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Home My WebLink AboutAPA1390I I I I I I I •• I· ,.\ I I I. I il: I, I I' .• ~ • • • # : ~· • .. • " • • •• :. ' • • • • • SUSITNA HYDROELECTRIC PROJECT 0 INTERNAL REVIEW·BOARD MEETING MEETING NO. 5 NOVEMBER 4; 1982 ACRES AMERICAN INCORPORATED 1000 Liberty Bank Building Main at Court Buffalo~ New York 14202 '" "' ·.-.•. ' I I " I I I· I I :1 I I t I ,, ,f a I ·''I I OBJECTIVE OF 82 SUMMER PROGRAM _:.~:-~' ~ • 1 ' ' ~,-' DAMSITE · WATANA RELICT CHANNEL BORROW AREA D FOG LAKES RELICT CHANNEL . . . ... .. . -. . . . . .-.. . . I I I ,, a •• I I •• I I I I I I t: I' I •• "!!. •• -\, • • ·~ : -BORROW AREA D DEFINE STRATIGRAPHY & EXTENT OF IDENTIFIED UNITS DEFINE GEOHYDROLOGY & PERMAFROST MATERIAL PROPERTIES I •• ' I I I I I I I •• I I I I ,f' 'I I I .I ' . WATANA RELICT CHANNEL DEFINE STRATIGRAPHY IN UPPER 200 FEET FURTHER DEFINE CHANNEL GEOMETRY DEFINE MATERIAL PROPERTIES DEFINE GEOHYDROLOGY DEFINE PERMAFROST CONDITIONS I I t -.·..,.,. I I I I , a· ! I I -·--,- I 'I 'I I t I I ·I t ~. ' . • 4! . • : . ~ . • : .-· •• : . ~ . . • ~ • • • • • • . . • • . ·• . • . • • .• . ....., FOG LAKES RELICT CHANNEL -. -DEFINE CHANNEL GEOMETRY . .. . ~ . '1, I t a~ I I •• I I I ·.• t I I I I I I I I . - DRILLING. SCOPE OF 82-SUMMER PROGRAM -16 BOREHOLES IN BORROW AREA D/RELICT CHANNEL SEISr,IIC REFRACTION SURVEY -22JOOO LF-DAM SITE -16JOOO LF-BORROW AREA D/RELICT CHANNEL· -45JOOO LF-t-06 LAKES GEOLOGIC f~APPING -DAM SITE LOCAL REGIONAL BORRO\~ SITE D E I <" LABORATORY TESTING -ATTERBERG LIMITS· -GRADATIONS -HYDR0f·1ETERS -MOISTURE CONTENTS PRnCTORS --:-:.-::-:.-:-:--::--:-~.:;;;--·: 7'----:::;"''"'-···:---·-_, - . . ,, I I I I I I I I I .... -. I.' I I I I a. I ,I I EXISTING DIVERSION ARRANGEMENT 1. TWO -38' 0 CONCRETE LINED TUNNELS 2. MULTI-LEVEL INTAKES EL 1420 EL 1490 .... ~ . . . . . .. ' . . . • • • ••• ; ~ • • , • • ... ' ••• l 3 ~ LO¥/ER TUNNEL REDUCES WATER LEVEL IN COFFERDA~1 FOR CONSTRUCTION IN STANDING WATER, 4. LOWER TUNNEL AT DO~INSTREAM TO BE USED AS TAILRACE 5. HIGHER TUNNEL REQUIRED FOR FLOOD ONLY 6e HIGHER TUNNEL USED FOR LOW LEVEL RELEASE -~1UST BE HIGH TO AVOID SILTING 7, LOWER TUNNEL IS PRESSURE TUNNEL. 8, CLOSURE STRUCTURES REQUIRED TO ENABLE PLUG AND LOW WATER RELEASE TO BE CONSTRUCTED. · 9. LOCATION OF TUNNELS SET BETWEEN COFFERDAf~ AND "THE FINS" STRUCTUREl I I I I I I I I I I I I -~ I I I I I I I ALTERNATIVE TO LOCATION OF UPSTREAM DIVERSION PORTAL l, LEAVE AT PRESENT LOCATION 2. LEAVE AT PRESENT LOCATION WITH MODIFICATIONS ·- 3. LOCATE UPSTREAM OF "THE FINS'' 4. LOCATE FURTHER DOWNSTRE~1 So LOCATE ON SOUTH ABUTMENT ... ~ • • " • :· 1}, ,. • • "":"' -• • • • • • • • : :. • • .. • • • • • • -.. ~· • : • ~ - I I I I I I I I I I I I •• I I 1 I I I .... LEAVE AT PRESENT LOCATION ADVANTAGES 1. EXCAVATED ROCK CAN BE USED IN COFFERDAM CONSTRUCTION 2. GOOD HYDRAULIC LOCATION 3. REMOVED FROM NAIN CONSTRUCTION AREA DISADVANTAGES l, REQUIRES 300-FOOT HIGH CUTS 2. EXTENSIVE ROCK SUPPORT MAY BE REQUIRED 3. REQU I RES COMPLEX CONSTRUCT I ON COFFERDA~1 ARRANGE~lENT 4. DIFFICULT ACCESS PROBLEMS I I I I I I :1 I I I t I I I I I I I ·I PRESENT POSITION WITH MODIFICATIONS MODIFICATIONS 1. SEPARATE PORTALS AND STAGGERED CUT FACES 2. MOVE CUT FACES NEARER TO RIVER 3, REVERSE TUNNELS -MAKING LOWER TUNNEL ON SOUTH SIDE ~10D IF I CATION #1 ADVANTAGES -MINIMIZES SIDE ROCK CUTS -:INCREASES WORK AREA ~ DISADVANTAGES -LESS EXCAVATED MATERIAL FOR COFFERDAM -INCREASES DIFFICULTY IN ACCESS TO NORTH TUNNEL MODIFICATION #2 ADVANTAGES -MINIMIZES ROCK CUTS -IMPROVES CONSTRUCTION SCHEDULE -BETTER CONSTRUCTION ACCESS DISADVANTAGES -REQUIRES LARGER CONSTRUCTION COFFERDAM AND GREATER RIVER CONSTRAINTS -LESS EXCAVATED MATERIAL FOR COFFERDfu~ MODIFICATION #3 ADVANTAGES -LESS CONSTRUCTION PROBLEM FOR BOTH PORTALS.· -REDUCES ROCK CUTS DISADVANTAGES -REDESIGN OF TAILRACE THAT COULD RESULT IN LOSS OF ENERGY AND/OR LARGER TAILRACE TUNNELS -CONSTRUCTION PROBLErt1S IN DONNSTREAM PORTAL I I i I I I I I I I I I I a I I I I I PORTAL MOVED UPSTREAM ADVANTAGES -PORTAL WOULD BE ON FLATTER SLOPES -REMOVES DIVERSION AS UPSTREAM CONSTRAINT ON DAM -f~OVES DIVERSION CONSTRUCTION A\~AY FROM MAIN DAf~ -INCREASED WOHK AREA DISADVANTAGES -LENGTH OF TUNNEL -LARGER DIAMETER TUNNEL -POTENTIAL .POOR GEOLOGY IN PORTAL AREA -REQUIRES EXCAVATION THRU "THE FINS'/ POSSIBLE OVERBURDEN PROBLEM -DIFFICULT ACCESS -POORER TUNNEL ALIGNMENT -IMPACTS CONSTRUCTION SCHEDULE I I I I I I I I I I I I I I I I I I I DOWNSTREAM PORTAL ADVANTAGES -BETTER ROCK CUTS -SHORTER TUNNEL BETTER GEOLOGY -EASIER ACCESS DISADVANTAGES -POOR HYDRAULIC ALIGNMENT INTERFERES WITH COFFERDAM -REQUIRES THAT COFFERDAM COR PART OF) BE INCLUDED IN MAIN DAM OR, -REQUIRES FANCY INTAKE DESIGN -PORTAL ALIGNMENT NOT AS FAVORABLE FOR GEOLOGY -MAY INTERFERE vliTH ~1AIN DAM CONSTRUCTION -MAY REQUIRE UNDERWATER CHANNEL CUT I I I I I I I I I I I I I I I 1 I I ., . ~ ' ~. . . ' . .:: ' . . . .. . •• 4 • • • • • • h -.J PORTAL ON SOUTH ABUTMENT ADVANTAGES -SEPARATED FROM ALL OTHER CONSTRUCTION ACTIVITIES NO LEAKAGE CONCERN TO UNDERGROUND STRUCTURES -RELIEVES DIS PORTAL AND DOWNSTREAM COFFERDAM CONJESTION DISADVANTAGES LONG TUNNEL -POOR GEOLOGY J -POTENTIAL PERMAFROST -ACCESS REQUIRES BRIDGE -IMPACTS CONSTRUCTION SCHEDULE -LARGE ROCK CUTS AT U/S PORTAL -POOR HYDRAULICS -POTENTIAL IMPACT WITH COFFERDAt~ CONSTRUCTION -REQUIRES ADDITIONAL TAILRACE TUNNEL . . . i .: . : ~ .. . ... . .. . ' .: . .. . . ~ . : . . . . . . ·. . " :': .. . • ~ ··. .. . ·. . . ~ . . ... . • .. • . . : . . . :-... · ... ·: :: . . . . •. . : . . . . · .. , . .. . . ~ ·. ; . I , ..... ,"'_ ,, I I I I I I ~.- 1 I I I- I I I 1 I I I WATANA RELICT CHANNEL CONCERNS POTENTIAL RESERVOIR LEAKAGE POTENTIAL PIPING POTENTIAL LIQUEFACTION . POTENTIAL SETTLEMENT DUE TO SATURATION AND PERMAFROST THAWING . /. I I I 1' .. f I I I I I I I I I I I I I I I DA~1SITE WINTER GEOTECHNICAL PROGRAM OBJECTIVES OBTAIN DESIGN LEVEL DATA TO FINALIZE GENERAL ARRANGEMENT TO ESTABLISH CONSTRUCTION COSTS AND SCHEDULES DATA TO BE OBTAINED: -ENGINEERING PROPERTIES OF BEDROCK & ALLUVIU~1 -THICKNESS OF ALLUVIUM -DAMSITE GEOLOGY -GEOHYDROLOGY " SCOPE APPROXIMATELY 2000-LF HAMMER DRILLING . -COFFERDAM -MAIN DAr~ -DOWNSTREAM COFFERDAM -U/S PORTAL -PLUNGE POOL APPROXIMATELY 15JOOO-LF SEISMIC REFRACTION SURVEYS -U/S COFFERDAM -MAIN DAM -DIS COFFERDAM -U/S PORTAL -PLUNGE POOL I I I I I I I I I I I I I I I I I I 1- WINTER GEOTECHNICAL · PROGRAM RELICT CHANNEL/BORROW AREA D OBJECTIVES SCOPE OBTAIN DESIGN LEVEL DATA TO DETER~1INE ENGINEERING AND DESIGN REQUIREMENTS AND TO DETERMINE CONSTRUC- TION COSTS AND SCHEDULE. -DRILLING APPROXIMATELY 4.~300-LF BY HAMMER DRILLING INSTALL PIEZOMETERS AND THERMISTORS -INSTALL HELLS -PERFORM FIELD PERMEABILITY TESTING I I I I I I I I I I I I I I I I I 'I ·I OBJECTIVE SUMMER 1983 GEOTECHNICAL · PROGRAM TO CONTINUE IN OBTAINING DESIGN LEVEL DATA SCOPE TECHNIQUES TO BE CONSIDERED: MAPPING -REMOTE SENSING -DRILLING PLUG/PROBE CORING <VERTICAL TO HORIZONTAL) OVERBURDEN SAMPLING -EXCAVATION TEST TRENCHING TEST PIT/BLAST CAISSON/SHAFT ADIT -SURFACE GEOPHYSICS SEISMIC REFRACTION SEISMIC REFLECTION .RESISTIVITY RADAR ETC. -DOWNI-IOLE INSTRUMENTATION THERMAL PIEZOMETRIC DEFORMATION I I I I I I I I I I I I I I I I - I I I -DOWNHOLE TESTING PERMEABILITY SEISMIC VELOCITY If~AGERY ~· DENSITY /MO !STURE MODULUS HARDNESS IN-SITU STRESS INCLINATION DEFORMATION -MATERIAL TESTING ROUTINE SOIL & ROCK TESTING DYNAMIC TESTING CONCRETE TESTING . Ia I I I I - I I I I I I I I I I I I I I DAMSITE -· FXTFNDED GEOLOGIC fi1APP I NG • CONFIRM & REFINE GEOLOGIC INTERPRETATION DETERMINE ROCK CONDITIONS & OVERBURDEN DEPTH BENEATH PROPOSED MAJOR CIVIL STRUCTURES ._ I I I I I I J. ,J I I I I :a I I I I I I -_L -- UNIT STRATIGRAPHIC COLUMN WATANA RELICT CHANNEL AND BORROW SITE D AREA TYPE EVENT SURFICIAL DEPOSITS EROSION a FROST HEAVING COLUMN @ ICE DISiNTEGRATION ABLATION a MELTING ~--~--------------~~-----ADVANCE--------~~~~~~~~~ @~ALLU~~ _ _ INTERGLACIA..:_ ___ ./ @ LACUSTRINE PONDING LAKES INTERGLACIAL ~---4----------------~---------RETREAT-------J BASAL TILL ® OUTWASH ._--+------- ® ® ·ouTWASH GLACIOLACUSTRINE a WATERLAIN TILL C§J BASAL TILL @ ALLUVIUM ·([) OUTWASH {TILL ?) LACUSTRINE 8/0R ~ STRATIFIED DEPOSITS Q) TILL ® ALLUVIUM <@) BEDROCK ADVANCE MELTING f..\ RETREAT RETREAT LAJ<ES a FLOATING ICE ---BASAL MELTING-~ ADVANCE. INTERGLACIAL RETREAT READVANCE MELTING a RETREAT RETREAT MELTING ·ADVANCE FLOWING WATER ---------""*-·"'- --·--·----------··-·~----.. ;,-·--··-·--··-· .. BORROW SITE 0 RELICT CHANNEL ---- ~ I ~ t i ~ i ~-~-l ., ..... IU22•t'OO \ } ~ ... ' •,{ \ 1 •• ' I ., ' \ I" • "~,. \ -.. \ l»oo-AaB ~ l §l I ~ I I ~ ) '..f\., - '\. .. ·~ - ·~ #l ~i • I .I --- ' ~ it g §! ~ i'l :.f .. , .. "'' ... k'i I ! I 4?'1 ?~QoJ I . ( I - - --- lCCATIOH MAP ~ '4 • llllLCS tat.!.•-. • ==::a • ,,on ,,DO-'II at;JIJ JG;'tt • yllf' ·' LEOENO ::::-: =-~~~~~SOnt:t; 1UI'OIIW'OIY, COI!TOUII~llft~ ~HEf -.._ I'OUNJIAl. Clt.l.>!!lfl:. l·~ "t.-lGV.tii6PIIOft~t Oil CRCXS·~CI-~~tl014l$lf NOTU lANDI! . FIGURE 6.3! l -.,. --i--'-----. I I I • I d r t: l f . . ' . l l ' lr I . .Ia.. __ _ ....... ~·~-- ' -N- ~ EXPLORATION MAP FIGURE t !iil-1~ .. •,, . l . ' .. "" ' .... . ~ -.... ' f. • • .. • • • • • ' • ~ • ~ ... , • < ;. • . -- -- . ........,._ -- I"DI<TIMICI D, rAG( 11111011 I - . · ,. . . - •<rt. ... -I' ' ·I'· I"' ' , . #"'. ·-· *' .. .-··· ....... - -- ·' • ' . ' ------- ~ T ·. .· . . J ' .· t . ... ~ ... , . , .# ·~ .,. .. MOTU l.tfO..lHIICI(nm. --~--- Oofii\Mitt •• -.,..,, at ••r"11<o4"' a .,. .... -..:ttl!·-··._ Ma..a,11111 Ur>,O'IlfiC.I'\&11-IIOIIi/t~ lla .COIII!Oi• ftllav•L ee; ·-~,. .. ti.IIQ$S&III- •t ll•l(!tltl( ~IH( LQC&t-~O.tetltf--l\. t.c~··QO<· .......... .. I 104 LUUUIWo; L'"'l U&.D!,I)(s~I'IIIIU 4IU.llll-·lerf 1C#OIJ4M.IM.C .,.._~Jp.ll ·~::."!::11111110.1-'; ......... _UUI '!;"!:";~~':~""'iCLICf~--lllr.--- a•cc UllHlC ••&&e•• Ulllit~~ • '""""'"'" &10 1 .. J .. ~ ,17' ~· \t'P ~•I' / ... ~~~ .. fl.ti!U IIUf 111.\P fll* COf,.ft•f•lCIIt ... , ..... ·-"""'·"""ttl) "'''-"'"''""'"" • .,,u, .... ,.. ll&fl I'I.U( ltCoolfl cor, 1111 I t•.ttll •te • .-·• A t_,_, ........ _, L .... IMIR Ctl -•••an• . • lr. a·-.r=-.:::-.:::.:::.::-..:::-_-...::-_-.::-_-_ -_ -_::-_-_ _:-_ -_ -_-_._~-·---·~-~· -_·· .. _.. ~+y. ---· I ! . #;!;. I w t . I : FOG LA.KE.S RELICT CHANNEL EXPLORAT\ON MAP - " 2300 .SL-SW-3 W SL 80°7 AH-19 t 2240 2180 2120 2060 2000 1940 1880 1820 1760 A/8 c - - --- - - - - RELICT CHANNEL X-SECTION DR-22 BR AH·20 c /} ~---~ BR BR-SL ------------------- 2260 AH-26 2200 2140 2080 2020 1960 BR-SL 1900 1840 1780 1720 1660 " RELICT CHANNEL X-SECTION· ' ' ' "?--- ll. J ./ / / '\ / / BR·SL --~----~---~-_._. __ .....,. _______________ _ .. - - - - - - - - - - ---- -'-- - - 2250 2190 2030 2070 -2010 ~ -~ 1950 fi :> liJ Lil 1890 1830 1770 1710 1650 0 600 1200 RELICT CHANNEL X-SECTION I .~ G lt. I I I I {\.. I I I I I 1800 2400 3000 3600 4200 HORIZONTAL DISTANCE ( 111 = 600') I I 4800 5400 6000 --------·---------- BORROW 1 o• X-SECTIONS 2400 2340 2280 F F 2220 G 2160 2100 ---AI~---------------------~~-__.--------tr:7Jlf!:r1U o• 2040 1980 1920 --::---::::-::---:-::::-:--~=-:--~':-:---:-:---.l_---L----L---_j_--_J_---L---L~----.J 0 800 1600 2400 3200 4000 4800 5600 6400 7200 8000 8800 9600 10400 ------------------- BORROW 'D' X-SECTIONS 2400 2340 AH-D-13 D AH-D-15 2280 2220 2160 --?-. . --? ----....... "" E A/~ "'-, ' ....... ' ......... """-2100 ~ .............. ' '-......... ' ........ , .. ~ ......... , 2040 ' ......... ' "" \ \ 1980 \ \ \ \ 0 600 1200 I BOO 2400 3000 3600 4200 4800 5400 6000 6600 -· ~---· - - - - - - - - - -,. --· - - BORROW 'o• X -SECTIONS 2400 DR-14 J ..... 2340 ,.,. c 0 2280 // / AH-t9 .,/ '7 '7 A/B ·- 2220 E 2160 G' 2100 -......... 2040 \ // 1980--~----~_.--~~----~~~~----~-----L-----L----~------L-----~----~----~----~· 7200 7800 6600 5400 6000 0 GOO 1200 I BOO 2400 3000 3600 4200 4800 I I, I I •• I. I I El I I I I I I 0 SET II 042./85°NW -() . - SET ::nz: . N • 4 • 325o/90~ .. SET :r- JOINT PLOT UPSTREAM PORTAL AREA w~ ) I I I I •• I . . I I i I I I I I I I SET, n 042./85°NW . 0 . SET Dr 0 0 . N 325crgoo SET :r- JOINT PLOT UPSTREAM PORTAL AREA t f • .. • • ' • 1 . , w~ ----------------· -----~~-------~ - - - - ---- - --· - - - - - --7 - - [~~~(~] WATANA 1982-85 PROPOS,ED GEOTECHNICAL INVESTIGATION PROGRAM BORROW AREAS INVESTIGATION/ RESERVOIR GEOLOGIC MAPPING DRILLING a TESTING LABORATORY TESTING GEOPHYSICS RELICT CHANNEL INVESTIGATION DRILLING a TESTING LABORATORY TESTING DAMSITE INVESTIGATION GEOLOGIC MAPPING GEOPHYSICAL SURVEYS DIAMOND DRILLING RIVER DRILLING TEST AOITS LABORATORY TESTING 1982 1983 1984 JFMAMJJASONDJFMAMJJASONDJFMAM~JA~ONO ----..mf- -~~~-tt;·--~---!------ •••m B;C>;';tr_ --am-m-:·-"'"~----~-m~ ~~--~rm ·-ril I II[IIJI,f.-~- ~-m ·- ---.. !I 111[111 D! M-·=--~~=~--