PA Stormwater BMP Manual Revision Committee Meets and Redefines Itself
As reported previously here, the PADEP-organized effort to revise its Stormwater BMP Manual (2006) re-convened for an almost day-long session at the South Central Regional Office in Harrisburg on 12/15/09.
The Manual Revision Committee met once in September and has resulted in the formation of 9 sub-groups. Each sub-group was assigned a specific substantive topic, and continued meeting during the Fall.
The appropriateness and transparency of this process has been questioned. As a result (and also for budgetary reasons), PADEP has reduced its direct sponsorship of the now all-volunteer Committee. To the extent that PADEP staff continue to participate, they do so on their own time.
The intent of the December 15 meeting was to summarize and review sub-group findings and determine future actions. Dr. Robert Traver from Villanova University had been asked by PADEP to chair the meeting, rather than PADEPs Domenic Rocco, the Committee’s initial organizer and coordinator. About 30 attended, including several staff from regional PADEP offices (PADEP Central Office staff have been directed not to participate; however, regional office are free to participate as they see appropriate).
Some major actions included:
1. Re-Constituting the Group: considerable time was spent in re-affirming the existence of the group and establishing an organizational structure
- including its separation from PADEP
- to be called a “stormwater technical work group”
2.. A mission statement was defined, expanding future work beyond Manual editing to include all related aspects of PADEPs stormwater management program
- its primary focus is to be “technical”
- but the group work also is likely to include aspects of policy (the group seems to feel that a technical focus invariably involves weighing in on policy issues such as recommended control guidelines or standards, as well as other important issues like Chapter 102 Revisions or the pending Draft MS4 General Permit and others)
3. Goals were defined
- Manual editing, both simple and complex
- possible comment on Chapter 102 Revisions and Draft MS4 General Permit program and others
4. Membership in the group was given some definition
- additional representatives can be added with submission of a resume, etc. provided that any/all focus on the “technical” work and agree to work cooperatively
5. Roberts Rules of Order will be used
6. The work group will have a board composed of the existing chairs of each of the 9 existing sub-groups; without establishing more complex by-laws, this board will meet and decide whatever needs to be decided
7. In terms of group outputs, “minority opinions” will be included when substantive disagreements emerge
8. No end or completion date was established.
Sub-group reports were given, mostly in verbal form but some with written attachments (to be included in the minutes of the meeting). Some highlights include:
Control Guidelines - Rob Traver stressed that CGs interrelate with so many of the other sub-groups. Thus far this sub-group is thinking that there…should be a collection of CGs rather than the more prescriptive Manual approach which is probably limiting use of LID at sites
Calculation Methods - The point was made that given the enormous shortcomings of rational, soil cover complex, and related methodologies, continuous flow modeling is likely to be the preferred way to go, though it is frustratingly data intensive and difficult to make happen across Pennsylvania’s 2550+ municipalities. Furthermore, this method isn’t compatible with event-based standards such as CG1 and its 2-yr storm. The methods are related to the standards that are being recommended!
Vegetated Systems - This sub-group is arguing for explicit Standards of Practice so that explicit engineering standards can be applied at sites.
Capture/Re-Use - This sub-group has substantially expanded the definition of this BMP from the current Manual.
Water Quality - This sub-group wants to establish water quality standards which transcend the current Manual, especially in light of new standards being promulgated for the Chesapeake Bay by EPA and others.
Infiltration - The major focus of this sub-group has been revising the appendices dealing with soil testing and site testing.
The Redevelopment and Highways and Maintenance sub-groups provided very condensed reports.
StormwaterPA will continue to report on this important effort in future weeks as it continues to evolve.


