A07 - CASQA Detail - TC-1 and TC-3.pdf
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- Solicitation number
- 36C78620B0015
About this file
This document contains technical specifications for best management practices related to construction site runoff. It provides guidance for stabilized construction entrances and exits (TC-1) and tire wash areas (TC-3) to help prevent sediment and mud from being tracked off construction sites by vehicles. For stabilized entrances and exits, it recommends using aggregate over geotextile fabric, with a minimum length of 12 times the diameter of the largest tire. Tire wash areas should be level if possible, constructed of coarse aggregate no smaller than 3 inches, and be able to support anticipated traffic loads. Proper implementation of these measures can help reduce sediment discharge from construction sites by containing soil and mud on construction vehicles to keep public roads clean.
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Stabilized Construction Entrance/Exit TC-1
July 2012 California Stormwater BMP Handbook 5 of 6 Construction www.casqa.org
50’ Typical
(1) Length should be extended to 12 times the diameter of the largest construction vehicle tire.
(2) On small sites length should be the maximum allowed by site.
Stabilized Construction Entrance/Exit TC-1
July 2012 California Stormwater BMP Handbook 6 of 6 Construction www.casqa.org
50’ Typical
(1) Length should be extended to 12 times the diameter of the la rgest construction vehicle tire.
(2) On small sites length should be the maximum a llowed by site.
Entrance/Outlet Tire Wash TC-3
January 2011 California Stormwater BMP Handbook 1 of 3
Construction www.casqa.org
Description and Purpose
A tire wash is an area located at stabilized construction access points to remove sediment from tires and under carriages and to prevent sediment from being transported onto public roadways.
Suitable Applications
Tire washes may be used on construction sites where dirt and mud tracking onto public roads by construction vehicles may occur.
Limitations
The tire wash requires a supply of wash water.
A turnout or doublewide exit is required to avoid having entering vehicles drive through the wash area.
Do not use where wet tire trucks leaving the site leave the road dangerously slick.
Implementation
Incorporate with a stabilized construction entrance/exit.
See TC-1, Stabilized Construction Entrance/Exit.
Construct on level ground when possible, on a pad of coarse aggregate greater than 3 in. but smaller than 6 in. A geotextile fabric should be placed below the aggregate.
Wash rack should be designed and constructed/manufactured for anticipated traffic loads.
Categories
EC Erosion Control
SE Sediment Control
TC Tracking Control
WE Wind Erosion Control
NS
Non-Stormwater Management Control
WM
Waste Management and Materials Pollution Control
Legend:
Primary Objective
Secondary Objective
Targeted Constituents
Sediment
Nutrients
Trash
Metals
Bacteria
Oil and Grease
Organics
Potential Alternatives
TC-1 Stabilized Construction Entrance/Exit
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