8202_SampsonCoMSWLF_20160617_PermitModReduceLeachateTank_DIN26281

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2
6/17/2016

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DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2
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DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

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DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2

DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2
DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2
ADDRESS TEL WEB
PROJECT SHEET 1 OF 10 DATE
COMPUTED BY
SUBJECT JOB # CHECKED BY
OBJECTIVE:
REFERENCES:
ASSUMPTIONS:
ANALYSIS:Step 1:
Step 2:
Step 3:
Step 4:
Step 5:
Step 6:
Results:See attached spreadsheet and HELP Model output.
Determine the average 7-day leachate generation rate for each condition evaluated. Use
average daily rates as predicted by the HELP Model or assume emprical generation rates.
Multiply peak seven day storage volume by the number of acres of active, intermediate, rain
cover, and closed areas to obtain the peak seven day leachate generation for each condition
evaluated.
Determine the peak monthly leachate generation rates for active, intermediate, and closed
areas using the HELP Model over a period of 5+ years.
Take the peak monthly leachate generation rate, divide by 30, and multiply by 7 to obtain the
anticipated peak seven day flow (gallons per acre) for active, intermediate, and closed areas.
Adjust rain cover and intermediate area to reduce stormwater penetration and help size the
necessasry storage.
Assume “typical” operational conditions for each Phase (i.e. various areas of active, intermediate, and/or
closed areas).
Schroeder, P.R., Lloyd, C.M., et. al, (1994), “The Hydrologic Evaluation of Landfill Performance (HELP)
Model - User’s Guide for Version 3,” EPA/600/9-94/168a, USEPA Risk Reduction Laboratory, Cincinnati,
Ohio.
Schroeder, P.R., Lloyd, C.M., et. al, (1994), “The Hydrologic Evaluation of Landfill Performance (HELP)
Model - Engineering Documentation for Version 3,” EPA/600/9-94/168b, USEPA Risk Reduction
Laboratory, Cincinnati, Ohio.
6/10/2016
ALK
Subtract available storage and disposal capacity to determine if additional storage/disposal
capacity is needed for each condition evaluated.
Leachate Generation Evaluation SAMPSON-13-6 SAS
To predict leachate generation rates to determine the required leachate storage/disposal capacity
requirements.
14 N. Boylan Avenue, Raleigh, NC 27603 919.828.0577 www.smithgardnerinc.com
SCD MSW Landfill - Phase 3
SMITH GARDNER, INC.LEACHATE GENERATION (7 Day) RC SG.xls
DocuSign Envelope ID: 15D834FF-C8A7-4A0D-8FC6-3BB12613B2E2
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LEACHATE GENERATION (7 Day) RC SG.xls
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