AD-R144 749 NATIONAL PROGRAM FOR INSPECTION OF NO*-TIkuunR uny,. .GARDNER LAKE DAM (CT.. (U) CORPS OF ENGINEERS WALTHAM MRNEW ENGLAND DIV NOV 19

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MICROCOPY RESOLUTION TEST CHARTNATIONAL BUREAU OF STANDARDS I963-A

THAMES RIVER BASIN/BOZRAHCONNECTICUT

U GARDNER LAKE DAM

CT 005120

PHASE I INSPECTION REPORT

NATIONAL DAM INSPECTION PROGRAM

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DEPARTMENT OF THE ARMYNEW ENGLAND DIVISION, CORPS OF ENGINEERS

WALTHAM, MASS. 02154

NOVEMBERI 199 Appov

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"iPr' ASSTETrfSECURITY CL ASSIFICATION OF TIS PAGE tflhe Dam &.e..ed)

REPORT DOCUMENTATION PAGE EAD INSTRUCONSBEFORE COMPLEITING FORiM

I. MCPORT NiUMban ' GOVT ACCESSIWO NO, S. CREiPIENT*S CATALOG Numesaf

CT 00512. TITLE aid S,,Ia"eJ S. VVPE oF MEPORT & PamOO COVERUO

Gardner Lake Dam INSPECTION REPORT

NATIONAL PROGRAM FOR INSPECTION OF NON-FEDERAL 6. PEFORMNO ORG. REPOAT NuMUELDAMS _ _ _ _

T. AuTNOR(a) 4. CONTRACT On **ANT NuMSEt/iv)

U.S. ARMY CORPS OF ENGINEERSNEW ENGLAND DIVISION

9. PI[MFORMING ORGANIZATION NAME AND AOE9SS 10. PROGRAM E4E0N8T PNOJECT. ?AMARGEA & WOR UNIT MUVgIfnS

I V CONTROLLING6 OPFICER AMC AND AOOR9S 12. RGPOR? DAT6

DEPT. OF THE ARMY: CORPS OF ENGINEERS November 1979NEW ENGLAND DIVISION, NEDED ,a. SOUSER OFP-O9424 TRAPELO ROAD, WALTHAM, MA. 02254 4014. MONITORING AGENCY NAME a ADORKSO(oE ditIenmt hem Cmea adg Offiee IS. SECURITT C.& (04! am@ vetQ

UNCLASSIFIED

IS. OISTRIRUTION STATEIMENT (of e. AM.N)I

APPROVAL FOR PUBLIC RELEASE: DISTRIBUTION UNLIMITED

IT. OISTRIUUTION STATEMENT 100 a. 01011. Me0 0 D N. I 6= mps ".,')

It. SUPPLIEMENTARY NOTES

Cover program reads: Phase I Inspection Report, National Dam Inspection Program;however, the official title of the program is: National Program for Inspection ofNon-Federal Dams; use cover date for date of report.

IS. KEY WORDS (Centslme a fewin .l4d It ago*@" ad MSlllI l, l6 ylNo "SiN3I)

DAMS, INSPECTION, DAM SAFETY,

Thames River BasinBozrah, Connecticut

20. AGSTIMAC T (Cealmwe iIn ev sideO It .0o6a8i, l aid 14e00i F 610* Rhin.11)

Gardner Lake Dam is an earth embankment with a shallow concrete wall that extendsnearly across the full length of the upstream face. The dam is about 168 ft. longand is about 9.6 ft. high. The dam is judged to be in fair condition. Tie testflood inflow equals 4,600 cfs. The size classification, which is based on thestorage volume, is Intermediate. The dam has been classified as having a signific "thazard potential. The range for the test flood is h PMF to a full PMF.

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DEPARTMENT OF THE ARMYNEW P LANO 0' IOV P.a C RPS Cf- IS

424 TRAPELO ROAD

WALTHAM MASSAC"USJ6ETTS 02154

NkEDED

Honorable Ella T. GrassoGovernor of the State of Connecticut

State CapitolHartford, Connecticut 06115

Dea." Governor Grasso:

Inclosed is a copy of the Gardner Lake Dam Phase I Inspection Report,which was prepared under the National Program for Inspection of Non- 0Federal Dams. This report to presented for your use and is based upon avisual inspection, a review of the past performance and s briefhydrological study of the dam. A brief assessment Is Included at thebeginning of the report. I have approved the report and support the

*findings and recommendations described In Section 7 and ask that youkeep me informed of the actions taken to implement them. This follow-up 0 0action is a vitally important part of this program.

A copy of this report has been forwarded to the Department of Environ-mental Protection, the cooperating agency for the State of Connecticut.

Copies of this report will be made available to the public, upon 0 0request, by this office under the Freedom of Information Act. In thecase of this report the release date will be thirty days from the dateof this letter.

1 wish to take this opportunity to thank you and the Department of • 0- Environmental Protection for your cooperation in carrying out this

program.

Sincerely,

Incl a CHEID

As stated Colonel, Corps of EngineersDivision Engineer

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PUASI I UMSP=CTIO REPORT

Ideaificasion No.: CT 00512Now of Den: Gardner Lake DeTom: lo3abCounty and State: New Lendo. County, ConancticutStream Gardner BrookDate of Inspection: 9 sad 24 October 1979 " 0

SRaW ASSUMT

Gardner Lake Dn Is an eartb embmmet with a shallow concrete eaIl that esteads 0 0nealy across the full lenth of the upcrem face. The dam is about L ft. Longand to about 9.6 ft. higb. The top widtb of the dan varies from about 72 ft. nearIts left abutmnSt to 154 ft. sear Ito fight abutment. A secondary road paseesover the crest of the dan sear the dowstrem face. the dan haM ce concretesplUelms. The serviee spilluy is located sear the left abutmat and has a mntweIr crest length of 11.3 ft. A combined oulLary spiltlwy and outlet stricture S Si located near the rith abutmet. The miliary spillway** crest is slightlyblber than the service spillway and hm a set wat crest leegh of 12 ft. Theregulating outlet is controlled by a 3 ft. square sluice gate.

The lake behind the dan is about 9,400 ft. long mmd ham a surface are at spiLl-my level of about 521 acres. The drainage area above the dam to 3.63 eq. at.sod the maxim storage to the top of dan ie estimated at about 3.270 acre-ft.The size clamification, wbich i based on the storage volume, is itermediate.Fallure of the dan my cause appreciable ecoami Wessod lose of a fee tives,and thum the dam he bees classified as hoving a significant baard potential.Moaed on Intemedlate sLam sad significant hIazrd, the range for the test flodis PW to a full FW. The selected test flood for the project is PlW.

The da to Judged to be i fair condition. Thre was No evidence of seepage andthe an appeared to be geerally well eintained. There are cracks tn the coa-crete approscb trsaag" wells of the serice spillway, and the eanesnt justright of the right training well shied sigs of settlemt. Voids were alsoevident adjacent to both approach trainig wells. The combined auxili ry spill- 0 0my and outlet structure, reconstructed is 194,, me found to be is good condi-tion. but there appeared to be erosion of the earth ambebm t imediately dow-stream of the structure. 1rush powth was noted on a mail berm atog the riaof the reservoir to the left of the an sad in the discharge chaNel of &hemusilary spillway. There was omn large ela tree on the dam elbhasmeat. * *

The test flood Laflo equals 4.600 cfs. The routed test flood outflow of 1,000 cfeovertop* the mn-ove-f lov sections of the dam by 1.10 ft. The spillwey can pess235 cfs or about 24 percent of the routed test flood outflow vittout overtoppi gthe dam.

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ViLtba ooe you after receipt of this fb.e. I Inspection Report, the evwr.the State of Cmnecticut, Deparment of kbvtrcmmtal Protection, should:(1) asseos furtber the potetial for overtopping and the adequacy of the spill- -0ways; (2) investigate the settlsew t of the emsankmet to the rigbt of the er-vice spillumy and the potholes and voids tn the mbunmmt adjacent to thetraining male; (3) investigate the structural cracks L the concrete trainingmile of the service spillvey sad the eettlemt and cracking of the concrecalil as the supetrm face of the dasnme.t where It intersects the right train-

Ing well; and (4) Inveetigate the eroeom imediately downstrem of the auxLl- " O

lary spilivey end design appropriate stilling basis nd elope protection.

The mor should also Iaplemenc the folLwing operating sad maintenance sasures:(1) remove brush growtb from the berm to the Left of the d4a and in the dLs-charge cbemel of the mitiary epillway. end rmoe a large elm tree from theminbammcg (2) repair eroetom to the riprpped slope at the end of the south- *eat viewavel of the rombay culvert in the service epillwey discharge chemel;(3) repaint mritar joints in the dmowstrm traising wells of the mln opiLway;(4) caplote md Ilaemnt the formal survellace end flood veruing plan cbatto in the process of being developed; and (5) Iastitute procedures for an manaLperiodic cechalcal laspectlas of the dan.

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MhS reort is prepared under sAWWdAc contained is the Recoeod Cuidelimesfor Safety Inspection of Oes, for Phase I lnvestgation. Copies of these 6 0sildeliaes my be obtained frow the Office of Wtf of Egimers. Vesins-to., D.C. 20314. Ihe purpose of a fPhse I towestigacion is to identify epe-ditlously those dam ubicb my pose hasards to him life or property. lbsassesmest of the 8earel condicti of the dam is based u.-e available datasad visml Iepectlems. Detailed lsseitetiom. Od aalvyes involving top-

1graphlc mppig. suburf ce IuvssigaStoms, tootieg and detailed cmpue-tiosma evalualons are beyead the scope of a Phase I invettgactoo aioever.the Invstigation Is intended to Idetity amy seed for ouch otvdtoo.

to rewlwairg this report. it ehosid be realled rhat the reported coeditio.of the dm is osed o obeervatiee of fftld coditlens at the cle of Le-opec ites slo with data avatlabl, to the iapec cloo ten. to cases re

the rese oir Wae lewered or drated prior to laspecttose, sucb sctioe WileImproving the stability sod "et? of the dam. rne the normal load emthe structare aed my edbcvce certasn conditioss kicb eigbt othervise be 4.-tectable Itf ine ced under to mormal operacLng environment of tbe struc-tWO. * *

It is iotast to ntO that the cadi: lem of a am dopes" OR *wre aendcomstantly chestIa internal so mermal coaditoo. OW is evola:iosary is"core. It eld be incorect to se that tbe p eent conditios of tbedem will cestime to vspresepr the condit m of the dam at goes poisto tbefuture. Oly ceough conisued care end Inspection cas there b amy chases *thet aoote conditios be detected.

pbtse I lnspectlesn are not litended to peowIde detaLled hydrologic and

hydrealle awlyse. . accordance with the establimed Osidolises, theSpillwy lot flood i based so the etlmoted "Probable tmaim Flood" forthe iqgim (Sryeeeet reeesoably possible store vet), or frction there- * *of. Wes of the gstude end errity of Ob a amm ovet t a findingto t a Wille will O Poe the teet flod old st e istem ted asO eenee rtly posin b41ly 104equoto cenItim. Th test flood PrOrleea oemos of relative spillle capiy ad seres as #m oid is doterlis-Lag the se" for mone detailed b"yreloic ad fdrstlic studies. Cotsideft-

fta the sis of the jaM, Its gosanl CmildiON and the d0Mtr dare * *Poetial.

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GARDNER LAKE DAMFITCHILLE . CT. QUADRANGLE

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PHASE I INSPECTION REPORT

GARDNER LAKE DAM CT 00512

SECTION 1 - PROJECT INFORMATION 0 0

* 1.1 General

a. Authority. Public Law 92-367, August 8, 1972, authorized the Secretaryof the Army, through the Corps of Engineers, to initiate a national program ofdam inspection throughout the United States. The New England Division of theCorps of Engineers has been assigned the responsibility of supervising the in-spection of dams within the New England Region. Louis Berger & Associates, Inc.has been retained by the New England Division to inspect and report on selecteddams in the State of Connecticut. Authorization and notice to proceed was

issued to Louis Berger & Associates, Inc. under a letter of 28 September 1979from William E. Hodgson, Jr., Colonel, Corps of Engineers. Contract No. DACW33-79-C-0051, Job Change No. 2, has been assigned by the Corps of Engineers forthis work.

b. Purpose of Inspection

(1) Perform technical inspection and evaluation of non-Federal dams toidentify conditions which threaten the public safety and thus permit correctionin a timely manner by non-Federal interests.

(2) Encourage and assist the States to initiate quickly effective damsafety programs for non-Federal dams.

(3) Update, verify and complete the National Inventory of Dams.

1.2 Description of ProjectU s S

a. Location. Gardner Lake is located in the Towns of Salem, Montvilleand Bozrah, Connecticut, and is the headwaters of Gardner Brook. Gardner LakeDam is situated at the northeast corner of Gardner Lake in the Town of Bozrah,New London County, Connecticut. The dam site is about 4.9 miles upstream fromGardner Brook's confluence with the Yantic River and is shown on U.S.G.S. Quad-rangle, Fitchville, Connecticut, with coordinates approximately at N 410 31' 31", S SW 720 13' 21".

b. Description of Dam and Appurtenances. Gardner Lake Dam is an earthfill dam about 9.6 ft. high and 168 ft. long, constructed across a shallow valleyreach on Gardner Brook. The top width of the dam varies from about 72 ft. nearits left abutment to about 154 ft. near its right abutment. Lake Road passes 0 0

across the dam adjacent to its downstream face, the road embankment serving aspart of the dam. The dam is essentially a low spillage - low surcharge facilityand the impounded waters are used for recreation. A shallow vertical faced con-crete wall extends along about 105 ft. of the upstream face of the dam. The re-minder of the upstream face has a variable slope which averages about 1 hori-zontal to 1 vertical. The crest of the dam slopes downward slightly from the S S

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upstream face of the dam to Lake Road. Along the reservoir rim to the left ofthe dam there is a small berm about 3 ft. higher than normal water surface,which extends for a distance of about 96 ft. The right abutment of the damabuts onto a small recreational facility situated on the shore of the lake.

Two spillways have been constructed within the dam embankment. The service 0spillway is located about 30 ft. from the left abutment; it is a broad crestedconcrete weir which tapers in width from its upstream end to its downstream end.The spillway is 11.5 ft. wide at its narrowest point. About 42 ft. to the leftof the right abutment there is a concrete combined spillway and outlet structurewith a crest height about 0.2 ft. higher than the service spillway. This auxil-iary straight drop spillway has two openings, the left opening being 8 ft. wideand the right one about 4 ft. wide. The two openings are separated by a concretepier which, together with the end walls, supports a concrete walkway across thespillway. Below the 4 ft. spillway opening there is a low level outlet which iscontrolled by a 3 ft. x 3 ft. sluice gate.

Outflows from the two spillways are conducted across the dam in two separate openchannels, which pass under Lake Road via two culverts, one for each channel. Be-yond the right culvert, outflows from the auxiliary spillway and outlet gate entera manmade channel constructed of stone masonry. Outflows from the service spill-way enter a natural channel after passing through the left culvert. Between thesetwo channels, the upstream face of the dam and Lake Road, the crest of the dam(which has a slight depression) serves as a parking area for visitors.

c. Size Classification. Gardner Lake Dam is about 9.6 ft. high, impound-ing a storage of 1,945 acre-ft. to spillway crest level and about 3,270 acre-ft.to top of dam. In accordance with size and capacity criteria promulgated in theRecommended Guidelines for Safety Inspection of Dams, capacity governs and theproject is categorized in the intermediate classification.

d. Hazard Classification. A breach failure of the dam at Gardner Lakewould release water down Gardner Brook leading to the Yantic River. Lake Roadwhich crosses the dam would be severed. Between the dam and Scott Hill Road, adistance of about 2 miles, the brook is narrow and steep dropping about 140 ft.in 11,000 ft. There are no structures within this reach of the brook and noproperty damage is anticipated above Scott Hill Road. At Scott Hill Road it isanticipated that the roadway would be flooded and that one house located on theeast side of the Scott Hill Road crossing of the brook would sustain damage dueto flooding. Beyond Scott Hill Road the brook is joined by several others, andit meanders along a course which is much flatter in slope, dropping about 80 ft. 0in a distance of about 13,700 ft. It is not anticipated that there would beany property damage in this reach of the brook arising from a breach of the dam.

In summary, Lake Road, Scott Hill Road and one house on Scott Hill Road would beexpected to sustain damage in the event of failure of the dam, and that there isa potential for the loss of a few lives. Consequently, Gardner Lake Dam has been 0classified as having a significant hazard potential in accordance with the Recom-mended Guidelines for the Safety Inspection of Dams.

e. Ownership. The dam is owned by the State of Connecticut, Departmentof Environmental Protection, Room 207, State Office Building, Hartford, Con-necticut 06115.

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f. Operator. Mr. John Olson, Regional Manager, Region IV Headquarters,Connecticut Department of Environmental Protection, RFD 1, Sheldon Road,Voluntown, CT 06384. Telephone: (203) 376-2513.

I g. Purpose of Dam. The dam impounds a lake used for recreational purposes.

h. Design and Construction History. It is not known by whom the dam wasdesigned or constructed. A 1966 inspection report by the State of Connecticut,Water Resources Commission, notes that it was thought that the original dammight have been constructed around the year 1900. The dam is believed to have

-- been partially rebuilt in 1969. Plans of the 1969 reconstruction of the damindicate that the existing drawdown structure was removed and replaced with anew structure that serves as a combined auxiliary spillway and low level outlet;that the portion of the upstream wall between the two spillways received a newcap; that the outlet channel from the new spillway was reconstructed; and, that

- the channel from the service spillway received riprap protection on its leftside. Copies of the plans showing this work can be found in Appendix B. •

i. Normal Operating Procedures. There are no formal operational pro-cedures for Gardner Lake Dam. The low level outlet gate is used in the fallof the year to draw down the lake for the benefit of shoreline property owners.

1.3 Pertinent Data

a. Drainage Area. The drainage area contributing to Gardner Lake issituated at the headwaters of Gardner Brook. The drainage area encompasses atotal of about 5.63 sq. mi. (3,603 acres), of which 521 acres are occupied by

I the lake. The longest circuitous stream course contributing to the lake isabout 12,400 ft. long with an elevation difference of about 76 ft., or at aslope of about 32 ft. per mile. The drainage area has a length of about 2.08miles and a maximum width of about 3.98 miles. The basin consists of both openfields and forested areas, with sparse population, and the terrain is best de-scribed as rolling. Several youth camps are located on the shores of the lake.

m b. Discharge at Damsite 0

(1) Outlet Works Conduit. Low level discharges from Gardner Lake are pro-vided for by a 3 ft. x 3 ft. sluice gate which is controlled by a hand operated,screw stemmed slide. It is estimated that with the gate wide open the outletwould be capable of discharging about 144 cfs when the lake water surface wasat test flood level. With the water level at top of dam, the discharge capacity Swould be about 133 cfs with the gate wide open.

(2) Maximum Known Flood at Damsite. No records are available of floodinflows into Gardner Lake nor of spillway releases and surcharge heads duringsuch inflows.

(3) Ungated Spillway Capacity at Top of Dam. The total spillway capacityat top of dam, elevation 386.25, is 235 cfs.

(4) Ungated Spillway Capacity at Test Flood Elevation. The ungated spill-way capacity is about 460 cfs at test flood elevation 387.4 MSL.

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(5) Gated Spillvay Capacity at Normal Pool Elevation. Not applicable

(6) Gated Spillway Capacity at Test Flood Elevation. Not applicable

(7) Total Spillway Capacity at Test Flood Elevation. The total spillwaycapacity at the test flood elevation is the same as (4) above, 460 cfa atelevation 387.4 MSL.

(8) Total Project Discharge at Test Flood Elevation. The total projectdischarge at test flood is 1,000 cfs at elevation 387.4 MSL.

c. Elevations (Ft. above NGVD)

(1) Streambed at centerline of dam - Left Stream 377.7Right Stream 376.7

(2) Maximum tailvater - Not available

(3) Upstream portal invert diversion tunnel - Not applicable

(4) Recreation pool - 384.0

(5) Full flood control pool - Not applicable

(6) Ungated spillway crest - Left spillway 384.0Right Spillway 384.2

(7) Design surcharge (original design) - Unknown

(8) Top of dam - 386.25

(9) Test flood design surcharge - 387.4

d. Reservoir

(1) Length of maximum pool - 9,400 ft.

(2) Length of recreation pool - 9,350 ft.

(3) Length of flood control pool - Not applicable

e. Storage (acre-ft.)

(1) Recreation pool - El. 384.0 - 1945

(2) Flood control pool - Not applicable

(3) Spillway crest pool El. 384.0 - 1,945

(4) Top of dam El. 386.25 - 3,270

(5) Test flood pool El. 387.4 - 4,030

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f. Reservoir Surface (acres)

(1) Recreation pool El. 384.0 - 521

3 (2) Flood control pool - Not applicable 0

(3) Spillway crest El. 384.0 - 521

(4) Top of damn El. 386.25 - 641

(5) Test flood pool El. 387.4 - 703 S S

S. Dan

(1) Type - Kerth fill

(2) Length - 168 ft.

(3) Height - 9.6 ft.+

(4) Top width - Varies

' (5) Side slopes - Downstream: varies, but all on slight slopeUpstream: vertical concrete wall

(6) Zoning - Unknown

* (7) Impervious core - Unknown

(8) Cutoff - Unknown

(9) Grout curtain - Unknown

I h. Diversion and Reaulating Tunnel - Not applicable

i. Spillway

(1) Type - Left: Main Spillway - broad crested concrete weirRight: Auxiliary Spillway - straight drop concrete weir

(2) Length of weir - Left - 11.5 ft., Right 12 ft. 0

(3) Crest elevation - Left 384.0, Right 384.2

(4) Gates - None

(5) Upstream channel - Reservoir • 0

(6) Downstream channel - Natural river channel (left)- Manmade channel (right)

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j. Reulatin OUt~eta

(1) tzwert - 377.5

(2) Sze - 3 ft. z 3 ft. square openlng

(3) Description - One opening just right of auxiliary spillway

(4) Control Mechanlen - Rina operated, screv type slide pe.

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S2TMIM 2 - IGIUUIU DATA

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go data os the design of the original dam or appurtenances a bees recoveredad probably some eiusts. Two plas have been obtaine owoving sa proposedreconstruction work which is believed to have been carried out in 1969. Atthat time the den was owned by the State of Connecticut, State Board of FLshertesad Gane, wbich retained the services of hsccki and Noffma. Bngisers, of dart- •ford, Connecticut to perform enagineering services for the repair of Gardner LakeDes. The two plans baving the repair work can be found tn Appendix B.

2.2 Cousmtion Data

No records or correspondence regarding coustruction have been found, with the 0 0

exception of a State Lampectios Report that noted the dan was recostructed in199.

2.3 Operatio Dets

The dam is operated by the State of Connecticuc, Deparmenc of Ssviromstal •protectios. There appear to be no formnl records.

2.4 gveuetios of Data

a. Availability. Since n pertUnent esiLnaeriLg data ise available, it is -0

not possible to sake an asesinnt of the safety of the emnkment. The basisof the infor tiom presented in this report is principally the visual observe-tiome of the Inspection team.

b. Adequacy. The lack of in-depth engineering data did not allow for a0 definitive review. Therefore, the adequacy of this dm could not be assessed

from the standpoin: of reviewing design and construction date, but is basedprimarily on visual inspection, past performce history end sound enSgieeringjuds C.

c. Vaidity. Not applicable.

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SBTrIOP 3 - VISUAL IMF==I

3. 1 Find tow

a.Gnrl The visual Inspection Of Gardner Lake 0.. took place as9 and i4Oct 197 .O 9 October the water wee about 0.1 ft. abov* che

right spillway cresl aod about 0.3 ft. above the Lett spillway crest. The com-bLued discharge over the spillways, wa etiated to be about 10 cfs. Tuera was *so evidence of my ajor aintenance problem, but a tow Item require attention(see Secttion 7. 3). The dam was Judged to be In fair condition.

ab. U Then mo a low surcharge - low spillage facility, impoundinga lke AMI019used for recreation. It to an earth fill dam with a shallow

* vertical concrete wall along mot of its upermw face. It ise about 9.6 ft.high sadi 145 ft. long, the top width varying fromeabout 72 ft. near Its left Sabutmust to about 154 ft. near Its right abutmnt. Lake Road posses across thedow neaw Its dmantrom face. The cresl of the des elopee dwwrd slightlyfrom the upecremn face to Lake No".

It iti conjectured that the roawy emankmt existed before the dam wee built* *and that wbo the dam wee construc ted, earth fill mwe placed between the up-stream conrete wall end the roedumy, thus forminl se earth structure. Aloegthe reservoir nat to the left of the dam there to a smell berm about 3 ft. higherthen normal water surface, about 9% ft. long. The berm was covered with brushsod saplings.

h There wase no evidence of mny seepage coming from the earth emankent. This toeundoubtedly due to the great width of the seolnet in comparison to Its height.particularly to the central portion, so that my seepage would be well belowground end sot observable.

There wa a 3 ft. diameter @Is tree c-i the dam sobenhnt, located about 20 ft.*from the upetream face, between the two spillways.

c. Ainutgnat Structures. There are two spillweys in the upstream faceof the dam, both of which are constructed of concrete. The service spillway hasa oet weir crest length of 11.3 ft. sad is located about 30 ft. from the left abut-ment. It Is a broad crested weir with converging approach wlls (see Photographgo. 7). The auxiliary straight drop spillway has a set weir crest length of 12 ft.and a crest about 0.2 ft. higher than the service spillway. it is located near theright sbutuet in a combined spillwey and outlet structure containing the reguIat-ing outlet for the lake, controlled by a 3 ft. by 3 ft. sluice Sato. The struc-ture has two side walls and a center pier. separating the outlet Sate section onthe rignt side from the overflow section on the left (see Photograph 10. 1). anda footbridge over It.

Photograph No. 2 to a general view of the concrete well to the left of the ser-vice spillway, showing cracks in the concrete, which is in poor condition. Theremoire also cracks in the concrete well to the right of the spillwvay ad mortar ismissing from the asonry training wells on the downstrem aide (see Photograph

foe. 4smd 5). The earth esbaskosat between the service epillway and the left, *abutent to contained as the dowstrom *s by a nibble ensosry well with sosorter ts the joits. The ribble mosry wall is onmly. few feet dowestrsemof the cnrete wall, is t about I.5 ft. high (see Photograph go. 6). Justgo the left of the service spillway Ondowstrem of the concrete wall thereare sam potholes measuing approximately I ft. by I ft. (Photoraph No. 3).

Photograph go. S shows a low arm ts the embeesmme behind ehe right approachtraining wall to the service spillway. Moi my have been caused by sectomeor the tons of fine.. The settlami t my alo be related go the settlnt ofthe concrete well sm the upetresm side of the ebshmt smet to the right grain-too wall of the spillway.

The outlet channel freio the ryice spillway passes through a concrete box cul-vert under Lake Reed (Photograpli No. 9). grotos has taken place on the rightside of the channel a& the ed of the concrete vlawel . The out let chnefor the aweiliary spillway end low level outlet is slightly lower thas the otherchannel. Msi channel is riprep protected ad ltods to a corruatoed mecal pipewth mosmty arch culvert under Lake Road. show Is Photographi ft. 10, wich ale.oshows the vegtem t hat wae growig is the chanel.

The general condition of the combined asiliary epillway sd outlet structurewee soo". The regulasias outlet for the dam consiss of a I ft. square oLuttewhi1ch Is controlled by a slide gate. The mount operating mcbm for the out-let gate aippeered to be In goed condition, but waset demoscraeed. It was re-**ported to be opera:ting. There wee sees erosion of the earth emanment on bothsides of the downstream channel adjacent to the structure (Photograph Xo. 1).

d. Reevi M The lake behind the des to a poedting of Gardner brookwhich io used for recresslomal purgoes. Numherou ummer cn" ed youth campeare located aoug the shorelines of the lake. Menet of the shore is gently *Login%ad there wae as evidence of slides, or other problem.

*. ftotren~j gk.selow the culvert opsIns under take loed, theepillwey disherjes fromCodm Lake flow to two separate chanes which lotstogether a short distance, donstream of the dam. The discharge canl for theservi1ce spillway culvert Is a natursl channel. The channel douatr of the* *sumiliary spillway culvert Is memo" with vertical rubble mesoury walls. Forabout two mles* dstrees of the dms to Scott Mill Road, the broo narrowend drops at a rate of ahout 67 ft. per mlle. Seod Scott R1ilI load the slopeof the brook to sbout 31 It. per mle*. to this reach the brook's valley to som-what wider ad more valley storae *Wae is available. About 4.8 sales below thedes Garder brook joins the Tend.e River.* *

3.2 I!elyAEo

to general, the visual Inspection of the dam adequately revealed kiey character-istics of the project as they my relate to its stability and Integrity, permit-ting en assessent to be md* of those features affecting the safety of the struc-turen. There wee no evidence of seepage sad the dam appeared to be generally wellminained. Thete wee som brush growth onthe berm as the reservoir rim adjoin-Los the left &buet end in the discharge chammel below the auxiliary spillway.The"e were cracks in the uptrnm concrete wall sod In the training wells of theservice spillway, o the ambeohuest just right of the right training wall showedsipsa of settlement. There appeared to be voids in the embaahet adjacent to *both training wells. A large elm, tree was growing on the dam embankment betweenthe two spiliweysi. Gardner Lake Dam was therefore judged to be in fair condition.

90 0 40 0 0 0 * 0

T1rU 4 *OPUAIONL POWM

~ 0 0

The Stima of Commectleg, Dep.,ms of btirommmal Urcects., to CAW emorsad MWpO. of the di0. Th.~. to. a law 1 l ouglet ot., 4bs hiLch tooperative. There are so docomeacod opereg ing procrue toe the din.6 The tao"to usually draw dom soc talltw th lb h t ig of obroilo pooperty ere. *

4.2 ftlsgemnc ot De

mbvoist.se specific us.am.s pragim to effect at Giarimer Lake m.@ %at*.-tommice ts, perfoid, s seeded by Suae. forces. Requitred msiocw c... t

ofe pertoU cvz&U at gross od bra*h as th. crest of the d.s catttas of brush, * *In fb. iotbarem ChMAmIS smd ale04 Che bet. to the laet o bsdm, Mad TOWeSof cinret ed mom mes tfcturse.

46.3 IOAtinp 2f Oratimi PI IUOe

* The MAY, opersAt faculty at this dem is tbm slide late to the outlet structure. 0It -ppins Ot mesume to the pg. bee bess pwfrtmrid Ws the past to bweep bmechmtm operaive.

4.4 ftecflsulem of -tmm bain la gri

as b uruag" eotes t n aoffect at Cardmor Lam Ow. USwevel, the Cvecticut 0Depertmit of belmmocals Protecti Asr s thecb process of doveloptag a tonal 0uWalag sysem for the faculty.

* The facility boo Oaflopl pefuita devlcos sd thereoro requires so detailed * *Opevusiag Procedures. "llatemme lavelves eriodiMc growth reuvovl from tbsemed~ sed inrvtulime rogeudlag seeps. slope ding.. aimi brws , etc.TWO operst: saegts, reqweirm checking sd repairs soud be Owe as somesory.The concrete sd aminr vai.1 should be opected periodically sed repaired ascomey. Doe formi versing system veder deveiopmeet should be Implinluted s

so" so poesibl.

10

S. telatosf of fesuoo

a. Geml Garinr Laha De- ts as eartb amaseat wuth a oebw up-sum~U vetcL gecrtre wall iupodtug a ftore Stoesoe of ahecus I .*s act*-

te. vtab provsim ter eo additional I."*$ Scro-tt. of capacitj to Igo ..ercars.spaes tohe sop of the dms. It ts baoicalvya tow spilla** - tow ouvrarfacilty Nowd ter recretiosal perose. Igosm opiluev ar. cavable of die-chergieg aONS 23 ct, viftsh are go the co at he dam. lb. emerl Cove-grPook .haracgortatleat of 5.63 "q. at. iraiewg basis, ts beat described asreIIag smeei. lbs draeage moos emss aboal 2.0S ailes oe m ad 3." "tooWide ad vnes trin etlevauim 384.O at spilwap cress so elevehios W6 168.. lbsarea to Pamarl1y forestad.* *

b. DMA&M gm. No hpdrleia or hpdrealte desilp Aes. wos retrieved forCsI*evI" em7~. npt for chat %*tcb is Sho on (he proposed recosssruictsmrPIA to5 Apped", S.

'9 0Ros. aDat. 0 records, are sum liabla to regard to Past overat iom*of she dmeweof.w ai~i sp aerme"S ns spills thswwo the epiliways.VAe maimn post %at lo"s are 0sAm~f.

d. viewM=UG".m* OnMidemi* whbc would Iadlest. possible %14%flows Wou the I&sr ft he dossersm cefte. is Was "too.

e.T~S m is 1 JILOM. C adwr Lihe ates mi capecity cure smid tables,ter se Is flo s"el", a show ib Sheots, 0-2 and S-3. AppeWmla. fordetermalugm sorfass sm and suercrg capeIsles * plastmered ares woreSabes tim msers delieted os U.S.G.S. 2.000 ft. per to. quedre"s sheets.

* The &Got flood thoesm to felsete the W~dreloSIC Sod hfirnlk .pecitY of SGmrder Labs Om us selec ted to accers, 0With the triterts P resetd ts thewSmed GuilIn for Jets, -- ecqo of am. Suit. thin dam in6 clso-tied as latemediate is also with a ttIftemet hmasri potemtiul, s test flooWith a rMW of % "W to a tall FM could be Selected, for the .,.lusti..t. So-6ases MAY~ CuM mesder reds OW. Ihes W i1 be affected. a test flood Of% F 9Wona selected. 0 0

Preclpitattis des. "m obtain"d trou 3intsl csavRe"or so. 33, whicbfor t1e Comssticat ares approalme 24.0 [a. otf 6 r botPost rainfall oese atoo sqware ale area. 'Us wolvo was the tedwcd 20 Peftest to allow for basissits shope and fit factors. The 6 hor rainfall was diattibuted lteo ~m how!

* lacm tal par-lode do suggested is CORt Pablicatisf IX 11 1411l. A cobstast 0 0loss factor of 0.6 is. e "Mmted from the Pmecpitatiist value to Itive aessraisf all s" to rprere so tloi hydeoglooft.

A trisegular iacrvmetal vaitgraph wooes a for the Isf low hydregtaPhs, mstv4a compted lag tim "wale of 36bouets, ("ea Computations om Sheets IJ4 tmv 00-141, Appssdi* 0). indicating a pesh inflow of 060- 9.200 efs far a full FW@,4,60 cfe for a 9W ot a ON of abot Sit far a Na PP.

oteehaig tables and ewees fer the spillway Os for over tbe t" of tb. tawn&to showe as Shegs DA thm ",4 Apendixu 0.

A reserwir floo rowilas we PerfeSd for the toot flood. The reets of chtsrourtus are abov as Setg 0-12 Cd or* in,1asd belowe es tollmwo

e nlo"d Tost Flowd 3M. Rae. ftx. fta fovr ttd Test flood

"M~tt L§l Aft.4 .~ 1.0

Fvm the above table. it cam be sees that the Prologt will sot Pas thbe rouged 0tet floo outflow withou ove ts gje dm by t.15 ft. vlawever. the spil-

was a pow. about 24 Pnert, of ahe gooted test flood wutlow without ever-topplisegbte do.

b~ t, ~iou 411diacused above, the dmr would be oertoppedby 4W rvea gos fow alfou.Als". a breach swism to strwcural failure of

the dim by pipin or sleloghka to pogIbility. for this malvrls, a brewasysemed vit the water l4"vel a o of dis. Tme Aral* of tbm6, criteria 04-vosted to the No March lots Oaisome Repor w as io for the tailor. salyele.Vith.a brath width of 40 ponett ofte dim 1..gth. or about 67 ft.. me outflow

* of about ),570 tie. which Inulsie US eto fre, the optilmev. wuld be realisedtooe ameca 1.13 tbem 0.1. Appmdks 0).

Lake R..d. %M whcesee the dos* would he severd. leave* t dm ad Scottaki1 Road iomearem, a dl81i0e0 of about I ste. Gsrdoer Suoo follows a earrowrev ie" ofta ea fee- of 140 ft. to about 11.000 ft. 3.0 structures ae to-Catlled Within 41614 rwh Sad Mo prOperip da Should OCwf WRIthi It. 41t Scottlull1 ft" it to mosiIpsied twot the reusp would be flooed out ~0. the stromGrosses the rood. lsoe. ame hm tocated at ane southat corner of the roadwayeroeI"a would prsabbi oetalm floed danw, with a poemt 1al (fo the 140# Of afew lives. It to ost imted that the broo wuld rise about 4. ?1 tt. above tbelevelmo euetoo f re the spilivep diatkrep before failere af the desn.

Sepini $444 Sul Raw, the blow is Joined by several other ecr , fenedarssore. mad is so & ma flatter Oloe as It verts its way to the Toot ic RiVetabut 4.8 ailes below the de. As tinpectles of cslle rvaw% Idicated that soforther fiefleast propertv dmm wuld octw a&to% the 61o " a ltbowo~ the41ibehe. would got be p"t ly retarded 6y gal lot storawgo Im I the f lowsteethed the Vast Ic 1iver.

tois otp Lobe beod would be *eed, Scott 3i11 I*am sod ~s bovse vouldWsatle 9111f least ds", should a 6tue% of toe de oct with the Is&& levelat the top Of dam.

12

SUCTION 6 - STUCTUIAL STABILITY

ll Iv"lsatto of Structural Stabilty

a. Visul vftttM-A. There are no design calculaclons, as-built dravingsof other daa which would permit the preparation of structural stability compu-tailom. based a asemed *oil properties and engLneering factors. The dam is no

- stable bec Is i only faIr condition. Deficiencies described in Section 7 should jbe corvected.

The field ivesuclptlm of the service spillwmy revealed the following:

- (1) SISificaec structural cracks ln the concrete training walls.

(2) Settleneet of the earth embnkmnt crest to the right of the spillvay.

(3) Sal potholee and vowids I the embankomnt adjacent to the rightand left traiang walls.

(4) Sotglaee sod craeking of the vertical concrete vall on the Simpmem side of eiboent where It Intersects the rLhttrelatn wall.

(5) Noce of the elm tree exceed to the right training val and tothe u"eremi face of the dam.

b. Deel. .d CostructIA Data. No plans or calculations of value to astability seaseeseet are avalable for the dan which was constructed about 1900.

c. Oversteft oer"e. There are no operating records of any significanceto stm~gral stabiliy.

d. oet Comitructioe ChbmiA". There are no records of any poset construe-tine cl"ee made to the dan embokmmt. The 1969 repairs described in SectionI.I.b. shooid not adversely affect the stability of the dam.

e. Semlgc Stabilit". The dam is located ia Se smic ZoAe No. 1 and inaccordane with rec emded Phase I Guidelines does not warrant seimic analysis. *

1 3

13

MUG I

4# ft tbhe asi of gh basoh I viewl e8atelaimein GardmorLail. De amos, to be to 40t codkgtIs. I** detulasel.. rveuled U~tcac.ubku 0 th twbtmeig m obsotd be cwuSed onsd tbat ~ revdat workis 1* esdd. he 40)v# eewm V4th lb. oveall Itityi ot cbe dam or*

*1) lb. no. ep04t' Wil IT IPae aboou t ppst of the footed

I%"*hee we 6lpflaos 91liwiwal C"Kho to the conrete traIt**w.a&toflth swvte spl71sep sd Is the oaruea wall em the go-stlem (meet as4 I the de *.vullelv of lbs rtgt mirateg vall.

) Soctlawst *t a t so 1 ts fb 1,4014 Of lb. MegVic@SOU-Imm - madM4 Wehole* dad a 904ot the amlum adjaeattoe b. pmb trsialag wells.* *

6. algom of Oaem le The lath .t to*dpt a~inm 00.u..4 a 494 set&1100 tee adefigatiue frwia. fth.two. lb. aeqar of Cal* dam C'wId eat Weoasmeo" tmr lb. 9tans tat of te aia 4es10 am ird cotic5a "ato, but to6"" pl umult, on utsmal loopuette. Past eeuteew. hUsta? mod ob"awid0eas-most Iag ,dt. * *

4.602mThe Itoio 3mod f*~m 1*3 uro we .wted be lawshoomi bem~~td bt 06. SMet wvtM&3 Of pMSt fW411 teOf MttIS P6ase I

-' Pe -.

omet. petettloeftold wtil~lb. ta we of a coeto te~istetvd ptofe.014 owgmeor to goo rwrtbtt tomm"Ot 1.t Of tow(. Iwltga* od lONA 100e-Gmt tb. tomallev

~l) b.. b~teigb tud, *f lb. "fotle"q of the adt-lae IP0eet Saesett twtbot lb. petak1 lo(t ~vet0000mooa the Iftadequacy

of thes pi no".

(2 feelt.t th*ea tlemot of the ejtth 006alt Cw-egt t,& ttwrigh Of the setru* spillev$.sa t*e votboles mad vald. s t heOU0AM adjacawt to the rtt Cud left ttatlS wells.

II'

(3) Investigate the structural cracks in the concrete training walls ofthe service spillway and the settlement and cracking of the concretewall on the upstream face of the embankment where it intersects theright training wall.

0(4) Investigate the erosion of the earth embankment on both the left and

right downstream sides of the auxiliary spillway, and design appro-priate stilling basin and slope protection.

7.3 Remedial Measures

a. Operation and Maintenance Procedures:

(1) Insure operability of regulating outlet gate.

(2) Remove brush growth on the berm on the left abutment and in thedischarge channel of the secondary spillway. Remove a large 0e tree growing on the embankment and backfill with suitablemterial.

(3) Repair erosion to the riprapped slope at the end of the southeastwing wall of the roadway culvert over the service spillway dischargechannel.

(4) Repolat eertar joints in the downstream training walls of the servicespillway.

(1) Complete and Lmplint the forsal surveillance and flood warningplan chat Is in the process of being developed.

(6) lascitute procedures for an annual periodic technical inspectionof the deM.

7.4 AlteMnatives

There are no meaaingful alternatives to the above reconendations and remedial

15

. 0 0 0 0 • 0 0 0 * w 0 0p 0

b.

I. *0

* 0

* 0

* APPENDIX A 0

INSPECTION CHECKLIST

* 0O

* S S

S S

5 0

* 9 0

. . U S S 5 *e ~ S S S 0 0

VISUAL INSPECTION CHECKLIST

PARTY ORGANIZATION

PROJECT Gardner Lake Dam DATE 9 and 24 October 1979

TIME 1:30 PM

9 OCT 1979 Cloudy/CoolEATHER 24 OCT 1979 Cloudy/Rain

W.S. ELEV. 384.2 U.S. DN.S.

PARTY:

1. Peter B. Dyson LBA* 6.

2. Pasquale E. Corsetti LBA 7.

3. Roger F. Berry LBA 8.

4. Carl 3. Hoffman LBA 9.____

5. William S. Zoino GZD 10.

PROJECT FEATURE INSPECTED BY REMARKS

1. Hydrologic Roger F. Berry

2. Hydraulics/Structures Carl J. Hoffman

3. Soils and Geology William S. Zoino

4. General Features Peter B. Dyson

5. General Features Pasquale E. Corsetti

6. __-

7.

8.

9. I S

10.

*LBA - Louis Berger & Associates, Inc.

GZD - Goldberg, Zoino, Dunnicliff & Assoc., Inc.

A-1

0 • S S S S S S 0 5 0 • • 0 0

PERIODIC INSPECTION CHECKLIST0- •

PROJECT Gardner Lake Dam DATE 9 and 24 October 1979

PROJECT FEATURE Earth Fill Dam NAME William Zoino

DISCIPLINE Soils/Structures NAME Carl J. Hoffman

AREA EVALUATED CONDITIONS

DAM EMBANKMENT

Crest Elevation 386.25

Current Pool Elevation 384.2

Maximum Impoundment to Date Unknown

. Surface Cracks None evident

Pavement Condition N.A.

Movement or Settlement of Crest None evident

Lateral Movement None

Vertical Alginment Good

Horizontal Alignment Good

L Condition at Abutment and at Sink hole behind training wall ofConcrete Structures left spillway.

Indications of Movement of None

Structural Items on Slopes

* Trespassing on Slopes Yes. Vehicular traffic allowed on slope & crest. *

Sloughing or Erosion of Slopes Noneor Abutments

Rock Slope Protection - NoneRiprap Failures p

Unusual Movement or Cracking None evidentat or near Toes

Unusual Embankment or None evidentDownstream Seepage •

Piping or Boils None evident

Foundation Drainage Features None

Toe Drains None evident •

Instrumentation System None

A-2

0 O 0

PERIODIC INSPECTION CHECKLIST

PROJECT Gardner Lake Dam DATE 9 and 24 October 1979

PROJECT FEATURE Outlet Structure NAME

DISCIPLINE Hydraulics/ Structures NAME Carl J. Hoffman

AREA EVALUATED CONDITIONS

OUTLET WORKS - OUTLET STRUCTURE ANDOUTLET CHANNEL

General Condition of Concrete Good

Rust or Staining None

Spalling None

Erosion or Cavitation None

Visible Reinforcing None

Any Seepage or Efflorescence None

Condition at Joints Good

Drain Holes None presentChannel Outlet channel is the same channel as outlet channel for right

spillway (see next page).

Loose Rock or Trees OverhangingChannel

Condition of Discharge Channel

A-3

* 0

A-3

0 0 0n0il0 e 0 0

PERIODIC INSPECTION CHECKLIST

PROJECT Gardner Lake Dam DATE 9 and 24 October 1979

PROJECT FEATURE Spillwave NAME

I DISCIPLINE Hydraulics/Structures NAME Carl J. Hoffman 0 0

AREA EVALUATED CONDITIONS

OUTLET WORKS - SPILLWAY WEIR, APPROACH Left Spillway Right SpillwayAND DISCHARGE CHANELS

-0 0a. Approach Channel None None

General Condition N.A. N.A.

Loose Rock Overhanging Channel N.A. N.A.

Trees Overhanging Channel N.A. N.A.

Floor of Approach Channel N.A. N.A.

' b. Weir and Training Walls

General Condition of Concrete Fair Good

Rust or Staining Minor None

( Spalling Minor None

Any Visible Reinforcing None None

Any Seepage or Efflorescence None None

* Drain Holes None None *

c. Discharge Channel

General Condition Good Good; slope erosionbelow spillway struc.

Loose Rock Overhanging Channel None None 0 0

Trees Overhanging Channel None None

Floor of Channel Natural Rip Rap

Other Obstructions None Light brush growth 0 0

* S

A-4

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

* 0

PRIODIC INSPECTION CHEM IST

PROJECT: Gardner Lake Dam DATE: 9 and 24 October 1979

AREA EVALUATED CONDITIONS

Dike Embanknmenc N.A.

- Outlet Works - Control Tower N.A. 6

Outlet Works - Intake Structure &Intake Channel N.A.

Outlet Works - Transition & Conduit N.A. 6 0

Outlet Works - Service Bridge N.A.

1 0

S S

A-5

0 0 0 0 5 0 0 0 000 0 0 0 0 S

* S

N SO

- S 0

* 0

APPENDIX 3 *

KISGINEER INC DATA

SO

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p 0 0 0 0 0 0 0 S 0 0 0 0 0 0 0 0 0

1 CUM L) STATL OF cS::Tc,.:WA?" R SO=CZ.S ccftsic:-

harnford. r ;-

___________________________ S Sh0an on~ ;4:s Qjaddratn, ttYLL

Ono book_46 __LldheI &suth of lat. -

Dmat 009wu Laf northar ~ ia~:e.east of Lon&. _

i.:tz.:hai site froc nearest villase or rot &ncersoccio:.:

.7 :~. ur oreverse s18*)

Nor* as Mo. 163 - U-1A mil. ra ftut 82 Vmt m lake Am&* xm

i;.- .-- La~r for: _______ (Alteration) jpat~~-(cfltci. orns 07 =*TO Of O)

4, g p used for: Omnui 31"Bmsm

-f %:#ter immedi.ately above d: 7 t00t

I4. f t . I S S

-f ~11.5 ft. md Mor0t. CMISO

-.r.t c, at-utmtnts above spillway: 2 fetft~3g

* -:i v cc-atSruction: mE't

- ~..:ec"~Itact~ sothd st mets van REFURIW

* ...~.' ~ vill be set on.(Cra~

?wgin. of ~mm 1e1~.S igned: Q Ji~~v

(owner)

Name of En&Lneer. if an & Mm Ibfmas usue* ~ h'~-details of

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APPENDIX 9

IORMATOI AS CONTAINED IN

THE NATIONAL INVENTORY OF DAMS

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