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Golder Assolciates CONSULTING GEOTECHNICAL A N 0 MlNtN

El841445

A p r i l 1 2 t h ,

B r i t i s h Columbia Hydro

555 West Has t ings S t r ee t and Power Author i ty

Vancouver, B.C. V6B 4T6

ATTENTION: Mr. W.E. Meeks, 1'. Eng.

Re: Hat Creek P r o j e c t Ground Water Hydrogr&s

Dear S i r :

Fu r the r t o ou r let ter of March 14th, 1984, and subsequent te lephone conversat ion, we have prepared a s h o r t f i n a l r e p o r t summarizing the g round water level monitor ing program t o d a t e a t Hat Creek. The r e p o r t i n c l u d e s an assessment of the ground water leve l moni tor ing results and at tached up- dated computer plotted hydrographs.

1.0 INTRODUCTION

ed between 1977 and 1982 was presented i n Golder Associates report e n t i t l e d Assessment of ground water level hydrographs prepared from data gather-

"Hat Creek P r o j e c t G e o t e c h n i c a l a n d H y d r o g e o l o g i c a l U p d a t e , F a l l 1 9 8 2 " , submit ted to B.C. Hydro. Subsequently, a reduced monitor ing schedule was proposed f o r those p iezomet2 .c~ loca ted i n t h e i m m e d i a t e v i c i n i t y of t h e p i t ; the proposed monitoring schedule was d e t a i l e d i n ou r l e t t e r da t ed Feb- ruary 14 th , 1983, reference EI831198. The present report is intended as an

monitoring subsequent ly car r ied out by B.C. Hydro up to January 1984. addendum t o the 1982 report ,and covers t h e r e s u l t s of g round wa te r l eve l

2.0 ASSESSMENT OF GROUND WA'FER LEVEL MONITORING (1982 - 1984) -

those piezometers that have cont inued to show long term changes i n piezome- The following assessment of ground water hydrographs i s concentrated on

t r i c l eve l s . Conc lus ions de r ived from an assessment of short term ground water level f luctuat ions remain unchanged from the 1982 update report .

t he re a r e s t i l l a number of p iezometers tha t have no t s tab i l ized wi th the Examination of t h e individual ground water hydrographs indicates that

i n s i t u ground water pressures. The t a b l e below d e t a i l s t h o s e p i e z o m e t e r s t h a t have recorded t h e g r e a t e s t change i n piezometric level since 1982.

?OLDER ASSOCIATES (WESTERN CANADAj LTD 224 WEST 8TH AVENIJE. VANCOUVER. BRITISH COLUMBIA. CANADA V5Y 1N5 * TELEPHONE 16041 879-9266 * TELEX D4.5088W

* OFFICES IN CANADA * UNITED STATES * UNITED KINGDOM *AUSTRALIA

April. 1984 2 832-1516

Piezometer Number

RH 77-48-1 RH 77-61A-2 RH 77-62-1 RH 77-63-1 RH 78-70-1

DDH 76-141-1 RH 78-75-1

DDH 76-143-1 DDH 76-150-1 DDH 76-161-1 DDH 77-840-1 DDH 78-867-1

Piezometric Level Change

(m)

+1.31 -13.65

+11.36 -14.92

+12.07 +1.21 -1 -30

-11.49 -1.49

-9.55 +9.13(?) -2.97

Lithology

Siltstone (Tcu) Claystone (Tcl)

Claystone (Tcl) Claystone (Tcl)

Coal Siltstone (Tcu)

Siltstone/Sandstone (Tcl) Siltstone/Sandstone (Tcl) Claystone/Sandstone (Tcl) Siltstone/Sandstone (Tcl) Tuffaceous Sandstone Clayey Siltstone (Tcu)

NOTE: Tcl - Coldwater Formation; Tcu - Medicine Creek Formation These piezometers are generally installed in very low permeability

bedrock (hydraulic conductivity less than m/sec). Piezometer RH 77-48-1 however, appears to be completed in more permeable m/sec) siltstone and may be recording higher piezometric levels due to increased precipitation during the monitoring period. The ground water level recorded in piezometer DDH 77-840-1 rose 9.13 m between July 1983 and January 1984. During the previous six years of monitoring, ground water levels in this piezometer fluctuated by approximately 1 m. The recent

rather than increased ground water levels. "rise" in ground water levels is thus attributed to reading inaccuracy

The 1982 update report noted that piezometer DDH 76-150-1, completed within the siltstone, sandstone, conglomerate unit (Tcl) of the Coldwa- ter Formation, was recording an anomolously low piezometric elevation of approximately 795 m (i.e. below the level of Hat Creek). The piezometric elevation appeared to be approaching stabilization some 4 years after carrying out a falling head permeability test. During subsequent moni-

rate of decline and shows no sign of stabilizing. Piezometer RH 77-61A-2, toring, the ground water level in this piezometer has shown an increased

100 m distant from DDH 76- 150-1, is recording declining ground water levels similar to those recorded in DDH 76-150-1. The piezometric eleva-

neighbouring piezometers completed within similar materials [siltstone, tions of these two piezometers are now approximately 6 5 to 75 m below

sandstone, conglomerate (Tcl)], but at different horizons. As indicated in the 1982 update report, it is considered possible that burning of the coal at outcrop within the geological past may have resulted in unload- ing of the underlying material leading to an expansion of the material and decrease in pore water pressure. Due to the low hydraulic conductivity of the bedrock, the reduced piezometric pressures developed on un- loading have not yet come into equilibrium with the neighbouring piezometers set in more permeable parts of the rock sequence.

Golder Associates

II

1

1

m

Apr i l , 1984 3 832-1516

Houth Meadows area responded to the pump t e s t i n g of well PW1 during July The 1982 update repor t ind ica ted tha t a number of piezometers i n the

Meadows area, completed i n l imes tone o r su r f i c i a l depos i t s , showed o n l y 1981. Subsequently, during autumn 1981, some p iezometers in the Houth

a pa r t i a l r ecove ry , while others continued to decline. Subsequent moni-

a f f e c t e d by the pump test d id no t recover fu l ly and have shown a contin- toring during 1983 and early 1984 i n d i c a t e s t h a t a l l of t he p i ezomete r s

water l e v e l s in those piezometers affected (DDH 76-813-1, DDH 77-829-1, u a l d e c l i n e in ground water l e v e l s s i n c e 1982. The d e c l i n e in ground

DDH 77-831-1, DDH 77-834-1, DDH 77-835-1 and DDH 77-835-2) has genera l ly been less than 1 m. The incomplete recovery of these piezometers following pump t e s t i n g r e f l e c t s a slow rate of recharge to both the l imestones and the su r f i c i a l g ranu la r depos i t s . The c o n t i n u i n g d e c l i n e in ground water l e v e l s in the Houth Meadows a rea s ince 1981182 is probably the re- s u l t of removal of ground water f rom s torage associated with the cont i - nued na tu ra l d i scha rge of wel l OW4 and l imi ted na tura l recharge to bo th the l imestone and s u r f i c i a l d e p o s i t s .

As you know, it is Gold 'er Associates intent ion to cont inue reading

que s c i e n t i f i c i n t e r e s t . We w i l l keep you informed of a n y i n t e r e s t i n g some of the piezometers at Itst Creek periodically because of t h e i r uni-

changes.

We hope th i s r epor t p rov ides you with the information you r e q u i r e . Should you have any questionjs, please do not hes i ta te to contac t me.

Yours very truly,

GOLDER ASSOCIATES

G.E. Rawlings, P. Eng.

GER/sek 832-1516

Golder Associates

Golder Associates CONSULTING GEOTECHNICAL AND MINING ENGINEERS

HAT CREEK PROJECT

GROUNI) WATER HYDROGRAPHS

1977 - 1984

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a A p r i l , 1 9 8 4 832-1516

r. GOLDER ASSOCIATES (WESTERN CANADA) LTD * 224 WEST 8TH AVENUIi, VANCOUVER. BRITISH COLUMBIA, CANADA V5Y I N 5 *TELEPHONE (6041 679.9266 * TELEX 04~506800

OFFICES IN CANADA ., UNITED STATES UNiTED KINGDOM *AUSTRALIA

It 1 I II I I I I I L 1 I 1 B 1 I B 1 m

YAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-76-10

7 I 978

LEGENO 3 - PIEZO. NO. i 3 - PIEZO. NO. 2 5 - PIEZO. NO. 3

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MAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-76-11

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if 1984

0 - PIEZO. NO. I LEGEND

0 - PIEZO. NO. 2 A - PIEZO. NO. 3

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VAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-76-12

7 I

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HAT CREEK WATER LEVEL MONITORING - OBSERVATION AELL NO.RH-76-13

7 1978

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0 - PIEZO. 1\10. LEGEND

0 - PIEZO. VO. A - PIELO. NO..

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1 - PIEZ0.UO. I LEGEND

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E i I I I I li m 1 I, m I I I I I I I 1

HAT CREEK WATER LEVEL M O N I T O R I V G - OBSERVATION WELL NO.RH-76-16

I i I Tmtr 1980

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i 1982

~ 1983

3 - PIEZO.NO. I LEGEND

3 - PIEZO. vo. 2 h - PIEZO. NO. 3

I 8 I 8 1 I 1, a I I I I 1 I 1 1 I

Y A T CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-76-18

i i Tmr 7 (I

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1980 I 1982

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0 - PIEZO. h10. I LEGEND

0 - PIEZO. NO. 2 - PIEZO. NO. 3

Y A T CREEK WATER LEVEL MONITORING - OBSERVRTION WELL NO. RH-77-22

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3 1979

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0 - PIEZO. NO. ;

c I II I i I 1 m I a i 4 I t I I 1 I c

MAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-77-25

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1983 ~ 1984

0- PIEZO.UO. I LEGEND

0- PIEZO. NO. 2 A - PIEZO. NO. 3

I I I i I a I 8 I I c 8 8 t 8 1, I I


1 1978 1979 I! '1

I 1984

1 - PIEZO. NO. 1 LEGEND

1 - PIEZO. NO. 2

I a I a 1 I e E 8 I t E a I I I I B B

HAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-77-27

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1 8 1979

1 1982 1983

3 1984

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1978 ~ 1979 ~ 1982

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3 = PIEZO. NO. 1 LEGEND

3 - PIEZO. NO. 2 h - PIEZO. NO. 3

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1979 1980 1981

8 1982

~ 1984

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I - PIEZO. NO. i LEGEND

I- PIEZO. NO. 2 1 - PIEZO.NO. 3

a I e I I I I I I I 4 8 I rl 8 a I I


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0 - PIEZO.NO.2 a - PIEZO. NO. 3

a € I I I I I I 1 I

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1980

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qAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO-RH-77-59

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i 1980 1981 1982 1983

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V A T CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-78-67 0

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3 1979

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YRT CREEK WRTER LEVEL MONITORING - OBSERVFlTION WELL NO.Rt--78-69A

1979 1981

~

1984

0- PIEZO. YO. i LEGEND

0 - PIEZO.YO.2 a - PIEZO. NO. 3

MAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL

t 1979

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~ 1983

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NO. RH-78-70

3 - PIEZO. YO. i LEGEND

3 - PIEZO. Y O . 2

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3 - PIEZO. 1\10. j LEGEND 3 - PIEZO. NO. 5 - PIEZO. NO..

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3

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LEGEND 0 - PIEZO. NO. 0 - PIEZO. "1.

I I I , @ 1 4 , p I 1 I I ilr a I I a, I I

MAT CREEK WflTER LEVEL MONITORING - OBSERVATION WELL NO.RH-78-74

1977 1978

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P c I e I c L a m I I e 4 e c I 1 t

HAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.RH-78-74A

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1981 1983

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HAT CREEK NATER LEVEL ION WELL NO.RH-78-77

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HAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-134

mnm 1978 1979

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1

LEGEND 0- PIEZO.NO. I 0 - PIEZO. NO. 2

e 1 a I t I t i e I II n 4 I a I 1 .i 1

VAT CREEK WRTER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-137

I

~ 1 ~ 1979

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Y

a

I - PIEZO. VO. I LEGEND

:;1 2 7 7

1' n 3

8 I I @ 6 8 I I a I a a a II I a I

YRT CREEK WRTER LEVEL MONITORING - OBSERVRTION WELL NO.ODH-76-141 0 N

0

0

a 0 0

1

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1 I I I t t t I a I 8 a I t I I 8 # e

V A T CREEK WATER LEVEL M O N I T O R I N G - OBSERVATION AELL NO.ODH-76-143

i

3

1 I 3

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1 - PIEZO. r\lO. I

LEGENO

i i 1 1984 1

* 6 1 I I I 8 I e c (I I I 1 t. I I I I

Y R T CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDh-76-144 0

2 m

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w p1 m

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HAT CREEK WATER LEVEL MONITORING - OBSERVATION NELL NO,DDH-76-148 rg

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WIT CREEK inlA'YER LEVEL NONITOPING - OBSERVqTION WELL NO.DDH-76-149

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0 - P!EZO.I.IO. I LEGEND

Q - PIEZO.I.IO.2

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150 WRT 'E

T

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ii LEGEND 0- PIE%O.NO. 1

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1984 l!

HAT CREEK WATER LEVEL MONITORIVG - OBSERVATION WELL NO.DDH-76-155

7- , -mr I !

1981

i "

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0 - PIEZO. '40. I LEGEND

0 - PIEZO. NO. 2

1. c I 8 I I I I 8 t t I m I t I t 8 I

MAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO0!lDH-76-i56

1

o ~ PIEIO. NO. 1 LEGEND

I e m 1 I r I I I I I I f e I I I I a

t w r CREEK WATER LEVEL MONITORING - OBSERVATION WELL N O ~ D D H - X - ~ S ~

~

i 7 7-177

I "

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11

Y

D

I - P!EZO. '40. I LEGEND

8 I 1 I I 1 I m 8 U a 8 a 8 8 1 1. m a

MAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO-DDH-76-160

1979

T

1 1 "

.

f

Kl- PIEZO."IO. I

LEGENU

0 ~ PIEZO. VU. 2

119T CREEK WRTER LEVEL MONITORTVG -

1979

f 1 1980

" I

OBSERVRTION NELL NO.DDH-76-16]

I e I I I t t I I t I a t I I t a,

H A T CREEK WRTER LEVEL MONITORING - OBSERVATION WELL NO. ODH-76-168

I 1979

! 1980

1 - P!ELO. YO. I LEGEND

I I 4 I lr t I I I I 1. I I I a f I E I

i-iST CREEK WRTER LEVEL MONITORING - OBSERVATION NELL NO.!JDH-77-220

A!

1979

1 i 98. 1 r m 2

t r

1 - P!EZO. LEGEND vo. I

i I

c a I I I I I I I a I I 4 I I I I I #

t19T CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-77~-224

-1 ~ 1

' ~ m J

'0

7j

.1 1980 f 1'

g >- m

l iRT CREEK WATEF: LEVEL M O N I T O R I V G - OESERVATION WELL NO.DDH-77-225

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I I )1 y: P

i t

c, 97' 1 3

1 I! 1

I I P I a I I I I I iE I a I I I a 8 f

YRT CREEK WATER LEVEL MON I ' r O R iNG - O B S E R V A T I O N NELL NO. DDH-7'7-226

T 3 - PIE%O.YO. I LEGEND

3 - PIEZO.WO.2

i t t f

nsr I 1 D

I m, I I I 8 m a I a I 8 1 8 I 8 I C I

69T CREEK WRTER LEVEL MON I ' T O R i N G - OBSERVATION NELL NO. DDH-77-227 " 01 '0

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0 7. -+ t-

4-

3 - PIEZO. UO. 2 LEGEND

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I iAT CREEK WFlTER LE'VEL MONITOR ib!G - OBSERVATION NELL NO. DOH-77-230

4

I

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3

D - P!E%O. NO. 1

LEGEND

rt ti rl l! n

1. I I L I I I I I 0 t 8 t I 8 a I I a

IiR'r CREEK WATER LEVEL MONITOR TNG - OBSERVATION WELL NO. DDH-77 -236

i : I!

3 - PIEZO.VO. I LEGEND

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D

L 1 e 8 I i I 1 I I I I I I I I 1 m c

V A T CREEK WRTER LEVEL MONITORING - OBSERVATION dELL NO.DDH-77-239

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I i 1

D - PIEZO. hlo. 1 LEGEND

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1

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HR'T CREEK WRTER LEVEL MONITORTNG - OBSERVATION WELL NO.DDH-77-241

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YAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.!JDH-76-802

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YAT CREEK

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WATER LEVEL MONITORING - OBSERVRTION WELL NO,DDH-76-803

~

1979

~

1980

i 1984

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0 - PIEZO. NO. 2

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YAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-804

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V A T CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-805

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I a a I li a 1 I e I I I 1 I t 1 I 1

HAT CREEK WATER LEVEL MONITORING - OBSERVRTION WELL NO.DDH-76-806

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I 8 I m I I a # 4 I I I a I I I I: a

V A T CREEK WRTER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-807

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V A T CREEK WRTER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-815

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YRT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-76-817

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hAT CREEK WATER LEVEL MONITORING - OBSERVflTION WELL NO.DDH-76-818

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VAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-78-852

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w r r CREEK WATER LEVEL MONITORING - OBSERVATION WELL ~0.~0~-78-853

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VAT CREEK WATER LEVEL MONITORING - OBSERVRTION WELL NO.DDH-78-859 0 f? N

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OBSERVATION WELL NO.DDH-78-860

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MONITORING - OBSERVATION AELL NO.DDH-78-862 VflT CREEK WflTER LEVEL

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VAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-78-863

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Y A T CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.DDH-78-865

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1979

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I iAT CREEK WATER LEVEL MONITORING - OBSERVATION WELL NO.ODH-78-871

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