Work Item
ASTM WK30222

New Specification for Silica Test Sediments for the Evaluation of Stormwater Treatment Devices

1. Scope

The promotion of knowledge of the family of technologies known internationally as stormwater control measures (SCMs), including stimulation of research and the development of test methods, specifications, practices, guides, and nomenclature. SCMs provide for stormwater quality treatment, volume control, flow management, and runoff detention, retention, and capture and use.

This activity shall support and serve as a resource for other ASTM committees in their activities that include stormwater control measure issues. This support may include dissemination of specific requests for standards throughout ASTM's existing committee base, as well as the maintenance of appropriate liaison relationships (internal and external) related to this subject area. The committee will not duplicate the efforts of existing ASTM technical committees. The work of this committee will be coordinated with other ASTM committees and other organizations having mutual interest.

Keywords

particle size distribution; gradation; silica sand

Rationale

Agencies that regulate the use of stormwater treatment technologies frequently require laboratory testing of the devices using silica-based surrogate sediment. The objective of these studies is to test the sediment removal rate as a function of flow, particle size removal , particle resuspension, and washout. In some agencies, a standard manufactured silica sediment product is specified, whereas in other agencies, a custom particle size distribution (PSD) is specified and the testing organization is tasked with mixing commercially available materials to approximate the specified PSD. Recently, several manufactured silica sediment products, which have served as the standard contaminants specified by many agencies, have been discontinued. This change has occurred faster than regulatory agencies have been able to address the void. Subsequently, laboratories have been relying on rapidly diminishing stockpiles or attempting to recreate the products through sieving other products. In addition, prior research has shown that these standardized materials can have a significant variance in the PSD from published data. Manufactured for the purpose of foundry casting sand, the preciseness of the specification relative to the needed precision for testing in stormwater devices does not have a range of acceptable error. Since the use of these materials is for technology verification and these verifications are being conducted by different individuals, in different laboratories, using different lots or admixtures, standards are needed to ensure that devices are tested using material within the specification such that there is a level of confidence the same materials are being used.

The title and scope are in draft form and are under development within this ASTM Committee.

Details

Developed by Subcommittee: E64.01

Committee: E64

Staff Manager: Frank McConnell

Work Item Status

Date Initiated: 08-30-2010

Technical Contact: James Holtz

Item: 002

Ballot: C27.70 (19-01)

Status: Will Reballot Item

Item: 001

Ballot: C27.70 (20-02)

Status: Will Reballot Item

Item: 002

Ballot: C27.70 (20-01)

Status: Will Reballot Item

Item: 002

Ballot: C27.70 (20-03)

Status: Will Reballot Item

Item: 001

Ballot: C27.70 (20-04)

Status: Will Reballot Item

Item: 001

Ballot: C27.70 (20-06)

Status: Will Reballot Item

Item: 002

Ballot: E64 (21-03)

Status: Negative Votes Need Resolution

Item: 001

Ballot: E64 (21-02)

Status: Will Reballot Item