January 2013

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(.zip file with Shapefile and ArcGIS 9.3 LYR)

Overview

The Massachusetts Department of Environmental Protection (MassDEP) Underground Storage Tanks datalayer is a statewide point dataset containing the locations of facilities having one or more underground storage tanks. 

Effective July 1, 2009 MassDEP began implementing federal requirements addressing the registration and inspection of Underground Storage Tank (UST) systems used to store petroleum fuels or hazardous substances.  UST Facility locations were field-verified &/or mapped using digital orthophotos and parcel data.  The layer is stored in ArcSDE as BWP_PT_UST.

Source

Data Universe
In 2010, MassDEP undertook a field verification project to clarify the universe of Underground Storage Tank facilities and confirm their locations.  Using the Underground Storage Tank database acquired from the Dept of Fire Services (DFS), a list of “active” underground storage tank facilities was generated.  Facilities without previously confirmed locations* were address-matched to create a “development layer”.  Digital orthophoto-based site maps were created using the best available location for each facility.  MassDEP staff brought these site maps into the field to confirm or improve mapped locations.  The data are current as of January 2013.

Data Sources
The primary sources of information for this datalayer include:

  • Field verification by MassDEP staff
  • Site-specific knowledge of BWP Compliance and Enforcement staff
  • Surveys, site plans and locus maps from MassDEP records
  • Interpolation of orthophoto imagery and parcel data from MassGIS

* Links in the Related Information section of this document contain additional information regarding previously confirmed locations and other data sources utilized in the development of this datalayer.

Production

Point Development Tool
To facilitate conversion of institutional knowledge and paper data to a digital format, the MassDEP GIS Program created the Point Development Tool (PDT), a customized application using ESRI’s ArcGIS software.  The PDT provides a standardized platform that guides users through the automation and documentation of geographically referenced point data.  MassDEP GIS and technical staff used the PDT to locate facilities based on knowledge gained in the course of their professional activities.  On screen digitizing using the PDT was the primary method of automation.

Basemap Scale
Using data in the “development layer” the PDT navigates data developers to the general vicinity of a site.  The PDT then displays the best digital base imagery available for that vicinity.  Half of the facilities in this UST layer were mapped prior to the 2010 field initiative.  Many of these locations were based upon earlier PDT mapping efforts.  In 1998, the PDT used MassGIS 1 meter (1:5,000) black and white digital orthophoto images (DOQ) as the default basemap.  Where 1 meter 1:5,000 DOQs were not available, the PDT defaulted to 1 meter USGS (1:12,000) black and white digital orthophoto images or (1:25,000) USGS topographic quadrangle imagery respectively.  When PDT data development began, the only available digital basemap imagery for much of Massachusetts was the MassGIS scanned USGS (1:25,000) topographic images.  Therefore, the base scale of this datalayer is considered to be 1:25,000.

Other Methodologies
In the absence of field verification or staff with professional knowledge, facility files were checked for location information.  Facility files maintained by MassDEP contain a variety of types and quality of maps, including surveys, site plans and locus maps.  MassDEP GIS and BWP Program staff reviewed this file information and identified the best manuscript maps and supplemental text information for locating UST facilities.  Locations were entered using the PDT.  With multiple years of orthophoto imagery and the increased availability of parcel data, many recently mapped locations were developed without the need for field verification.

Attributes

1. Attribute Data Structure
The point attribute table for the MassDEP BWP Underground Storage Tanks datalayer contains the following fields:

General Facility Information Fields:

FIELD TYPE-WIDTH DEFINITION
FAC_ID Long Integer Facility ID from Facility Master File (FMF) Database
FAC_NAME Text - 45 Facility Name from FMF Database
ADDRESS Text - 38 Facility Address from FMF Database
TOWN Text - 21 MassGIS town name
REGION Short Integer MassGIS DEP Region code
USTID Long Integer Underground Storage Tank ID

2. Description of General Facility Information Fields
General facility information attributes are populated using MassDEP‘s Facility Master File (FMF) Database.

a. FAC_ID
Facility ID from MassDEP‘s Facility Master File (FMF) Database. The FAC_ID is a unique identifier used in the FMF Database to identify facilities and their ownership.

b. FAC_NAME
Facility name from the FMF Database.

c. ADDRESS
Number and street address of the facility, as listed in the FMF Database.

d. TOWN
The standard MassGIS town name.

e. REGION
A code corresponding to the MassDEP Region in which the facility is located. This field uses standard MassDEP Region codes:

REGION DEP REGION – Office location ACRONYM
1 Western Region – Springfield WERO
2 Central Region – Worcester CERO 
3 Northeast Region - Wilmington NERO 
4 Southeast Region – Lakeville SERO 
f. USTID
a.k.a. Dept. of Fire Services (DFS) Facility ID:  Unique identifier for a UST “facility” which may include one or more underground storage tanks.  Provides a link to UST Program databases accessible via http://www.mass.gov/dep/toxics/ust/index.htm.

Related Information

MassDEP Location Documentation Table: (BWP_MAJ_LDT) - See DEP Standards for Point GIS Data .

MassDEP Underground Storage Tank Program Query Tool: http://public.dep.state.ma.us/UST/ustQueryPage.asp The entire MS Access database can be downloaded here or information for individual tanks can be queried. 

Other MassDEP-regulated facilities available as point features – See MassDEP BWP Major Facilities and the "Spatial Views: Solid Waste Operations other than Land Disposal" section of the MassDEP Land Disposal of Solid Waste Datalayer .

Maintenance

The MassDEP Underground Storage Tank datalayer is maintained by the MassDEP Bureau of Waste Prevention. A regular update schedule has not been determined at this time. Updates may include improvements to mapped locations, clarification re: multiple tanks at a given facility and/or the location of facilities not included in the datalayer at this time.

In January 2013, the location of 3,925 features represents 98% of active Underground Storage Tanks.

If you have questions regarding this datalayer, please contact the DEP Bureau of Waste Prevention at (617) 292-5694.


Last Updated 3/14/2013