HORIZONS’ COMPLIANCE REPORTS FOR THE RDC’S LEACHATE DISPOSAL

Compliance Reports March 2012-July 2012

13.  March 2012

 

26 March 2012
Rangitikei District Council (Marton)                                              Consents:7312 and 7313
Private Bag 1102                                                                             File:5/8/RDC
MARTON 4741                                                                             RAR:
Attn: Adrian van Niekerken
LOCATION:      MARTON SEWAGE TREATMENT PLANT                           MAKIRIKIRI ROAD, CROFTON
 Performance Assessment:

Did I comply with the conditions of my consent? No

 

The purpose of this assessment is to assess compliance with resource consent 7312 and 7313.

This report relates to the above site visit and an assessment on the information held on our files covering the period 13 February 2012 to 22 November 2012. Below are copies of the relevant consent conditions along with comments from the assessment relating to compliance

GENERAL CONDITIONS APPLICABLE TO PERMIT 7312

Receiving Water Quality

1.      The discharge shall not:

a.     cause the production of any conspicuous oil or grease films, scums or foams, or floatable or suspended materials in the receiving waters; or

A site visit did not coincide with this assessment

Not assessed

b       cause any emission of objectionable odour; or
HRC has not received any odour complaints associated with the Marton STP during this assessment period.

Comply

C.      render receiving water unsuitable for consumption by farm animals; or

There is insufficient information available to assess this condition

Not assessed

d.      have any significant adverse effects on aquatic life; or

Based on evidence presented in relation to the One Plan hearings, a change of 20% in the QMCI value is considered to be significant.

There is insufficient evidence to assess this condition.

Not assessed

e.      cause a change in horizontal visibility, defined as the horizontal sighting range of a 200 millimetre diameter black disc, by more that 30%; or, where stream flow is so low as to make horizontal visibility measurement impracticable, or where there is no stream flow upstream of the outfall, cause turbidity to exceed 20 NTU; or

A site visit did not coincide with this assessment.

Not assessed

f.       cause a conspicuous change in colour, or

A site visit did not coincide with this assessment

Not assessed

g.      cause the daily average concentration of ammonia (NH4 N) to exceed 2.0

         grams per cubic metre at water temperatures equal to or less than 15Co, or 2.8.grams per cubic metre at water temperatures greater than 15Co; or

Marton WWTP – Ammonical Nitrogen – HRC data
Date Down Stream Up Stream Increase Temperature Limit
15-Mar-12 0.28 0.023 0.257 16.3  2.8
 4-Apr-2012 0.28 0.01 0.27 16.8  2.8
17-May-12 1.7 0.096 1.604 9.5  2.0
 7-Jun-2012 2.1 0.033 2.067 10.9  2.0

 

Marton WWTP – Ammonical Nitrogen – RDC data
Date Down Stream Up Stream Increase Temperature Limit
24-Feb-12 0.07 0.01 0.06  2.8
 27-Mar-2012 0.62 0.08 0.54  2.8
26-Apr-12 0.02 0.01 0.01  2.0
 23-May-12 8.03 0.07 7.96  2.0
21-Jun-2012 0.45 0.12 0.33  2.0

The Ammonia concentrations exceed the specified limits on occasions

Significant Non Comply 

h.      cause the daily average carbonaceous BOD5 concentration due to dissolved organic compounds (that is, material passing through a GF/C filter) to exceed 2.0 grams per cubic metre;

Marton scBOD5 – RDC data
Date Down Stream Up Stream Limit
24/02/2012 <1 2
27/03/2012 <1 2
26/04/2012 <1 2
23/05/2012 1 <1 2
21/06/2012 1 <1 2

During this assessment period the scBOD5 concentrations have been displayed as less than. It is important that the accuracy of the test is at least less than 2 given the limit is 2. Based on the RDC results presented it is impossible to assess this condition. In the future if a scBOD5 concentration is less than a value greater than 2 an exceedences will be assumed to have occurred. And a non compliance issued.

Unable to assess

Monitoring and Reporting

2.      The Consent Holder shall undertake monthly monitoring of the following parameters in the effluent: 

·        flow

·        pH 

·        temperature

·        ammonia nitrogen

·        dissolved oxygen

·        dissolved carbonaceous BOD5

·        suspended solids

·        faecal coliforms

·        dissolved reactive phosphorus

·        nitrate nitrogen

a.     for the purpose of monitoring compliance with Conditions 1(g) and 1(h) of this Consent, instantaneous grab sampling will suffice for monitoring of ammonia nitrogen and dissolved carbonaceous BOD5 except where monitoring results show that the concentrations in the grab sample exceed, or nearly exceed, the concentration values in conditions 1(g) or 1(h), in which case the Consent Holder shall, in consultation with the Regional Council, undertake monitoring over a 24 hour period;

b.       Analysis of the above parameters (except flow) shall be undertaken by a certified laboratory;

c.        The monitoring in this condition shall coincide with the monitoring undertaken pursuant to Condition 3;

d.       Where the laboratory used is not the Regional Council laboratory, results shall be forwarded to the Regional Council in January, April, July and October of each year; the results forwarded shall include monitoring for the three month period immediately preceding the reporting month.

RDC analyse their samples for the above specified parameters with the exception of temperature. Temperature is measured in the field at the time of sampling. As some of the standards are linked to temperature it is important that temperature at the time of sampling is entered into the spread sheets that are forwarded to HRC.

RDC send their samples to Hills Laboratories which is accredited to analyse water samples for the above identified parameters. RDC forward all of the required sampling results to HRC on a quarterly basis.

Comply

3.      The Consent Holder shall undertake monthly monitoring of water quality in Tutaenui Stream immediately upstream, and 500 metres downstream, of the discharge outfall. The parameters to be monitored shall include:

·        black disc visibility

·        colour

·        ammonia nitrogen

·        dissolved carbonaceous BOD5

·        suspended solids

·        particulate organic matter

·        faecal coliforms

·        dissolved reactive phosphorus

·        nitrate nitrogen

·        temperature

·        dissolved oxygen

·        pH

a.      the monitoring in Condition 3 shall coincide with the monitoring undertaken pursuant to Condition 2;

b.      where the laboratory used is not the Regional Council laboratory, results shall be forwarded to the Regional Council in January, April, July and October of each year; the results forwarded shall include monitoring for the three month period immediately preceding the reporting month.

See condition 2

Comply

4.      The Consent Holder shall conduct an in stream biota survey, including benthic invertebrates and periphyton, during low flows in Tutaenui Stream, once every 3 years from the date of issue of this consent, for the duration of the consent. The survey shall be carried out at four locations: immediately upstream of the discharge outfall, about 50 metres downstream of the outfall, about 500 metres downstream of the outfall, and at Curls Bridge. The Consent Holder shall forward a report on the survey results to the Regional Council within 3 months of the completion of each survey.

A macroinvertebrate report is due in 2012. Discussions with RDC have indicated that a macroinvertebrate report has been commissioned. Please forward a copy of the Macro invertebrate report as soon as it has been completed.

Comply

5.      The Consent Holder shall notify the Regional Council whenever it is apparent that a breach in consent conditions has occurred or may be about to occur, and whenever any complaints are received regarding the discharge.

RDC keep HRC well informed of what is occurring on site in relation to any issues that may result in non compliances. The monthly samples that RDC take are also forwarded to HRC on a quarterly basis.

Comply

GENERAL CONDITIONS APPLICABLE TO PERMIT 7313

1.      There shall be no offensive or objectionable odour beyond the property boundary that arises from the release of odorous emissions from the receival, handling or treatment of sewage on the property.

During the site visit I did not detect an odour beyond the property boundary that I considered to be objectionable. HRC have not received any odour complaints in relation to the Marton STP.

Comply

2.      Dissolved oxygen in the second of the three treatment ponds shall be greater than 1.0 grams per cubic metre at all times. The dissolved oxygen in the second pond shall be continuously monitored and recorded. Records shall be available for inspection at all times, and shall be forwarded to the Regional Council on request.

Please confirm that the Dissolved Oxygen concentration in treatment pond three is greater than 1.0g/m3

Comply

3.      Algicides shall not be used for the mitigation of algal blooms without prior consultation with the Regional Council, and approval as to methods of application.

Based on conversations with Adrian van Niekerken, Algicides are not used at the Marton STP.

Comply

4.      There shall be no change to the process that substantially changes the quantity or nature of emissions to air from the site without prior consultation with the Manawatu Wanganui Regional Council.

RDC have not made any changes to the Marton STP that would increase or change the nature of the emissions.

Comply 

Reporting

5.      The Consent Holder shall maintain a complaints register, which shall record:

a.      public complaints regarding odour, and the time they were received;

b.      weather conditions at the time of the complaint including (but not necessarily limited to) an estimate of wind speed and direction;

C.      plant operations or malfunctions at the time of complaint; and

d.      remedial measures or other action taken as a result of the odour complaint.

The register shall be made available to the Regional Council on request.

Based on conversations with RDC there have been no odour complaints during this assessment period.

Comply

6.      The Consent Holder shall notify the Regional Council whenever it is apparent that a breach in consent conditions has occurred, or may be about to occur.

HRC are not aware of any breaches associated with this consent.

Comply

Recommended:As discussed under 1(f) the clarity of the discharge needs to be improved to ensure that the discharge complies with the above standards.

Please provide details of when the Marton WWTP is to be upgraded in the 2013-2014 financial year. If RDC know how they are going to address the high ammoniacal nitrogen concentrations please specify.

If you have any queries about this report, please contact me on 0508 800 800 ext. 862, 021 247 7341 or email Robert.Rose@horizons.govt.nz.Regards

 

Robert Rose

ENVIRONMENTAL COMPLIANCE OFFICER

Inspection details:
Officer: Robert RoseInspection type: Routine

Consent no: 7312

Inspection time: 1/07/2012 10:30Cost of inspection (excl. GST): $0.00

Consent type: Discharge Permit

 

 

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