84-046 ORD PROVIDING CODE OF ORDINANCES BE AMENDED BY REVISING CHAPTER 31 SECTIONS 31-59 AND SECTION 31-91 OF SAID CODE
ORDINANCE NO. 84-046
AN ORDINANCE OF THE CITY OF PARIS, PARIS, TEXAS, PROVIDING
THAT THE CODE OF ORDINANCES, CITY OF PARIS, BE AMENDED BY
REVISING CHAPTER 31, 5ECTIONS 31-59 AND SECTION 31-91 OF SAID
CODE; ESTABLISHING THE LIMITS OF PERMISSIBLE AMMONIA DISCHARGE
INTO THE SANITARY SEWERS OF THE CITY OF PARI5 AND ESTABLISHING
SURCHARGES FOR THE EXCEEDING OF SAID LIMIT; PROVIDING FOR A
PENALTY NOT TO EXCEED $200.00; REPEALING ALL ORDINANCES OR
PARTS OF ORDINANCES IN CONFLICT HEREWITH; AND PROVIDING FOR
EFFECTIVE DATES OF JULY 1, 1984 AND JULY 10, 1984.
BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF PARIS:
Section l. That Section 31-59 of the Code of Ordinances of the City
of Paris, Paris, Texas, be amended by adding thereto the following:
"Section 31-59. Specific pollutant limitations.
Not to exceed
(all values are in mg/1)
Monthly Daily Grab
Average Composite Sample
Ammonia 30 30 50
Section 2. That Section 31-91 of the Code of Ordinances of the
City of Paris, Paris, Texas, be amended so that such shall read as follows:
"Section 31-91. Surcharges.
•••(c) A surcharge shall be levied on ammonia concentrations
over 30 mg/1. Such surcharge shall be based on a direct ratio of
nitrogenous oxygen demand (NOD) to carbonaceous oxygen demand
(BODS) . This ratio is computed by dividing the 4.57 pounds of
oxygen which are required to convert one pound of ammonia to
nitrate by the 1.42 pounds of oxygen consumega the stabilization
of one pound of carboneous matter. The BOD5 shall be
multiplied by this ratio to determine an SCR ammonia which will
surcharge the oxygen demand of excess ammonia at a rate
equivalent to the oxygen demand of carbonaceous matter:
(1) The NOD / BODS ratio is established at 3.22 for
calculation of excessive ammonia surcharges.
(2) SCR ammonia shall be equal to the existing SCR BOD5
multiplied by 3.22. No charge shall be made for ammonia
levels of 30 mg/1 or less.
(d) Unless otherwise specified, samples shall be twenty-four
(24) hour composites. When a flow-recording device is provided
the samples may be flow-weighted; otherwise, a simple composite
sample shall be used.
(e) The surcharges shall be based on all samples taken in
the previous month or the most recent sample available. In no
case shall the sampling basis be less than two (2) twenty-four (24)
hour composite samples per year if a surcharge is levied.
(f) The City may elect to set a minimum surcharge. Regular
sampling may be suspended on those users, considered by the
Supervisor to be consistently below the minimum surcharge. When
sampling has been suspended, periodic grab samples may be used
to determine if regular sampling should be reinstated.
(g) Prior to the end of a surcharge period, the user may elect to
have his discharge resampled by the City for purposes of
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increasing the number of samples to be averaged during a
particular surcharge period if the user believes and the City
agrees that the additional samples will cause the average to better
reflect the users wastewater contribution for a particular
surcharge period. If City sampling equipment is unavailable, user
must supply the proper equipment at his own expense. The City
shall retake one sample for each sample taken in the normal
sampling program for a charge equal to the City's expense.
Sampling at the request of the user in greater frequency than
stated above shall be elective on the part of the Supervisor;
charges for such sampling shall be at a flat rate of three times the
City's cost.
The user may request, no later than the onset of sampling, a
split or duplicate of any sample taken by the City for surcharge
calculation or compliance with any portion of this ordinance."
CHARGE RATES FOR EXCESSIVE SURCHARGE
SCRBODS Charge SCRTSS Charge
dollars/mg/1/million gallons $ .7339 $ .5712
(h) Calculation of excessive strength surcharge:
SC- [ (BOD5 mg/1 - 250 mg/1) (SCRBOD 5 ) +
-
(TSS mg/1 - 250 mg/1) (SCRTSS) +(Ammonia mg/1 - 30
mg/1) (SCR ) ] X MG
ammonia
Where :
SC = Surcharge
BOD5 mg/1 = Average user BODS for surcharge calculation
250 mg/1 = allowable BOD5 and total suspended solids concentration
without surcharge
SCRBOD = charge rate for BODS
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TSS mg/1 = Average user TSS for surcharge calculation
MG = User wastewater contribution in million gallons for the month
or the user water usage whichever is applicable.
SCRTSS - charge rate for TSS
30 mg/1 = allowable ammonia level
SCRammonia = (3.22) ( SCRBQD5)
NOTE• The 5CRS5 and 5CRBOD 5 are rates based on one (1)
mg/1 in one (1) million gallons of wastewater.
(i) Shortened capacity life surcharge: Since BOD and 5S
concentrations in excess of 250 mg/1 will tend to use up the capacity of
the treatment plant, there is a cost incurred for the shortened useful
capacity of the treatment plant, which shall be recovered as follows :
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(1) Determination of monthly average BOD5 of the treatment plant
influent through twenty-four hour composite sampling and lab
analysis reported in pounds per day.
(2) Using a predetermined strength for normal domestic waste-
water from the City of Paris, Paris, Texas, industrial
contribution will be determined by calculating the difference
between the actual BOD and SS received and the amount that
should have been received according to normal domestic
strength.
(3) Each month, using the plant design capacity, the amount in
excess of normal domestic wastewater will be determined as a
percentage of plant capacity; percentage will be assumed to
be the reduction in useful plant capacity life, to be converted
to years using plant design criteria.
(4) A difference in debt services on the treatment plant between
designed useful capacity life and calculated useful capacity
life for that month using the Capital Recovery Factor Formula
i n
n _1 will be determined.
(5) This recovery figure will be spread over those non-domestic
users exceeding normal domestic wastewater limits according
to their contributions to the total excessive strength flows.
(j) Calculation of shortened capacity life surcharge:
Where :
A= Average monthly monthly measured BOD5 at
wastewater plant (lbs. per day)
B= BOD5 in pounds at wastewater plant if received at
predetermined normal domestic wastewater strength.
C= Design life of wastewater plant (month).
E= Adjusted capacity life (months)
F= Construction cost for treatment plant.
G= Amount in dollars to be proportioned among excessive strength
non-domestic users for any given surcharge period.
H= Individual non-domestic user's average BODS contribution (lbs)
in excess of normal domestic wastewater as quantified from City
sampling data during the surcharge calculation period.
I= Shortened capacity life surcharge.
E= B (C)
A
G= F i (l+i)E -F i (l+i)C
(1+0 E-1 (l+i)C -1
I= (G) H
~ H
Shortened capacity life surcharge shall be calculated monthly.
(k) Total surcharges:
(1) Total surcharge shall be the sum of the excessive strength
surcharge plus the shortened capacity life surcharge.
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(2) Excessive strength surcharge rates will be recalculated at the
beginning of each fiscal year using the actual costs from the
previous year with such rate becoming effective September 1.
Excessive strength surcharge rates shall be based on cost to
treat.
Section 3. Any person violating any of the provisions of this ordi-
nance shall be guilty of a Class "C" Misdemeanor, and upon conviction shall
be fined in any sum not to exceed $200.00, and each and every day's con-
tinuance of any violation of the above enumerated section shall constitute and
be deemed a separate offense.
Section 4, All ordinances or parts of ordinances in conflict herewith
are hereby expressly repealed.
Section 5. This ordinance shall become effective as to the
amendment to Section 31-59 on the lOth day of July 1984 and as to the
amendment to Section 31-91 on the lst day of July, 1984.
Passed and adopted this 27th day of June, 1984.
J Graham, ayor
Attest :
~
H. . G eene, City Clerk
APPROVED T FORM:
.
T. K. Haynes, City Attorney
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