| The following
credit calculation requirements apply:
- The calculations must demonstrate how
the pollutant reductions will be achieved from the proposed pollutant
reduction activity to generate credits for the applicable period of
time.
- The pollutant reductions must be expressed
in pounds per year.
- The calculations used must be based on
methodologies that the Department determines are appropriate under 25
Pa. Code § 96.8(c).
- The calculation must include a 10% set
aside for the Department's credit reserve.
Non-Point Calculation Spreadsheet
To assist with the calculation of pollutant
reductions that could be generated through the implementation of Best
Management Practices (BMPs), calculation spreadsheets have been developed.
These spreadsheets were developed by World Resources Institute (WRI),
Pennsylvania Environmental Council (PEC) and the Department along with
input from the Chesapeake Bay Tributary Strategy Steering Committee
Agricultural workgroup and others in 2006-2007.
Note: These spreadsheets may be updated
and corrected as needed, so please check this website prior to submitting
a request for certification to ensure that you use the most up-to date
version. At this time, these spreadsheets should not be used to calculate
reductions generated from the carbon sequestration BMP and the water
control structure BMP.
N
Spreadsheet (Excel)
P Spreadsheet (Excel)
Should you have questions related to the
spreadsheets or how to calculate reductions from a practice that is
currently not included, please contact the Department’s Water
Planning Office.
Point Source Load Calculations
Starting in 2012, DEP will not
accept requests for certification and verification of credits unless
the concentrations and loads are documented on DEP’s Excel-based
“Nutrient Monitoring” (3800-FM-BPNPSM0444), “Monthly
Nitrogen Budget” (3800-FM-BPNPSM0445) and “Monthly Phosphorus
Budget” (3800-FM-BPNPSM0446) forms. These Excel
forms are available on DEP’s website (all forms contained
in one spreadsheet file). The forms should be sent electronically to
DEP when submissions for certification and verification are made.
When calculating concentrations and loads
for total nitrogen, please remember the following:
The concentration of Total Nitrogen (TN)
in a sample is determined by the sum of concentration results for Nitrite-Nitrogen
(NO2-N), Nitrate-Nitrogen (NO3-N) and Total Kjeldahl Nitrogen (TKN)
(measured in the same sample). Where one of the components of TN has
a result of non-detect, ignore the less than (<) symbol for the calculation,
but include it in statistical results. It is noted that for the purpose
of certifying and verifying TN credits under PA’s Nutrient Trading
Program (see 25 Pa. Code 96.8), credits will be calculated using the
difference between actual performance (i.e., DMR data) and permit limitations,
where the less than (<) symbol for Total Monthly loads is ignored.
Below is an example of how statistics
should be calculated where there are non-detect results in the data
set:
Example – A permit requires
that two samples be collected per month for TN. The permit requires
that the Total Monthly load be reported on the DMR. Sample 1 is collected
on a day in June in which the average flow is 0.5 MGD. Sample 1 is analyzed
and the following results are obtained: NO2-N + NO3-N = < 1.0 mg/l,
TKN = 10 mg/l. Sample 2 is collected on a different day in June in which
the average flow is 0.6 MGD. Sample 2 is analyzed and the following
results are obtained: NO2-N + NO3-N = 2.0 mg/l, TKN = < 5.0 mg/l.
The relevant statistical values for TN
are as follows:
Sample 1 Concentration: < 11.0 mg/l
(< 1.0 mg/l + 10 mg/l)
Sample 1 Load: < 45.9 lbs/day (<
11.0 mg/l x 0.5 MGD x 8.34)
Sample 2 Concentration: < 7.0 mg/l
(2.0 mg/l + < 5.0 mg/l)
Sample 2 Load: < 35 lbs/day (< 7.0
mg/l x 0.6 MGD x 8.34)
Average Monthly Concentration: < 9.0
mg/l ((11.0 mg/l + 7.0 mg/l) / 2, use the < symbol)
Total Monthly Load: < 1,214 lbs (((<
45.9 lbs/day + < 35 lbs/day) / 2) x 30 days in June)
For more information on discharge monitoring
reports, visit www.depweb.state.pa.us,
keyword: Wastewater Information 3800-BK-DEP3047 Rev. 10/2011 or through
eLibrary at http://www.elibrary.dep.state.pa.us/dsweb/Get/Document-88321/3800-BK-DEP3047.pdf.
Best Management Practice Information
The following BMP Descriptions document
provides a listing, a description and efficiencies for Agriculture,
Urban and Mixed Open BMPs that have been or are pending approval for
use in the Chesapeake Bay Program Watershed Model (version 4.3).
Note: These BMP descriptions may be updated
and corrected as needed, so please check this website prior to submitting
a request for certification to ensure that you use the most up-to date
description and efficiency.
BMP
Descriptions (PDF)
Edge of Segment and Delivery Ratio
The Edge of Segment (EOS) ratio is a ratio
that identifies the amount of a pollutant expected to reach the surface
waters at the boundary of a Chesapeake Bay Watershed Model segment through
surface runoff and groundwater flows from a pollutant source within
a watershed segment.
The Delivery Ratio is a ratio that compensates
for the natural attenuation of a pollutant as it travels in water before
it reaches a defined compliance point.
To identify the appropriate EOS and Delivery
ratios for the pollutant activity location, please review the Watershed
Segment Map and Ratio Table.
Note: The EOS and the Delivery ratios
for the watershed segments may be updated and corrected as needed, so
please check this website prior to submitting a request for certification
to ensure that you use the most up-to date ratios.
Watershed
Segment Map and Ratio Table (PDF)
Tradable Load
The tradable load is the amount of nonpoint
source pollutant reduction determined to be the projected future pollutant
load that is the difference between the total reduction theoretically
possible from maximum implementation of pollutant reduction activities,
and the reduction associated with a level of pollutant reduction activities
identified by the Department as reasonably attainable. The annual sum
of all credits certified from nonpoint sources in the Commonwealth's
portion of the Chesapeake Bay Watershed may not exceed the applicable
tradable load calculated by the Department for the Commonwealth's portion
of the Chesapeake Bay Watershed. The following document outlines how
this tradable load was derived.
Note: The tradable load may be updated
and corrected as needed, so please check this website for the most up-to
date information.
PA's
Tradable Load Description (PDF)
Swine Manure Information
The report entitled “Manure Production,
Analysis, and Estimates of Nutrient Excretion in Swine” compiled
by Mr. Ken Kephart was approved by the State Conservation Commission
(SCC) Board in 2009. This report includes data that will be put into
an easy to read new hog manure chart that will be used by the Nutrient
Management Program. At this time, a person submitting a request for
certification related to swine manure should use the appropriate values
contained in the report when completing calculations or supplying documentation
to support the request.
Manure
Production, Analysis, and Estimates of Nutrient Excretion in Swine Report
(PDF)
|
