/ 'e

r)- ,

Water Supply Section Water Management Branch Ministry of Environment 737 Courtney street BUILDINGS V8V 1x5

May 3, 1984

P File: 82 E/14 pf3

Re: Okanagan Mission South Water Users &mnunity - Preliminary Field Survey for Prupcsed Test Drilling Program

Enclosed please find a copy of the report on the above prepared by cur staff. Test drilling is worthvihile a t both sites. Haever, based on available hydrogeologic informtion, he wxld fivour si te "D" over si te "E" as the water level a t this site should be closer to ground surface thus providing mre availale drawdm i n the ~ 1 1 . cxle problem we foresee with the drilling program w i l l be with discharge kcxn the pump test. A discharge line of 2,000 feet or mre for example, may be required to praperly disdharge the mter &am Site "D" to the mrihole near Bellewe Creek. We also understand that the Canmunity trustees w i l l be responsible for acquiring authorization from the City of Keloma or Ministry of Transportation and Highways for drilling a t the si te(s).

If yau have any further questions regarding the above, please do not hesi- tate to contact our office a t 387-1115.

J.C. Fweraker, Head Groundwater Section Water Management Bran& 387-1115

T@A.P. K o h u t Senior Geological Engineer Groundwater Section Water Management Branch

Date: May 1, 1984

File: 82 E/14

Re:

Introduction

Okanagan Mission South Water Users Community - Preliminary Field Survey f o r Proposed Test D r i l l i n g Program

The Okanagan Mission South Water Users Community is considering using groundwater for i r r i g a t i o n and are interested i n two specific areas where tes t wells could be drilled. B o t h sites are located along abandoned stretches of Lakeshore Road right-of-way and were recommended by Kohut (1980) i n a previous office groundwater study done for the Community (s i tes I 'D" and "E" on Figure 1). The irrigation requirements are expected to be up t o 1,100 USgpm. A preliminary field survey was undertaken between Apr i l 17, 1984 and April 19, 1984 by myself and Mr. B. Wilson o f our Ministry's regional s taff to obtain local groundwater and geologic information and inspect the proposed drill sites. This memo summarizes the findings of the survey and makes recommendations f o r the proposed d r i l l i n g program.

We1 1 Inventory and Groundwater Information

Wells and springs located from the survey are shown i n Figure 1. Well log information fo r these wells are summarized i n Table 1. Three of these wells (Gleisner, Schleith, and Thomas wells) were completed into unconsolidated deposits, and provide sufficient quantities for domestic use. The Thomas well has been estimated by the dril ler to yield up to about 100 gpm. The well intake for the drilled wells i s believed to be completed w i t h slotted casing. T h i s construction method may limit well yield; a well constructed i n the same geologic material w i t h a designed screen and properly developed may provide a greater yield.

Water levels measured from the Gleisner and Schleith wells together w i t h the reported water level from the Thomas well were contoured t o form a hydraulic head map. The hydraulic head suggests groundwater to be f lowing i n a north- westerly direction. Water level elevation i n the area apparently ranges between 1,150 feet t o 1,200 feet (Figure 2 ) .

. . . 2

W-372

i I

4 I

- 2 -

A .d Ko hu t May 1, 1984

F i e l d ana lyses were done on pumped water samples from the Gleisner and Thomas wells (Table 1) . Water from the Gleisner well is hard (Hardness = 290 mg/L), has a high methyl orange a l k a l i n i t y va lue (290 mg/L) and moderate dissolved mine ra l i za t ion (Conduct ivi ty = 520pmhos/cm) Water from the Thomas well i s very hard (Hardness = 1,060 mg/L), has a very high methyl orange a l k a l i n i t y value (1,42Q mg/L), high d isso lved mine ra l i za t ion (Conduct iv i ty = 1,68O&mhos/cm), and high t o t a l i ron con ten t (5.0 mg/L). The poor q u a l i t y water i n the Thomas well may be a loca l problem o r may be due to the well tapping deeper, poorer q u a l i t y groundwater. The hardness va lues from both wells suggest the groundwater has the po ten t i a l t o encrust (Ryznar S t a b i l i t y Index from samples of the Gleisner and Thomas wells a r e about 6.2 and 5.1 r e s p e c t i v e l y ) .

Water level information and f ie ld a n a l y s i s obtained from the T r a u t ' s neigh- bour well were not used i n the groundwater i n t e r p r e t a t i o n a s this shallow dug well is believed t o be tapping loca l near-surface groundwater.

Local S u r f i c i a l Geology

Several exposures i n the a rea were inspec ted (F igure 1). Sand and gravel a t E l , E2, E3, and E7 sugges t the bench a rea bounding the south side of Bellevue Creek here is under la in by g l a c i o f l u v i a l sand and gravel and fine- gra ined sand (Figures 1, 2 and 3 and Photos 1 and 2 ) . Si te "D" appears to l i e near the edge of this depos i t . S i l t / c l a y a t E4 and E5 a s well a s the i n t e r l a y e r e d c l a y and sand and gravel a t E6 sugges t t h a t either the g lac io- f l u v i a l deposit c o n s i s t s of a s i l t / c l a y basal u n i t or this lower bench a rea here is underlain by a younger s i l t / c l a y depos i t t h a t abuts upon the o l d e r g l a c i o f l u v i a l depos i t . Gravel ly c l ay found a t the bottom of E2 may support the former theory. No exposures i n the a rea mapped by Nasmith (1962) a s "01 der mixed unconsol idated deposi tsll coul d be examined. However, the Thomas we1 1 which may pene t r a t e i n t o this depos i t r epor t ed ly encountered s e c t i o n s of sand and gravel w i t h gravel t i l l and c l ay (F igu res 2 and 3 ) . S i te "E" appears to l i e upon this depos i t . The kame depos i t mapped by Nasmith (1962) occurs a t h igher e l e v a t i o n s south and sou theas t of the d r i l l s i tes - this a rea was not inspected. The Bellevue Creek f loodp la in depos i t was not inspected b u t i s bel ieved t o c o n s i s t of mostly sand and gravel w i t h some s i 1 t and c l ay .

Proposed Drill Sites

The l o c a t i o n of sites "D" and "E" a r e shown i n F igure 4. Both sites a r e c l e a r of overhead and underground obs t ruc t ions . Si te "D" requires no p r i o r s i t e prepara t ion and is loca ted on the road shoulder . Discharge from the pump test a t this s i te would be along the d i t c h on Lakeshore Road northwards

. . . 3

- 3 -

A .@Kohut May 1, 1984

t o the storm sewer manhole a t Collett Road and Lakeshore Road and then to Bellevue Creek. Parts of the d i t c h have been filled i n w i t h sand and will need to be cleaned out. Another possibility would be to lay a discharge hose ( u p to 2,000 feet long) along the d i t c h to the manhole or west across Lakeshore Road along private property t o Okanagan Lake (Photos 4 , 5 and 6 ) . I t would be desirable t o o b t a i n the Gleisner well as an observation well f o r the pump test to gather aquifer and well interference information. The water level a t si te "D" i s expected t o be roughly 50 feet below ground.

Site "E" would require s i te preparation prior t o d r i l l i n g . The entrances to the s i te is blocked, a t the north end by concrete road blocks and a t the south end by f i l l . The s i te i s located on pavement as there i s no room on the road shoulders for a d r i l l rig. Discharge for the pump test would either be along the Lakeshore Road ditch or west across private property to Okanagan Lake (Photos 7 , 8 and 9 ) . The water level a t s i te "E" is expected t o be roughly 100 feet below ground. Because of lack of hydrogeologic information, the chances of ob ta in ing the required quantities from d r i l l i n g a t either sites are unknown.

Summarv and Recommendations

1. The few drilled wells located from the survey are completed i n t o uncon- solidated deposits and appear t o provide sufficient quantities fo r domestic use. These deposits may be capable of yielding greater quant i - t ies of water t o a properly screened and developed well.

2. Water quality appears to be quite hard. Local problems w i t h iron and Encrustation may be a potential problem for wells sulphur odours exist.

i n this area.

3. Both drill sites are clear of overhead and underground obstructions. However, s i te "E" may require si te preparation work prior t o d r i l l i n g .

4. Discharge for the pump test may be a problem due to the present poor cond i t ion of the Lakeshore Road ditch. A discharge hose up to 2,000 feet or longer may be required.

5. A l t h o u g h the chances of obta in ing the required quantities a t either si tes are presently unknown, i n i t i a l test drilling a t si te "D" i s recom- mended as the water level there is expected to be shallower and conse- quently a thicker section of aquifer may be encountered here t h a n a t s i t e "E". This recommendation does not take i n t o consideration pipeline cost factors, however.

. . . 4

- 4 -

A* Kohut May 1, 1984

References

Kohut, A.P. 1980. Okanagan Mission (South) Water Users Community - Ground- water. Minis t ry o f Environment, Groundwater Section, Victoria, B.C. F i l e 82 E/4.

Nasmith, H. 1962. Late Glacial His tory and S u r f i c i a l Deposi ts of the Okanagan Val ley , British Columbia. British Columbia Department of Mines and Petroleum Resources, Bulletin No. 46.

Mike Wei Geological Engineer Groundwater Sec t ion Water Management Branch 387-1115

MW/dma

'\

3 !I

d

0 4

El

i e9

c 4

..

3 n

\

8 N %'

I ,

\

8 0 \-

I 0

0 a 0 I

F .. 9 2

B 0 % m

0 B

..

I

n

68LL - W3N’

Photo 2. Looking n o r t h a t Exposure 7 - bedded, , f i n e gra ined sand

Photo 3. Looking west a t sp r inq i n Bel levue Creek f l oodp la in - note i r o n s t a i n i n g

I ' I

Photo 4. Looking north-northwest a t proposed s i t e ID'

Photo 5. Drainage d i t c h s lop ing no r th Photo 6. Storm sewer manhole nea r the

d i t c h leading t o t b e manhole i s f i l l e d w i t h sand.

a long Lakeshore Road near junc t ion o f Lakeshore Rd. and - proposed s i t e 'Dl Collet t Rd. Note d ra inage

~~ ~~ ~~

I

Photo 7 . Looking n o r t h e a s t a t 6. k!ilson s tanding on proposed s i t e ' E '

Dhoto 8. Drainage d i t c h s lop ing north nea r proposed s i t e ' E '

Photo 9. Standing a t s i t e ' E ' looking west towards Okanagan Lake. from the pump tes t t o Okanagan Lake.

One p o s s i b i l i t y i s t o d i scha rge the water