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Home > Ag Chemicals & Fertilizers > Spills & Safety > Incident Response Unit > Guidance Documents > Remedial Investigation Work Plan (GD9) > Attachment 1 - Form and Content of the Remedial Investigation Work Plan

Guidance Document 9 - Remedial Investigation Work Plan


Attachment 1 - Form and Content of the Remedial Investigation Work Plan

The following is a general framework for RI work plans. Additional site specific information should be included where appropriate. The report should be referenced where appropriate and be thorough but concise.

Introduction

  • the purpose for the investigation
  • when and by whom the work was authorized

Scope of Work

  • description of services to be performed at the site

Phase I Report

  • see ASTM E 1527, MDA Site Files

Site Description

  • soil type(s)
  • estimated depth to ground water
  • anticipated regional ground water flow direction
  • anticipated hydrogeology
  • topography
  • list of references

Sample Collection

  • sample locations and rationale (locate on site map)
  • soil sample plan (types and depths)
  • number of borings to be completed
  • number of samples to be collected
  • ground water sample plan
  • number of wells and locations (locate on site map)
  • sample analysis parameters
  • field screening methods, supporting documentation and how they are to be used
  • sample analysis plan describing which samples will be analyzed and which will be held frozen
  • borehole abandonment methods

Sample Collection Procedures (consult guidance documents for details)

General:

  • sampling equipment
  • equipment decontamination methods
  • sample storage, containers, transport, preservation, handling and chain of custody

Soil:

  • drilling method and borehole diameter
  • sample intervals (analytical and lithologic)
  • how samples will be collected
  • lithologic classification methods
  • sample type (composites, discretes)
  • how and when samples will be split

Ground Water:

  • water level measurement
  • well stabilization
  • how samples will be collected
  • decontamination and QA/QC procedures
  • sample preservation

Surface Water:

  • permanent sample location and depth
  • how samples will be collected and characterized

Field Screening Methods

  • how and when they will be used
  • procedures for use
  • detection limits
  • percent fixed laboratory confirmation

Analytical Laboratory

  • name of laboratory performing analysis (must have QA/QC and analytical methods approved and on file with MDA)
  • sample holding time
  • approximate sample turnaround time

Well Drilling and Installation Methods

  • well locations and explanation of location selection
  • sampling interval
  • construction methods (drilling method, well diameter, screen length and placement, well protection)
  • construction materials (screen and riser materials, filter pack and interval, seal materials)
  • compliance with MDH Water Well Code
  • collection and disposal of cuttings and purge water but only when sampling highly contaminated soil in public areas
  • well development
  • equipment decontamination
  • well abandonment procedures

Maps

  • topographic map with site location indicated (adapted from USGS quads)
  • soil map and legend, if available
  • site map showing all permanent structures (labeled), high risk areas and proposed sampling or well locations
  • outline of investigation areas, approximate boring locations and well locations

Contamination Impacts Survey (see Attachment 2)

  • how and when it will be conducted

Work Schedule

  • proposed timetable for work to be performed

Costs

  • outline of costs associated with proposed work

MDA Contact

651-201-6455
Fax: 651-201-6112
Pesticide & Fertilizer Management Division