Current through Register Vol. 50, No. 9, September 20, 2024
A. Facility Complexity Designation
1. Determine the specific industrial category
applicable to the facility.
2. From
the permit application, determine SIC codes. Also determine processes and
products reported. Compare this information to LAC 33:IX.1319 to determine the
applicable industrial category and the related complexity designation. When
more than one category applies, select the one with the highest complexity
designation. Record the SIC code applicable to the category selected in the
first SIC code blank and all other reported SIC codes in the second blank.
Record the SIC title.
3. Check the
applicable complexity designation and record the associated points in the
complexity points blank.
Note: Any industrial category not listed in LAC 33:IX.1319
is automatically assigned a Complexity Designation I except under the
circumstances noted in LAC 33:IX.1309.L.2.
4. The SIC codes listed in the tables are not
exhaustive and any questions concerning the appropriate SIC code or complexity
designation for a particular facility will be decided by the administrative
authority.
B. Flow
Volume and Type
1. Determine the wastewater
type and average discharge volume.
2. Review the permit application to determine
the composition of the wastewater discharge(s). If there are multiple
discharges, the composite of all discharges should be used. Compare the
relative magnitudes of process wastewater, noncontact cooling water and other
wastewaters with the definitions of wastewater types in Table 2 below, and
select the appropriate wastewater type (select only one type).
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Table 2 Types of Wastewater
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Wastewaters are divided into three types based on
their relative pollution potential.
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Type I
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Type I wastewaters are relatively uncontaminated.
They include noncontact cooling water only, or mixed flows which contain at
least 90 percent noncontact cooling water and not more than 1 mgd of process
wastewaters.
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Type II
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Type II wastewaters are the most contaminated.
They include process wastewater flows or any mixed wastewaters containing more
than 10 percent process wastewaters or containing more than 1 mgd of process
wastewaters.
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Type III
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Type III wastewaters include sanitary wastewater,
boiler blowdown, recirculating cooling system blowdown, water treatment
wastewaters and relatively uncontaminated surface run-off (contaminated surface
runoff should be considered process wastewater). Any mixture of these
wastewaters is considered Type III. A mixture which includes noncontact cooling
water is also Type III unless the noncontact cooling water exceeds 90 percent
of the flow (Type I).
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3.
Determine the total daily average wastewater discharge to the receiving water
based upon the information supplied to the department in the permit
application. If there are multiple discharges, the total of all daily average
discharges should be used. Under the selected wastewater type, where
applicable, answer yes or no and complete the formula.
C. Pollutants
1. Review the permit to determine if BOD,
COD, and TSS are limited. Points should only be assigned for these parameters
if they are limited in the permit. The permit limits used to determine
pollutant loads should be those limits currently in effect. Add the daily
average load limit for each parameter for all discharges.
2. Check the applicable load range for BOD
and/or COD, complete the formula, if applicable, and record the highest
associated points in the BOD or COD points blank. In some cases, oxygen demand
may be limited by some parameter other than BOD or COD [i.e., ultimate oxygen
demand (UOD), total organic carbon (TOC), or total oxygen demand (TOD)]. If
this is the case, substitute the alternate parameter for the COD criterion and
record the alternate parameter used in the blank indicated.
3. Check the applicable TSS load range,
complete the formula, if applicable, and record the associated
points.
4. Obtain the latest
reported toxic discharge to surface water information for the facility,
complete the formula and record the associated points. This information may be
updated and the rating revised if the annual report shows a change of at least
10 percent in the amount discharged.
5. Sum the totals A, B, and C and record the
total pollutant points in the space provided.
D. Temperature (Heat Load)
1. A heat load should be computed for large
thermal discharges. Such discharges are usually indicated by temperature limits
in the permit. Computation for a flow less than 10 mgd is unnecessary as it
will receive no heat load points.
2. Use maximum temperature limit in the
permit (maximum temperature reported in application if not limited in the
permit) and subtract 70° to compute
[DELTA]T in °F, then determine the
daily average heat load during the most critical conditions. This is usually
during the summer months when stream temperature and cooling water flow rates
are the highest.
3. If larger heat
loads are discharged at other time periods because of seasonal operations, the
daily average heat load for those periods should be used. The summer flow rate
may not be indicated in the permit application. It can be determined from
Discharge Monitoring Reports.
4.
Compute the heat load using the computed
[DELTA]T and the selected flow rate.
Check the applicable heat load range and record the associated points in the
heat load points blank.
E. Potential Public Health Points
1. Determine if the receiving water is used
for a municipal water supply.
2.
Review the complexity designation assigned in LAC 33:IX.1311.A. If groups I or
II were assigned, check the first complexity designation blank, record 0 points
in the public health points blank and go to the next instruction.
3. If a higher complexity designation (III,
IV, V, or VI) was assigned, then a determination if the receiving water is used
as a drinking water supply source must be made. To qualify for points under
this criterion, either the receiving water to which wastewater is discharged or
a water body to which the receiving water is tributary must be used as a
drinking water supply source within 50 miles downstream.
4. Check the appropriate complexity
designation blank and record associated points in the public health points
blank.
F. Major/Minor
Facility Designation
1. Determine if the
facility has been designated a major facility by the administrative authority.
If the answer is YES, then check the appropriate blank and assign 25 points.
If the answer is NO, then proceed to the next part.
2. Determine if the permitted effluent
limitations assigned were based on water quality factors in the receiving
water. Check the appropriate answer and assign the points required.
G. Total Rating Points. Sum the
rating points assigned to each of the six sections and record the total in the
total rating points blank.
AUTHORITY NOTE:
Promulgated in accordance with
R.S.
30:2001 et seq., and in particular Section
2014(B)
