Solid Waste Services

HLW Engineering Central IowaSolid Waste Management

As the Engineer of Record for seventeen Iowa Solid Waste Management Agencies, Counties, and Cities, HLW Engineering has been involved in all aspects of project planning, budgeting, and financing for a wide variety of solid waste management activities.  These activities are primarily regulated under Administrative Code 567- Chapters 113, 114, and 115, and Code of Federal Regulations 40-CFR-258.  We strive to work with our clients to ensure that all our projects meet or exceed applicable regulatory requirements.  HLW Engineering is very experienced working within the IDNR solid waste regulations.


  • Permit renewals
  • Capital Improvements Planning (CIP)
  • Air-space management
  • Emergency response and remedial action plans (ERRAP)
  • Storm Water Pollution Prevention Plans (SWPP)
  • Spill prevention control and counter measures plan
  • Inspections and reporting
  • Groundwater quality assessment plans/site remedial action plans
  • Contract landfill operations
  • Alternate Daily Cover (ADC)
  • Operator training

Comprehensive Planning

  • Regionalization/Waste Shed Analysis
  • Subsequent electronic updates
  • Source separation & materials recovery for recycling/reuse
  • Construction/Demolition (C&D) Recycling
  • Composting/co-composting
  • Transfer stations/transfer haul

Development, Operating Plans, and Specifications (DOPS)

  • Hydrogeologic investigations
  • Land acquisition assistance

Closure/Post Closure Plan

  • Flexible membrane closure cap
  • Alternative closure cap
  • Post closure monitoring and reporting
  • Financial assurance calculations

Gas Monitoring System Plan

  • Explosive gas monitoring and reporting
  • EPA Mandatory Reporting Greenhouse Gas Modeling
  • Gas collection and ventilation

Sanitary Disposal Project Siting

  • Iowa Code Section 455B.305A compliance
  • Alternative closure cap
  • City/County Zoning
  • Conditional Use Permit

RCRA Subtitle D Liner Systems

  • Composite flexible membrane liners (FML)
  • Alternative Liner Performance
  • Evaluations and design

Hydrologic Monitoring System Plan

  • Monitoring well siting and construction
  • Groundwater sampling and annual reporting
  • Groundwater quality risk assessment/remediation
  • Monitoring well re-evaluation

Leachate Control Plan

  • Surface water management
  • NPDES Permitting/Monitoring
  • Groundwater diversionn
  • Collection systems
  • Leachate Storage –Lagoons/Tanks
  • On‑site treatment and discharge-NPDES permitting
  • Pretreatment & conveyance to POTW’s
  • Leachate Treatment Agreements
  • Leachate Recirculation
  • Leachate control system performance evaluations

Construction Administration

  • Bid Documents, Plans and Specifications
  • Bidding assistance
  • Construction contract administration
  • Construction observation/staking
  • Quality Assurance/Quality Control testing and reporting
  • IDNR Certification
  • Record drawings