Price Comparison Document for Topographic Survey of the Newly Constructed Brine Pipeline at Sote Saltworks

1. Price Comparison Criteria
Sote Salt Chemical plans to construct a new brine‑transport pipeline and has largely finalized the pipeline route. Surveying is now required for the terrain and landforms within 50 meters on either side of the pipeline centerline, including 1:500 topographic maps and 1:200 longitudinal profile drawings. The project owner is Chongqing Sote Salt Chemical Co., Ltd., with funding to be self‑financed. All conditions for competitive bidding are in place, and this topographic survey is hereby put out to open competitive quotation.
2. Project Overview
2.1 Project Location
Gaofeng Subdistrict—Shuanghekou Subdistrict—Longdu Subdistrict: Gaofeng Changyan Mine (buried pipeline installation)—Gaofeng Middle Road (buried pipeline installation)—Gaofeng Lingfeng Mountain (directional drilling crossing)—Mengzi East Road (buried pipeline installation)—Qinggangbang Interchange (pipe-jacking crossing)—Changqing Road (pipeline support installation/overbridge utility tunnel installation)—Sote Salt Chemicals Salt‑making Workshop.
2.2 Project Overview
Chongqing Sote Salt Chemical Co., Ltd. plans to construct a new Φ530 mm brine‑transport pipeline, which will be laid underground in a common trench. The pipeline will run from the Gaofeng Field rock‑salt mine in Gaofeng Subdistrict to the salt‑production workshop within Chongqing Sote Salt Chemical Co., Ltd. in Longdu Subdistrict. The entire route lies within Wanzhou District, Chongqing, passing through Gaofeng Town, Shuanghekou Subdistrict, and Longdu Subdistrict, with a total length of approximately 11.8 km.
In the non‑directional drilling crossing section, Φ530 mm steel‑reinforced polyethylene composite pipes are joined using specialized electrofusion fittings; they are installed either by underground burial, on pipe supports, or within a pipe rack (for the bridge‑spanning segment). In the directional drilling crossing section, straight‑seam submerged‑arc welded steel pipes are employed, with a high‑temperature‑resistant PE liner. The PE liner is bonded to the inner surface of the seamless pipe under high pressure, and flanged connections are used at both ends of the directional drilling crossing. The design pressure is 2.0 MPa.
2.3 Service Requirements
2.3.1 Mapping Scope
(1) The mapping width is 50 m on each side of the pipeline centerline.
(2) The surveyed length shall exceed the horizontal length, and topographic surveying shall be conducted within 50 m upstream and downstream of the pipeline route.
2.3.2 Mapping Scale
(1) Topographic map: scale 1:500.
(2) Longitudinal Profile: The horizontal scale of the pipeline centerline is 1:500, and the vertical scale is 1:200 (based on the ground‑line longitudinal profile determined in the later stage according to the finalized pipeline route).
2.3.3 Control Surveying
(1) For plane control surveying, GNSS static positioning, GNSS‑RTK, and total station traverse methods are recommended; the technical requirements shall comply with the provisions of the “Code for Surveying of Oil and Gas Pipeline Engineering” (GB/T 50539‑2017).
(2) Elevation control surveys shall employ GNSS‑derived elevation fitting, GNSS‑RTK surveying, and total station trigonometric leveling methods, with technical requirements in accordance with the provisions of the “Code for Surveying of Oil and Gas Pipeline Engineering” (GB/T 50539‑2017).
2.3.4 Topographic Surveying
(1) For topographic mapping, total station surveying and GNSS‑RTK surveying may be employed. When operating within the effective service area of network RTK technology, it is advisable to use this method; however, it must comply with the topographic surveying requirements specified in the “Code for Surveying of Oil and Gas Pipeline Engineering” (GB/T 50539‑2017).
(2) On topographic maps, the positional error of feature points relative to nearby control points shall not exceed 0.8 mm in general areas, 0.6 mm in urban building zones and industrial/mining areas, and 1.5 mm in water bodies; the elevation error of interpolated contour (or depth) line points or digital elevation model grid nodes relative to nearby control points shall not exceed 2 hd/3 (where hd is the basic contour interval in meters). For detailed coordinate points in industrial and mining areas, the positional and elevation errors shall not exceed 5 cm and 7 cm, respectively, for major structures, and 2 cm and 3 cm, respectively, for minor structures. The maximum spacing between adjacent feature points shall not exceed 50 m; elevation labels on topographic maps shall be accurate to 0.1 m.
(3) In addition to complying with standard mapping requirements, topographic maps shall also depict the alignment of the line at both ends, underground pipelines, transmission lines, navigational facilities, and other relevant features.
(4) Topographic maps shall undergo office-based verification, comprehensive field‑based cross‑checking, and field‑measured inspection. The volume of field‑measured inspections shall be no less than 10% of the total mapping workload, and the statistical results of these inspections shall comply with the requirements specified in (2).
2.3.5 Longitudinal Profile Measurement
(1) Longitudinal profile measurements may be conducted using total station mapping or GNSS‑RTK mapping to determine the coordinates and elevations of cross‑section points; technical requirements shall follow the provisions of the “Code for Surveying of Oil and Gas Pipeline Engineering” (GB/T 50539‑2017).
(2) Longitudinal profile measurements shall be conducted by collecting cross‑sectional data along the pipeline centerline, with both ends extended outward by 50 m each.
2.3.6 Measurement Results
(1) General Requirements
Providing digital topographic maps in the 2000 National Geodetic Coordinate System, with the 1985 National Vertical Datum.
(2) Instruction Manual
① Basis, requirements, and workload of the task;
② Geographical and topographical features along the route, as well as relevant information on local culture and transportation;
③ Standards and relevant instructions implemented in the course of work;
④ Elevation system, coordinate system;
⑤ Surveying procedures and related accuracy assessments (including the transformation parameters used in each session, the stakeout positions measured using these parameters, statistical tables of errors for known control points, and statistical tables of errors for the same stakeout position measured from different base stations);
⑥ Document the above- and below-ground structures within the survey area of the pipeline relocation section, and indicate the names of roads and high-voltage power lines. Where road bridges are present, measure and record the locations and dimensions of the bridge piers.
⑦ Measurement Control Point Results Table;
⑧ List of delivered drawings and documentation.
(3) Drawings
① Cross-sectional topographic map;
② Longitudinal cross-section of the crossing centerline.
2.4 Construction Period Requirements
Phase 1 (Cross‑sectional Topographic Map): Submit the surveying and mapping results of the cross‑sectional topographic map within 20 days after the contract is signed. Phase 2 (Longitudinal Profile of the Crossing Centerline): Conduct in coordination with the feasibility study preparation unit (or the construction design preparation unit) commissioned by Party A, and submit the longitudinal profile surveying and mapping results within 30 days.
2.5 Service and Quality Requirements
(1) Relevant laws, regulations, and national standards, including the “Code for Surveying of Oil and Gas Pipeline Engineering” (GB/T 50539-2017), the “Standard for Drawing in Petroleum and Natural Gas Engineering” (SY/T 0003-2019), and the “Standard for Engineering Surveying” (GB 50026-2020).
(2) The surveying and mapping results must meet the requirements of the detailed planning.
(3) If, due to localized adjustments to the pipeline route (with the adjusted length accounting for no more than 15% of the total), the surveying and mapping unit shall unconditionally cooperate with the owner to complete the subsequent surveying and mapping work.
3. Qualification Requirements for Bidders
3.1 Basic Qualification Requirements for Bidders
Bidders must be legal entities or other organizations duly registered within the territory of the People’s Republic of China.
3.2 Specific Qualification Requirements for the Project
Bidders must hold a Class-A surveying and mapping qualification certificate.
3.3 Performance Requirements
Within the past year, the applicant must have undertaken a 1:500 topographic mapping project covering an area of at least 1 square kilometer and provide a copy of the corresponding project contract.
3.4 Personnel Requirements:
3.4.1 Project Leader: Must hold the title of Senior Engineer in the field of surveying and mapping.
3.4.2 Technical Director: Must hold a sub-senior or higher professional title in surveying and mapping, as well as the qualification of a registered surveyor.
3.4.3 Quality Inspection Manager: Must hold an associate senior or higher-level engineering title in the surveying and mapping field and possess a registered surveyor professional qualification. (The candidate must provide proof of social insurance coverage for any month in 2026.)
3.5 This quotation does not accept consortium bids.
4. Quotation Deadline
Deadline: 14:00 (Beijing Time), October 30, 2026.
5. Contact Information
Price Comparator: Chongqing Sote Salt Chemical Co., Ltd.
Address: No. 98, Longxiang Avenue, Wanzhou District, Chongqing City
Contact: Peng Xingxiu Phone: 15923874799
6. Administrative Supervisory Authorities and Contact Information
This procurement activity is subject to oversight by the Discipline Inspection and Supervision Group (the supervisory authority) of the Xiangyu Salt Chemical Region. Contact information: Tel. 023-61002070, Postal Code 404001, Email xyyhjw@126.com.

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