copies of all raw data files shall be submitted to County. The basis of bearing and coordinate control shall be as detailed for a specific project.
Horizontal Control. Section Corner and quarter section corner locations must be referenced to the ▇▇▇▇▇▇▇ County Horizontal Control Network. As part of the design survey all Section Corners and Quarter Section Corners within the project area and others used for project control must be located, reference and state plane coordinates determined with GPS equipment. The coordinates and referenced ties shall be shown on the plans and the standard corner reference report submitted to the Kansas State Historical Society, the County Engineer, and cities project engineer within 30 days of the survey as required by state law. If a ▇▇▇▇▇▇▇ County Horizontal Control marker may be damaged by construction the County public works department should be notified prior to the bid letting. Any ▇▇▇▇▇▇▇ County Benchmarks, ▇▇▇▇▇▇▇ County Horizontal Control monuments and any Section Corner and Quarter Section Corners within the area surveyed for the project must be conspicuously indicated on the plans. All bench marks and section and quarter section corners and property pins within the construction limits shall include a note for the re-establishment of the monuments.
Horizontal Control. Control shall be established along adjacent State Route and provide reference ties for control recovery. Horizontal control shall be constrained to the Missouri Department of Transportation Real-Time Network. Control shall be referenced to the North American Datum of 1983 (NAD83) (2011), Epoch 2010. Orthometric heights shall be referenced to the North American Vertical Datum of 1988 (NAVD88) using the current GEOID18 model. Control shall be referenced to the Missouri Coordinate System of 1983 in the west zone. Control point shall consist of 5/8” x 24” rebar with a 2” aluminum cap containing a defined datum point. 2D or 3D control point shall be placed a minimum 6 inches below the ground’s surface. If set in a cultivated field, the point shall be placed 12” below ground’s surface. Control shall be placed at the following locations and interval spacing:
Horizontal Control. Section Corner and quarter section corner locations must be referenced to the Johnson County Horizontal Control Network.
Horizontal Control. The complete surveys are to be referenced from established baselines/traverse, or tied to borough monument lines. Where no physical monument system exists, the Consultant shall research the survey record diagrams of local properties to identify fixed points on ground that have known dimensional ties to the legal Block and Lot lines that abut the project limits. Where no City coordinate system exists, the Consultant must perform the work in the required NY State Plane Coordinate system. Upon written authorization from the Commissioner, the Consultant may use an independent coordinate system. The baseline shall include a minimum of one permanent mark at the beginning, ending and angle base line points including one point at each street intersection. All marks shall be permanent such as; cuts in concrete, Monuments as required in undeveloped areas (Section 6), pre-existing borough monuments, masonry nails, re-bar or pipes with survey cap in grass area etc. All permanent marks (baseline/traverse control) shall be witnessed to three permanent structures in three separate quadrants, and measured to the nearest one hundredth of a foot (0.01’). The allowable minimum error (precision of closure) in the base line/traverse closure after angular adjustment shall be 1 in 20,000. Measurement methods, other than electronic Total Station, such as using GPS equipment is allowable, but must be pre-approved in writing by the Commissioner before work commences.
Horizontal Control. The Design-Builder must use the Project survey control coordinate system as the basis for all Project Work.
Horizontal Control. A-E shall recover horizontal control monuments sufficient in density to enable A-E to search for, and to re-set, if required, monuments required to re-establish any boundary lines. A-E may be required to recover vertical control monuments (if required, this will be detailed in the CTO for a specific project). The type, character, and number of any monuments set shall be approved in advance and in writing by COUNTY SURVEYOR and all monument materials shall be furnished by A-E or as directed by COUNTY SURVEYOR. Copies of all unadjusted field notes shall be submitted to COUNTY SURVEYOR. All material submitted shall be approved in writing by COUNTY SURVEYOR. The basis of bearing and coordinate control shall be as detailed in a specific CTO. DocuSign Envelope ID: 416E67DA-07D8-4514-8A5E-E2D2BDF7D4D8 In the case of Prado Dam Basin Property Acquisition Contract Task Orders, the basis of bearing and coordinate control shall be the California Coordinate System of 1927 (NAD 27), Zone 6, and the vertical control shall be based on the Orange County Surveyor 1976 adjustment, as previously established and available in a manual entitled “▇▇▇▇▇ Basin Horizontal and Vertical Control” available at the County Surveyor’s office. All found or set monuments shall be tied to the established control system as cited above.
Horizontal Control. Each horizontal control point shall be plotted on the map manuscript within the coordinate grid in which it should lie to an accuracy of 1/50 of an inch of its true position for the point. PLANIMETRIC FEATURES Ninety percent (90%) of all planimetric features, which are well defined on the photographs, shall be plotted so that their position on the manuscript shall be accurate to within at least 1/40 of an inch of their true coordinate position. None of the features shall be misplaced on the manuscript by more than 1/20 of an inch from their true coordinate position. Partially obscured planimetric details that may not meet this requirement will be shown by dashed lines where possible. Planimetric features totally obscured will not be shown. SUMMARY OF ACCURACY STANDARDS The following table specifies the level of E-TOPO® map accuracy (NMAS) to be expected for well defined (distinct) features as viewed in the stereomodel when ground control accuracy requirements are met as specified in Section 3.1.2. Horizontal Scale Feature Location Contour Interval Vertical (90%) Spot Elevations (90%) 1”=20’ 0.5’± 1’ ½ ft ¼ ft 1”=40’ 1.0’± 2’ 1 ft ½ ft 1”=50’ 1.25’± 2’ 1 ft ½ ft 1”=100’ 2.5’± 2’ 1 ft ½ ft 1”=100’ 2.5’± 5’ 2 ½ ft 1 ¼ ft 1”=200’ 5.0’± 2’ 1 ft ½ ft 1”=200’ 5.0’± 5’ 2 ½ ft 1 ¼ ft well defined (distinct) features as viewed in the stereomodel QUALITY CONTROL It is your responsibility and / or the subsequent users to perform field measurements and sufficient quality control (ground truthing) to determine suitability and acceptance of said mapping for its intended use, and assume all risk and liability in connection therewith. Eastern Topographics’ liability is hereby limited to warranty and accuracy of said mapping within the expense of flying, photography, and compilation. Any errors or omissions, as determined by field editing will be corrected by Eastern Topographics at no additional expense. Failure to notify Eastern Topographics within ninety (90) days from delivery of any errors and / or omissions shall be deemed an acceptance of the map and any claims as a result of such defect are waived. It is imperative that our mapping be field tested prior to any use of basemapping for design or construction.
Horizontal Control. After angular adjustment position closure ratio for closed traverse shall be a minimum of 1:20,000. Surveys shall achieve a spatial positional accuracy (95 percent Classification Confidence) of less than or equal to one tenth of a foot.