HomeMy WebLinkAboutC407 - SWPP INFORMATIONGRAVITY BAG FILTER
Description:
A gravity bag filter, also referred to as a dewatering bag, is a square or rectangular bag made of
non-woven geotextile fabric that collects sand, silt, and fines.
Appropriate Applications:
Effective for the removal of sediments (gravel, sand, and silt). Some metals are removed with the
sediment.
Implementation:
Water is pumped into one side of the bag and seeps through the bottom and sides of the bag.
A secondary barrier, such as a rock filter bed and/or a straw bale barrier, is placed beneath and
beyond the edges of the bag to capture sediments that escape the bag.
Maintenance:
Inspection of the flow conditions, bag condition, bag capacity, and the secondary barrier is
required.
Replace the bag when it no longer filters sediment or passes water at a reasonable rate. The bag
is disposed of offsite.
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DE-WATERING AND PUMPING OPERATIONS
Description and Purpose
De-watering operations are practices that manage the discharge of pollutants when non-stormwater and
accumulated precipitation must be removed from a work location so that construction work may be accomplished.
Suitable Applications
These practices are implemented for discharges of non-storm water from construction sites. Non-stormwaters
include, but are not limited to, groundwater, water from cofferdams, water diversions, and waters used during
construction activities that must be removed from a work area. Practices identified in this section are also
appropriate for implementation when managing the removal of accumulated precipitation(stormwater) from
depressed areas at a construction site.
Limitations
Site conditions will dictate design and use of dewatering operations. The controls discussed in this best
management practice (BMP) address sediment only. The controls detailed in this BMP only allow for minimal
settling time for sediment particles. Use only when site conditions restrict the use of the other control methods.
Dewatering operations will require, and must comply with, applicable local permits.
Implementation
De-watering discharges must not cause erosion at the discharge point. A variety of methods can be used to treat
water during de-watering operations. This sheet provides options to achieve sediment removal. The size of
particles present in the sediment and Permit or receiving water limitations on sediment are key considerations for
selecting sediment treatment option(s); in some cases, the use of multiple devices may be appropriate.
C407
SWPP
INFORMATION
18095
Project Number:
Drawing Number:
Certified By:
Checked ByDrawn ByIssue Date
Revisions:PROJECT:Scope Drawings:CARMEL, INDIANANEWFORCARMEL CLAY SCHOOLSCARMEL ELEMENTARY SCHOOLSDrawing Title:
06-21-19 SO MK
Rev. #Revision
Description
Issue
Date
1 ADDENDUM 7/9/2019
3 ASI #1 8/28/2019
ELEMENT DESCRIPTION SHEET
INDEX
NARRATIVE
VICINITY MAP
IMPROVEMENTS C-403
HYDROLOGIC CODE C-406
STATE OR FEDERAL PERMITS IDEM RULE 5
STORM WATER DISCHARGE POINTS
WETLANDS, LAKES, AND WATER COURSES
RECEIVING WATERS SURVEY PG.'s 1&2, C-406
DISCHARGE TO GROUND WATER
FLOODPLAIN, FLOOD WAYS, & FLOODWAY FRINGE NONE
PEAK DISCHARGES
ADJACENT LAND USE
CONSTRUCTION LIMITS C-101-C-104
EXISTING VEGETATIVE COVER
SOILS
PROPOSED STORM WATER SYSTEMS
OFFSITE ACTIVITIES
SOIL BORROW OR STOCKPILES
EXISTING TOPOGRAPHY
FINAL TOPOGRAPHY C301-C304
POTENTIAL POLLUTANTS
SEQUENCE DESCRIBING STORMWATER QUALITY
CONSTRUCTION ENTRANCE
SEDIMENT CONTROL FOR SHEET FLOW
SEDIMENT CONTROL FOR CONCENTRATED FLOW
SEDIMENT CONTROL FOR SEWER INLET PROTECTION
RUNOFF CONTROL MEASURES
STORMWATER OUTLET PROTECTION
GRADE CONTROL STRUCTURE NONE
DETAILS FOR EACH STORM WATER QUALITY MEASURE
TEMPORARY STABILIZATION METHODS
PERMANENT STABILIZATION
MATERIAL HANDLING AND SPILL PREVENTION
MONITORING & MAINTENANCE GUIDELINES
EROSION & SEDIMENT FOR INDIVIDUAL LOTS N/A
POLLUTANTS & SOURCES ASSOCIATED WITH LAND USE
SEQUENCE FOR STORM WATER QUALITY MEASURES
POST CONSTRUCTION STORWATER QUALITY
DETAILS FOR EACH STORM WATER QUALITY MEASURE
DESC. MAINTENANCE FOR POST CONSTRUCTION SWQ MEASURES
SWPPP ELEMENT INDEX
C-406
C501-C504
C-401,C-402
C-401-C103 & C-406
C-404 - C405
C-401-C402
C-403
C-406
C-406
C-406
C-406
C-406
C-406
C-406
C504 & C403
C-100
C-406
PG. 3 OF SURVEY
PG. 1-2 OF SURVEY
C501-C504
PG. 1-2 OF SURVEY
C-401-C-403
C-406
C-406
C406-C603
C-406
C-402, C-403
C-401-C-403
C-401-C-403
C-401, C-402
PG. 1-2 OF SURVEY
C401-C402
2 TAC COMMENTS 8/12/2019
3
02/27/20