As requested piease f'ifid a-ttcched report on estirnzted w211

Transcription

1 .. Wa t E.;" Pi il r: agma n t Bra fi ci1 Ministry of Envi roririi2ri.t As requested piease f'ifid attcched report on estirnzted w211 dri'i?in5 msts Pur the above. should you require clatificat:lcn Oii any aspects of this xport please cnrtt,act cur off.ice directlye i i

2 T& Dr. J.C. Foweraker, Head Date: October 6, 1981 Groundwater Section Water Management Branch File: 82 E/14 Re: Ellision Irrigation District At the request of Mr. F.N. Manson, Chief of the Community Water Supply Section a review of groundwater prospects has been completed, for the above area,and preliminary cost estimates have been prepared for the drilling and developing of up to two testproduction wells. Some 1,000 gpm would be required from a groundwater source to extend water servi ce to currently undeveloped lands within the District's boundaries. Previously, Groundwater staff (Le Breton, 1974) prepared cost estimates for the Scotty Creek Irrigation District for drilling and testing wells up to 340 feet in depth in this general area. General Geology The Ellison Irrigation District located near Kelowna is situated north of Scotty Creek along the east side of the Okanagan Valley. The District is underlain by unconsolidated deposits (Figure 1) including gl aci a1 1 acus tri ne, kame terrace and a1 1 uvi a1 deposi ts (Nasmi th, 1962). These deposits may be several hundred feet thick in the Mill Creek Valley. Bedrock of the Monashee Group comprised of layered gneiss and schist (Little, 1961) occurs on the upland east of the District. Groundwater Prospects Prospects for obtaining groundwater within the unconsolidated deposits are encouraging as evidenced by several large capacity wells with reported well yields in the range 60 to 100 gpm along the western boundary of the District. A few large capacity wells with yields up to 1,000 gpm are also reported close to the southern boundary of the District. An area at the southeast corner of the District's boundary has been outlined as a favourable location for a well with respect to the layout of the water system and property acquisition. This site is located on an alluvial fan where Scotty Creek enters the Okanagan Valley. A 198 foot, 8inch diameter well completed in this general area for Kelowna Ranches encountered waterbearing gravels from 155 to 198 feet and was rated by the driller at a maximum of 205 gpm. Test'drilling in this area should be carried out to at least 300 feet to ascertain the groundwater potential. Other areas in the vicinity of the District show promising groundwater potential and should be considered for test drilling. These areas are outlined in Figure

3 .! 2 Dr. J.C. Foweraker October 6, 1981 C b Estimates Costs for drilling, completing and testing one 300 foot, 8inch diameter testproduction well which if successful could be capable of supplying 500 gpm are estimated at approximately $25,000 not including engineering supervision. If preliminary testing is successful costs to complete one 12inch diameter well to a depth of 300 feet and capable of providing 1,000 gpm would be approximately $40,000 not including engineering supervision. The basis of these cost estimates are shown in Tables 1 and 2 attached. Recommendations All test drilling and pump testing should be carried out under the supervision of a groundwater engineering consultant. A cabletool drilling rig should be used for construction of the production wel!. Where well sites are situated below approximate elevation of 1,400 special drilling precautions should be taken for encountering possible flowing artesian conditions. AP K/ dma References A.P. Kohut Senior Geological Engineer Groundwater Section Water Management Branch Le Breton, E.G Water Well Costs for Scotty Creek Irrigation District, B.C. Ministry of Environment, Groundwater Section, File 82 E/14. Little, H.W Geology, Kettle River (West Half), British Columbia, Geological Survey of Canada, Map Nasmith, H Late Glacial History and Surficial Deposits of the Okanagan Valley, British Columbia, B.C. Dept. of Mines and Petroleum Resources, Bulletin No. 46.

4 Table 1. Itemized costs to complete one 300 foot, 8inch diameter test production well by cable tool method. 1. Mobilization and Demobilization (Crew and Equipment) $ (a) Drill and case 12" diameter surface casing $64 per foot, exrmate 15 feet $ 960 (b) Drill and case 10" $48 per foot, estimate 185 feet $ 8,880 (c) Drill and case 8" $38 per foot, estimate 100 $ 3, Casing 10" $ I' $16.25 per foot, estimate 15 feet " diameter $92 per ft. estimate $ 270 $ 3, feet $ " diameter screen fittings $ " diameter drive shoe 8 'I $ 324 $ Miscellaneous hourly $ 60 per hour estimate 20 hours $ 1, $50 per hour estimate 16 hours $ $7 per foot REBATE 8" diameter casing $ Pump $50 per hour duration of 24 hours $ 1, Pump test mobilization $ " diameter well seal $ packer $ 100 TOTAL $ 22, % Contingincies $ 3,423 $ 26,242

5 i Table 2. Itemized cost to complete one 300 foot, 12inch diameter production well by cable tool method Mobilization and Demobilization (Crew and Equipment) $ 500 (a) Drill and case 20" diameter surface casing $95 per foot, estimate 15 feet $ 1,425 (b) Drill and case 16" $70 per foot, estimate 185 f e z $ 12,950 (c) Drill and case 12" $64 per foot, estimate 100 $ 6,400 Casing 16" $ " 18.OO per foot, estimate 15 feet " diameter $137 per ft. estimate 25 feet $ 525 $ 5,600 $ 1,440 $ 3, " diameter screen fittings 16" diameter drive shoes 12" Miscellaneous hourly $60 per hour estimate 40 hours $50 per hour estimate 16 hours $7 per foot REBATE 12" diameter casing $ 100 $ 1,192 $ 450 $ 2,400 $ 800 $ 2, Pump $50 per hour duration of 24 hours 11. Pump test mobilization " diameter well seal " 10" reducer packer $ 1,'200 $ 300 $ 100 $ 700 TOTAL $ 37, % Contingincies $ 5,611 $

6 I c.i TO ACCOMPPNV REPORT ON

7 DATE SCALE. VERT I mf "*' /'526m' FILE No 82 El4 DWG No BClL7290 WRS F/&OP 1 ENGINEER