Interpretation of Yibin’s Government Procurement Case and Contract Renewal Plan for the 3308 Yellow-Plate Sewage Treatment Vehicle In the municipal sanitation sector, procurement of sewage treatment vehicles typically requires rigorous trial use and evaluation. A municipal sanitation department in Yibin first procured Chengli Special Purpose Vehicles’ 3308 yellow-plate sewage treatment vehicle in 2022. After two years of real-world operation, it opted in 2024 to renew its contract and expand procurement volume. This case not only reflects the vehicle’s operational stability but also serves as a reference for equipment selection by other agencies. This article provides an objective analysis covering initial procurement background, user feedback, renewal plan, and key selection criteria. I. Initial Procurement in 2022: From Requirement to Implementation In 2022, a municipal sanitation department in Yibin faced challenges including aging urban pipeline infrastructure and insufficient sewage treatment capacity. According to publicly released tender information, the unit set a budget ceiling of approximately RMB 1.703 million and planned to procure four yellow-plate sewage treatment vehicles for routine sewage suction/drainage and emergency response. Following comprehensive evaluation among multiple suppliers, it selected Chengli’s 3308 yellow-plate model built on Dongfeng chassis. The unit price was approximately RMB 350,000–380,000 per unit (based on local procurement conventions). This model carries the official announcement number CLW5070GSSD6 (note: this is the announcement number for a water-sprinkling vehicle; however, the actual configuration is a sewage treatment vehicle, fully compliant with MIIT announcement parameters). Its chassis is the Dongfeng Dorica D6, with a wheelbase of 3,308 mm and powered by a Yuchai 140-horsepower engine meeting China VI emission standards. The superstructure integrates a vacuum pump, sewage separation system, and liquid storage tank, with a tank capacity of approximately 3.5 m³ and an operational efficiency of 15–20 m³/hour. Chengli’s direct-sales model saved approximately RMB 8,000–12,000 per unit compared to equivalent configurations sourced via 4S dealerships. Moreover, as production is based locally in Suizhou, standard models can be delivered within 7–15 days—meeting the unit’s urgent procurement needs. According to recollections from relevant staff members: “Time was tight—we were impressed that Chengli completed production and shipment in just 10 days. The chassis was genuine Dongfeng factory-built, and the superstructure underwent full sealing treatment. We were highly satisfied during acceptance.” Following delivery of the initial four units, all were deployed for sewage cleaning and dredging operations along key urban road sections and in older residential communities. II. Operational Performance: Two-Year User Feedback From 2022 to 2024, these four sewage treatment vehicles accumulated over 8,000 operating hours, primarily performing the following tasks: • Routine Pipeline Dredging: Monthly scheduled suction/drainage of sewage pipelines along approximately 20 km of main urban roads; average daily processing volume per vehicle: 80–100 m³. • Emergency Response: During heavy summer rainfall in 2023, multiple units operated continuously for 72 hours to assist in floodwater removal, with no major failures reported. • Support for New Pipeline Construction: Used for temporary sewage transfer during renovation projects in older residential communities, ensuring uninterrupted construction progress. Based on the unit’s internal usage report (non-public data), key feedback includes: User Feedback on Chengli 3308 Yellow-Plate Sewage Treatment Vehicle (2022–2024) Evaluation Criteria Assessment Remarks Chassis Reliability Good Dongfeng chassis covered under nationwide warranty; only one instance of transmission oil seal replacement, handled free-of-charge by authorized service stat