T -- MEANDERLINE, NIKOLSKI, ALASKA

Notice Date

April 6, 2001

Contracting Office

Bureau of Land Management, 6881 Abbott Loop Rd., Anchorage, AK 99507

ZIP Code

99507

Solicitation Number

LAQ015025

Response Due

April 20, 2001

Point of Contact

Contact Sandee Smith 907-267-1326/Contracting Officer Mike Wilson 907-267-1312 Surveyor in Charge

E-Mail Address

Click here to contact the contracting officer or surveyor (s2smith@ak.blm.gov or m1wilson@ak.blm.gov)

Description

16 March, 2001 Request for Proposal for Meanderline Determination Nikolski, Alaska I. Introduction Within every parcel of land surveyed by the Bureau of Land Management (BLM), Division of Cadastral Survey, it is required to segregate all navigable and meanderable water in accordance with the 1973 Manual of Surveying Instructions (Manual). The Manual in secs. 3-120 and 121 specifies that . . . all rivers, the right-angle width of which is 3 chains and upwards, are meandered . . . and also states that all lakes of the area of 50 acres and upwards are meandered. The Manual also states that Tidewater streams are meandered at ordinary high tide as far as navigable, even when less than 3 chains wide. Meander line data has been collected and tabulated in the past through various methods: 1.) Conventional survey instruments *Requires total stations with electronic distance measuring equipment. *Every meander line point must be physically visited. *This method is not economical or practicable for the collection of large amounts of meander line data. 2.) Photogrammetry ("traditional") *Requires aerial photographs from an aircraft with surveyed and marked points on the ground to produce accurately controlled photographs used to interpret the meander line data. *More economical than conventional survey instruments for large projects, although it still requires expensive ground controlled survey points (panels) existing on the date of the photography. 3.) Global Positioning System (GPS) *Requires a physical occupation of each meander line point either on the ground or with a hovering helicopter. Requires excellent data management skills due to voluminous data *More economical than the above methods. 4.) Airborne GPS controlled Photogrammetry *This is relatively new and refined technology (within the last year or two.) *The camera itself is controlled with GPS requiring no traditional on-the-ground control points (panels) and no occupation of the meander line points. *With relatively large projects, this is the most economical method and lowest safety risk due to minimal helicopter flight time. II. Scope of Work 1.) It is anticipated that the "Airborne GPS controlled Photogrammetry" method will be used, using photogrammetric industry standards. Meander line point data of all meanderable water in the attached listing of townships shall be acquired and processed. The meander line shall be determined at the line of ordinary high water or mean high tide, in accordance with the Manual and any navigability determinations made by BLM prior to the award of this contract. The meander line data will be "weeded" to the extent necessary to show only the general sinuosities of the water bodies. Generally, no meanderlines will be less than 10 links or greater than 5 chains in length, and will generally have an average length of 1 to 3 chains. The final meander line bearings and distances between meander points will be rounded off to the nearest minute of bearing and the nearest link in distance. No meanderlines will extend across a protracted township boundary, but shall be a continuous polygon either unto itself or in conjunction with the particular protracted township boundary. The officially approved BLM protracted township boundaries to be used are available from the Anchorage BLM office. A BLM representative shall work with the contractor, within the Anchorage, Alaska commuting area, to determine which, to what extent, and to where on the water body, that it is meanderable. 2.) An easily accessible control point (typically in the immediate vicinity of an airport or community) within the project boundary or a point designated by a BLM representative shall be the basis of coordinates for the entire project. The BLM may identify additional (as many as an equivalent of 2 per township) control points through pre-paneling or existing photo identifiable points, for determination of a position (latitude and longitude) by the contractor as a quality control check. The BLM may also determine positions of representative sections of meanderlines and/or meander corners within each township as a further quality control check. 3.) Accuracy: The basis of coordinates shall be relative to a National Geodetic Survey (NGS) triangulation station, third order or better, in NAD27. Even if the NAD27 value has been superceded by NGS, the values shall be transformed to NAD27 using NADCON. Each final meander line point shall be accurate to within 1 meter relative to that point on the ground. Note: This accuracy is not normally obtainable with uncontrolled photographs. III. Schedule 1.) The aerial photographs used in the determination of the meanderlines should be taken as near as practicable to mean high tide/ ordinary high water. The aerial photography shall be flown prior to May 01, 2001. The purpose of this date is to allow the flexibility of the government to obtain the meanders non-photogrammetrically, because historically there is the possibility that weather in this area may prevent any aerial photography. The photographs will be taken when ice or snow shall not hinder the meander line interpretation process. 2.) The final deliverables (text file, AutoCad drawings, aerial photographs & negatives, GPS files, and flight line information) are required by August 1, 2001. IV. Deliverable The final deliverable product shall consist of: 1.) Two complete copies of computer disk(s) or compact disk(s) (C.D.), with a text file (.txt) of latitude and longitude in NAD27 (not a NADCON conversion) of each meander line point and any auxiliary control points, including the fixed station(s) used as the basis of coordinates. All points shall be labeled and correlated to an accompanying digital AutoCad v12, v13, or preferably v14 drawing of all the meanderlines and the aerial photograph(s). 2.) One complete set of aerial photographs and negatives, all raw GPS files for the base station(s) and aircraft, and a map labeled showing the flight lines and photograph positions. V. Bidders Submit a detailed proposal of the proposed methods, orders, procedures, and schedule. Award based on lowest price of qualified bidder. Nikolski Project Townships requiring Meander line determination: (18 total) T. 81 S., R. 133 W., Seward Meridian Tps. 82 S., Rs. 133 through 136, Seward Meridian Tps. 83 S., Rs. 134 through 137 W., Seward Meridian Tps. 84 S., Rs. 135 through 138 W., Seward Meridian Tps. 85 S., Rs. 138 through 140 W., Seward Meridian Tps. 86 S., Rs. 139 and 140 W., Seward Meridian

Record

Loren Data Corp. 20010410/TSOL004.HTM (W-096 SN50I5G7)