加州圣迭戈县蒂华纳河土星大道管道延伸工程进入施工阶段：与圣迭戈市签约并招标，10月27日完成环境备案
加利福尼亚州圣迭戈县消息：圣迭戈县政府10月27日向加州环境质量法平台（CEQANet）备案《豁免通知》（备案号2026101047），就蒂华纳河谷（Tijuana River Valley）土星大道（Saturn Boulevard）管道延伸工程与圣迭戈市签订协议备忘录，并启动施工合同的招标与授予程序，这项旨在削减污水臭气的临时工程由此进入施工阶段。
文件显示，土星大道涵洞口受污染的水流湍急翻滚，不断泛起泡沫并释放以硫化氢为主的恶臭气体，是河谷地带公认的空气污染「热点」。工程将在现有涵洞上加装两根高密度聚乙烯（HDPE）延伸管，把水流导引至下游水面以下排放，以减少湍流与污染物雾化扩散，并在周边铺设抛石稳固河岸。
县政府在文件中表示，工程设计已经完成，并已取得加州海岸委员会的海岸开发许可；美国陆军工程兵团、区域水质控制委员会与加州鱼类及野生动物部的紧急许可将按应急工程程序办理。工程属临时措施，待未来永久性基础设施建成后，延伸管与抛石将被全部拆除。
今年6月24日，圣迭戈县监事会已全票批准从储备金中拨款250万美元建设这项管道延伸工程。蒂华纳河污水危机持续多年，帝国海滩（Imperial Beach）一带海滩反复关闭，周边居民长期投诉臭气与健康影响。
关联：圣迭戈县首任污染危机主管 Bridget Premont 上任 专责蒂华纳河污水危机
San Diego County, California Moves Saturn Boulevard Pipe Extension Toward Construction: City Agreement and Contract Filed October 27
San Diego County, California: The County of San Diego on October 27 filed a Notice of Exemption (SCH No. 2026101047) on the state's CEQA database for the Saturn Boulevard Pipe Extension Project in the Tijuana River Valley, adopting a memorandum of agreement with the City of San Diego and moving to advertise and award a construction contract for the short-term fix at the valley's best-known air-pollution hotspot.
According to the filing, contaminated, turbulent flows at the Saturn Boulevard culvert crossing churn up foam and release malodorous gas, primarily hydrogen sulfide, into the air. The project will install two durable high-density polyethylene (HDPE) pipe extensions on the existing culverts, discharging flows below the water surface downstream to reduce turbulence and aerosolization, with riprap placed for stability.
The county, serving as lead agency, says design is complete and a Coastal Development Permit has been secured from the California Coastal Commission; emergency permits from the U.S. Army Corps of Engineers, the Regional Water Quality Control Board and the California Department of Fish and Wildlife will follow emergency protocols. The pipes are temporary and will be removed once a permanent solution is built.
On June 24, the Board of Supervisors unanimously approved $2.5 million in reserve funds for the pipe extension. The Tijuana River sewage crisis has closed beaches around Imperial Beach for years and drawn persistent odor and health complaints from valley residents.
来源：GSM·美国（原文链接）
图片来源：图：蒂华纳河河口湿地与海岸航拍。NOAA摄，公共领域，来源：Wikimedia Commons / Photo: Aerial view of the Tijuana River estuary coastline. NOAA, public domain, via Wikimedia Commons
