July lst, 1994

Regional District of North Okanagan 9848 Aberdeen Road Vernon, B. C . VIB 2K9

Attention: Mr. Fred Levitt Planner

Dear Sirs:

Reference: Water Supply Evaluation - Proposed Subdivision of Part of the S W 1/4 of Sec. 34, Twp. 14, 0. D. K D. -

The present investigation has been carried out at the request of Mi- to assess the

availability of groundwater as a source of water supply for the proposed subdivision described

herein. It is currently planned to subdivide the property into seven (7) parcels, which will include

six (6) designated lots and a remainder parcel as shown on the subdivision plan (Figure 1). The

proposed source of water supply is shallow groundwater to be obtained from dug water wells.

Our investigation has involved a site inspection, plus an evaluation of pumping test results from

four of the recently completed water wells. In addition, we have conducted a review of available

information including a topographic map, surficial and bedrock geology reports, plus air photos.

Site Description

The property is located on the west side of Commonage Road, a short distance south of the

Predator Ridge Golf Course (see Figure 2). The topographc expression would be described as

valley side with a northwest facing exposure overlooking Okanagan Lake and Ellison Provincial

Kala Groundwater Consulting Ltd.

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PLAh I SUBDIVISION PLAN O F ' - \ A R T OF THE S.W. i/4 1 OF SECTION 34, TOWNSHIP 14, O.D.Y.D. B.C.C.S. No. 82L-013-1-2

Iun lW?. 15"rn 2 m 2%- _ -

LOT 5 7.20 ha

21 xlrr S4JI"

1

4

Park. On a more local basis, the relatively steep valley side topography gives way to a shallow

bench area, which roughly parallels the road easement through the centre of the property.

The surfkial deposits in this area are for the most part comprised of exposed bedrock, with a thin

mantle of colluvium and glacial moraine occurring throughout. The local bedrock is part of a

large granitic pluton of Late Jurassic Age and is comprised of granodiorite, granite, minor gabbro,

diorite and quartz diorite. Rocks of this particular group generally exhibit structural deformation

in the form of joints, fractures shears and cataclastic zones. The younger plutons are usually more

massive. Based on an inspection of air photos, the bench area previously'defined, reflects some

bedrock structural control.

Finally with respect to potential groundwater recharge to the property, there is a spring discharge

area occurring on the remainder parcel (see Figure l), and some small ponds on proposed Lots 1

and 2. West of the property and immediately adjacent to Commonage Road is a small lake

(Howard Lake?), which is slightly elevated with respect to the bench area discussed previously.

Existinp Water Wells

At the present time, four (4) wells have been completed on the property at locations shown on

Figure 1. Water well constructed on Lots 1 and 2 and also the remainder parcel, have been

completed to a total depth of 10 feet with three-foot diameter cement culvert and a gravel

envelop. The well on Lot 6 has been dug to a depth of 10.5 feet and is completed with a two-foot

diameter steel culvert.

In order to provide an assessment of well capacity, pumping tests have been conducted with each

of the four existing wells by Moore's Well and Pump Service of Vernon, B.C. Each test was

conducted for a 24 hour period and involved an initial pump-out phase, pumping the wells at

somewhere between 50 and 100 USgpm to remove water stored within the gravel envelop.

Following the initial phase, the pumping rate was reduced until a steady rate of drawdown was

observed in each well. This rate was then held more or less constant for the remainder of the test.

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A summary of the pumping test results is shown in Table I . Detailed pumping test data along

with semi-log plots of drawdown versus time are attached.

1 2 3 4

TABLE 1

SUMMARY OF PUMPING TEST RESULTS

Remainder 10 ft. 2.65 ft. 15 USgpm 10 Igpm Lot 1 10 ft. 3.42 ft. 5 USgpm 2 Igpm Lot 2 10 ft. 4.13 ft. 4 USgpm 1 Igpm Lot 6 10.5 ft 9.25 ft. 2.5 USgpm 1 IgPm

Conclusions & Recommendations

Based on the results of the present investigation, there is in our opinion an adequate supply of

groundwater available on the property to meet the requirements of a six-lot subdivision. Results

of 24-hour pumping tests conducted with four (4) of the existing wells, indicate a projected

long-term yield of at least 1 Tgpm in each well (see Table 1). Water quality has not been

addressed during the present study and it is therefore recommended that water samples be

obtained for a chemical and bacteriological analysis, and the results reviewed prior to issuing

building permits.

Because of the limited available drawdown in shallow dug wells, extended drought periods will

create a. decline in the water table and subsequently a decrease in well yield. Surface features

Kala Groundwater Consulting Ltd.

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Regional District of North L -.magan Water Supply EvaluationlG. Bransford July 1/94 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

observed during our site reconnaissance, such as the spring discharge area and the small ponds

occurring on Lots 1 and 2, would tend to indicate that there is an adequate source of groundwater

recharge to the property. We would recommend however that water levels be monitored in the

existing wells during the forthcoming summer months and if a significant decline is observed (i.e.

2 to 3 feet - see Table 1) then the wells should be relocated to areas of obvious groundwater

discharge. The water level measurements should be made a prerequisite for each building permit

application.

We trust this meets your present requirements and if there are any questions, please do not

hesitate to contact the undersigned.

Yours truly,

KALA GROUNDWATER CONSULTING LTD. I

LCT/it Encl:

C.C.

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Pumping Test

380 480 600 780 960

1200 1440

Well No. 1 - Remainder Lot

8.63 5.98 8.88 8.65 8.79 6.14 8.92 6.27 8.96 6.31 9.1 5

6.23 Pump rate: 13 USgpm 6.00 Increase to 15 USgpm

6.50 Pump rate: 15 USgpm

I I I I I

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Pumping Test

+ 0) 0 ) .c C .- C

0 U E L E n

0.00

1 .oo

2.00

3.00

4.00

5.00

6.00

7.00

1

Kala Groundwater Consulting Ltd.

Well No. 1 - Remainder Lot

SEMI-LOG PLOT OF DRAWDOWN VERSUS TIME

10 100 Time in minutes

Page 2

1000 10000

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Pumping Test

780 960

1200 1440

Well No. 2 - Lot 1

8.96 5.54 9.1 7 5.75 8.92 9.33 5.91

5.50 Pumping rate: 5 USgpm

I I I I

I I 1

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Pumping Test

3 3.00

L 0 TI

Well No. 2 - Lot 1

I

t I

SEMI-LOG PLOT OF DRAWDOWN VERSUS TIME

e 5.00

e

a e -* e -. w 1 h e

e

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Pumping Test Well No. 3 - Lot 2

1 4.48 0.35 Pumping rate: 100 USgpm 2 4.77 0.64

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Pumping Test

0.00

1 .oo

2.00 c1

.c W W

C

C

0 U

.- g 3.00

E z 4.00

5.00

6.00

1

Kala Groundwater Consulting Ltd.

Well No. 3 - Lot 2

SEMI-LOG PLOT OF DRAWDOWN VERSUS TIME

10 100 Time in minutes

1000 10000

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Pumping Test Well No. 4 - Lot 6

1 9.67 0.42 Pumping rate: 48 USgpm 2 10.13 0.88 3 10.25 1 .oo

64 11.52 2.27 80 11.60 2.35

100 11 -71 2.46 120 11.81 2.56 150 11.81 2.56

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Pumping Test

+ 0 0 y.

C .- C

0 U 3

3 El

0.00

0.50

1 .oo

1.50

2.00

2.50

3.00

3.50

4.00

Well No. 4 - Lot 6

SEMI-LOG PLOT OF DRAWDOWN VERSUS TIME

T I I I I l l l l l I I I I l l 1 1 1 I I I I l l l l l 1 I I I l l l l l

1

Kala Groundwater Consulting Ltd.

10 100

Time in minutes

1000 10000

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Frpm : KRLQ GROUNDWQTER CONSULTING PHONE No. : 604 545 1720 . I

1

Jul. 28 1994 3: 36PM P02

1 . b MLA GROUNDWATER COIVSULTlNC LTIl

#j - 3107A - 31st hve. - Vonon, U.C. - V1T 2G9 I 'I'clcplronclflnx (604) 565-1 720

July 281h, 1994

Rcyional District of Nor-lh Okana~nn 9848 Aberdeen Road Vcrnon, B.C. VIB 2K9

Attention: Mr. Steve Noakes

Dear Sirs:

Rcfcrcncc: Follow-up Watcr Supply Evnluntion - Proposcd Subdivision of Part of the SW 1/4 oFSec. 34, Twp. 14, O.D.Y.

Tlic following is to providc thc rcsults of furt.hcr invcstigalion, which was recently carried oul in conjunction with our walcr supply cvaluation for thc proposcd subdivision described above. The

additional work, which has involved the drilling o f a 120-foot bedrock well, was conductcd at our

requcsl lo:

prove that, in addition io thc cxisting shallow dug wells an the property, therc is othcr

groundwater supply oplions availrible; and, remove water level inonitoring conditions rccornmcnded in our original rcport of July , 1 st,

1994.

Bawd on the results of our original investigation (see report dated July 1, 1994), which centred

on results of pumping tests with four existing dug wells, we concludccl that there is AD adcquatc

supply of groundwater available on the property to incet thc rcquircincnts of a six-lot subdivision,

We did however express thc conccrn that because of the limited available drawdown in the shallow dug wells, cxtcnded drought periods will create a decline in the water table and

subsquently a decretwc in well yield.

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JUL-28-1994 16:19 604 545 1720 95% P. 02

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From : KQLR GROUNDWRTER CONSULTING PHONE NO. : 684 545 1728 Jul .28 1994 3: 36PM P83 - *

In order to alleviate tlicsc concerns, it was rccoinmended ta the developer Chat further

invcstigatlon would be required to cilher (a) determine the availability of water from a deeper

pundwaler source occurring on the proycrty, or @) deterinine thc cxtent of watcr level

fluctuations in the existing dog wclls during the forthcoming sutnmcr months.

Thc dcvcloycr contacted a drilling contractar and on the 22nd of' July, 1994, a 120-fool d e p

bcdrock wcll was drilled (see attached driller's report). Results of thc drilling indicated tbal a

fractured bedrock aquifer is prcscnt on the property and results of preliminary airlift testing

indicated a well yield of20 USgpm from the source.

Based on these results, we are now satisficd that there is an adequate supply of water available on

the property for a six-lot subdivision. partictilarly in view of the fact that a groundwater s\ipply

alternative is avnilablc.

We trust this meets your present requircments and if there are any questions, please do not

licsilatc to contact the undersigned.

Yours truly,

KALA G 0 NDWAI'EH CONSUJ,TWC; LTD.

&w L.C. I$p, P. Geo. Hydrogeologist

LCT/i t End:

C.C.

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JUL-29-1994 16:28 604 545 1720 95z P. a3

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