FOR A PROPOSED SUBDIVISION ON SEACREST HILL

Transcription

1 I * * PROJECT NUMBER V PROOF OF WATER FOR A PROPOSED SUBDIVISION ON SEACREST HILL NORTHWEST OF OLIVER, B.C. Prepared for V-LINE CONSTRUCTION LTD. R.R. #1, No. 9 Road OLIVER, B.C. VOH 1TO Prepared by PACIFIC HYDROLOGY CONSULTANTS LTD Hornby Street VANCOUVER, B.C. V6C 3B6 JULY 5, 1996

2 PACIFIC HYDROLOGY CONSULTANTS LTD. Consulting Hydrogeologists Suite 330,580 Hornby Street, Vancouver, B.C., Canada V6C 386 Phone (604) Fax (604) July 5, 1996 Project No. V V-LKNE CONSTRUCTION LTD. R.R. #1, No. 9 Road OLIVER, B.C. VOH 1TO Attention: Mr. Ron and Mrs. Laura Venables Subiect: Proof of Water for a Proposed Subdivision on Seacrest Hill Northwest of Oliver, B.C. Dear Mr. and Mrs. Venables: 1.0 INTRODUCTION This letter, concerning proof of water for a proposed subdivision northwest of Oliver B.C., is further to discussions and correspondence during April through June 1996 between Mr. Ron Venables or Mrs. Laura Venables, of V-Line Construction Ltd., and Ann Badry, P. Geo., Hydrogeologist/Manager or Todd Hamilton, M.App.Sc., Hydrogeologist, both of Pacific Hydrology Consultants Ltd. (PHCL). This letter follows an onsite visit carried out by Mr. Hamilton in the company of Mr. and Mrs. Venables on May 18, The aforementioned discussions and site investigation concerned an evaluation of the potential to develop individual groundwater sources from domestic wells located on each of two 50 acre (20 ha) and one 60 acre (24 ha) parcel of land, designated as Lots 1, 2 and 3 respectively, to be created by subdivision of the property, which has previously been used for grazing livestock, growing market vegetables and raising domestic pets. The area location of the property, which is legally described as the N.W. % of Section 30, Township 50, S.D.Y.D., is shown on Figure 1 in Appendix A (Page A - 1); the proposed subdivision layout is shown on Figure 2 (Page A - 2). Regional District of Okanagan-Similkameen (R.D.O.S.) Bylaw No. 300, as amended up to October 1990, defines "Proof of Water" for groundwater supplies as follows: (b) Groundwater Supplies (i) For any proposed subdivision dependent upon individual groundwater sources of water for each parcel, the developer shall provide, on each parcel, prior to registration of the subdivision: in Electoral Areas A, B, C, D, E, F, and G, a well capable of providing a minimum yield of three (3) gallons (23.5 f) per minute for each proposed parcel; OR a detailed investigation report of groundwater conditions sufficient to evaluate water quality and the chances of constructing successful wells, which meet the above yield requirements, on all the parcels within the subdivision. w

3 V-Line Construction Ltd. Proof of Water for Proposed Subdivision on Seacrest Hill Northwest of Oliver, B.C. July 5, Page 2 Attention is drawn to the stated minimum yield of 23.5 Vmin; the metric conversion for quantity should read 13.5 Vmin (3 igpm). The proposed V-Line Subdivision is located within Electoral Area C, therefore, this letter-report has been prepared as "...a detailed investigation of groundwater conditions..." as the basis for "Proof of Water". The following published and unpublished documents were used in the preparation of this letter: 1. Regional District of Okanagan Similkameen Bylaw No A copy of a 1:10,000 scale plan, provided by the owner, showing the layout of the proposed subdivision. 3. N.T.S. Map 82E/4, Keremeos, of scale 1:50,000 and with a contour interval of 100 ft. 4. Water Well Location Maps 82E and 82E , of scale 1 :5000, prepared by Groundwater Section of B.C. Environment, along with the records of existing water wells in the area obtained from the B.C. Groundwater database system. Table 1 in Appendix B contains a summary of selected details about these wells. 5. Guidelines for Canadian Drinking Water Quality, (GCDWQ); Health Canada, Fifth Edition, B.C. Ministry of Energy, Mines and Petroleum Resources Bulletin 46, Late Glacial History and Surficial Deposits of the Okanagan Valley, British Columbia, by Hugh Nasmith, 1962, 46 pp. 7. G.S.C. Map 932A (Second Edition), Geological Map of British Columbia, of scale 1:1,267,200. There are three existing drilled wells, designated as wells A to C on Figure 2, and one dug well (Well D), on the subject property. Records for these wells were not available from the provincial database and only Well D could be accessed during Mr. Hamilton's site visit. From discussions with Mr. Les Cranpton of Quality Water Wells, who carried out the drilling of one or more of the drilled wells, the bedrock is not a productive aquifer in that area. 2.0 GEOLOGY AND HYDROGEOLOGY The subject property lies along the east-facing slope of the Thompson Plateau, at elevations between 450 and 530 m (1500 and 1750 ft). The property consists of a series of bedrock knobs and basins. Three small lakes occupy low points within the basin sediments, and a small ephemeral stream drains eastward from the lake located on the western boundary of the property. No apparent surface drainage exists for the two lakes located within the south-central portion of the property, and these are reportedly saline. W Pacific Hydrology Consultants Ltd.

4 V-Line Construction Ltd. Proof of Water for Proposed Subdivision on Seacrest Hill Northwest of Oliver, B.C. July 5, Page 3 Based on "Late Glacial History and Surficial Deposits of the Okanagan Valley, British Columbia", listed as document 6 in Section 1.O, unconsolidated glacial outwash sediments of variable thickness occupy lowland areas and overlie finer-grained glaciolacustrine sediments. The outwash sediments are characterized as interbedded gravels, sands and silts which were likely deposited during the last stages of glacial retreat. Granitic gneiss, likely of the Okanagan Gneiss Group, is exposed on the upland portions of the property. Table 1 in Appendix B summarizes the lithology encountered in wells to the east of the subject property. Unconsolidated sediments overbed rock range in thickness from 11.3 to greater than 31.7 m (37 to >lo4 ft) within these wells. Regional groundwater flow occurs in both fractured bedrock and permeable valley fill sediments. Groundwater originates as snowmelt and, to a lesser extent, direct infiltration from precipitation in the upland areas. Regional flow is expected to be dominantly through the deeper valley sediments with discharge ultimately to the Okanagan River system to the east. Local groundwater flow occurs in shallow coarser-grained, permeable sediments and receives recharge from direct infiltration of precipitation, as well as from discharge from shallow fractured bedrock. Discharge of local groundwater flow is interpreted to be controlled by the lake-stream systems which occur along the northern, southern and eastern portions of the property. However, the basin morphology, combined with high levels of evapotranspiration, characterisic of the Okanagan Valley, may locally result in little groundwater discharge with such discharge quite highly mineralized. 3.0 GROUNDWATER POTENTIAL The water well summary contained in Table 1 shows four wells in the area of the subject property (Well Nos. 1, 3, 4 and 5) which obtain water from permeable unconsolidated sediments. Depths to water in these wells are reported to range from 3.3 to 11 m (1 1 to 36 ft) with reported well capacities in a range from 1.14 to 3.03 llsec (1 5 to 40 igpm). No information as to the estimated capacity and/or the depth to water in the fifth well (Well No. 2, Figure A - 1) is available. As previously mentioned, no driller's records were available for any of the wells on the subject property. A depth to water of 0.7 m (2.3 ft) below ground in the dug well (Well D on Figure A - 2) was measured on May 18, The full depth of the well is 3.5 m (1 1.5 ft), indicating completion within a shallow, unconfined aquifer. From discussions with Mr. and Mrs. Venables, a capacity of 50 igpm is estimated for this well on a pereminal basis. The drilled wells on the property could not be accessed during the site visit. However, Mr. and Mrs. Venables reported that drilled Well A has a rated capacity of 0.23 Zlsec (3 igpm). The depth required to construct a successful well at any particular location cannot be predicted; however, experience in the area indicates that drilling to a depth as great as 40 m (130 ft) would be a realistic target before abandoning any particular site to drill a second test well. Greatest yield is likely to be obtained from the valley sediments within the northern portion of the property. w Pacific Hydrology Consultants Ltd.

5 V-Line Construction Ltd. Proof of Water for Proposed Subdivision on Seacrest Hill Northwest of Oliver, B.C. July 5, Page 4 Based on the above information, the potential to develop adequate individual domestic sources of groundwater from the unconsolidated sediments is considered to be good and we have confidence in stating that properly constructed drilled wells can obtain the 13.5 llmin (3 igpm) on each of the three lots as required by R.D.O.S. Bylaw 300. While there is always the possibility that any particular well will have inadequate capacity, more than one well could be drilled, if necessary, to encounter favourable aquifer conditions that will permit the development of a well with the required capacity. 4.0 GROUNDWATER QUALITY A basic chemical water analysis was conducted by Analytical Service Laboratories Ltd. (ASL) of Vancouver, for the sample bailed from the dug well (Well D) on the subject property on May 18, "Certificates of Analysis" for this sample are provided in Appendix C. The water from the well is of sodiumlsulphate type and is very hard and highly mineralized (field measured conductivity >1990 pslcm). Groundwater chemistry results were compared with Guidelines for Canadian Drinking Water Quality (GCDWQ). The following parameters exceed the GCDWQ aesthetic objectives: sulphate (1410 mgll) - GCDWQ objective of 500 mgll; sodium (473 mgll) - GCDWQ objective of 200 mgll; hardness (1300 mgll as CaCO,) - GCDWQ objective of 500 mgll; iron (0.42 mg/l) - GCDWQ objective of 0.3 mgll; manganese (0.152) - GCDWQ objective of 0.05 mgll. Levels of sulphate in excess of 500 mg/z may cause short-term laxative effects in consumers, while individuals suffering from hypertension or congestive heart failure may require a sodium-restricted diet. Elevated levels of hardness, iron and manganese may cause taste and odour problems, and can result in encrustation and staining of laundry and plumbing fixtures. Discussions with a water treatment company indicate that treatment of the type of water shown by the ASL analysis is economically feasible using a combined water softenerheverse osmosis system. The estimated cost of treatment for one residence, provided by this water treatment company, is contained in Appendix D. Experience shows that the chemical quality of water from the dug well on the subject V-Line subdivision is typical of groundwater from upland basins in the semi-arid southern B.C. Interior. However, completion of wells within the area bordering the stream along the northern portion of the property may provide groundwater of better quality due to a more active groundwater flow regime in that area. We are not aware of any serious water quality problems in the subject area that cannot be treated and, under the prevailing conditions, we anticipate that groundwater of acceptable quality for domestic consumption can be obtained from either the overburden or fractured bedrock aquifers on the subject property on Seacrest Hill. U Pacific Hydrology Consultants Ltd.

6 V-Line Construction Ltd. Proof of Water for Proposed Subdivision on Seacrest Hill Northwest of Oliver, B.C. July 5, Page 5 In view of the shallow unconfined nature of the valley/basin aquifers, and the history of agricultural use, it is important that all future wells be constructed with care and include a sanitary seal at surface, as well as within the upper portion of the waterline trench for several metres away from the wellhead. In addition, the wellhead area should be landscaped such that precipitation and surface water from snowmelt will flow away from the well casing. Wells should be constructed up-slope from any septic systems, or other suspected sources of contamination, with proper setbacks maintained. 5.0 HYDROGEOLOGICAL IMPACT ASSESSMENT In view of the large lot sizes and permeable nature of the valley/basin aquifers, it is considered that no significant interference will result from normal domestic use of wells completed on each of the three lots within the subject V-Line subdivision. In addition, construction or use of domestic wells on all three lots will have no significant effect on neighbouring wells, the closest of which is located approximately 50+ m (1 605 ft) west of the western property boundary CONCLUSIONS Geologic and hydrogeologic conditions at the proposed V-Line Subdivision of the N.W.?h of Section 30, Township 50, S.D.Y.D., are considered favourable for developing a groundwater source of the required capacity of 13.5 Nmin (3 igpm) on each of the proposed lots to be subdivided from the main parcel; the best aquifer is expected to be the shallow, unconsolidated, permeable sediments located within the northern lowland portion of the property. All indications are that groundwater from the unconsolidated sediments will, with economical treatment, be of acceptable quality for domestic consumption and will satisfy potability requirements of B.C. Ministry of Health. a RECOMMENDATIONS New wells should be constructed within the northern valley portion of the property, while maintaining the proper setback from the small stream occupying the valley. Wells should not be located up-slope or along-slope from septic systems, and property setbacks should be maintained. Wells should not be constructed in areas subject to seasonal flooding. Drilled wells are recommended; each well should be carefully constructed and should include an effective sanitary seal at surface and also within the upper portions of the water line trench for a few meters around the wellhead. The wellhead areas should be landscaped in order to direct snowmelt and surface water away from the well casing. Restriction of activities within a 30 m (100 ft) radius of each well should be enforced, with livestock excluded from this area. w Pacific Hydrology Consultants Ltd.

7 V-Line Construction Ltd. Proof of Water for Proposed Subdivision on Seacrest Hill Northwest of Oliver, B.C. July 5, Page 6 We trust that this letter and attachments will satisfy requirements for Proof of Water for the proposed V- Line Subdivision, as required by Regional District of Okanagan-Similkameen. However, please do not hesitate to contact either of the undersigned if you wish to hrther discuss the contents of this letter or if we can be of further assistance with subdivision approval. Yours truly, PACIFIC HYDROLOGY CONSULTANTS LTD. Todd Hamilton, M.App.Sc. Hydrogeologist Reviewed by Ann Badry, P. Geo. Hydrogeologist/Manager Attachments Pacific Hydrology Consultants Ltd. U

8 i APPENDIX A AREA AND WELL LOCATION MAP AND SITE PLAN

9 Notes: 1. The base map is topographic map N.T.S. 82El5, Keremeos, of scale 1:50,000; contour interval is 100 ft. 2. indicates proposed subdivision. 3. denotes unsurveyed location of a drilled well (see Table 1, Appendix B). PROJECT NO.: V PROJECT: V-LINE CONSTRUCTION SUBDMSION PACIFIC HYDROLOGY CONSULTANTS LTD. \ CONSULTING HYDROGEOLOGISTS AREA AND WELL LOCATION MAP LOCATION: Northwest of Oliver, B.C. DATE: DRAWN BY: FIGURE: 06/27/96 I Qw A- 1 W

10 v NOTES: 1. The base map is after B.C.G.S. water well locotion maps 82E and 82E Countour Interval: 100 ft. LEGEND: + water well - lot boundary / topgraphic contour - stream PACIFIC HYDROLOGY CONSULTANTS LTD. Consulting Hydrogeolgists V- LI N E SUBDl VI SlON SITE PLAN OF PROPOSED SUBDIVISIOb SCALE 1 : V-LINE CONSTRUCTION LTD. PROJECT NO. DATE APPROVED FIGURE V /27/96 2

11 APPENDIX B SUMMARY OF AREA WELLS

12 I I. I&. Table 1. Summary of Details for Drilled Wells in the Area of the Proposed V-Line Subdivision on Seacrest Hill Northwest of Oliver, B.C. Aquifer Materials and Well Completion Driller s Litholog [Tested] or Estimated Capacity 1(i(?)gpm) Remarks unknown 0-12 ft surface till ft till and gravel ft pea gravel ft cobbled hardpan ft layered gravel and silt ft frzctured bedrock diameter well; location - Lot 6, Sect. 25, Twp. 54, L.D. 52, Plan British Columbia Geographic System (B.C.G.S.) W.W. 82E , #3. unknown 0-21 ft gravel ft silt at 60 ft bedrock. unknown Unknown diameter well; location - Lot 6, Sect. 25, Twp. 54, L.D. 52, Plan B.C.G.S. W.W. 82E , #I. ~ unknown 0-9ft surface till 9-28ft brown alluvial cobbled till 28-38ft varve fan ft hardpan ft bedrock diameter well; location - Lot 1, Sect. 25, Twp. 54, L.D. 52, Plan B.C.G.S. W.W. 82E , #3. Screened from 82 to 104 ft. unknown 0-18ft ft blue silt brown ft blue clay ft cobbles gravels ft clay and soil ft clay and soil. 0-5 ft sand and gravel; compact and tight 5-21 ft brown dirty sand ft grey pasty silt ft grey soft clay ft grey firm clay. 15 I 6 diameter well; location - Lot 3, Sect. 25, Twp. 54, L.D. 52, Plan B.C.G.S. W.W. 82E , #4 6 diameter well; location - Lot 3, Sect. 25, Twp. 54, L.D. 52, Plan B.C.G.S. W.W. 82E , #2. Note that W.W. 082E , #1 refers to B.C. Environment Water Well Location MapNo. followed by the well number; the base map is from the British Columbia Geographic System.

13 APPENDIX C GROUNDWATER QUALITY CERTIFICATE AND ESTIMATED COST OF TREATMENT FOR DOMESTIC CONSUMPTION d

14 1,988 Trit,mh Street, Vancouver, B C, Canada V5L 1K5 analytical FAX: (604) TEL: (604) I, 3 service laboratories Itd. CHEMICAL ANWYSIS REPORT Date: June4, 1996 ASL File No. Report On: Report To: Attention: Received: G1324 Water Analysis (V-Line) Pacific Hydrology Consultants Suite Hornby St. Vancouver, BC V6C 3B6 MI. Todd Hamilton May23, 1996 ASL ANALYTICAL SERVICE LABORATORIES LTD. per: Project Ch6mist 'CI Specialist5 in Environnienta Cheniiitry W

15 RESULTS OF ANALYSIS - Water File No. G1324 Dug Well : 00 Dissolved Anions Alkalinity - Total Chloride c1 Fluoride F Sulphate SO4 Nutrients Nitrate Nitrogen Nitrite Nitrogen Total Metals Aluminum Antimony Arsenic Barium Beryllium Bismuth Boron Cadmium Calcium Chromium Cobalt Copper Iron Lead Lithium T-Al T-Sb T-AS T-Ba T-Be T-Bi T-B T-Cd T-Ca T-Cr T-CO T-CU T- Fe T-Pb T- Li Magnesium T-Mg Manganese T-Mn Molybdenum T-Mo Nickel T-Ni Phosphorus T-P Potassium T-K Selenium T-Se Silicon T-Si Silver T-Ag I Sodium T-Na Strontium Tin Titanium Vanadium Zinc T-Sr T-Sn T-Ti T-V T-Zn CaC03 N N <0.2 < < <o. 1 <o.o <o.o 1 <o.o < <0.02 < < <o.o ~0.03 <o.o 1 ~ Results are expressed as milligrams per litre except where noted. < = Less than the detection limit indicated. Page 1 W

16 METHODOLOGY File No. G1324.I - 1 Outlines of the methodologies utilized for the analysis of the samples submitted are as follows: Conventional Parameters in Water These analyses are carried out in accordance with procedures described in "Methods for Chemical Analysis of Water and Wastes" (USEPA), "Manual for the Chemical Analysis of Water, Wastewaters, Sediments and Biological Tissues" (BCMOE), and/or "Standard Methods for the Examination of Water and Wastewater" (APHA). Further details are available on request. Metals in Water 2 I > 2 This analysis is carried out in accordance with procedures described in "Standard Methods for the Examination of Water and Wastewater" 19th Edition 1995 published by the American Public Health Association, and with procedures adapted from "Test Methods for Evaluating Solid Waste" SW-846 published by the United States Environmental Protection Agency (EPA). The procedures may involve preliminary sample treatment by acid digestion or filtration (EPA Method 3005), followed by instrumental analysis by atomic absorption spectrophotometry (EPA Method 7000), inductively coupled plasma - optical emission spectrophotometry (EPA Method 60 lo), and/or inductively coupled plasma - mass spectrometry (EPA Method 6020). End of Report Page 2 w

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