EPA NARMPA Locational Data and Site Data Management Presentation


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EPA NARMPA Locational Data and Site Data Management Presentation

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EPA NARMPA Locational Data and Site Data Management Presentation

  1. 1. 23rd Annual NARPM Training Program Locational Data and Site Data Management Robert M. Alvey – Geologist R2 ERRD/PSB – Technical Support Section
  2. 2. 23rd Annual NARPM Training Program 1 Location, Location, Location!  The primary criteria for value in real estate!  Location is a critical component for Superfund sites:  Property boundaries – physical and “groundwater”  Site features  Sampling locations  Reports  Site hydrogeology and risk assessment  Maps  Planning – RI/FS/RA/LTM, etc.  Communications
  3. 3. 23rd Annual NARPM Training Program 2 Location IS Data  Locational data is a key element of Superfund site  Inaccuracies in locations can cause:  Inaccuracies in maps  Inaccuracies in location and extent of contamination  Inaccuracies in monitoring well locations and screens  Inaccuracies in Site features  Inaccuracies in groundwater gradients  Inaccuracies in fate and transport modeling  Incorrect development of a conceptual site model  Inaccuracies are carried along through the project
  4. 4. 23rd Annual NARPM Training Program 3 Location, Location, Location??  “Location” consists of X, Y, and Z components  The Earth is NOT flat  Maps are projections of 3D surfaces onto flat surfaces  The components need to be referenced  Measuring system used and scale needs to be noted  “Metadata”  The locational data needs to be related to other data  Where the sample was collected  Where and what type of measurement was made  Date the data or sample was collected
  5. 5. 23rd Annual NARPM Training Program 4 Location, Location, Location  “X” and “Y”  Two points needed to locate a “surface” position  Horizontal datum: North American Datum of 1983 • NAD83-91 (a 1991 adjustment – Oregon, Idaho, Washington) • HPGN – High Precision Geodetic Network  Orientation – “North” or local benchmark  For projections onto a flat surface • Latitude and Longitude (EPA Preference) • State Plane Coordinates
  6. 6. 23rd Annual NARPM Training Program 5 Location, Location, Location  “Z” Elevation or Altitude  NGVD29 – National Geodetic Vertical Datum of 1929  NAVD88 – North American Vertical Datum of 1988  FBGS – Feet Below Ground Surface • Used primarily for field drilling or sampling to measure depths  NGVD29 and NAVD88 are based on mean sea level. NAVD corrected minor errors in NGVD  Note: Yes, sea level is changing.
  7. 7. 23rd Annual NARPM Training Program 6 Location, Location, Location  Accuracy  The accuracy of a measurement is the degree of closeness of measurements of a quantity to that quantity's actual (true) value.  Precision  The precision of a measurement is the degree to which repeated measurements under unchanged conditions show the same results (repeatability) A measurement is considered valid if it is both accurate and precise
  8. 8. 23rd Annual NARPM Training Program 7 Relational Data  Linking “locational” data to your site data:  Improves planning of field activities  Improves accuracy in maps and figures  Increases efficiency of drawing preparation  Improves planning and decision making process RPMs collect many sample analyses. Make certain to know WHERE they were taken.
  9. 9. 23rd Annual NARPM Training Program 8 Metadata  Spatial data having a description and documentation of its subject matter:  how, when, where, and by whom the data was collected;  availability and distribution information;  its projection, scale, resolution, and accuracy;  its reliability with regard to some standard.  Metadata consists of properties and documentation of the data itself.
  10. 10. 23rd Annual NARPM Training Program 9 Collecting Locational Data  Various tools and methods available  Survey, Aerial Photography, GPS, eyeball*  Each method has different accuracies and precisions  Documenting the method used is important  Metadata – helps refine locational measurements *Yes! Your eyeball IS a “valid value”. It may not be fully accurate or precise, but is useful.
  11. 11. 23rd Annual NARPM Training Program 10 Locational Data  Surveying – Plan with details  Bench marks: Local, USGS, etc. Referenced!  Wells: Critical to obtain precision and accuracy for measuring point elevations  When having additional survey done, make sure to obtain measurements at existing point(s) to have all elevations on same plane
  12. 12. 23rd Annual NARPM Training Program 11 OOPS 1  Navy site: NJ  Innovative pilot to use nano-iron injection  OU map with wells provided. Groundwater flow  Injections and monitoring.. NOTHING  OU map displayed on full base map revealed overall groundwater flow was in opposite direction  Look at the big picture before concentrating on small areas
  13. 13. 23rd Annual NARPM Training Program 12 OOPS 2  Fed Lead site: NY  Extensive monitoring well network  High level QA/QC for all phases  Survey* results indicated well elevations incorrect by 30 FEET  Hired USGS to resurvey to 0.001 foot precision  All reports and records have incorrect elevations  Note: Surveyor* was fully licensed and experienced.. In Pennsylvania
  14. 14. 23rd Annual NARPM Training Program 13 Locational Data Examples of Data to be Submitted Electronically Site Map: • Preference is for GIS layer file or computer-aided design (CAD) format with all relevant surface features; however, PDF or other file format may be acceptable. Boring Logs and Well Construction Details: • X, Y, and Z coordinates, and location ID. • Ground surface elevation, top of casing elevation, depth to lithologic units, lithologic descriptions, depth to well construction material, well construction material type, diameter of casing, drilling method, well development information, etc. • Field test data [e.g., photoionization detector (PID), field x-ray fluorescence (XRF), immunoassay, etc.]. • Aquifer slug test or pump test data. • Geophysical test data. Location Data: • X, Y, and Z coordinates. • Coordinate system and projection in use. Water Level Data: • Location ID and X, Y, and Z coordinates. • Depth to water. • Date and time of measurement. • Measurement equipment or system used. Note: Appendix to the Ground Water Forum’s fact sheet, “Electronic Data Deliverables: The Importance of Receiving Your Site and Project Data Electronically,” provides supplemental information. 2011
  15. 15. 23rd Annual NARPM Training Program 14 Locational Data  Important regardless of database software used  Anticipate changing technologies  Anticipate that someone would like to use your data  Incorporate locational requirements in Contracts Agreements and Orders  EPA is preparing updated guidelines for locational data