3.3.3 Havelock– Sources Historically the water supply for Havelock was drawn from bores close to the shore of the current port area. These were abandoned due to increasing salinity and the current town supply was bored further south in the Kaituna Valley and commissioned in 1992. Exploration of a deeper aquifer in 2006 proved to be low yielding and a second bore was drilled close to the existing supply in 2007. Winter demand of around 600 m/day increases to 1,000 m/day during the3 3 summer. Abstraction rates of 14 l/sec are expected to rise to a combined 25 l/sec with the consent limit at 2,000 m/day. However in periods of low rainfall and high abstraction there is3 evidence of increased conductivity in the source water indicating saline intrusion of the aquifer. A condition of the resource consent restricts abstraction rates as conductivity rises. Methods of demand management are being investigated to avoid restrictions associated with saline intrusion. Havelock Treatment and Reticulation The bores supplying Havelock are into unconfined aquifer that does not meet the requirements of the DWSNZ and additional treatment for disinfection of bacteria and protozoa is required. Plans to meet the DWSNZ by 2015/17 have been delayed whilst affordability issues are worked through with the community. The old concrete reservoirs were replaced in 2011 with a single 360 m steel tank equivalent to3 approximately 50% of daily demand. A second steel tank is planned for 2018/19. The old 5” cast iron main in Lawrence Street was upgraded to 150 mm PVC in 2009. 3.3.4 Renwick Sources The existing three wells supplying Renwick are located along a north-south alignment to the northwest of Renwick. The wells are drilled into a shallow unconfined aquifer that is recharged by infiltrating rainfall, surface and sub-surface seepage from the Renwick Terrace to the south and seepage from the Wairau River to the north. The Wairau aquifer will influence the northern well more than the southern well. The existing three bores at Terrace Road have three major problems - one is the unacceptable turbidity in the source wells when Gibsons Creek is running with very high turbidity, secondly, the elevated concentration of nitrate and other contaminants that occur seasonally, and lastly the inability of supply to meet future predicted summer demand. In the summer of 2014 water restrictions were imposed from 20 February to 2 April due to low level of water in the abstraction bores. New bores were drilled at Conders Bend Road in 2008. Yield from the bores is satisfactory. A pipeline to connect the bores to the treatment plant will cost an estimated $960,000. The work will be programmed once decisions have been made on the treatment options and demand management plan for the settlement. Radio-isotope dating of the groundwater has been undertaken and is currently being repeated to determine the age of the water. This will help to determine the level of treatment required to meet the DWSNZ. Renwick Treatment and Reticulation The Urban Growth Strategy considered the western edge of Renwick to be more suited to future development. This is in reasonable proximity to the existing treatment plant at Boyce Street and could be readily supplied from there. 3.3.5 Riverlands Sources and Treatment Figure 11. Abstraction Volumes from CBBP Bores shows the current level of abstraction in relation to the consent volumes. The bore at Malthouse Lane and the two supplementary bores Page 48