(reference fsar figure 2.5-46) the information contained

sEABROOK UPDATED FSAR

APPENDIX 2J

(REFERENCE FSAR FIGURE 2.5-46)

The information contained in this appendix was not revised, but has been extracted from the original FSAR and is provided for historical information.

-·

SAMPLE DESCRIPTIONS

FOR

BORINGS MADE NOVEMBER-DECEMBER, 1972

SEABROOK STATION

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE

Submitted

to

YANKEE ATOMIC ELECTRIC

Project 7286

GEOTECHNICAL ENGINEERS, INC. 934 Main Street

Wino hester, Massachusetts 01890

January 1973

$ GEOTECHNICAL ENGINEERS INC.

PL

q (rec) u

N~TES

NOTATION

water content of split-spoon sample received in the laboratory

plastic limit

equivalent unconfined compressive strength based on penetrometer resistance measured in the laboratory on the split-spoon sample

1. There are no borings corresponding to the following numbers: Dl-2, D2-2, D2-6.

2. Logs of the rock cores are shown on separate sheets.

3. All samples taken with 2-lnch split-spoon sampler.

<t> GEOTECHNICAL ENGINEERS INC.

(: 1'11111111 I-:l!'\':11 ion: 9.8 ft

BORING NO. Dl-1 SOIL DESCRIPTIONS

llc )~\ h f o \\ ··,·,\\· r I .«'~·cr, d1 Jl ft

Snmpll' No.

lA

Ocpth rt

o- OJ

0.5- 2

Number of

mows per 6''

1

2-2-3

Description

Dark brown leaves and root material.

Gray-brown slightly organic silty uniform fine to medium sand.

2 5- 6.5 40-17-39 Brown and red-brown silty gravelly sand. Widely

3 10-11 16-20

graded; contains some fine-sandy silt pockets; grave up to "'-~ 25 mm ln size.

Brown silty gravelly sand. Widely graded; angular to subrounded grains; contains"'-~ 20-30% gravel up to 28 mm in size and ,...., 10-20% nonplastic fines; few gray lenses "-~ 5 mm thick and several rusty-brown spots.

4 15- 16. , 1 0-12-2( Light gray slightly silty and gravelly sand. Fine to coarse grained with a few gravel pieces up to 35 mn ln size; angular to subrounded grains; N 5-10% silt.

ct:> GEOTECII!'<ICAL ENGINI :t:tlS INC

-

c:.·cllllld l·:lt•vaiion: 14.0 ft

BORING NO. Dl-3 SOIL DESCRIPTIONS ..

1;....plh lc ,\':111'1' f.t ·1: ? ( ft Project No. 7286 ~umber

Sample Depth or Blows

per 6" NO. ft

0- 0. 5 1

lA 0.5-1. f 3-4

2 5- 6.5 8-15-2:

3 10-11 43-150

Description

Dark brown fine-sandy organic silt. Nonplastic; contains some roots up to 0.5 mm diameter.

Light brown sand. Fine to medium grained; uniform contains few black organic pieces< 0.5 mm in size; < 5% nonplastic fines.

Brown to rusty-brown sandy silty gravel. Widely graded; angular to subangular grains; contains N 30-40% nonplastic fines and N 20-30% sand; grave pieces up to 25 mm in size. w = 11.2%

Gray silty gravelly sand. Widely graded; angular grains; contains rv ao.:40%gravel up to 30 mm in sizE and N 20-30% slightly cohesvie fines.

¢ GEOTECH:-.;1('..\L E="'GI:--.;Erns 1:'-iC.

11.4 ft


! n, · 11 1 h f, ,-·-'' ._·ll_t'_,._,_,..,.-;...;.' 1.._· _2_0_fl.,..h_o_v_c_g~r_o_u_n_d_s_u_r_fa_c_e ______ --::.1...:., r...:.o..~.:J<...:.~c:.::.· t .... N .. o-.. _'7 ... 2 ... 8 ..... 6...._,

· Number . IS:m1pic Depth

ft of

Blows per 6"

l No. I i

I 0- 0. 5 I

lA 0.5-1. 3-3'

2 5- 6.5 13-8-ll

3 8- 9.5 12-25-51

4 13-13.9 64-87 /5'

5 .5. 4-15. 25/1 "-25/0"

Description

Dark brown decomposed leaves.

Light brown slightly gravelly silty sand. Widely graded; subangular grains; slightly plastic fines; gravel pieces up to N 20 mm in size.

Yellow-brown silty clay. Stiff; orange streaks throughout sample; occasional pockets of orange fine sand; some discoloration on freshly broken surface.

w = 19.9%

Brown slightly clayey gravelly fine sand. Subangulai grains; red-brown fine sand at top of sample; contain gravel uptoN 30 mm in size.

Gray gravelly silty sand. Widely graded; cootains subangular gravel pieces up toN 25 mm in size; slightly plastic fines.

No recovery.

-

-

1 ;r.o~u.d !·:l(•v:tl ion: Hi. 6ft

BORING NO. Dl-5 SOIL DL:SCR~PTIONS

il. 1 .~i: t •• \\·,,•,•r lA .~t~·!~·~2~-~~~f~~~~~~~~~~~~~~~~~~~'r~<~' ~c~c~t~~o~·~7~2~8~6~, I ! js:mlpi<· j Dqlth , No. ; ft 1 i I

I 1

I ii-1.5 I

i

I i 2 I

'

I 3

4

5

!

I 1. 5-3

5- 6.5

110-11.5 I I

I I

14-15.3

'iu1nuer of

Blows per 6" /

I

1-1-2 i

1-2-10

31-33-46

23-52-122

I I !

20-29-100/4"

Description

Top is dark brown leaves and decomposed root materials. Bottom is brown silty sand. Sand is mostly fine-grained with a trace of medimn and coarse grains.

Light brown slightly silty fine sand. Contains few mediu..>n sand grains and gravel pieces up to N 20 mm in size.

Brown slightly gravelly silty sand. Widely graded; subangular to subroooded grains; contains a pocket of weathered quartz; orange-brown staining on freshly broken gravel surfaces.

Brown gravelly silty sand. Widely graded; gravel IS

subangular to subroooded; iron oxide staining on freshly broken surfaces of gravel; gravel pieces range in size up to tv 20 mm.

Top is orange-brown silty fine to medimn sand with a trace of coarse sand. Bottom is gray stratified sand: ciayey silt and Oay. Layers are < 2 mm thick; con-tains some coarse sand and a few gravel pieces up to N 25 mm in size. w = 23.6%

II

( :round I: IP\' at ion~ 19. 2 ft ill'l'lh In \\':11{'1' IA•\2 I· 3 f

~ Number :un pit• D(•pth Of

No. ft nlows per 6''

I o- 1 1- 1 I

lA 1- 1.5 4

i 5- 6.1 2,4-124 .. I 46/1"

2

I

3 0-11.5 l-56-11

BOHING NO. IJl -6 SOIL DESCRIPTIONS

Dcscrtptton

Protect Nn. 72R6

Brown organic silty fine sand With small roots and leaves.

Light brown silty fine sand. Unlfonn; contains a few gravel pieces up to N 15 mm in size.

Light brown and red-brown gr11vclly silty sand Widely graded; some iron staining on weathered gravel pieces up to N 20 mm in eize.

Red-brown silty fine to coarse Hand Generally angular grains; has appearanco of weathered rock.

¢ CJ:crn:Cli!'IJC,\L f;:-..iGINEEHS l">>C.

-

-

-

.(; I'OIIIUI 1·:11'\'allnn: 14.3 ft IJ.I..'!flh, ''•'• \\'atPI' \1• r~·\· 1 2. ft

Snmplc No.

2

3

4

Depth ft

o- 1.5

1.5- 3

Number Of

mows per 6"

l-2-3

2-3-4

5- 6.5 20-26-29

10-11 55-90


Description

Brown sandy organic silt. Contains leaves and roots up to 8 mm diameter; some lighter brown silty sand pockets.

Mottled brown~ gray~ and rusty-brown clayey silt. Very stiff; low plasticity and toughness; w slightly above PL; contains brown and rnsty-brown silty fine sand layers up to 40 mm thick; a few roots up to 2 mm diameter. q (rec) = 2.5 tsf w = 19.0% u

Most of sample is gray angular rock fragments up to 35 mm in size. One layer "' 30 mm thick is brown tc rusty-brown gravelly silty sand. Widely graded; angular grains; contains N 20-30% slightly cohesive fines and gravel up to 10 mm in size.

Brown and rusty-brown silty sandy gravel. Widely graded; angular grains; contains N 30-40% fine to coarse sand and"' 10-20% nonplastic fines; gravel pieces up to 35 mm in size.

5 13-14.5 5-30-55 ( ray sandy silty gravel~ Widely graded; angular grains; contains ,.., 20-25% slightly cohesvie fines and ,.., 10% fine to coarse sand; gravel pieces up to 30 mn in size.

¢ CEOTECII~ICAL E~GIISEEHS IISC.

- n t•omul E It •v at ion: 15. 9 ft

BORING NO. Dl-~ SOIL DESCRIPTIONS

kplh IO \\'ah'l' IA'VC'1: 1.9 ft Prolcct No. 7286

;mn ple No.

Depth ft

0- 1.5

Number Of

mows per 6"

1-1-12

Description

Top is dark brown fine·sandy organic silt containing several roots < 1 mm diameter; Bottom is brown and rusty-brown sandy silt containing many dark brown organic pieces< 0.5 mm in size.

2 5- 6.5 31-40-72 Brown slightly gravelly silty sand. Widely graded;

3 8.5- 9 127

angular to subrounded grains; contains N 30-40% nonplastic fines and N 10-15% gravel up to 35 mm in size; fast reaction tn shaking test.

Gray-brown silty gravelly sand. Widely graded; angular grains; contains N 30-4~ gravel up to 25 mr. in size and ""' 20-30% non plastic fmes.

Q') GEOTECHNICAL ENGINElmS INC.

C rumul l·:h•vntlon: 20.8 ft llt•plh lu \\'alt•t• 1,( I: 2.2

I lumber Hnmp)(' 1 Dl'pth of

Nu. I ft Blows >er 6"

1 o- 1.5 2-2-2

BORING NO, Dl~9 SOIL DJ•;SCIUPTIONS

Dcacrlption

Light brown sllty fine sand.

cp GEOTECll!"ICAL ENGINEERS INC.

Pr()ject No. 'l286

(; l'nuntl 1-:h•val ion: 19.2 ft lt•pfh In \\':11('1' LI'Vt•l: 5~5 r

\:unplc No.

2

3

Depth ft

o- 1.5

1.5- 3

7.5- 8

Number or

Blows per 6"

2-2-3

3-4-5

120


Description

Project No. 72&f.t.

Brown slightly organic sandy silt. Nonplastic; con-tains N 40-50% fine to medium sand and several root up to 1 mm diameter, many decomposed vegetation pieces < 1 mm in size; fast reaction to shaking test.

Brown gravelly silty sand. Widely graded; grains ax angular to subangular; contains rv 20-30% nonplastic fines and I'J 10-20% gravel up to 30 mm in size; fast reaction to shaking test.

Similar to Sample No. 2, but more silty; some gray pockets or layers N 30 mm thick; contains several gray angular rock fragments at bottom.

¢ GEOTECHNICAL ENGINEERS INC.

- (: •·nunc! Eh•vallun~ 13. 8 ft l},•plh lu WalPI' Lt•vPl· 1 2 f

>:nnpl<• No.

ncpth ft

Number Of

Blows per G"

BORING NO, Dl-11 SOIL DESCRIPTIONS

Dcscrtptlon

1 o-2 l-l-4-7 Top is dark brown peat with many roots up to 1 mm diameter. Bottom is brown sand. Fine grained; uniform; contains few black organic pieces < 1 mm in size; < 5% silt.

2 5- 6.5 7-10-12 Light gray silty sand. Fine grained; uniform; very fast reaction to shaking test; contains IV 30-40% nonplastic fines; part of sample is silty gravelly sane containing gravel up to 28 mm in size; angular grain~

3 10-11.5 27-30-44 Gray silty sand. Widely graded; angular to subroun-ded grains ; contains ,..., 25-30% nonplastic fines; few gravel pieces up to 8 mm in size. w. = '1. 5%

<P GEOTECHNICAL ENGINT:ERS INC.

- Ut'olmd 1-:h•\•allun: 23.9 ft llt•pth let .'alt•l· I~ .. ·1: 3.5

I

~umber

S:nnplc 'K>pth of No. rt Dlows

Jer 6"

[


Description

Project No. 72GB_

1 o- 1.5 1-1- 3 Brown and dark brown slightly organic silty gravelly sand. Fine to medium grained; contains many pock-ets of dark brown organic sandy silt, and several roots up to 6 mm diameter; fines are nonplastic; contains several gravel pieces 10-27 mm in size.

2 5- 6.5 17-32-57 Brown gravelly silty sand .. Widely graded; angular t1 subangular grains; contains 1'.1 30-35% nonplastic fine; and N 20-30% gravel up to 30 mm in size; very fast reaction to shaking test.

¢ GEOTECHNICAL RNGINEEHS INC.

- (:1·uund 1-:h•\•:tliun: 21.2 ft ) II t \\'( I. O~ft PI\ " ... t\ ot' t' ~·v .. •~-..

Number ::unplt• I k•pth of

No. ft mows per 6"

1 0- 1.5 2-2-5

2 s ... 6 17-120

BORING NO. 02-1 SOIL DESCRIPTIONS

Dcecrlption

l,rnlect No 7286 .

Brown slightly organic silty sand. 'Fine to medium grained; uniform; contains ,..., 20-30% nonplastic fines and roots up to 1 mm diameter; some black organic pieces < 0.5 mm in size.

Mottled gray, brown, and rusty-brown gravelly silty sand. Widely graded; subangular to subrounded grains; contains N 25-35% nonplastic fines and ,.., 15-25% gravel up to 20 mm in size. w = 10.5o/o

¢ GEOTECI INICAL BNOINBBRS INC.

( i mund 1-:h•vatlnn: 19.4 ft )t>!llh In \\'alPt' Lt'V<~I· :l U tt

;nmplc No.

lA

2

3

Dcpth lt

o- 0.5

0.5- 2

Number of

mows per 6"

3-4-4

5.5-7.5 13-30-29-23

10-11.5 21-28-26

BORING NO. 02-3· SOIL DESCRIPTIONS

Dcecription

Project No. 7286

Brown organic silty fme sand. Contains some leaves at top and few small roots.

Light brown silty fine to medium sand. Contains a few gravel piece6 up to t"oJ 20 mm in size; fines are non plastic.

Light brown slightly gravelly very silty sand; sand is fine to coarse; few coarse gravel pieces are gray; contains some Iron staining at bottom.

Stratified light brown and red-brown and gray silty sand. Contains a few gravel pieces up toN 20 mm In size.

4 15-16.5 38-32-31 Gray slightly gravelly very silty sand. Widely graded; few gravel pieces up to "' 35 mm in size.

5 20-21.5 14-22-31 Similar to Sample No.4, but fines are very slightly plastic.

6 25-25.2 35/3" Similar to Sample No. 4, but fines are slightly plasH

¢ CF.OTE:CHNICAL ENGINEERS INC.

-

.. -

-

(~round l·: It •v at ion: 16. 7 ft lkpf 1 In \\':llt'l' Lr •1· 0.0

S:un pi<• Nu.

1

2

3

4

5

•

D<-pth ft

~umber of

mows per u••

o- 1.5 1-1-3

1. 5- 3 3-6-11

5- 6.5 24-35-3:

10-10.6 ~5-100/1

13-14.5 18-22-2•

llOIUNG NO. 02-4 SOIL DI~RCJUPTIONS

Dcecrlptlon

Project No. 7286

Top is dark brown decomposed roots and leaves. Bottom is red-brown slightly silty fine sand con-taining numerous mica flakes.

Light brown slightly silty gravelly fme sand. Gravel pieces are subangular and range in size up to N 20 m contains numerous mica flakes.

Brown slightly gravully silty fine sand. Contains some medium and coarse sand and few fine gravel pieces; one 25 mm size piece of subrounded quartz at top; occasional pockets of red-brown fine sand.

Gray slightly clayey gravelly sand. Widely graded; gravel pieces are subangular to subrounded.

w=9'.1%

Similar to Sample No. 4; 50 mm size piece of gravel at bottom .

6 15-16.6 20-16-2• Gray moderately clayey gravelly sand. Widely graded; gravel fragments are subangular and range

in size up to N 25 mm.

7 20-21.5 9-27-2' Similar to Sample No.6.

d) Gt-:OTECIINICAL ENGINEERS INC.

- c:t·numl Eh•\':tlion: 16.5 ft .l1•Jlfh h• \\':1h•t' l.c·v<·l: 5.8

-::unpl(• No.

2

Depth ft

Number of

Blows per 6"

0- 1. 5 2-2-4

5- 6.5 7-7-5

BORTNG NO. D2-5 SOIL DESCRIPTIONS

Dcecriptlon

Project No. 7268

Rusty-brown silty sand. Fine grained; uniform; contains tv 10-20% non plastic fines; trace of black organic specks< 0.5 mm in size; some black organic sandy silt and roots at top.

Brown sandy clayey silt. Very stiff; low plasticity; slow reaction to shaking test; friable @ PL; w slightl) above PL; contains,.., 10-15% fine to coarse subangu-lar sand; several rusty-brown weathered gravel pieces up to 8 mm instze. q (reo) • 3.5 tsf w = 17.4% u

¢ GEOTECHNICAL El':GINERRS INC.

-

<;1'n1mtl FIPvation: 16.7 ft lli'Pih lo \\':1h•1' 1.-·vt'l· 1. 5 ft

Ham ph.• Nn.

2

2A

3

lkpth ft

Number or

Blows per G"

0- 1.5 l/12"-2

1.5- 2 3

2- 3 13-12

5- 6.5 13-16-21

BORING NO. D2-7 SOIL DESCRIPTIONS

Description

Prni<!Ct Nn. 7268

Brown leaves and root material; changes to gray-brown organic silty fme sand with layers of brown organic silt.

Brown organic silty fine sand.

Light brown silty fine sand; changing to gravelly silt: fine to coarse sand at bottom.

Light brown and red-brown very silty fine sand. Contains a trace of coarse sand and a few gravel pieces up to N 35 mm in size; some iron staining.

4 10-11.5 40-81-200 Gray gravelly silty sand. Contains angular gravel fragments up to N 30 mm in size; bottom of sample is rock fragments.

5 15-16.5 18-52-4~ Mottled gray and brown gravelly sandy clay. Con-tains some' coarse sand and gravel fragments up to N 35 mm in size. w = 29. 6%

6 19-19.6 100-100/r' Similar to Sample No. 5, but less clayey. w = 11.5%

7 24-24.5 250 Similar to Sample No. 5, but more gravelly. w= 12.4%

II !1

$ GE:OTECH:".'ICAL ENGINEEHS INC.

(;l·omull<h•v:llion~ 28.9ft ll II I \\' t 1 l'P l () :1 <'l' .C'V(' •

'Number 1.\:mlph.~ Derth or

No. ft Blows per G"

BORING NO. El-l SOU. DESCRIPTIONS

Description

No soil samples taken.

(Bedrock at ground surface. )

<t> GEOTECHNICAL ENGI~EEHS INC.

Pre · cct N 7286 ) J • 0.

c.; rutmd I< k\' :ttinn: 21. 4 ft

BOHTNG NO. El-2 SOIL DESCRIPTIONS

_h•plh to \\':11Pt" Lt•VPI· 3.8 ft Project No. 7286

;;unple No.

Df'plh it

o- 1.5

Number of

mows per 6"

3-14-6

Dcecription

Brown and dark brown slightly organic silty sand. Fine to medium grained; contains N 30 mm thick layer of sandy organic silt containing many small roots up to 3 mm diameter; contains a few angular gravel pieces up to 22 mm in size.

2 5- 6.5 19-31-54 Light brown silty sand. Fine to-coarse grained; subangular; contains N 20-25% nonplastic fines; very fast reaction to sha!:ing test; contains a fav gravel up to 35 mm in size; some darker brown spots.

¢ GEOTECHNICAL ENGINEEflS INC.

I

(: •·umul l·:lt·,·:~r Inn: 15. 2 ft

BORING NO. El-3 SOIL DESCRIPTIONS

1\q ol h ln \\'al t' ,, l J'V('II' 0. 3 lt

!-\:un pll• J)(•pth No. ft

1 i 1.5 o-

Number or

Blows per 6"

1-1-1

Dcecription

Brown slightly organic silty sand. Fine to medium grained; contains N 10-20% nonplastic fines; contains a few small roots up to 1 mm diameter and a trace o1 black decomposed vegetation fibers; one ""' 50 mm thick layer at top is black sandy organic silt with small roots.

2 5- 6.5 8-8-7 Light brown sand. Fine to medium grained; uniform; < 5% silt; contains a few black organic specks < 0.5 mm in size.

3 10-11.5 12-12-15 Gray gravelly silty sand. Widely graded; grains are

4

subangular to subrounded; contains N 30-40% slightly cohesive fines andN 10-15% gravel up to 30 mm in size; moderately fast reaction to shaking test.

w=9.8%

15-16.5 7-23-21 f imilar to Sample No. 3. w = 11.4%

¢ GEOTECIINICAL ENGINEEHS INC.

--------------~

- t ; 1'111111111-:lt•\'al ion: 20. 2 ft l~·plh In \\':llt•t' J,(•y(>). 3 • 0

Number ;;IIH p}p Dt•pth of

No. ft mows per 6"

1 o- 1.5 1-1-1

non TNG NO. El -4 SO[ L U ESCIUI'TIONS

ft

Description

No Recovery.

Q) GEOTC:CHNlCAL ENGINBERS INC.

Project No. 7286

-nORTNG NO. El-5

SOIL DESCUIPTJONS

c: r·nund 1-: I"'' allon! 1 G. 0 fl '>t•nlh In H':lh'l' l.c"v~'' Jj,:J ft

.;am pit• No.

2

D<•plh ft

0- .l

1- 2.5

Number of

Blows per 6"

Dcecription

2-3 Brown fine-sandy organic silt with leaves, several roots up to 3 mm diameter.

5-7-10 Brown sand. Fine grained; uniform; contains sever a black organic pieces < 1 mm in size; < 5% nonplastic fmes; contains one 20 mm size gravel piece.

3 5- 6.5 23-55-78 Brown and gray silty gravel. Widely graded; angulal grains; contains tv 3C -40% slightly sandy brown silt between the gray gravel and rock fragments ranging in size up to 28 mm; the brown silt is nonplastic; ver fast reaction to shaking test.

¢ GEOTECHNICAL ENGlNEEHS INC.

BORING NO. EI-6 SOIL DESCRIPTIONS

lkp0r 1ft,\lii•!,H•t' l A''H""l· 1. 3 It Number

.;;nn p1e fkpth of No. ft Blows Description

per 6"

1 o- 1.5 1-2-5 No Recovery. (Pushed gravel )

¢ GEOTECII:-.IICAL E:"JGINI.::EHS INC.

11rolf:ct Nu. 12Rt;

-

-

-

-

(;I"IIIIIHI J·:h•vaflon: }!).!) (t llt•plh lo \\':JIPJ' J.:•v!·!· G 0 f:

.;ml pl<• No.

2

Depth ft

Number of

Blows per G"

o- 2 1-1-7-19

5- 6.6 31-60-74

nOHJNG NO. ]<;2-1 SOIL IJI~SCIUPT!ONS

Description

Proj(!Ct No. 79.~M

Top is brown sandy organic silt containing roots up to 12 mm diameter. Bottom is light brown to gray-brown gravelly silty sand. Widely graded; generally angular grains; contains rv 20-30% nonplastic fines and""" 10-20% gravel up to 18 mm in size; several rusty-brown spots up to 10 mm in size.

Similar to bottom portion of Sample No. 1, but slightly less silty and fewer rusty-brown spots.

$ GEOTECII;"':lCAL ENGINEERS INC.

-

-

BORING NO. E2-2 SOIL DESCRIPTIONS

t:l'nHnd l<lt•\':lllon: 13.7 ft q1 ·_:,~1,\\ \H }}';,•,i,••f,~';",",l. n 1 n

;:un pic No.

Dc:pth ft

Number of

mows per 611

Dcsc rjptlon

Proicct No. 7?Q~

1 o- 1.5 l-2-2 Top is dark brown peat. Highly decomposed; contain! several roots up to 0.5 mm diameter. Bottom is brown sand. Fine grained; uniform; contains< 5% nonplastic fines.

2 5- 6.5 6-7-9 Similar to bottom portion of Sample No.1.

3 10-11.5 18-21-39 Gray silty gravelly sand. Widely graded; angular to

•

subangular grains; contains N 30-40% gravel up to 34 mm in size and N 15-20% nonplastic fmes.

<P GEOTECIINICAL ENGINf.EilS INC.

. A

SEABROOK UPDATED FSAR

APPENDIX 2K

SEISMIC SURVEY

(THIS APPENDIX HAS BEEN EXTRACTED IN ITS ENTIRETY FROM THE SEABROOK STATION PSAR, WHERE IT IS REFERRED TO AS APPENDIX 2E)

The information contained in this appendix was not revised, but has been extracted from the original FSAR and is provided for historical information .

APPENDIX 2E

SEISMIC SURVEYS

Seismic refraction surveys wer e conducted in the following areas:

the plant site; tidal marsh; Hampton Harbor; Hampton State Park-State

Beach; and offshore (to the east of Hampton State Beach) . The purpose

of these reconnaissance, seismic surveys was to determine depths to

bedrock and depths of major seismic overburden discontinuities. The

results of these surveys are summarized as follows:

1. Plant Site Area

The plan of the seismic lines of investigation, in the plant

site area is shown on Figure 2E•L In addition to the previously

stated purpose, Line 20, OOON was extended west to .provide

supplimentary data for the groundwater hydrology study.

lines were extended north for the purpose of exploring the

contact zone between the Newburyport quartz diorite in the

site area and the Merrimack Formation to the north of the

site.

Other

The results of refraction surveys in the plant site area are

shown on Figure 2E-2 (Sheets 1, 2, and 3). In 'general, the

seismic survey showed that hard rock was shallow in the vicinity

of the selected plant location, with dense till along the

north side of the site and less dense till and possible other

overburden materials west of the plant location.

good correlation between seismic and boring data.

There is

-2-

The bedrock velocities measured by surface refraction techniques

ranged between 13,000 and 16,000 ft/sec; this is indicative of

sound bedrock conditions.

Overburden materials can be tentatively identified by their

respective seismic velocities. Velocities for the overburden

materials ranged from 2,000 ft/sec for loose, unconsolidated

overburden materials to 6,500 to 6,800 ft/sec for dense

glacial till. In general, overburden materials with velocities

in excess of 5, 500 ft/sec and in excess of 3, 000 ft/sec

for unsaturated materials are indicative of glacial till.

Velocities below 5,500 ft/sec for saturated overburden

usually indicate a fluvial or marine deposition.

The extension of Line 20,000N west to 76,900E indicates

bedrock in the order of 200 feet deep and the absence of any

potentially important aquifers.

A number of lines were extended northward to investigate a

contact zone; however, Line 78, 750E was the only one over

which a vel0city change from 15,000 ft/sec (Newburyport} to

13,000 ft/sec (Merrimack) was noted. This change was noted

near Station 21,400N. The velocity change was subsequently

confirmed by crosslines, and the contact location confirmed by

borings. Line 80, SOOE had a velocity change between 20, 900N

and 2l,lOON, but it was not as evident as Line 78,750E. Other

lines were either not extended sufficiently to the north or

overburden velocity ordepth variations were such that any

-3-

velocity change could not be definitely ascribed to the

bedrock type.

2. Tidal Marsh Area

The plan map of the seismic lines in the tidal marsh area is

shown on Figure 2E-3. The basic program of investigation

consisted of Line A and Lines 2A,2B, and 2C across the tidal

marsh area with a number of cross lines between. The location

and orientation of the crosslines were determined by depths to

bedrock and the numerous small streams and man-made canals

which crisscrossed the area. Detailed investigations were

made along Browns River (600 series of seismic lines) and then

westward to the site passing north of Hunts Island (Line NS-2

and the 7.00 and 800 series). A detailed plan map of the

seismic lines in this area is shown on Figure 2E-3. The

600 series of seismic lines were operated as a marine refraction

survey. Elevations of the bottom of Browns River were provided

by McKenna. Associates.

The results of the seismic survey in the tidal marsh area are

shown on Figure 2E-4 {Sheets 1 through 10). In general, the

bedrock surface in the tidal marsh is more than 50 feet below

ground surface although a few sharp rises in the bedrock

surface were noted in the vicinity of Browns River, where some

outcrops were noted. Although Boring C-68 encountered refusal

at an elevation of -28 feet, the bedrock surface rises to an

-4-

elevation of -10 feet along Lines 805 and NS-24, about SO to

70 feet northeast of the boring. Another example of the sharp

changes in bedrock depths occurs in the vicinity of Line A

where Boring C-52, 25 feet right of Line A, encountered refusal

at the elevation of -33 feet, while the seismic data along

Lines A and NS-6 indicate that a ridge of shallow rock (approximately

Elevation -18 feet) occurs along or just to the north of

Line A.

The borings showed that the glacial till found along the north

of the site extends into the tidal marsh south of Line A and

as far east as Line A-12. The till is only a few feet in

thickness and, therefore, could not be detected seismically.

Boring data subsequently showed that in some areas the depths

to bedrock were too shallow by as much as S feet. This was

due' to a surface layer of organic material (peat) of about

the same thickness. Organic materials, because of air entrapped

and the overall nature of the material, are not conducive to

good generation or transmission of seismic energy. In a few

areas of the tidal marsh, organic materials were so thick as

to prevent the generation of a recordable seismic signal.

3. Hampton Harbor Area

The results of the fathometer Sutvey which took place during

:-iarch and April 1973 are shown in the form of a bottom contour

-s-

map {Figure 2E-S). The results of the seismic investigations

are shown in the form.of a bedrock contour map {Figure 2£-6).

The contours are based on seismic reflection and seismic

refraction surveys conducted during March and April 1973 and

augmented by the data obtained from a seismic refraction

survey conducted in the fall of 1968. The 1968 data were

obtained in the northern half of the area shown on Figure 2E-6

and mainly consisted of information on the minimum depths to a

bedrock with only a few computed bedrock depths. The track

maps for the 1973 reflection and refraction surveys are shown

on Figures 2E-7 and 2E-8, respectively.

In the southern half of the area the bedrock was found to be

generally shallow and somewhat irregular. The bedrock contour

map in ~s area was based principally on seismic reflection

data, the interpretation of which was confirmed by Boring FlA.

Organic materials which prevented the generation of a good

seismic signal were noted in a few small areas and at the

southern edge of the area of investigation.

The bedrock contour map in the northern half of the area of

investigation is based on a combination of seismic reflection

and refraction data. Glacial till was detected against the

north side of the shallow rock area by the seismic reflection.

... 6-

The till appeared to thin towards the north so that the

till and bedrock could not be distinguished on the seismic

reflection records. Based on Boring F-2 which encountered

14 feet of till above bedrock, the seismic reflection data

were reevaluated and the contours, as shown on Figure 2E-6,

were constructed from the reevaluated reflection data and the

seismic refraction data.

4. State Park - State Beach Area

The location plan of the seismic lines in this area is shown

on Figure 2E-9 and the seismic results are shown on Figure 2E-

10 (Sheets 1, 2, and 3). Two relatively shallow areas in the

bedrock surface were detected in the State Park: one in the

vicinity of Lines SPS and SPB, just north of Boring C-56; the

second, in the vicinity of Lines SP3, SP4, and SPE, just north

of Boring C-66. Boring C-24 confirmed the fact that a depression

in the bedrock surface exists between the two high areas of

rock.

In the State' Beach area, a thin layer of glacial till was

encountered by Boring P-1, but was not detected seismically.

The seismic overburden velocity of 5,500 ft/sec, asdetected

on the more easterly lines of the State Beach area, may be

indicative of a dense sand.

-

-

-7

5. Offshore Area.

The results of the fathometer survey which took place in March

and April 1973 are shown on Figure 2E-1L The bedrock contour

map, Figure 2E-12, was constructed from seismic reflection and

refraction data obtained in March and April 1973, and from a

seismic refraction survey conducted during the fall of 1968.

The track map for the 1973 reflection and refraction surveys

is shown on Figure 2E-13. The 1968 seismic refraction survey

was conducted in an area extending in an east-northeasterly

direction for a distance of about a mile from the Hampton

State Beach.

The contour maps show that much of the ocean bottom offshore

consists of highly irregular bedrock outcrops. A denser

material, possibly glacial till as indicated by the seismic

refraction velocities, was found along the northern and

western sides of the ledge outcrops. Refraction velocities

in the 5, 500 to 5, 700 ft/sec range were found in this area,

while away from the area, velocities generally ranged between

5,100 and 5, 400 ft/sec~ The seismic reflection data showed

both glacial till and bedrock, although in some areas,

reflections were only obtained from the till. In these latter

cases, the refraction data provided the basis for the bedrock

contours. Borinq$P-2 through P-10 conformed to the general

picture shown by the seismic data.

SECTION 2E .1

PLANT SITE AREA FIGURES

\

PUBLIC SERVICE COMPAN"' OF NEW HAMPSHIRE SEABROOK STATION

FINAL SAFETY ANALYSIS REPORT

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PLANT SITE AREA PLAN MAP SEISMIC SURVI!Y

FIG. 2E-1 I SB1 &2

PUBLIC SERVICE COMPANY OF NEW HAMPSHIRE SEABROOK STATION


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'PLANT SITE AReA PAOFit..E SEISMIC SUfWEY

SB_l &2

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fiN~l SAFEl'f fiNAL ~SlS REPORT RG 2E·2 SH 2 \ Sf'!62

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FINAL SAFETY ANAL YS!S REPORT

FIG. 2E·4 S~.4 I 58 1 & 2

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SEABROOK STATION SEISMIC SURIJEV

FI~AL SAFETY ANALYSIS REPORT

FIG2E-4 SH. 5 : S81&2

PUBLIC SERVICE COMPM"f OF NEW HAMPSHIRE SEABROOK STATION


FIG.2E..t

TIDAL MARSH AREA Pf!OFILE SEISMIC SURVEY

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FIG.1E·d SHJ I SBI& 2

PUBLIC SEIM(I lrnPANY 0: NIW lAMPS-III lliYII. MAI&I AI£A fmlLE SEABROOK SfAllCN SEISMIC SlRVEY

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FINAL SAFETY ANALYSIS RE?ORT

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I SEABROOK STATION

FINAL SA~ETY ANALYSIS AEPOAT

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FIG. 2E·IO

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SEISMIC SUR'itY ANAL SAFETY ANAlYSIS REPORT

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SEABROOK STATION BEDROCK CONTOUR MAP

SEISMIC SURVEY FINAL SAFETY ANAL VSIS REPORT

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