Case Study and Bid Solution Analysis of the EHY5045TWCE6 Sewage Treatment Vehicle with 3,308 mm Wheelbase Procured by Yibin Municipal Government In 2024, a district Urban Management Bureau in Yibin City conducted a public tender to procure one sewage treatment vehicle with a 3,308 mm wheelbase (model: EHY5045TWCE6), with a budget cap of approximately RMB 435,000. Multiple special-purpose vehicle manufacturers participated; Chengli Special Purpose Vehicle Co., Ltd. (CLW) secured the contract and successfully delivered the unit, leveraging compliant technical specifications and localized after-sales service advantages. This article analyzes key clauses in the government procurement contract, delivery timelines, warranty period calculation methods, and how Chengli met the purchaser’s requirements during bidding. I. Project Background and Procurement Requirements This procurement was initiated by the district Urban Management Bureau, primarily for emergency sewage pipeline maintenance and septic tank cleaning in residential communities. The purchaser specified the following core technical requirements: chassis wheelbase of 3,308 mm (corresponding to Dongfeng DOLICA chassis), sewage tank capacity ≥ 4 m³, equipped with high-pressure cleaning pump and vacuum suction pump, and compliance with China VI emission standards. According to publicly released tender information, the budget was approximately RMB 435,000, and suppliers were required to provide complete official announcement parameters (referencing the parameter logic used for models such as CLW5070GSSD6 registered with the Ministry of Industry and Information Technology). Chengli Special Purpose Vehicle Co., Ltd. (located at No. 1 Chengli Avenue, Economic Development Zone, Suizhou City, Hubei Province) submitted the EHY5045TWCE6 model in its bid. The vehicle features a Dongfeng chassis with a 3,308 mm wheelbase and an in-house manufactured superstructure, fully compliant with China VI standards. Chengli committed to 'nationwide Dongfeng chassis warranty coverage' and 'lifetime service for the superstructure'. Ultimately, Chengli won the bid at a unit price of approximately RMB 365,000 (per publicly available tender data), representing a cost saving of RMB 9,150–17,200 compared to equivalent configurations offered through authorized 4S dealerships—demonstrating Chengli’s pricing advantage as a direct manufacturer. II. Interpretation of Essential Contract Clauses in Government Procurement In government procurement, contractual clauses are central to safeguarding the rights and obligations of both parties. Taking this Yibin project as an example, the contract includes the following key clauses: 1. Technical Specifications and Acceptance Criteria The contract explicitly requires the vehicle to comply with the 'Motor Vehicle Operational Safety Technical Conditions' (GB 7258) and the 'General Technical Requirements for Special-Purpose Vehicles' (QC/T 453), and mandates provision of the MIIT vehicle type approval certificate and environmental compliance documentation upon delivery. During bidding, Chengli had already submitted the official announcement parameters for the EHY5045TWCE6 model (following the same 108-parameter framework as CLW5070GSSD6), ensuring seamless registration and annual inspection. 2. Payment Terms and Warranty Retention Per local procurement practice, the contract stipulates: 30% advance payment upon contract signing; 65% payment upon successful acceptance and verification of the vehicle; and the remaining 5% retained as warranty deposit, payable within one month after expiration of the warranty period. Chengli accepted these terms and pledged 'transparent configuration—no bundled pricing', thereby eliminating potential post-contract cost escalations for the purchaser. 3. Breach of Contract Liability The contract specifies: if the supplier fails to deliver on schedule, liquidated damages of 0.1% per day of the contract value shall be deducted; if the vehi