CR 90-227 Hopkins Sanitary Landfill (2)
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. October 31, 1990 P K \ C~uncil Report: 90-227
HOPKINS SANITARY Lk<<DFILL
MBTHANB GAS RBMEDIAT!ON ~L~1
PrOpOtUII~ ~.1\ct. ion
staff recommends the following motion: lo!oye th1jt Council
adopt Resolution ~O-130 @..Qrov.ing ..R.1ans arlct _ specifications
for inst:~llation of gas moniJ;..,crs in the WestJ2rooke PatiQ
HQ..mes and authorizin~bids; move that__ Council ~t
Resolution 90-;1.31 approving }21al'1S ang, s.1i~Qificat.ion~L for
excavation of off-site l~ndfill and placement of a sy'ntil~tic
mgthan~ barrier at th~ 7th street lan~fil] si~_~nd
~uthQrizing bids.
Overvietf.
After extensive negotiations with the MPCA, that agency has
given approval to the City's proposed methan~ remediation
plan.
The City's consulting engineers; Braun Environmental and ReM
Associates, have worked feverishly to compile the necessary
. plan, specification az:td con~.ract documentation fer such ani
undertaking 0 At thl.s 1IIr1.ting t,herea.re s-cil1 s~verall
details to be cleared up. The ctms\llt.ants are laboring i
unCl.er the disadvantage of relyir.l.g on third pal~ty expertise I
in a fairly new field of environmental technolo9Y~
Council can expect, to racei VB a memo at the November 6
meeting that will provide more construction and cost. detail.
J?~imary. I@~_~oDsi~r
o ~~)at is the City's basic proposal?
o What impact will this proj~ct have on westbrooke
residents?
o What is the proposed timetable?
b.9.Po:[~ilJq IDfo~till
o Landfill Gases Remediation Plan (let:ter fr0111 Braun
to f.r!Pt~)
o Resolution 90-130
o Resolution 90-131
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.. JamesGessele- -~ ,~ -- .
:;:,>. Enqinaerin9 Superintendent
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Council Repon 90-227
Hopkins Sanitary lAndfill
. M~thane Gas Remediation Plan
1u:talysis
0 What is the city's basic proposal?
The city proposes to enter upor. Westbrooke Patio Hom~s
common area to remove any errant ,traces or pockets of
landfill and to redeposit the W<<st~ within the interior
of the landfill and to redeposit the waste within the
interior of the landfill. Suitable backfill materials
would be placed and compacted and landscape restorati.on
would be undertaken. 'rhe City further proposes to
excavate a trench to the water table along the eastsrn
and southern boundaries of the landfillj to place a
synthetic methane barrier in the trench to the water
table, and finally to redeposit the: waste from the
trench also within the interior of the landfill.
The issue of possible methane concentrations at the
northern reaches of the site will be addressed for now
with the installation of additional monit.oring wells
and a thorough evaluation program.
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An alarm monitor ing system is proposed for the eight I
units in each of the five Westbrooke buildings I
immediate.ly adjacent to the landfill. These monitor
alarms will be connected to a central locat,ion and
alarm conditions will be sent to this central location.
In addition, the city will provid.e ragular personal
visits to the homes with an explcsimeter.
0 What impact will this project have on Westbrooke I
residents?
Immedi&te effects from removing pockets of landfill on
the Westbrooke co:amnon area will b~ construction noise
and pervasive garbage odor. They are m.itigated to some
extent by the construction season itself and windl..)ws
and doors will be closed. The nontract. specifications
will mo&t certainly contain p:rovi::d.ons for the
oontractor to operate within limited hours of a work
day and to proceed with immediate backfill cperations
once landfill is removad~
Resid6fits in the adjacent homes will also experience
inconveniences during installation of the alarm
monitors and at times when personal visits are made to
their homes for the taking of methan~ readings.
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p&ge 3
Coll!lciJ Report 90-'12.7
. Hopkins Sanitlll)' Landfill
Methllne Glli:f Remediation Plall
staff will continue to work closely with the resident.s
to keep them abreast of monitoring results,
construction techniques, and the paca of the project.
Staff plans to hold neighborhood m.eetin,~s to carry out
this aim. The City's paramount concern i::.; to impress
upon the residents that there are no designs to destroy
the homes. U1 timate concern lies :In protecting the
people from danger to make Westbrooke safe.
o What is the proposed tiruetable?
November 6, 1990 Council approves project
plan and authorizes bids.
November 14 and 21, 1990 Adv~rtisement for bids in
Sailor
November 1St 1990 Neighborhood meeting
," November 29, 1990 Bid Opening
". December 3, 1990 Begin personal visits for
m~nitorin9 purposes
December 11, 1990 Council awards bids
December. 12, 1990 Neighborhood meeting
December 17, 1990 Winter construction
begins
January 25, 1991 Winter construction ends
May 1991 Spring Construction
begins on landfill site
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6800 SOI.llh TH.169, P,O. Box 39108 [DNlJI!!] _ ~/;!SeMre'$~ 1%'
Min,'1NJpolis, Minnosota 55439
Phona6121941.5600 f-ax: 6121942'4&l4
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September 25, 1990
Mr. Ken Meyer
Minnesota Pollution Control Agency
520 Lafayette Road North
St. Paul, MN 55155
RE: EG-839 LANDFILL GASES REMEDIATION PLAN
Hopkins SanitaIY Landfill
Dear Mr. Meyer:
This letter i-s in response to the September 6, 1990 meeting at the MPCA regarding the Hopkins
landfill. The following enumerated points put forth the City's plans for implementing remedial
action regarding methane migration. It al&c proposes dates for submitting further documents and
plans relative to decomposition gases remediation.
. 1. In response to discussions with the MPCA regarding the uncertainty and importance of
the gas generation rate to the design and performmce of a recovel)' system, the current
designs were peer reviewed by a national expe;tt (see attached resume).
2. The peer J."eview findings indicated that because the landfUl has been closed for
approximately 10 years1 ,is relatively shallow and largely above natural grade. and is 3mall
in size, it wBl not be po..<;sible to maint.ain an effective gas concentr~tioD. for flare
combus:ion. Whereas methane generation in 1980 (t~rmr."lation date) was estimated to
be approximately 85 to 200 cubic feet per minute (cEm); generation currently is e:stimatl"'..d
to be 45 to 95 cfm. By the year 20001 it is e:sthnated the generation rate v.>ill be bet'Ncen.
21 and 37 cfm. Methane comhust5-O!l studies indicate that ~n impractica! amount of
natural gas would need to be blended into the recovered, landfill gas to :maintain
combustien.
3. Given the above situation; an f!'.lternate approach to addre:85 the current r.lsk situation and
to potentially comply with the boundary limits for meiliane concentrations as s!;\: farth in
the solid west0 ruleJ is proposed. 111C City proposes to excavate <1 trench to the water
table; along the eastern and sou~hern portions of the landfili (see attached map). A
~etic methane barrier would 00 emplaced from tbe land surface to the wolter table.
Waste from the trench area as well as WMt\: cutside the barrier would be redeposited in
low areas within lbe intericr of the site. It is anticipated that the trench togeilier with
tbe waste excavation wdl alleviate the immt':diat~ safety (;<.'1ocem near the Wesi~rooke
homes.
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Offl!:as in Mirn'l$SOla. Wisconsin. 1IIinCJis, North DBhDtIf and Mootana 0
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. EG-015
Minnesota Pollution Control Agency ,.., September 25, 1990
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4. Because or d&:repancies in earlier i.llformation regarding the northern boundary of the
landfill. additional monitoring weUs will be installe.d ill this area to evaluate whether
boundary non-compliance is oc-curring. Proposed well locations are shown on the
attached map.
5. Because the end of the current construction se3SOr! i.c; approaching quiclcly,. it i... unlikely
that the entire batrier propo;:ied can be emplaced this :y~ar. Howevert excavation of the
waste and backfill with natural soil could be accomplished this year. As soon as possible
during the 1991 construction se~on, natural soil backfille-.d this year will be r~moved in
the trench location to allow emplacement of the:: barrier.
6. Monitoring of the Westbrooke homes ~ing both a1a.rms suppJemented 'With r.egular visits
to the homes with an explosimeter, '^tfi1 begi.n ~ soon as possible (see attacbed monitoring
plan). The City has alre!dy heg'..lU to make arrangements for tilese sensitive activities,
7. It is proposed that the site rind hom~ be monitored through 1991 and 8, final remedial
design for gas recovery/control for the landfill M a whole be submitted to the MPCA by
January 1992. By that time, ohse~"Iable changes in gas migration ~ffected by the barrier.
can be factored into the fimd design. Furthemmr~, re.gulato;:y requirements related to
. landfill gas emissiom may be hett'.'~r defined su:;h that the final design can be stru(:tured
to meet those requirements.
We are available to answer any qu~tions you might have regarding the above plan... nlC~ City
wiahes to present this plan to the City Council as soon as poMwle and therefore requests your
review in as timely a manner as possible.,
Very truly yours,
BRAUN ElW1RONl\.fENT AL LABORA.TORIF..s, me.
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Paula J. ro nea "-
Project Manager, Environmental Consulting SeIVices
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Mark B. Larson
Supetvisor, Waste Management Section
PJClMBL:ctw-21EO-015.Sep
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Jim Gessele, City of Hopkins ,.-,_,.'.<}11
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Dick Nowlin, Doherty Rumble &. .Butler ::'"
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Mark Z8ban, Hennepin CoUDty ~ ';,~~~.
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RONALD J. lOFY, PH.D.t P.E.
. Vice President/Principal
Education
B.S. in Civil Engineering from University of Wisconsin, Madison
M.S. in Sanitary Engineering from University of Wisconsin, Madi~on
Ph.D. in Sanitary Engineering with MinQr in Chemiccl Engineering from
University of Wisconsin) Madison, 1971
Prof~ssjonal R~gij~r9tion!
California: R.C.E. No. 24866, 1915
V"irginia: R.t.E. No. 9781, 197'7
Colorado: R.C.E. No. 20014, 1982
Indiana: R.C.E. No. 19771, 1982
prof~ional Affiliations
American Society of Civil Engineers
ASCE Water Treatment Sludge Dew~tering and Disposal Ta~k Conmittee
American Water Works Asso~iation
Water Pollution Control Faderation
~ational Solid Waste Management Associa~ion
NSWMA Chemical Waste Committee
Sigma Xi
. frqf,ssjoQj]_Experj~n~e
Dr. lofy has over 17 years of 1 andfi 11 experi efiee and has des i gnad)
supervised construction or recommended operational modifications at sev~
eral dozen landfills in Caiifornia and in other states. He has also
been retained as &n exp~rt witress in lundf111 litigation and frequently
makes technical presentations on landfill design Pf4ctices and remedial
actions. Dr. lofy has or currently serves on several landfill policy
advisory cOmlittees, such as NSWHA and SRCDA. He is a frequent speaker
at technical meetings and is a founding member of GRCDA's GiS Management
Committee.
As Director af Environmental Engioaering for Lockman & Associates~ Or.
Lofy coordinated projects wh~ch developed new technical solutiuns to gas
manageme\1t prtiblems at California hndfi1ls. He directed engineering
work which resulted in several of the first pioneering 1andfi11 gas con.
trol systems. He ha5 also designed several innoy~tive contrnl systems
that meet extremely stri ng\!nt air Qua;; ty >>~equh'ements.
Dr. Lofy was coordinator and coa~thqr of th0 U,$. EPA guidance document
"Recovering, Prote~s1n9, and Utilization of Gas From Sanitary La~dfillsD
(EPAf600/2.19~OOl) which described for the first ilme~ the design ele-
ments of landfill gas ffiani~ement systems v Ha has also performed land-
fill gas research for the U.S. Department of Enargy and Argonne National
laborattlry.
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Ronald J. Lofy, Ph.D.. P.Ev (canL)
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Or. lofy's professional activities include the following:
- Involvement in the fir3t ever medium-BTU gas plant
- Reeva 1 uat i on of 1 andfi 11 operation and techn i ca 'I ass i stance to
Getty Synthetic Fuels (GSF) ragarding landfill gas collection en-
hancement
- Preparation of the civil engineering design elements for the GSF
second generation pipeline quality gas extraction and compression
faci1 ity
- Building of the first mobile landfill gas pumping and test burn
system
- Conduct of field research for Argonne National LaboratDry on land-
.fill gas well design, zone of influence. and temporary storage of
gas in a landfill
.
- Des i gner' of the 1 andfi 11 gas co 11 ect i on systems and conceptui 1
design of the first two commercial landfill gas-to-electrical-
ene"gy facilities in the United States
. - Development of the first operating air-dike s,ystem for controlling
offsite migration of landfill gas
g Specifications preparation for protecting c~mmercial and residen-
tial developments from the danger~ of migrating landfill gas
Dr. lofy has also been retainer by site owners to provide peer review
and oversight of projects being developed by other firms. He also is a
guest lecturer in the solid waste ~anagement training programs offered .
by the University of Wiscons1n. He 1s certified in CPR and First Aid
from the American Red Cross,
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. MONITORING PLAt"I
FOR WESTBROOF..E PATIO HOMES
Due to the concentratioD}) of methfne found in the gas monitoring wells at the landfill and
particularly in tl1e wells along the WestbnAlke Patio Homes, the City of Hopkins will provide
monitoring of those homes along the eastern edge of the landillI. A bri,~f description of the type
of monitoring that will be performed is described below.
Monitors win be placed in the homes IQC:lted along the eastern edge of the landfill. 1he monitor
wiH be placed in a room on the lowest level of the home. The monitors will be set to alarm at
20% of the lower explosive limit (LEL). The inhabitants of the homes will ~ informed to vacate
the premises if the aliillD has sounded and to contact the City Fire Departm{";nt.
In add!tion to the monitors placed in the bomes, CitY?Cr8onne! or representatives of the City will
periodically go into the homes, assuming penniss\on is grantee!-. from the homecwners~ to measure
le....els of methane wi!h an explosimeter. 'This will ::etve ,as a -;heck on the alarm.'\, Monitoring
in this fashion m1! be performed once every two W'eeks for an initial two-month period.
Subsequent monitoring will be perfo!"Jled or;. a monthly basis.
Monitoring of the gas monitoring wells at the landfill wHl be continued on a monthly ba.s~.
. Monitoring of the homes is currently anticipated to continue until landfill monitoring indicates
that saf~ty concems have been alleviated.
Reports will be provided to th~ ,Minnesota Pollution Contro! A.gency on a q'LW1e;rIy basis. The
repo,\'t5 will include results from the monitoring of the gas monitoring welb as v.-ell llS re:sulu from
monitoring inside the homes. Any instances of an alarm beL"!! sctivated which bu b~ reported
to the City will also be reported to MPCA in the quarterly reports.
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. CITY OF HOPKINS
Hennepin County, Minnesota
RESOLUTION NO~90-13~
RESOLUTION APPROVING PLANS AND SPECIFICATIONS, INSTALLATION
OF GAS METHANE MONITORSt PROJECT 90-16, Awn AUTRORI2ING THE
ADVERTISING POR BIDS
WHEREAS pursuant to Council authorization, plans and
specifications for the inf:Otallat:lon of methane
monitoring devices in the Westbrooke Patio Homes
have been prepared by Braun Environmental
Laborat.ories and they have pr2f'iented such plans
and specifications to the council tor approval,
NOW THEREFOP~f BE IT RESOLVED by the city council of
Hopkins, Minnesota:
1. Such plans and specifications, a copy of which are
attached hereto and made a part hereof, are hereby
approved and ordered placed on filG in the office
of the City Clerk.
2. The Cit.y Clerk shall prepare and cause to be
. inserted in the official paper and in the
ConlLtructiQn Bulletin an adv~!'tise:ment for bids
upon the making of such improvement under such
approved plana and apecifications cations. The
advartisemu-:mt, shall be published twice, at least
ten days bEfore date set for bid opinin9t shall
specify the work to be done, shall state that bids
will be received by the clerk u.ntil 10:00 a.m., on
the 19th day of Novemb~r, 1990, at the City Hall
and that no bids shall be considered unloas sealed
and flIed wit.h the clerk and a-:::companied by a
certified ch~ck or bid bond, payable to th~ city
of Hopkins, Minnesota for 5% of the amount of such
bid.
3. The Clerk and city :e:ngi.ne.gr are hereby authorized
a.nd instru.cted to receive~ open, and read e.loud
bids received at. the time and place herein noted,
and to tabulat.e the .bids received. The Council
will consider the bids, and t.he aWc,rd of a
contract ~ at the regular city Council meeting of
Decembsl' 11 t 1990, ,in the Counci 1 Chamb~rs.
Adopted this 6th day of November; 1990. .
. ~-'--Nels()n W:- Berg, Mayor
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',',-, ATTEST:
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~:'!? James--A~Genellie, city clerk
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. CITY OP BOPXIN8 I
Hennepin county, Hinn.sota I
RESOLUTIOM NO.90-131 I
RBBOLUTXON APPROVING PLANS AND aPECI~ICATIONS, INSTALLATION II
OF LANDFILL GASES RBKBDIATION PLAN, PROJECT 90-18, AND
AUTHORIZING THB ADVERTXSING POR BIDS 1
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WHEREAS pursuant to Council authorizat.ion, plans and i
soecifications for excavation of off-site landfill I
and placemen'': of a synthetic methane barrier at I
the 7th street landfill site have been prepared by
RCM Associates, Inc. and they have presented such
plans and specifications to the Council for
approval,
NOW THEREFORE, BE IT RESOLVED by the City council of
Hopkins, Minnesota:
~. Such plans and sp.ecifications~ a copy of which are
attached hereto and made a part hereof( are hereby
approved and ordered placed on file in the office
of the City Clerk.
2. The City Clerk shall prepare and cause to be
~ inserted in the official paper and in the
Construction Bulletin an advertisement for bids
upon the making of such impro1ls1t'tent under such .11
approved plans and specifications cations. The I
advertisement shall be published twice f at least I
ten days before date set for bid opining ~ shall I
specify the work to be donet shall state that bids 1
will be received by the clerk until 10:00 a.m., on;jl
the 29th day of November, 1990, at the city Hall .
and that no bids shall be considered unless sealed I
and f ilea with the clerk and accompanied by ai
certified check or bid bond, payable to the City!
of Hopkins, Minnesota fer 5% of the amount of such ~
bid. ~
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3. The c~erk and city Englneer are hereby authorized ,,~J
and .lnstructed to receive, open, and read al0Ud"::;~1
bids received at the. time and place herein neted",
and. t.o tabulate the bid~ received.. The council.'.:,
will consider the bids, and the award of a ,/J
oontract ~ at the regular City Council meeting Ofl
December 11, 1.990, in the Council Chambers. '1
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Adopted this 6th day of November, 199Q. ;)
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;~. ~ Nelaon W. Berg, Mayor ";,;~
ATTEST:)~
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Sam.es A Ge:neIIlei city Clerk ,.V'
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