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SDC Stratford WWTP Annual Report 2021-2022

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and is then pumped to the effluent treatment plant and discharged via the marine outfall. Stormwater from the tankage area is pumped over into the process sewers which flow to the storm pond. The stormwater falling on the non-process areas of the western half of the site (Figure 1) is directed by “v” ditches running alongside the roads to a dam/pond and then out to the Tasman Sea via the Manu Stream. Stormwater falling on the eastern side of the site is directed to unnamed tributaries of the

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sea, but these are generally few in number and only the rare spills have a major and indeed measurable impact on seafoods in the area. “Indirect” discharges is a term used to generally describe the effects of rivers on the coast, and therefore include the considerable amounts of faecal bacteria, nutrients and solids carried down the Waitara River after rain on the farms and hill country upstream (now seen as the major source of these in local seafoods). The material and

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is approximately 6.1 km2. The length of the catchment, from the headwaters between Paraite and Corbett Roads to the sea at Bell Block beach, is approximately five kilometres. The industrial area at Bell Block is situated mid-catchment (Figure 1). Historically, the industrial areas were located predominantly on the western side of the stream however ongoing development since 2016 has resulted in more sites on the eastern side. These sites fall under permitted activity rules and are not

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Company communicated that two different delivery systems were used during the 2023/24 monitoring year: 1. Dribble bar – main method of effluent application, depths applied (~3mm) page 12 2. ‘Weta’ travelling rain gun – used to apply effluent to the Sand Dune block at 8-10mm depths during 7 months of the year. Type of crops grown Two crops were grown under the cut and carry system in 2023/24. Maize Silage paddocks (37.2ha) which were cultivated in October and

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between inlet works and screenings building blocked up with rags causing wastewater discharge. N No Blockage cleared, site cleaned and sanitised. Procedures updated to prevent reoccurrence. 22 August 2022 Heavy rainfall caused high flows at the inlet works overwhelming band screens N No Problem resolved as rain eased and inflows reduced. 22 August 2022 High rainfall caused Clarifier 3 to overwash. N No Overwash stopped as rain eased. 26

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being undertaken to reduce the footprint of the pad. This would greatly reduce the volume of stormwater collected within the pad. Consequently there would be less pumping to the wetland treatment system and therefore, generally an increase of retention time within the treatment system. RNZ were instructed to ensure that uncontaminated storm water runoff was unable to enter the paunch pad, so that only the rain that falls into the pond is required to be pumped through the wetland treatment

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the contained area or soak hole, even in the heavy rain occurring at the time of inspection. Overall the site looked tidy and appeared to be well managed at the time of inspection. 21 February 2019 The site has had a few new loads of green waste placed on it. There was no evidence of any stormwater or leachate discharge on site and there was nothing collected in the contained corner of the site. Overall the site was being managed in an appropriate manner at the time of inspection. …