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~COI"!Yl'\efCOCJISheet Mcnches1er. NHIJSA03101 -1113 1818()110n8(603)668-o880 fOJ(603)668·11QQ

March 8, 1996 Projt!

Mr. Roger Duwart 923-6058 Coakley Landfill Superfund Site -2- March 8, 1996

• gas.migrit iOI\monitoring prohes located around the perimeter of the landfill which will be monitored on a regular basis.

Calculations supponing the design of the gas coll

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; ~

Mr. Roger Duwan 92HiOS8 ~ z

Coakley landfill Superfund Site March 8. 1996 . 0 ~ ... ; = m

Cost CompwjWn· < " 2.

A comparison of the costs for active gas collection and treatment and passive gas collection and venting was compleced. The comparison included capital costs as well as long term (30 year ~ post closure period) operuion and maintenance (0&M) costs

~ The following summarizes the capital and O&M cost estimates respe..:tively for the two types ~~~ of systems: ,z,

g~~ z~

GuVenu I so.ooo

Gu Collection Layer s480,600

Additioft&l Refuse Eacavation s ]7,700 = Reductioa in Grldina: Fill lllliJ!IQl = TOTAL: 1339,SOO =

OAM Cow CPuarm Worth 71 Imcn;st No lnO atjonl

Active Gu Collection and Treatment 1360,600

Pwive Gu Collectkm and Treatment s40,200

Rued oo the&e cosu, the combined capital and O&.M cost comparison is as follows:

Active System 1686,000 1360,600 $1 ,046,600

Pwive System UlUll!l L.l12.1ll!l= Difference 1346,SOO $320,400 I 666,900

M shown, 1 sicnificant pon ion of the cost savincs are associated with lona term O&.M costs . The calcullled O&.M costa for the active JIS collection and tieatment system are considered to be conserv.aively low. Actull costs uvinas associated with the passive au collection and ventina system could be sicnificantly hi&her than calculated .

...,_..........

= Mr. Roger Duwan 923-()()S8 Coakley Landfill Superfund Site -4- March 8, 1996 ;:z

~0 i::! • n ~ m

Based o n a review of landfill closures in New Hampshire, it is concluded that passive LFG gas collection and ventina is an effective means of connolling LFG migration from closed landfill facilities with FML caps . Implementatio n of pass ive LFG collectio n and venting at the Coakley landfill will result in combined capital and O&M cost savings of approximately $700,000 through the closure and post closure period as compared 10 active LFG collection and treatment .

Should you have any questions or require addi tional information, please do not hesitate to cal l.

Very truly youn,

GOLDER ASSOCIATES INC.

Aliltair P .T . Macdonald , L.SP Projea Director and Associate

APTM!Ijl

Encloou•• T. Hubbard, NHDES T. Roy, Ari•

Coakley Technical Comminee

Coakley Executive Comminee

--

0

,-

TABLE I ---. NEW HAMPSHIRE LANDf1 LLS

CWSED Willi PASSIVE GAS COLLECTION AND VENTING SYSTEMS

FACILITY YR . CLS R. YR . CLS R. YR . CLSR . SIZE CAP TYPE DESIGN CNSTRTN. CNSTRTN (ACRE)

APPROVED BEGAN COMPLT . Franklin 1985 1l HOPE/Clay Derry 1986 6.5 PVC Plaisww 1987 14 Clay

1988 7 Clay"" 1989 HOPENew Boston 4 Andover 1989 2.3 HOPE Laconia 1989 1989 1990 HOPE Weare(P1'2) 1989 1989 1990 2.8 HOPE

1991 1991 1991 4 HOPE =.... 34 1989 1991 199 1 14 HOPE""""'•laffiev 1m 1m 1992 II HOPE

New London 1991 1992 1992 3.5 VLD PE P....t>oro 1991 1992 1992 4 HOPE

1m 1993 1993 8.5 HOPE S~bbouy 1m 1993 1993 1.2 HOPE Windlllm 1994 2.7 HOPE Ex- 1994 1994 1994 II VLOPEIHDPE SIMibumo 1994 1994 1994 1.2 PVC Wbltofttld 1994 6.0 VLOPE

lleoull-•

........ 1994 1994 1994 3.5 VLDPE

Morlboro 1994 1994 1994 1.5 PS Alton 1994 1994 1994 1.2 Cia fVLDPE Ouipee 1994 1994 3.4 Till Froodom 1994 1994 1994 1.2 Till Effin..... 1984 1994 2 Till

HOPE • HiJb Density Polyethylene

VLDPE • Vrry Low Density Polyethylene

PVC • Pol.)'\'inyl Chloride

Till • to' Soil

PS • Ptper Sludae

• • Unavailable

From NHDES Waste Manq:emenl Divisio n

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APPENDIX G

PASSIVE GAS COLLECTION AND

VENTING SYSTEM

DESIGN CALCULATIONS

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EXPLANATION OF SIGNIFICANT COA 006d ue to the quaUt y o f the DIFFERENCES

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NOTICE

If the fll•ed i•a1e i& leu I COAKLEY LANDFILL SrTE clear than thh Nolice it h ADMINISTRATIVE RECORD

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