The old plant area of Xiangyang Changyuan Donggu Industrial Co., Ltd. (the investigation site) is located at No. 100, Diamond Avenue, Xiangzhou District, Xiangyang City, covering a total area of 92,852.4 m², of which the production area accounts for 51,725.4 m² and the reserved land area is 41,127 m² (used for greening before the relocation of the old plant area). The historical land use of the investigation site is as follows:
　　(1) Xiangyang Changyuan Donggu Industrial Co., Ltd. was established on December 9, 2001. In 2004, it acquired land at No. 100 Diamond Avenue, Xiangzhou District, Xiangyang City. Prior to construction, the old factory site was an empty lot and had not been contaminated. In December 2008, the company commenced construction of the “Technical Renovation Project for R&D Capabilities of Key Engine Components Above 3L,” which began operation in March 2010. Its main products include cylinder blocks, connecting rods, cylinder heads, bearing caps, gear cases, and other metal components. The production process primarily involves machining operations such as turning, milling, grinding, and boring, as well as welding; it does not involve surface treatment or painting processes.
　　(2) In 2010, in response to market demand, the company adjusted both the product range and production volumes under the earlier “Technical Upgrade for R&D Capabilities of Critical Engine Components Above 3L” project at the old plant. Some products were discontinued, while new products were introduced. Additionally, production processes were updated, and the original production lines were phased out. The facility primarily comprises 25 engine component production lines with a total annual capacity of approximately 2.5 million units/assemblies. Key manufacturing steps include rough milling, drilling, rough grinding, intermediate cleaning, finish milling, finish grinding, final cleaning, and inspection and testing. The process is relatively simple and does not involve additional surface treatments or painting.
　　(3) In October 2019, Xiangyang Changyuan Donggu Industrial Co., Ltd. relocated its old plant to a new site; the original site is currently being demolished, and the Xiangzhou District Government of Xiangyang City plans to reclaim the land use rights for subsequent development.
　　In December 2019, Wuhan Lianda Testing Technology Co., Ltd., entrusted by Xiangyang Changyuan Donggu Industrial Co., Ltd., conducted a preliminary investigation into the soil contamination status of the former old factory site located at No. 100, Diamond Avenue, Xiangzhou District, Xiangyang City. Based on the requirements of the “Technical Guidelines for Soil Pollution Status Investigation of Construction Land” (HJ 25.1-2019) and the “Soil Environmental Quality Standard for Risk Control of Soil Pollution on Construction Land (Trial)” (GB36600-2018), and in conjunction with the results of the preliminary investigation and on-site reconnaissance, the project team established a total of 8 soil monitoring locations within the site and collected 12 soil samples. The monitored parameters included all items listed in Table 1 of the “Soil Environmental Quality Standard for Risk Control of Soil Pollution on Construction Land (Trial)” (GB36600-2018) (VOCs, SVOCs, arsenic, cadmium, hexavalent chromium, copper, lead, mercury, nickel).
　　Based on the results of this soil monitoring: (1) For the 12 soil samples, the concentrations of all seven heavy metals tested (arsenic, cadmium, copper, lead, mercury, nickel, and hexavalent chromium) were below the screening values for Class I land use specified in the “Soil Environmental Quality — Risk Control Standard for Soil Pollution on Construction Land (Trial)” (GB 36600-2018). Furthermore, among the 39 VOCs and SVOCs analyzed in this study, none exceeded the screening values for Class I land use set forth in the same standard.
　　The preliminary investigation results of the soil contamination status at the old plant site of Xiangyang Changyuan Donggu Industrial Co., Ltd. show that all tested indicators in the soil samples from the site are below the screening values for Class I land use specified in the “Soil Environmental Quality Standard for Risk Control of Soil Contamination on Construction Land (Trial)” (GB36600-2018). Therefore, the site is not considered contaminated, meets the soil environmental quality requirements for its planned land use, and does not require detailed investigation or risk assessment; subsequent land development and construction can proceed.