ML18017A985
| ML18017A985 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 03/20/1980 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML18017A986 | List: |
| References | |
| NUDOCS 8003260301 | |
| Download: ML18017A985 (34) | |
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REGULATORY~FORMATION DISTR IBUT ION SYSTEM (RIDS)
'CCESSION NBR>>8003260301 DOC ~ DATE>> 80/03/20 NOTARIZED:
NO FACIL!50 400 Shearon Harris Nuclear Power Planti Unit ir Carolina 50 001 Shearon Harris Nuclear Power Planti Unit 2i Carolina 50 002 Shearon Harris Nuclear Power Plant>
Unit 3i Carolina AUTH'AME AUTHOR AFFILIATION MCDUFFIEiM,A, Carolina, Power L Light Co.
RECIP ~ NAME RECIPIENT AFFILIATION DENTONiH ~ RE Office of Nuclear Reactor Regulation SUBJECTS Forwards "Main Dam Spillway Features ii2 8 Faults FqiA6/C2$
F5/GpG2pG3iH 3 I ~ !'eologic features 1
L 2 in main dam core trench L spillway are not faults,~
DISTRIBUTION CODE:
B0018 COPIES RECEIVED:LTR f ENCL SIZE:
TITLE: PSAR/FSAR AMDTS and Related Correspondence NOTES'/44. Z5: E/SEX o 'd7 $~$ gfggg g 6 Q~
DOCKET 05000000 05000001 05000402 eoS RECIPIENT ID CODE/NAME ACTION:
COPIES LtTTR EN 1
1 RECIPIENT COPIES L
~ AJAR LA C.CLICE QQ 1
INTERNAL:
1 REG E
09 GEOSCIEN BR 11 MECH ENG BR 13 MATL'NG BR 16 ANALYSIS BR 18 AUX SYS BR 20 I 8
C SYS BR 22 AD SITE. TECH 27 EFFL TRT SYS 29 KIRKWOOD AD PLANT SYS AD SITE ANLYSIS HYDRO~METEOR BR OELD EXTERNAL>> 03 LPDR 30 ACRS 1
3 1
1, 2
1 1
1 1
1 1
1 1
2 1
0 1
1 10 1
02 NRC PDR 08 OPERA L'IC BR 10 QAB 12 STRUC ENG BR 15 REAC SYS BR 17 CORE PERF> BR 19 CONTAIN SYS 21 POWER SYS BR 26 ACCDNT ANLYS 28 RAD ASMT BR AD FOR ENG AD REAC SAFETY DIRECTOR NRR MPA 04 NSIC 1
1 1
1 1
1 1
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1 1
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ENCL'
Carolina Power 8 Light Company March 20, 1980 Mr. Harold Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, D. C.
20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1, 2, 3, AND 4 DOCKET NOS.
50-400$
50-401, 50-402, AND 50-403 GEOLOGIC FEATURES IN THE MAIN DAM CORE TRENCH AND'SPILLWAY
Dear Mr. Denton:
i The attached report provides a final geologic description of Main Dam Spillway Geologic Features 1 and 2, and Faults F4, A6, C2, F5, Group G,
G2, G3, H, and I located between Stations 1+50 and 1+90 of the main dam core trench.
The existence of these geologic features has been previously reported to your staff by telephone and discussed with your staff,representat'ives during site visits (see Table 1 of,,the,,
attached report).
As discussed in the report, Geologic Features 1 and 2 are not faults.
The remaining features occurred prior to the deformation-mineralization process of 225 million years ago.
Therefore, Carolina Power
& Light Company concludes that these geologic features cannot be capable faults as defined by Appendix A to 10CFR100.
Yours very truly, Pgk M. A. McDuffie Senior Vice President Engineering
& Construction RGB/jc (0120)
Attachment cc:
Mr. James P. O'Reilly p&@C, 411 Fayetteville Street
+ P. O. Box 1551 o Raleigh, N. C. 27602
~ b.l 8003260 I
g Jl'
CAROLINA POWER
& LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT MAIN DAM SPILLWAY FEATURES 1, 2
AND FAULTS F4, A6, C2, Fg, G,
G2, G3~
H and I 3/20/80
CAROLINA POMER
& LIGHT COMPANY SHEARON HARRIS NUCLEAR POWER PLANT MAIN DAM SPILLMAY FEATURES 1, 2.
AND FAULTS FP, A6'2, F5, G, G2, G3 H and I 2/21/80
SHEARON HARRIS NUCLEAR POWER PLANT UNITS 1, 2, 3 and 4
A.
GEOLOGICAL REPORT ON FAULT F4 AND ANOMALOUS FEATURES THE MAIN DAM-SPILLWAY This report describes spillway foundation features exposed and previously reported during preliminary excavation in moderately to highly weathered horn-blende mica gneiss between Stations 11+50 and 12+10, 100 to 110 feet east of the spillway centerline.
Further investigation of the three apparent "offsets" reported to CP&L and the NRC on December 20, 1978, revealed that only one of the features is a fault.
It will hereafter be called "Faultg~,
The other two features will be referred to as "Spillway Feature 1" at Station ll+59 and "Spillway Feature 2" at Station 12+02.
The features were first shown to Mr. T. Cardone and Mr. J.
R. Harris of the NRC on January 30, 1979.
Subsequent excavation of the spillway and more extensive cleaning has improved the original exposure.
Mr. Harris inspected the fault and features again on February 15, 1980, after the present investigation was completed.
The location of each feature has been resurveyed, resulting in locations corrected from those reported on December 20, 1978.
Spillway Feature 1 was initially reported at Station 11+70.
Its correct location is 11+59.
Spillway Feature 2 was initially reported to be at Station 12+10.
- However, the correct location is 12+02.
Fault F4, the offset first reported at Station 12+02, is actually located at Station ll+90.
Table 1, entitled "Foundation Features and Faults Discovered to Date", has been revised to show the current status of fault reports for the Main Dam.
TABLE 1 MAIN DAK FOUNDATION FEATURES AND FAULTS DISCOVERED TO DATE Feature/Fault C
De norma tiona1 Feature Schistose Zone Location Spillway Sta 15+41 Conduit Sta 2+55 Report to N R C
Initial Written 9/19/78 10/17/78 12/8/77 '2/15/77 NRC 12/14/77 9/19/78 Fault A Fault Group B
Fault C
Core Trench Sta 3+10 Core Trench Sta 3+10 Core Trench Sta 3+60 11/9/78 11/l6/7 8 11/16/78 11/29/78 11/29/78 1/24/79 12/8/78 12/8/78 12/8/78 Fault Group D
Fault A2 Fault A3 Fault A4 Fault E
Fault F
Core Trench Sta 3+32 Core Trench Sta 3+00 Core Trench Wall Sta 3+40 Core Trench Sta 2+87 Core Trench Sta 2+45 Core Trench Sta 2+03 12/1'/78 12/8/78 1/19/79 11/16/78 1/26/79 1/26/79 1/30/79 1/24/79 1/24/79 3/30/79 1/24/79 3/30/79 3/30/79 3/30/79 12/8/78 12/8/78 1/30/79 4/11/79 12/8/78 1/30/79 1/-30/79 1/30/79 1/30/79 Fault G
Core Trench 1/30/79 Sta 1+97 3/30/79 1/30/79 Fault F2 Core Trench 2/2/79 Sta 2+04 3/30/79 4/ll/79 Gneiss Layer 63 Core Trench 1/30/79
& Schistose Zone 82 Sta 3+60 to 2+90 2/2/79 1/30/79
TABLE 1 (Continued)
HAIN DAM FOUNDATION FEATURES AND FAULTS DISCOVERED TO DATE Feature/Fault Location Report to N R C
Initial Mritten NRC Ins ection Fault A5 Fault F3 Core Trench Sta 2+23 2/12/79 Diversion 4/10/79 Conduit Nest Mall Sta 5+48 3/30/79 6/6/79 4/11/79 4/10/79 Schist Layer Fault F
- 4 Spillway Feature 1
Spillway >~*
Feature 2
Fault A6 Core, Trench 4/18/79 Sta 11+52 Spillway Sta ll+90 12/20/78 Spillway Sta 11+59 12/20/78 Spillway Sta 12+02 12/20/78 Core Trench
'/29/80 1+89 6/6/79 This report This report This report This report 4/17/79 5/23/79 1/30/79 2/15/80 1/30/79 2/15/80 1/30/79 2/15/80 2/15/80 Fault C2 Fault F5 Fault Group G
Fault G2 Core Trench 1+62 Core Trench 1+74 Core Trench 1+87 Core Trench 1+57 1/31/80 1/31/80 1/29/80 1/29/80 This report This report This report This report 2/15/80 2/15/80 2/15/80 2/15/80 Fault G3 Core Trench 1+57-1/29/80 This report 2/15/80 Fault H
Core Trench 1+85 1/29/80 1/29/80 This report This report Fault I Core Trench 1+58 e
Previously reported as spillway offset at Sta 12+02 Previously reported as spillway offset at Sta 11+70
"~* Previously reported as spillway offset at'ta 12+10 2/15/80 2/15/80
SPILLWAY FEATURE 1 AT STATION ll+59 As illustrated in Photo 1, Spillway Feature 1 consists of a mine'ralized joint striking N80 W and dipping 55 NE. It cuts across a small granitic dike or layer which changes shape on its southeast side and has no offset along its C
northwest edge.
The joint terminates against a quartz vein six inches to the southeast of the granitic dike and is crossed by an undisturbed quartz vein two feet to the northwest before terminating 5.5 feet from the granitic dike.
Close inspection of the granitic dike suggests that the irregular contact of the dike is due only to the irregular shape of the dike where it is crossed by the joint, and is not related to any displacement along the joint.
SPILLWAY FEATURE 2 AT STATION 12+02 At this location a folded granitic dike, 18 to 24 inches wide, is cut by a fracture striking N35 E and dipping 62 SE.
The fractuie is filled with quartz and altered dark minerals across the dike.
The dike exhibits an irregular contact along its northern margin, and a more regular contact along the other margin,(see Photo 2) where the fracture terminates, Close inspection of the dike and fracture indicates that the dike is not offset, but rather irregularly shaped throughout its exposed length with a sudden thickening at the location where it is crossed by the joint.
FAULT F4 AT STATION ll+90 This feature has been classified with the "F" group of faults, which were previously exposed and investigated in the Hain Dam core trench, because of
its similar orientation and sense of apparent movement.
Fault F~
is 102 feet east of the spillway centerline.
It strikes N60 E, dips 50 SE, and offsets a granitic dike which is one to three inches wide.
As shown in Photo 3, there are six inches of left lateral strike separation of the dike along the fault.
The fault plane is filled by a 1/8 inch thick vein t
.containing quartz and lesser amounts of feldspar, mica and altered, dark minerals.
The mineralization is readily plucked away when cleaned with an air hose and is not always visible.
The fault terminates within four feet of the dike to the southwest, and is masked by' residual soil horizon to the northeast.
CONCLUSIONS Spillway Features 1 and 2 are not faults.
The apparent offsets initially reported are created by the intersection of joints and suddenly widening granitic dikes.
Even if some movement had occurred along the joints at some stage, Spillway Features 1 and 2, and Fault Fp are not capable faults.
The presence of minerali-zation along the fault plane'and in the joints indicates that these features developed prior to ancient thermal activity.
The most recent deformation/minerali-zation occurred at least 225 million years ago as documented in Attachment B
of the CP&L report of October 17, 1978, to the NRC on "Geological Feature at the Vest Vali. of the Hain Dam Diversion Conduit".
Thus Fault Fp and $pillway Features 1
and 2 cannot be capable faults as that term is defined in Appendix A to 10 CFR e
100.
Also, the short length of the fractures, the small separations
- involved, and the cross-cutting relationship of a non-displaced quartz vein indicates that these features are minor and ancient.
B.
GEOLOGIC REPORT ON'AULTS A6, C2, F5, G, G2, G3~
H and I AT THE MAIN DAM The following report describes small faults (A6, C2, F5, G,
G2, "G3, H and I) which are exposed in the floor of the Main Dam core trench between Stations 1+50 and 1+90..
Figure 3 is a geologic map of the core trench showing the location of the eight faults at a scale of one inch equals five feet.
Numbers i
in the text refer to the location of features on this map.
Fault A6 Fault A6, which trends N40 E and dips 70 SE, offsets an epidote vein (No. 4) at Station 1+89, 25 feet downstream of the dam centerline.
There is 1/2 inch of right lateral strike separation of the epidote vein.
(See Photo 4'.) Fault A6 extends approximately 7 feet southwest to the core trench wall where it intersects an aplite dike (No. 5) in the gneiss without offset and terminates at the core
" trench wall.
To the northeast it is crossed by Fault F without offset and dies out 6 feet away.
Fault C2 Fault C2 is located at Station 1+62, 6.5 feet upstream of the dam centerline.
The fault plane, oriented N15 W and near vertical, exhibits a trace only 7
inches in length.
The fault offsets a small granite pegmatite (No. 16), 3/4 inches with a right lateral sense of movement.
it does not offset an aplite dike (No.
- 17) three inches north of the pegmatite.
(See Photo 5.)
Fault F5 Fault F5 shows 5 inches of left lateral strike separation of an epidote vein (No.
- 11) at Station 1+74, eight feet downstream of the dam centerline.
(See Phot<<
)
The fault plane strikes N65 E to N73 E and is near vertical.
It is crossed without offset by several joints (No.
7 and 9),
and dies out 3.5 feet northeast of the offset and 10 feet southwest of the offset.
Fault Grou G
Fault Group G was first reported on January 30,
- 1979, and was discussed in the 4
"Geologic Reports on Faults A2, A4, A5, E, F, F2 and G of March 15,. 3.979.
At that time it was noted that the fault extended into the uncleared area up from Station 1+90.
- Cleaning, which was resumed in January 1980, revealed additional offsets of an aplite dike. (No.
- 10) at Stations 1'+87 and 1+89.
In this area the fault has bifurcated into two near-vertical, subparallel fault
- traces, one striking N75 E and the other N82 E.
The former shows 14 inches of left lateral strike separation and the lattex shows 3 inches of left lateral strike separation.
The fault is crossed without offset by an epidote vein (No.
11).
The two fault traces terminate to the southwest at Stations 1+66 and 1+82.
(See Fh<<o 7.)
Faults G2 and G3 Faults G2 and G3 consists of two subparallel fault planes which offset a 1/2 inch wide granite pegmatite (No. 6).
The displacement along G2 is located at Station 1+57, 11 feet downstream of the dam centerline.
The fault strikes N69 E, dips 75 SE, and is filled with quartz.
There is one inch of right lateral strike separation of the pegmatite.
The G2 fault plane terminates 20 feet southwest where it intersects the core
. trench wall and dies out 13 feet northeast of the displacement.
- It is crossed
by fault I as well as by several joints (Nos.
7 and 9) which show no offset.
The displacement along G3 is located at Station 1+57, 10.5 feet downstream of the dam centerline.
There is 1 1/4 inches of right lateral'isplacement of the granite pegmatite (No. 6).
The-fault plane strikes N65 E, and dips 81 SE The fault dies out in a short distance in both directions from the offset for S
a total length of 3.5 ft. It is crossed without offset by Fault I.
(See Photo 8.)
Fault H
Fault H strikes N58 and is nearly vertical.
At approximately Station 1+85, 5 feet downstream of the centerline, there, are 2 inches of right lateral strike separation of a 3 inch wide aplite dike (No.
12) and at Station 1+84, 3 feet downstream of the centerline, there are 2.5 inches of right lateral separation of a 1 inch wide aplite dike (No. 13).
Northwest of station 1+84, the fault is filled with epidote (No. 15).
quartz-filled fracture (No. 14).
The fault is crossed without offset by a (See Photo 9.)
Fault I Fault I, which strikes N57 W and dips 82 NE, offsets a granitic pegmatite (No.
- 6) at Station 1+58, 10 feet downstream of the dam centerline.
There is one foot of left lateral strike separation of the pegmatite which was also offset by Faults G
and G3 Fault I does not offset G2 and G3 and is filled with epidote.
To the southeast, Fault I continues into the wall of the core trench and to the northwest it dies out at Station 1+47.
(See Photo 8.)
Conclusions The faults described above cannot be considered capable faults because the last movement took place prior to the most recent mineralizing event.
The
faults involve very small amounts of displacement (14 inches or less).
All of the faults are crossed undisturbed by either aplite dikes, epidote veins, quartz veins or other fractures.
Faults G2, H, and I are mineralized.
As documented Attachment B of the CP&L report of October 17, 1978, to the NRC
~ I entitled "Geological Feature at the Vest Vali of the Main Dam Diversion Conduit," the most recent deformation/mineralization event occurred at least 225 million years ago.
- Thus, these faults formed prior to 225 million years ago and cannot be considered capable faults as the term is defined in Appendix Ato 10 CFR 100.
Residual Soil Top of Slope EXPLANATION KEY TO PLAN GEOLOGIC MAP Q1 Spillway feature 1: joint striking N80W dip-ing 550NE, crossing irregularly shaped granitic dike.
Q2 Spillway feature 2: joint striking N350E, dipping 620SE crossing irregularly shaped granitic layer.
Q3 Quartz vein which crosses feature 1 without offset.
Q4 1-3 inch granitic dike showing 6 inches of left lateral strike separation along fault F4.
Q5 Quartz filledjoints Bottom of slope Bench
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Hornblende Mica Gneiss, moderately to highly weathered.
+
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Grant ttc dhkes and layers moderately to highly weathered E]
Quartz veins orpods 72 Strike and dip ofjoint so Q Fault with relative lateral movement shown with arrows and dip of fault plane. Letteridentifies fault 11+50 11+75 SPILLWAYSTATIONING IN FEET, 12+00 12+18 0
10 SCALE IN FEET 20 THIS DOCUMENT IS DELIVERED IN ACCORDANCE WITH AND IS SUBJECT TO THE PROVISIONS OF SECTION X OF THE CONTRACT BETWEEN CARO-LINA POWER
& LIGHT COMPANY AND EBASCO SERVICES INCORPORATED DATED SEPTEMBER 1, 1970 AS AMENDED.
CAROLINAPOWER 8( LIGHTCOMPANY SHEARON HARRIS NUCLEAR POWER PLANT MAINDAIVISPILLWAY EAST WALLGEOLOGIC PLAN, STATION 11+50 to 12+18 EBASCO SERVICES INCORPORATED NO. DATE REVISION BY CH.
APPROVED SCALE 1" ~ 10' IV. C~x~w~@
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'Oo KEY Epidote vein.
Granite pegmatite Quar z vein or pod.
Epidote vein which shows
/> inch of right lateral strike separation along Fault A6.
Aplite dike which crosses Fault A6 without offset.
"/* jnch granite pegmatite which shows 1 inch of right lateral offset along Fault G2, 1/s inch of right lateral offset along Fault G3, and 1 foot of left lateral offset along Fault I.
Joint crosses Faults G2, G, and F5 without offset.
Aplite dike.
Joint crosses Faults G2, G, and F5 without offset.
Aplite dike which is offset by Fault Group G. There are 14 inches of left lateral offset along a fault plane striking N750E and 3 inches of left lateral offset along a fault plane striking N820E.
I STATION 1+40
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I 1+50 1+60 DOWNSTREAM 1+70 EXPLANATION I
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pi7 Quartz-filled fracture cuts across Fault H without offset.
Fault H is infilled with epidote northwest of this point.
Small granite pegmatite with /4 inches of right lateral offset along Fault C2.
Aplite dike which is not offset by Fault C2.
0 10 SCALE IN FEET Epidote vein with 5 inches of left lateral offset along Fault F5 and no offset along Fault G.
3 inches of right lateral offset of an aplite dike along Fault H.
1 inch wide,aplite dike with 2/s inches of right lateral separation along Fault H.
F Hornblende-mica gneiss i//I l II I' Large quartz pod I
sso OF Fault with relative lateral movementshown with arrows and dip of faultplane. Letteridentifies fault Vein, dikelet, or mineralized fracture Lithologiccontact, dashed where gradational 1+SO 06:,-:..
Joint or fracture "Strike and dip ofjoints Verticaljoints Vertical vem STATION 1+90.
THIS DOCUMENT IS DELIVERED IN ACCORDANCE WITH AND IS SUBJECT TO THE PROVISIONS OF SECTION X OF THE CONTRACT BETWEEN CARO-LINA POWER
& LIGHT COMPANY AND EBASCO SERVICES INCORPORATED DATED SEPTEMBER 1, 1970, AS AMENDED.
CAROLINAPOWER & LIGHTCOMPANY SHEARON HARRIS I'JUCLEAR POWER PLANT IVIA IN DAM PLAN GEOLOGIC MAP STA. 1+40 to STA. 1+90 EBASCO SERVICES INCORPORATED DATE REVISION BY CH.
API'ROVED SCALE 1- ~
5'IV.c sssex g DR.
CH.
DATE Z,Z FIGURE 3
t
minereiaed geest f
~4
(
0'sV PHOTO 1 VIEW LOOKING NORTH SHOWING SPILLWAY FEATURE 1 AT STA.
10+69.
No. SHNPP Maim Dam 2(80-1 6/79
1 t
PHOTO 2 VIEW LOOKING EAST SHOWING SPILLWAY FEATURE 2 AT STA.
'I2+02.
No. SHNPP Main Dam 2/80-2 6/79
609 PHOTO 3 VIEW LOOKING EAST FROM SPILLWAYSTA.
$5+90 SHOWING 6 INCHES OF LEFT LATERALSTRIKE SEPARATION OF A GRANITE DIKE ALONG FAULT F4, No. SHNPP Main Dam 2/80-3
Q f"f28+k
'HOTO 4 FAULT A6, VIEW LOOKING DOWNSTREAM (SOUTHEAST) AT STA.
1+89 SHOWING M INCH OF RIGHT LATERAL OFFSET OF AN EPI-DOTE VEIN ALONG FAULTA6.
No. SHNPP Main Dam 2/804
V I
eplite dike f
I I
)
~OARS pegNI45&
~h I
Tcg PHOTO 5 FAULT Co, VIEW LOOKING UPSTREAM (NORTHWEST) AT STA. 1+62 GRANITEPEGMATITEIS OFFSET% INCHES BY FAULTC2.
No. SHNPP Main Dam 2/80-5 1/31/80
PHOTO 6 FAULT F6, VIEW LOOKING DOWNSTREAM (SOUTHEAST) AT STA.
1+74. PENCILS SHOW 5 INCHES OF LEFT LATERALSTRIKE SEPARATION OF AN EPIQOTE VEIN ALONG FAULT F5 No. SHNPP IVlain Dam 2/80-6 1/31/QQ
I f ) I eplite dike
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)
f tIf A
~
PHOTO 7 FAULT GROUP G, VIEW LOOKING DOWNSTREAM (SOUTHEAST) AT STA. 1+87. UPPER FAULTTRACE SHOWS 14 INCHES OF LEFT LATERAL SEPARATION AND THE LOWER FAULT.TRACE SHOWS 3 INCHES OF OFFSET ALONG A 4 INCH WIDE APLITE DLKE.
No. SHNPP Main Dam 2/80-7 1/29/BO
PHOTO 8 1/31/80 VIEW LOOKING DOWNSTREAM (SOUTHEAST) AT STA. 1+57. FAULTS G2, G3, AND I ALLOFFSET A THIN GRANITE PEGMATITE.
No. SHNPP Main Dam 2/80-9
l j
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I EPJ PHOTO 9
FAULT H, VIEW LOOKING DOWNSTREAM (SOUTHEAST) AT STA.
0+85. FAULTH OFFSETS 2 APLITE DIKES 2N INCHES EACH. A QUARTZ VEIN CROSSES THE FAULTWITHOUTOFFSET.
No. SHNPP Main Dam 2/80-8 I/29/80