- 1. 23rd Annual NARPM Training Program Locational Data and Site
Data Management Robert M. Alvey Geologist R2 ERRD/PSB Technical
Support Section
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. 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. 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. 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.
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.
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. 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.
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.
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. 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. 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. 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. 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 Forums fact sheet, Electronic Data
Deliverables: The Importance of Receiving Your Site and Project
Data Electronically, provides supplemental information. 2011 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
