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DocuSign Envelope ID:9D837DE1-58E6-47AF-80AC-29E747EBFFCE <br /> Proposal for Above-Ground Landfill Gas Survey and Stream Sampling <br /> ..■■ _ Hillsborough Dump <br /> a� ID No. NONCDO000483 <br /> ls' <br /> Task Orders 483DP-4, 5 and 6 <br /> Addressing Pre-Regulatory Landfills and Dumps,dated November 2015, Guidelines for Assessment and Cleanup, <br /> dated October 2015,and S&ME's approved Standard Operating Procedures and Quality Assurance(SOP/QA) <br /> Manual(July 2010),previously approved by NCDEQ. <br /> Task 483DP-4 Work Plan/Proposal Preparation <br /> The following services were performed: <br /> a Developed a drawing to present the proposed boring locations. <br /> a Developed cost estimate spreadsheets. <br /> 0 Prepared field services schedule and task descriptions. <br /> 0 Prepared this proposal and work plan. <br /> Task 483DP-5 Above-Ground Landfill Gas Survey and Stream Sampling <br /> Subtask A Above-Ground Landfill Gas Survey <br /> Above ground landfill gas screening will be conducted on an approximate 100-foot grid pattern as indicated on <br /> the attached site map(Figure 1). Data will be recorded from an estimated 180 screening locations. The actual <br /> quantity and location of screenings may be adjusted in the field based on site observations and in effort to assess <br /> the smaller documented areas of concern (waste and fill areas). S&ME field personnel will also take photographs <br /> of vapor screening activities and site conditions/areas of interest (stream conditions,exposed partially buried <br /> waste,surface waste, and mounded,lhummocky topography) relevant to future assessment and eventual <br /> remediation of the site. <br /> The vapor screenings will be conducted as follows: <br /> • Ambient air will be screened at four or more background locations. <br /> • Bump tests will be conducted to verify proper calibration and instrument accuracy before, during, and <br /> after the survey. <br /> • Duplicate readings of at least one background and two screening locations will be conducted. <br /> • If a duplicate reading differs by 2% or greater,an additional screening will be conducted at the same <br /> location. <br /> • S&ME will use a GPS unit pre-programmed with the grid screening location name(i.e. 134) and its <br /> coordinates to field-locate each screening point. The field crew will locate each screening point and <br /> conduct limited vegetation clearing if needed to reach the screening points. <br /> • Three meters wiil be used to collect vapor data at each screening point. <br /> o Landfill Gas Meter—GEM5000 PLUS(or equivalent)for: methane, hydrogen sulfide, oxygen, <br /> carbon dioxide and barometric pressure <br /> o Mercury Analyzer-Jerome 431X Mercury(or equivalent)for mercury <br /> o Photo-lonization Detector—MIniRae 3000 PI (or equivalent)for total VOCs <br /> November 6, 2018 2 <br />