All storm drain work must meet or exceed BWSC's standard requirements. BWSC reserves the right to determine whether drainage issues will be addressed during building renovations. 波士顿市的场地规划审查项目要求渗透的径流量等于1英寸降雨量乘以现场总不透水面积,必须在排放到雨水渠或少于100的项目的联合下水道系统之前渗透,000平方英尺的建筑面积. 所有在100或以上的项目,000平方英尺的建筑面积, 该项目必须使用等于1的径流量.25 inches of rainfall times the total impervious area on site.
雨水许可证规例
一般要求
链盆地
Chain basins are considered to be poor engineering practice. They are not allowed in the public or private way open to public travel. 如果连锁盆地要建在私有财产上, the last basin before the connection to the BWSC facilities must be a BWSC standard catch basin type with an oil trap outlet.
排水侧接
当街道上有单独的雨水渠时, 场地的雨水渠必须与雨水渠相连. 当街道上有一个联合下水道时, 场地的下水道和雨水排放基础设施必须在单独的管道中离开物业,然后在公共道路上通过管道连接到综合下水道.
连接细节
连接细节, if it is not being made to an existing wye branch on the drain, 必须在计划上显示吗. 与粘土的连接, 聚氯乙烯, 混凝土, 铁管将使用经批准的取芯机和机械装置或切割经批准的垫圈和鞍座来制造.
排水坡度
Minimum pitch is 1/8 inch per foot for building storm drain connections. Building connections shall be bedded in 3/4 inch minimum crushed stone to at least half the pipe diameter.
清洗
如果建筑物远离物业线,则需要对业主物业线处的建筑物雨水渠部分进行清理. A cleanout or access structure must also be provided on the downstream end of infiltration systems.
10英尺间距
The storm drain connections shall be laid at least 10 feet apart from any new or existing water services connections.
减少 & 帽
All abandonment of the existing storm drain services must be cut and capped off at the main(s) in the street. All such work must be performed by a Licensed Contractor.
检查
BWSC有权检查建筑物的卫生下水道, 建筑雨水渠, 以及其他私人下水道, 集油器, oil-particle分隔符, and other appurtenances tributary to the BWSC's wastewater and storm drainage systems. 检查 points must be delineated on the site plan, along with sign off by a BWSC inspector.
绿色基建/低影响发展(GI/LID)
For all re/construction projects in the City of Boston it is MANDATORY to retain stormwater on site. 对于少于100英尺的工程,在排入雨水渠或联合下水道系统之前,必须先渗入等于一英寸降雨量乘以现场总不透水面积的径流量,000平方英尺的建筑面积. 所有在100或以上的项目,000平方英尺的建筑面积, 该项目必须使用等于1的径流量.25 inches of rainfall times the total impervious area on site. BWSC will accept a 30% void ratio for volume within a stone area. 必须提供由注册专业工程师或注册卫生人员进行的土壤钻孔和/或测试坑,以确定现场土壤的渗透速度. A pre- and post- construction Drainage Analysis must be completed in accordance with the 马萨诸塞州雨水手册 (p. 68). Drainage calculations for the runoff are needed including the storm frequency, 浓缩时间, 最大径流量, and total volume of water for all projects involving over 2,500平方英尺的不透水表面. Information, including NOAA Atlas 14 precipitation frequency, can be found on the 降水频率数据服务器 网站. 渗透速率也将用于绿色基础设施/低影响发展(GI/LID)渗透实践的规模计算,以处理雨水径流.
为了满足查尔斯河的总最大日负荷(TMDL)和BWSC同意令中概述的水质要求,利用渗透的GI/LID实践是必要的. 有关GI/LID渗透措施的资料,可参阅BWSC的《365集团官网》和GI/LID标准详情,请参阅 马萨诸塞州雨水手册. Any project with an infiltration system and/or a catch basin addition must also include an Operations and 维护 (O&M)计划与他们的场地规划材料.
该计划必须确定:
- 雨水管理系统的业主
- The party or parties responsible for operations and maintenance
- 检查和维修计划
- 所需的维护任务列表
When directed by BWSC, the Applicant is required to electronically download BWSC's 绿色基础设施工作表,这是一个基于excel的模板. The Applicant must fill out the worksheet completely and upload it to BWSC by navigating to the landing page, 输入分配的项目编号, 上传工作表. 在项目完成时, the Applicant must upload an updated 绿色基础设施工作表 providing all as-built conditions.
地下注水井规范(UIC)
The Massachusetts Department of 环境al Protection (MassDEP) is now tracking all new infiltration systems, 目前称为地下注水井, 在马萨诸塞州. 土地规划审查申请人需要填写以下两种表格中的一种:2 - 4单元住宅的表格或所有其他类型房产的表格(单户住宅豁免,不需要表格). Applications must be submitted to MassDEP for approval. Once applications are approved, MassDEP will assign a UIC number. 然后申请人必须向BWSC提交UIC号码. Site plans will not receive BWSC approval prior to receiving a UIC number.
地下水涵养覆盖区
《365集团官网》第32条规定,在该市部分地区设立地下水保护覆盖区(GCOD),以保护建筑物的木桩基础免受地下水水位下降的破坏. 《365集团官网》的目的是确保建筑工程不会导致建筑工地或邻近地段的地下水位下降. 为GCOD内的场地规划审查项目设计的GI/LID不得利用地下排水渠或设计用于雨水收集和再利用. GCOD内的项目需要将雨水重新注入地下,以帮助将地下水水位提高到安全水平.
地下水覆盖区
渗透 & 减少流入协议书 & 理解
环境保护部(DEP), 马萨诸塞州水资源管理局(MWRA)及其成员社区实施了一种协调的方法来控制区域废水系统的流量, particularly the removal of extraneous clean water in the system. 2014年4月, the Massachusetts Department of 环境al Protection (MassDEP) promulgated new regulations regarding wastewater. BWSC拥有国家污染物排放消除系统(NPDES)许可证,其联合下水道溢流受这些法规314 CMR 12的约束.00,第12节.04(2)(d).
This section requires all new sewer connections with design flows exceeding 15,每增加一加仑的废水流量,就会减少4加仑的渗透和流入(I/I),从而减轻开发的影响. 在这方面, any new connection or expansion of an existing connection that exceeds 15,000加仑/天的污水应有助于减少污染/污染的努力,以确保额外的废水流量被污染/污染的去除所抵消. There is a minimum ratio of 4:1 for I/I removal to new wastewater flow added. BWSC supports the policy, and will require proponents to develop a consistent inflow reduction plan. 4:1的要求应在供水服务启动前至少90天确定,并将根据项目地盘平面图上提供的估计污水产生量.
New sewer connections that add estimated sewer flows greater than or equal to 15,000 gpd are required to remove a corresponding amount of 渗透/Inflow or submit a 4:1 渗透 & 减少流入遵守协议书 & 理解 stating the property owner's intention to pay a fee.
入流入渗减少计算
粒子分隔符
When outdoor parking and paved areas greater than or equal to 7,规划面积500平方英尺, 排放管道必须安装颗粒分离器. The type of separator used will depend on the drainage area served. 用于雨水渠分离器, discharge must be directed to the stormwater/combined system, 或者湿地,如果批准的话. The guidelines and 标准的细节 are provided by BWSC.
施工期间的雨水许可证
If construction site operations result in the disturbance of one acre or more of land, or are part of a planned disturbance of one acre or more, 必须获得美国环境保护署(EPA)的国家污染物排放消除系统(NPDES)和建筑一般许可证(CGP). 为了获得这些许可,开发商或业主需要准备一份防止雨水污染计划(SWPPP),并向环保署提交一份意向书(NOI). NOI可以通过电子方式提交给EPA.
Filing the NOI certifies that a SWPPP has been prepared and will be implemented prior to starting construction activities. SWPPPs must address the phosphorus TMDL for the Charles River. Information on preparing a SWPPP can be found on the EPA's 网站.
Site plans will not receive BWSC approval prior to receiving EPA NOI tracking numbers and SWPPP plans (in PDF format). 符合马萨诸塞州雨水政策的侵蚀和沉积物控制计划也必须提交给BWSC审查,然后才能批准现场计划.
地盘图则获批准后, developers are required to notify BWSC of the start date of construction activities. 根据雨水建设检查和执行计划,所有NPDES CGP站点将在施工开始后八周内由BWSC进行检查,并定期检查直到工作结束. 在施工期间,SWPPP运营商将遵守BWSC的施工现场检查和执行计划,维护他们的SWPPP,进行自己的检查并保存检查日志, 根据CGP的要求.
Weekly inspection reports are required to be emailed to BWSC at (电子邮件保护) 按月计算.
如发现不符合污水处理设施许可证的地盘,水务署或会采取执法措施,包括根据污水处理设施委员会有关使用卫生及综合污水渠及雨水渠的规例,发出停工令及罚款. Additionally, failure to obtain the NPDES CGP can result in EPA fines up $37,500.适用的建筑地盘每日收费00元.
排水许可证
A 排水许可证 application must be filed for certain discharges to BWSC's wastewater or storm drainage systems.
脱水排放许可证申请
了解更多有关脱水排放许可证的资料