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Borehole Prognosis and Assessment of Impact on Nearby Spring Supply

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Borehole Prognosis and Assessment of Impact on Nearby Spring Supply Borehole Prognosis and assessment of impact on nearby spring supply Moorfield Barn, Derbyshire Level, SK13 7PR For: Paul Knowles Managing Director Arnfield Care Ltd by Carbon Zero Consulting Tel. 01572 729510 Unit 4, E-mail. [email protected] 2B Gaol street Web. www.carbonzeroco.com Oakham , Rutland, LE15 6AQ October 2019 TABLE OF CONTENTS 1 Background Information ................................................................................................................................................. 1 2 Summary .......................................................................................................................................................................... 2 2.1 Borehole water supply ...................................................................................................................................................... 2 2.2 Risk assessment on potential impact on nearby spring and borehole ........................................................................... 2 3 Moorfield Barn, location and setting .............................................................................................................................. 3 3.1 Site location ........................................................................................................................................................................ 3 4 Summary of Geology and Hydrogeology ....................................................................................................................... 4 4.1 Geological setting............................................................................................................................................................... 4 4.2 Summary table of geology and hydrogeology ................................................................................................................. 6 4.3 Proposed Borehole Construction ...................................................................................................................................... 7 4.4 Drilling risks ........................................................................................................................................................................ 8 4.5 Water treatment ................................................................................................................................................................ 8 5 Risk assessment of potential impact of a new borehole abstraction ........................................................................... 9 5.1 Location of new borehole ................................................................................................................................................. 9 5.2 Potential impact of new abstraction on nearby spring ................................................................................................... 9 6 General Guidance .......................................................................................................................................................... 11 LEGEND GSHP Ground Source Heat Pump BGS British Geological Survey CZC Carbon Zero Consulting EA Environment Agency GSHC Ground Source Heating and Cooling m bgl Metres Below Ground Level m bwt Metres Below Well Top m OD / mAOD Metres Above Ordnance Datum RWL Rest Water Level PWL Pumped Water Level SPF Seasonal Performance Factor DHW Domestic hot water TD Total Depth Appendix; Nearby borehole Logs, Rose Bank, Kidd road. © Carbon Zero Consulting Ltd. 2019. Carbon Zero Consulting Ltd. Registered office: Gaol street, Oakham, Rutland, LE15 6AQ Any report provided by Carbon Zero Consulting Ltd. (“CZC”) is for the client's use and may be reproduced by the client for internal use. The report must not be issued to third parties without the express written consent of CZC. If the report is released to any third party, CZC will not accept responsibility or liability of any nature to that third party to whom the report (or part thereof) is released. Moreover, CZC will accept no liability for damage or loss as a result of any report being made known to, or relied upon by, a third party, unless expressly agreed with CZC in writing. Carbon Zero Consulting Ltd Moorfield Barn Prognosis and Risk Assessment Borehole Prognosis 1 Background Information Address: Moorfield Barn, SK13 7PR Elevation: 237mAOD Required Yield Less than 2m3/day. Use Potable water supply This Borehole Prognosis is provided for the above address. The report aims to determine the viability of drilling a borehole at the above address to provide the building with a potable water supply for domestic consumption. The daily total volume of water required is proposed to be less than 2m3/day and thus not requiring a water abstraction license from the Environment Agency as there is no regulation of abstraction up to a maximum of 20m3/day. The objectives of this report are outlined as follows: To outline and investigate the feasibility of abstracting a small domestic supply of groundwater for the above address. This will include assessment of yield from nearby boreholes penetrating the underlying aquifer and analysis of the aquifer potential to meet the required demand. To provide detailed geological interpretation of the underground strata and determine an optimum depth for the well to be drilled. To comment on the potential impact of the proposed abstraction on a nearby spring supply and a nearby private water supply. Unit 4, 2B Gaol street e [email protected] Oakham, Rutland, LE15 6AQ t 01572 729510 w www.carbonzeroco.com Carbon Zero Consulting Ltd Moorfield Barn Prognosis and Risk Assessment 2 Summary 2.1 Borehole water supply (Qualitative) Percentage chance of obtaining water at given rate 0 – 20% No Chance to very low probability 20 – 40% Poor to Moderate 40 – 60% Moderate to Good 60 – 80% Good to very good 80 – 100% Very good/ high probability The potential for water being available from a borehole at Moorfield Barn at a rate of up to 2m3/day is judged as 80% - 100%. The same would be true of an abstraction of up to 20m3/day. The geology of the area comprises sandstone and shale of the Millstone grit formation of Namurian (Carboniferous) age. The rest water level of a borehole drilled in this area is approximately 10mbgl The site is not in an area of risk of mining. As the local area is predominantly agricultural there is some potential for the presence of contamination from fertilisers and other agricultural activities. The site is not within an Environment Agency groundwater source protection zone (SPZ) and is to the west of the Peak District SSSI. A search should be made for the presence of water, power or sewerage services prior to drilling. Further guidance on borehole design is provided in the body of this report. 2.2 Risk assessment on potential impact on nearby spring and borehole A borehole drilled at the barn would take water from sandstone layers approximately 35m – 50m below ground level and so separated vertically from the base of the nearby spring by about 50m. Much of this 50m section would be made up of impermeable shale as seen in the nearby geological record from the borehole at Rose Bank, section 4.3 and Appendix. Abstraction of water from a new borehole drilled at the barn would have no impact upon the flow, collection or utilisation of water from the spring located up-gradient of the proposed borehole. Abstraction of water at a rate of 2m3/day from a borehole drilled at the barn would have no measurable impact on the existing borehole and abstraction located at a distance of 450m to the south-west at Rose Bank. Likewise, there will be no measurable impact on the flow or quality of water taken from springs located near to Jumble Farm. It should be noted that the proposed abstraction for domestic water consumption is to be less than 2m3/day. This is very much less than the limit of abstraction requiring an Environment Agency licence, being 20m3/day. Page 2 Carbon Zero Consulting Ltd Moorfield Barn Prognosis and Risk Assessment 3 Moorfield Barn, location and setting 3.1 Site location The Barn is located at grid reference SK 04761 92839 and at an elevation of 237mAOD, to the south-east of Glossop. High ground of over 500m is located to the east with a smaller hill to the west. The Bray clough flows to the west at a distance of 600m to the south of the barn. The barn is located outside of the large area of special scientific interest (SSSI) to the east. Moorfield barn Rose Bank Borehole Moorfield barn SSSI Figure 1 and 1a. Site location and site setting. Ordnance Survey Licence/Customer Number (100060212) Page 3 Carbon Zero Consulting Ltd Moorfield Barn Prognosis and Risk Assessment 4 Summary of Geology and Hydrogeology 4.1 Geological setting Geological map number 99 for Chapel en le Frith shows Moorfield barn to be located on the ‘d4’ formation being the Millstone Grit Series of Namurian age within the Carboniferous (about 322 million years old). Subdivision of the d4 series are seen adjacent to the barn, including ‘KG’ formation (KG being Kinderscout Grit). A section of the map is shown in Figure 2. In general, the Millstone grit consist of a thick series of sandstone, shale and mudstone beds. The sandstone layers in particular can be quartz-rich and very hard. Figure 2 shows the beds to the south of the barn to be dipping to the west-north-west at an angle of about 14°. The shale layers have a low intrinsic porosity and permeability. The sandstone has higher porosity, but flow of groundwater is governed
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