ML091330407
| ML091330407 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 11/03/2008 |
| From: | Florida Power & Light Energy Seabrook |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| SBK-L-08172 | |
| Download: ML091330407 (66) | |
Text
SEABROOK UPDATED FSAR APPENDIX 25 SAMPLE DESCRIPTIONS FOR BORINGS MADE IN NOVEMBER-DECEMBER 1972 (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.
A 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 Winohester, Maasachusette 01890 January 1973 CD CEOTECIINICAL ENGINEERS INC.
NOTATION W
water content of split-spoon sample received in the laboratory P L plastic limit qu(W equivalent unconfined compressive strength based on penetrometer resistance measured in the laboratory on the split-spoon sample NJTES 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-inch split-spoon sampler.
BORING NO. Dl-1 n
9.8 l-t
,,..I.
n Cl SOIL DESCRIPTIONS f-c II 1
III,I
,111 I
,rrs,;
\\r.y
,c
..I.,v*
a..,.
Y Number
- nmplc Depth of No.
rt 13lows Doscrlptlon per 6 1
o-0.5 1
Dark brown leaves and root material.
1A 0.5-2 2-2-3 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 graded; contains some fine-sandy silt pockets; grave up tow 25 mm in size.
3 10-11 16-20 Brown silty gravelly sand. Widely graded; angular to subrounded grains; contains N 20-30s gravel up to 28 mm in size and N lo-20% nonplastic fines; few gray lenses N 5 mm thick and several rusty-brown spots.
4 15-16.5 10-12-21 Light gray slightly silty and gravelly sand.
Fine to coarse grained with a few gravel pieces up to 35 mn In size; angular to subrounded grains; N 5-10% silt.
BORING NO. Dl-3 SOIL DESCRIPTIONS A
A 1
IA 2
3
,\\:1lc*r 11 Depth rt o- 0.5 0.5-l.
E 5-6.5 10-11 14.0 it
- I:
2, Vumbcr O f Blows per 6 1
3-4 8-15-2:
43-150 lro&xt No. 7286 1
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 N 30-hO%gravel up to 30 mm in size a n d N 20-30s slightly cohesvie fines.
BORMG NO. Dl-4 SOIL DESCRIPTIONS i
n i
i I1 I
i 1
1A 2
3 4
5
.\\:lIl*r I, Depth ft o- 0.5 1
Dark brown decomposed leaves.
0.5-l. 1 3-3 Light brown slightly gravelly silty sand. Widely graded; subangular grains; slightly plastic fines; gravel pieces up to N 20 mm in size.
5-6.5 13-8-l!
Yellow-brown silty clay. Stiff; orange streaks throughout sample; occasional pockets of orange fine sand; some discoloration on freshly broken surface.
w = 19.9%
8-9.5 13-13.9
.5.4-15.
12-25-51 Brown slightly clayey gravelly fine sand. Subangular grains; red-brown fme sand at top of sample; contain gravel up to N 30 mm in size.
64-8715 Gray gravelly silty sand. Widely graded; cantams subangular gravel pieces up to a 25 mm in size; slightly plastic fines.
25/l-25/O No recovery.
.li 2. 0 fi Number of Blows per W bovc ground surface Iroj(hct No. 7286 Description
nORlN<; NO. IX-5 SOIL IjIZ?CR;PTIONS i
- ii-1.5 j
Ii i 1.5-3 i
I 5-6.5 1
I 10-11.5 1
I i
14-15.3 i
,1 i
I i
t I
1 I
f 1
f t.1 1G. G rt lb!: 2.R it 1
NuinLcr Of I\\lows i
I per G
i I
I Description Iro cd No. 7286 l-l-2 I
)
I I
l-2-10 !
I 31-33-4G 23-52-122 20-2s 100/4" I
I I
I I
I I
I i
i Top is dark brown leaves and decomposed root materials. Bottom is brown siIty sand. Sand is mostly fine-grained with a trace of medium and coarse grains.
Light brown slightly silty fine sand. Contains few medium sand grains and gravel pieces up to N 20 mm in size.
Brown slightly gravelly silty sand. Widely graded; subangular to subrounded 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 subrounded; iron oxide staining on freshly broken surfaces of gravel; gravel pieces range in size up to N 20 mm.
Top is orange-brown silty fine to medium sand with a trace of coarse sand. Bottom is gray stratified sand:
ciayey silt and Clay.
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?&
IIOILING NO. IJI -6 SOIL DESCRIPTIONS
- I111 1)1!
No.
Dqth ft 1
1 o-1 I
1A l-1.5 I
2 I 5-6.1 3
O-11.5 vi:
- 2.
3 Number Of Dlows per 6 2
l - l 4
,4-124-46/l i-56-11 Dcecriptlon Brown organic silty fine aand with small roota and leaves.
Light brown silty fine eand. Uulform; contains a few gravel piece8 up to N 15 mm in size.
Light brown and red-brown gruvclly silty sand.
Widely graded; some iron staiuing on weathered gravel pieces up to N 20 mm in eize.
Red-brown silty fine to coarse Hand. Generally angular grains; ha8 appearance of weathered rock.
RORING NO. Dl-7 SOIL DESCRIPTIONS
,I 1 I.,,.,I.\\
.n I. I, I.Y LC L
Number hln plc Ikpth O f No.
ft I3lows Description per 6 1
o-1.5 l-2-3 Brown sandy organic silt.
Contains leaves and roots up to 8 mm diameter; some lighter brown silty sand pockets.
2 1.5-3 2-3-4 Mottled brown, gray, and rusty-brown clayey silt.
Very atiff; 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.
qu(rec) = 2.5 tsf w = 19.0%
3 5-6.5 20-26-29 Most of sample is gray angular rock fragments up to 35 mm in size.
One layer N 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.
4 10-11 55-90 Brown and rusty-brown silty sandy gravel. Widely graded; angular grains; contains N 30-40s fine to coarse sand and N lo-20% nonplastic fines; gravel pieces up to 35 mm in size.
5 13-14.5 15-30-55 Gray sandy silty gravel, Widely graded; angular grains; contains N 20-25s slightly cohesvie fines and N 10% fine to coarse sand; gravel pieces up to 30 mn in size.
A RORING NO. Dl-8 SOIL DESCRIPTIONS t; 10\\11l(l I~:I(Y:ll ion:
- 15. 9 rt l('I'fh IO \\\\'3f(I IAw~l:
1.9 ft Number Qllll plc Depth Of No.
rt Rlows per 6 Projccf No. 7286 Description 1
o-1.5 1-1-12 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; angular to subrounded grains; contains N 30-40s nonplastic fines and N 10-15s gravel up to 35 mm in size; fast reaction to shaking test.
3 8.5-9 1 2 7 Gray-brown silty gravelly sand. Widely graded; angular grains; contains N 30-46 gravel up to 25 mr in size and N 20-30s nonplastic fines.
1 o - 1. 5 I:
2.2 Jumbcr of Blows
)er 6 2 2 BORING NO, Dl-rS SOIL DIZSC1UPTIONS Dcacrlption Light brown silty fine s.and.
BORING NO. Dl-10 SOIL DESCRIPTIONS n
(; 1v1f1110 I~:lf-v:11 ifm:
19.2 rt h)ltII tcr \\\\:1t(r Irwl: 5-5 fC Number hIpIC Depth Of No.
it Blows per 6 Description Project No. 73.86 1
o-1.5 2-2-3 Brown slightly organic
.sandy silt.
Nonplastic; con-tains N 40-50s 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.
2 1.5-3 3-4-5 Brown gravelly silty sand. Widely graded; grains ax angular to subangular; contains A 20-30% nonplastic fines and N lo-20% gravel up to 30 mm in size; fast reaction to shaking test.
3 7.5-8 1 2 0 Similar to Sample No. 2, but more silty; come gray pockets or layers N 30 mm thick; contains several gray angular rock fragments at bottom.
CL GEOTECHNICAL ENGINEERS INC.
BORING NO, Dl-11 SOIL DESCRIPTIONS
)l11Il Ill \\\\:llcl IAVCI:
1.z it Nutnhcr ht11plc Depth O f No.
rt Blows per G Description 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; c 5% silt.
2 5-6.5 7-10-12 Light gray silty sand.
Fine grained; uniform; very fast reaction to shaking test; contains N 30-40%
nonplastic fines; part of sample is silty gravelly sani containing gravel up to 28 mm in size; angular graim 3
10-11.5 27-30-44 Gray silty sand.
Widely graded; angular to subroun-ded grains
- contains N 25-30s nonplastic fines; few gravel pieces up to 8 mm in size.
w.= 7.5%
0 CEOTECIINICAL ENCINIXRS INC.
DORING NO. Dl-12 SOIL DESCRIPTIONS
,3lCl. Ix wpth rt o-1.5 5-6.5 1:
3.5 Wnbcr of Rlows 3er 6 l-l-3 17-32-57 lrojcct No. 7~
Dcecription Brown and dark brown slightly organic silty gravelIy 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 lo-27 mm in size.
Brown gravelly silty sand.. Widely graded; angular t
subangular grains; contains N 30-358 nonplastic fine; and N 20-30s gravei up to 30 mm in size; very fast reaction to shaking test.
3 GEO1I:CtI.NICAL ENCINI::EtIS INC.
BORING NO. D2-1 SOIL DESCRIPTIONS
\\..*.II.,., \\\\..I,,*.
1.,.,..I.
a!7 ft lroicct No. 7286 Dcecrlption 1
o-1.5 2-2-5 Brown slightly organic silty sand. Fine to medium grained; uniform; contains N 20-30s nonplastic fines and roots up to 1 mm diameter; some black organic pieces < 0.5 mm in size.
2 5-6 17-120 Mottled gray, brown, and rusty-brown gravelly silty eand. Widely graded; subangular to subrounded grains; contain6 N 25-35s nonplastic fines and N 15-25s gravel up to 20 mm in size. w = 10.5%
0 CEOTECI KNICAL ENGINEERS INC.
BORING NO. D2-3 SOIL DESCRIPTIONS 4-V
(;lcNlntl Ilw:llion: 19.4 ft
)cy,th 10 \\\\:Ittl IAVCI: z. 0 tt Number hrnplc Ikpth of No.
zt n1ows per 6 Dcecription 1
o- 0.5 1
Brown organic silty fine sand. Contains some leaves at top and few small roots.
I A 0.5-2 3-4-4 Light brown silty fine to medium sand.
Contains a few gravel piece6 up to N 20 mm in size; fines are nonplastic.
2 5.5-7.5 13-30 Light brown slightly gravelly very silty sand; sand is 2 3 fine to coarse; few coarse gravel pieces are gray; contains some iron staining at bottom.
3 10-11.5 21-28-26 Stratified light brown and red-brown and gray silty sand.
Contains a few gravel pieces up to N 20 mm in size.
4 15-16.5 38-32-31 Gray slightly gravelly very silty sand. Widely graded; few gravel pieces up to N 35 mm in size.
5 20-21.5 14-22-31 Similar to Sample No. 4, but fine6 are very slightly plastic.
6 25-25.2 3513 Similar to Sample No. 4, but fines are slightly plastil l
Q GEOTEC~INICAL ENCINElZFtS INC.
T3ORTNG NO. D2-4
,SOTJ, DII:SC1WIIONS c
I)t*pth rt o-1.5 1.5-3 5-6.5 lo-lo.6 13-14.5 15-16.6 20-21.5
$1.
0.0 uumlwr of n1ows per 6 l-l-3 3-6-11 24-35-3:
z5-100/l 18-22-2d 20-16-24 9-27-2' Dcecrlptlon Top is dark brown decomposed roots and leaves.
Bottom is red-brown slightly silty fine sand con-taining numerous mica flakes.
Light brown slfghtly silty gravelly fine sand.
Gravel pieces are subangular and rnnge in size up to w 20 m contains numerous mica flakes.
Brown slightly gravc;lly 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.
Gray moderately clayey gravelly sand. Widely graded; gravel fragments are subangular and range in size up to N 25 mm.
Similar to Sample No. 6.
0 GEOTECIINICAL ENGINEEFlS INC.
I3ORNG NO. DZ-5 SOIL DESCRIPTIONS
,h~)liIl ((1 \\\\:lt(~i IAVC~I:
5.8 it Number i:m~plc~
Ikpth of No.
ft IMOWS per 6 Dcecriptlon Project No. 7268 1
o - 1.5 2-2-4 Rusty-brown silty sand. Fine grained; uniform; contains N 10-20s nonplastic fines; trace of black organic specks < 0.5 mm in size; some black organic sandy silt and roots at top.
2 5-6.5 7-7-5 Brown sandy clayey silt.
Very stiff; low plasticity; slow reaction to shaking test; friable @I PL; w slight&
above PL; contains h) lo-15% fine to coarse subangu-lar sand; several rusty-brown weathered gravel pieces up to 8 mm in size.
qu(rec) - 3.5 tsf w = 17.4%
GEGTECHNICAL RnGINEI3-S INC.
BORING NO. D2-7 SOIL DESCRIPTIONS A
Description 1
o-1.5 l/12-2 Brown leaves and root material; changes to gray-brown organic silty fine sand with layers of brown organic silt.
2 1.5-2 3
Brown organic silty fine sand.
2A 2-3 13-12 Light brown silty fine sand; changing to gravelly silt:
fine to coarse sand at bottom.
3 5-6.5 13-16-21 Light brown and red-brown very silty fine sand.
Contains a trace of coarse sand and a few gravel pieces up to - 35 mm in size; some iron staining.
4 10-11.5 40-81-20C Gray gravelly silty sand. Contains angular gravel fragments up to - 30 mm in size; bottom of sample is rock fragments.
5 15-16.5 18-52-4 1
Mottled gray and brown gravelly sandy clay.
Con-tains some coarse sand and gravel fragments up to
- 35 mm in size.
w=29.6%
6 19-19.6 100-100/l Similar to Sample No. 5, but less clayey.
w = 11.5%
7 24-24.5 2 5 0 Similar to Sample No. 5, but more gravelly.
w = 12.4%
BORING NO. El-l SOIL DESCRIPTIONS lh~~l11I II) \\\\:II(-r Ixwl:
Number s:lmplc Depth O f No.
ft Blows per 6 Dcecription Project No. 7286 No soil samples taken.
(Bedrock at ground surface. )
0 CEOTECLINICAL ENGINElSlIS INC.
BORING NO. El-2 SOIL DESCRIPTIONS h]lIII lo \\\\:li(sr IlVVI:
3.8 ft Number
~;lmplc Dcpih of No.
rt n1ows per 6 Dcecription lro~jcct No. 7s 1
o-1.5 3-14-6 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 roote 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 toeoarse grained; subangular; contains N 20-2570 nonplastic fines; very fast reaction to shaXng test; contains a few gravel up to 35 mm in size; some darker brown spots.
(;l~1lllllll I~:I~T:It ion: 15. 2 it BORING NO. El-3 SOIL DESCRIPTIONS
\\
1..
,I...,....
I a..... I.
nnnr Number i:llll~~lC' Ikpth Ol No.
ct Blows Dcecription per 6 1
I o-1.5 l - l - l Brown slightly organic silty sand.
Fine to medium grained; contains N 10-20s nonplastic fines; contains a few small roots up to 1 mm diameter and a trace ol black decomposed vegetation fibers; one w 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 subangular to subrounded; contains N 30-40s slightly cohesive fines and-10-15s gravel up to 30 mm in size; moderately fast reaction to shaking test.
w = 9.8%
4 15-16.5 17-23-21 Similar to Sample No. 3.
w = 11.4%
GEOTI:CII,NICAL EINGINLXIL~ INC.
J3OJlJNG NO. El -4 SOI L 1) ESCIWTIONS
( ; llll1ll~l 1~:ItT:lt ion: 20. 2 fl h~,lll to \\\\:1lc*t-lAvc*l: 3. 0 ft Numhcr hill ph-Ihyth Ol No.
ft J3lows per 6 Doecrlption Project No. 7286 1
o-1.5 l - l - l No Recovery.
0 GEOTECIINICAL ENCINLXRS I N C.
RORING NO. El-5 SOIL DESCIUPTIONS
- I
, -111
,.I
,>.I*.
I In I.
I*
1.
1..
..J..-e Number implc*
Dcxpth Of No.
rt n1ows Dcecription per 6 1
o - 1 2-3 Brown fine-sandy organic silt with leaves, several roots up to 3 mm diameter.
2 l-2.5 5-7-10 Brown e-and. Fine grained; uniform; contains severa black organic pieces < 1 mm in size; < 5% nonplastic fines; ccmtatns one 20 mm size gravel piece.
3 5-6.5 23-55-78 Brown and gray silty gravel. Widely graded; angular grains; contains N 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.
T3ORlNG NO. El-6 SOIL DESCRIPTIONS I\\... II. 1..,a*..,....
1 _..... I I
9 cc
- I..!..,.,
L,*.
fi,..x 1
o-1.5 l-2-5 No Recovery.
(Pushed gravel. )
0 CEOII:CIINICAL. I:NGINIxIIS INC.
\\\\.,l,bI I.%\\,,.I.
n ct A
Numbc r I;ll~rplc Ikpth of No.
rt 13lows Description per 6 1
o-2 1-1-7-19 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 N 20-30s nonplastic fines and N 10-20s gravel up to 18 mm in size; several rusty-brown spots up to 10 mm in size.
2 5-6.6 31-60-74 Similar to bottom portion of Sample No. 1, but slightly less silty and fewer rusty-brown spots.
BORING NO. E2-2 SOIL DESCRIPTIONS A
,I
,a I.,
,...a.
,r
. I Lb.
Number hIII}3lC Dq,t h of No.
ft I3lows per 6 Dcscriptton 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 &and.
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 15-20s nonplastic fines.
l CD GI:OTIXXINICAL l:NCINFXI1S INC.
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
. A 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 ZE-1.
In addition to the previously stated purpose, Line 20,OOON was extended west to.provide supplimentary data for the groundwater hydrology study.
Other 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.
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.
There is good correlation between seismic and boring data.
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.
Veldcities below 5,500 ft/sec for saturated overburden usually indicate a fluvial or marine deposition.
The extension of Line 20,OOON 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 velacity change from 15,000 ft/sec (Newburyport) to 13,000 ft/sec (Merrimack) was noted. This change was noted near Station 21,409N.
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 21,10ON, but it was not as evident as Line 78,750E.
Other lines were either not extended sufficiently to the north or overburden velocity or depth variations were such that any 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 crosslines 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 700 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 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 Rrea The results of the fathometer surJey which took place during Xarch and April 1973 are shown in the form of a bottom contour
-s-map (Figure 2E-5).
The results of the seismic investigations are shown in the form.of a bedrock contour map (Figure ZE-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 ZE-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 th+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.
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-l, but was not detected seismically.
The seismic overburden velocity of 5,500 ft/sec, as detected on the more easterly lines of the State Beach area, may be indicative of a dense sand.
- 5.
Offshore aea The results of the fathometer survey which took place in March and April 1973 are shown on Figure ZE-11.
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 di5tance 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.
Boring$P-2 through P-10 conformed to the general picture shown by the seismic data.
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