PA EQB Adopts New Stormwater Regulations under 25 Pa Code Chapter 102

Pennsylvania's Environmental Quality Board has adopted changes to 25 Pa. Code Chapter 102. The proposed regulations impose stringent post construction stormwater management requirements. One of the most significant requirements for the Post Construction Stormwater Management Plan (PCSMP) is a long term operation and maintenance plan which requires inspection and maintenance of PCSM BMPs in perpetuity. All PCSMP must be recorded in the Recorder of Deeds Office and will be a negative covenant which will "run with the land".

PCSMP are elevated to a level that their existence and maintenance will affect the "marketable title" to the real estate.

All parties responsible for long term operations and maintenance must be identified.

Additional items in the proposed regulations are as follows:

} 102.1 Definitions : ABACT = Antidegradation best available combination of technologies are required to manage the Rate, Volume and Quality of stormwater runoff

} 102.8 requires:

use of structural or nonstructural BMPs that prevent or minimize changes in stormwater runoff

PCSM BMPs will meet the volume reduction and water quality requirements in an applicable PADEP approved and current Act 167 watershed plan; or manage the net change for storms up to and including the 2yr/24 hour storm event when compared to the preconstruction runoff volume and quality; with the added criteria that sites with existing impervious surface, 20% of such existing impervious surface must be considered as if it were meadow in good condition

Sedimentation 101: Gravity Settling

Since 1901, the drinking water industry has relied on proven scientific principles for the removal of sediment particles from water. These scientific principles are based upon the known effects of gravitational force on the settling of sediment particles. There is a clear relationship between the amount of horizontal settling area (A) over which a flow of water (Q) is directed: the greater the A, the greater the amount of sediment removed from any Q.
The drinking water industry has been relying on the "inclined plate" technology to create the greatest amount of A within the smallest structure footprint to create the most efficient method for the removal of sediment particles from any given Q.
The Terre Kleen is the only stormwater hydrodynamic separator that uses the "inclined plate" technology to create the greatest A in smallest structure footprint.
Dr. Shirley Clark of Penn State University has conducted independent third party testing and analysis of the Terre Kleen's performance highlighting the efficiency of the inclined plate technology.
Terre Kleen has been certified for use by NJDEP at a loading rate of 18 gpm/sq ft of A. This certified loading rate results in the following loading rate for each structure footprint as follows:
TK 09: 33 gpm/sf of structure footprint
TK 18: 45 gpm/sf of structure footprint
TK 27: 52 gpm/sf of structure footprint
TK 36: 56 gpm/sf of structure footprint
TK 45: 59 gpm/sf of structure footprint
TK 54: 61 gpm/sf of structure footprint
TK 63: 63 gpm/sf of structure footprint

Terre Hill Stormwater Systems Enhances Low Impact Development

Low Impact Development seeks to maintain or restore a sites' natural hydrology, maintain natural resource protection while meeting the Clean Water Act environmental regulatory requirements.

Terre Kleen, a hydrodynamic separator that provides up to 176 gpm/sf of treatment flow rate, can be utilized as part of a treatment train site design to obtain a cost efficient pollutant removal result. The small footprint of the Terre Kleen minimizes conflict with the property's natural vegetation and, thus, is useful in helping maintain the natural site features. Terre Kleen is easy to maintain and the annual maintenance costs are less than 5% of the initial capital expense. This annual maintenance expense compares favorably with any stormwater BMP, including any "green" or LID BMP.

Terre Kleen Pretreatment Works

Terre Kleen removes pollutants from stormwater runoff. Terre Kleen primary chamber permanently removes gross pollutants such as oil, grease, trash, debris and sediment before these pollutants can enter and cause malfunction of an underground infiltration basin such as a Terre Arch system.

Picture shows the primary chamber of a Terre Kleen installed 12 months prior in a shopping center parking lot. If you do not design for pretreatment your BMPs will lose functionality and they will fail because they are clogged and choked up with stormwater runoff pollutants.

Don't risk a malfunction of your underground infiltration basin. Don't subject your LID BMP to gross pollutant and sediment overload.

Preserve the useful life and functionality of your stormwater LID BMPs.

Pretreat with Terre Kleen.

Terre Hill Stormwater Systems = Green Infrastructure and Smart Growth

Green Infrastructure is defined as: technologies that infiltrate, evapotranspire, capture and reuse stormwater to maintain or restore natural hydrology.
Terre Kleen is a stacked inclined plate hydrodynamic separator that pretreats stormwater by removing oil, grease, trash, debris, sediment, and nutrients and heavy metals that are attached to the sediment. The Terre Kleen does all of this in a very compact structure footprint. A key benefit of using a Terre Kleen in a LID BMP overall design is that the pretreatment of the stormwater runoff will remove the pollutants carried by the runoff before the stormwater enters the LID BMP. Oil, grease, trash, debris and sediment will not enter the LID BMP.
Terre Arch is a multi-arched precast concrete structure that is designed to maximize stormwater infiltration while facilitating use of the surface area above the Terre Arch. Terre Arch promotes Smart Growth by minimizing the land area required for development.