wells

Identification Information

[smtype]

Citation Information

Originator	Maine Department of Human Services (MEDHS), Drinking Water Program (MEDWP)
Publication Date	200404
Publication Time	Unknown
Title	wells
Geospatial Data Presentation Form	vector digital data
Series Name	Source Water Protection Area (SWPA)
Issue Identification	Maine Public Water Supply
Publication Place	Augusta ME
Publisher	Maine Office of Geographic Information Systems (MEGIS)
Other Citation Details	1:24000 WELLS contains point locations for Maine's over 2500 wells and springs serving public water supplies.
Online Linkage	http://megis.maine.gov/catalog/
[smcilnkh]	true
[smcisrcs]	24000
[smcisrcm]	online
Beginning Date	19910101
Beginning Time	Unknown
Ending Date	20020830
Ending Time	Unknown
[smcisrcc]	ground condition

Abstract

WELLS consists of point data, each representing the location of a public water supply well in Maine. The records are current as of June 2003, to the best of Maine Drinking Water Program (MEDWP) recorded knowledge. Data was collected by differentially corrected GPS from 1994 to 2003 and includes public water supply (PWS) wells statewide. Additional source data is available on tables that can be linked to this base data.

Purpose

This dataset was developed for use by the MEDWP and other entities. Its primary purpose is to assist in management of spatial information about PWSs, in compliance with the federal Safe Drinking Water Act as Amended 1996 and 22 MRSA Chapter 601. Detailed design decisions may require additional location data. Field verification of location, ownership, and other attributes is strongly recommended. The dataset was developed by the Maine Department of Human Services, Drinking Water Program, with logistical and financial support from U.S. Environmental Protection Agency (USEPA).

Time Period of Content

Beginning Date	19910101
Beginning Time	Unknown
Ending Date	200310
Ending Time	Unknown
Currentness Reference	ground condition

Status

Progress	In work
Maintenance and Update Frequency	As needed

Bounding Coordinates

West Bounding Coordinate	-70.96842
East Bounding Coordinate	-66.89888
North Bounding Coordinate	47.33493
South Bounding Coordinate	42.98513

Keywords

Theme	infrastructure, public water supply, wells (Maine GIS Thesaurus-Theme)
Theme	health, environment, inlandWaters, structure, planningCadastre, utilitiesCommunication (ISO Keyword Thesaurus)
Place	Maine, United States (Maine GIS Thesaurus-Place)
Stratum	hydrosphere, human dimensions (GCMD Parameter Keyword)

Access Constraints

These data are freely available for use; however, the data set should not be redistributed without permission. Please see Maine Office of Geographic Information Systems (MEGIS) License Agreement at http://megis.maine.gov/ . Any secondary distribution must have this documentation appended.

Use Constraints

Detailed design decisions may require additional locational data. Field verification of location, ownership, and other attributes is strongly recommended. Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002, and coordinated by MEGIS

Contact Organization

(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program

Contact Position

Manager Source Water Protection

Address Type

mailing address

Address

State House Station 11

City

Augusta

State or Province

Postal Code

04333-0010

Country

USA

Contact Voice Telephone

(207) 287-6196

Data Set Credit

Dataset developed by Maine Drinking Water Program, with logistical and financial support from USEPA. Credit should always be given to the data source and/or originator when the data is transferred or printed.

Native Data Set Environment

(MEDWP) Microsoft Windows 2000 Version 5.0 (Build 2195) Service Pack 2; ESRI ArcCatalog 8.2.0.700; Maine Office of Information Technology (OIT) Oracle 9i, Maine Office of Geographic Information Systems (MEGIS), Maine GIS SDE, Maine GIS Internet Data Catalog http://megis.maine.gov/catalog/

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WELLS

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state

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Attribute Accuracy Report

Attribute data are extracted from the State Drinking Water Information System (SIDWIS). Although this information is updated and checked for quality purposes on a regular basis, there are errors in the data. Supplies may be used seasonally, and may not be active. Supplies may go off-line, or be abandoned and the MEDWP may not be informed of their change in status. Additionally, the ownership of some PWSs changes over time, and should be checked for currency.

Attribute Accuracy Value

good

Attribute Accuracy Explanation

Most attribute data is correct, but there are some data entry errors. Some information is based on owner's recollection, or may not be current.

Logical Consistency Report

Data set meets "Data Standards for Maine Geographic Information Systems" (June 2002).

Completeness Report

The data set is complete.

Horizontal Positional Accuracy Report

GPS data were differentially corrected using Trimble base station data. Accuracy of the well locations which were collected by GPS can range from 1 cm to over 100 meters depending on the number of satellites in view, the position of satellites in relation to each other, the strengths of the satellite signals and the distance of the base station from the GPS receiver. Geoexplorers typically provide accuracy ranges of 2 to 5 meters.

Horizontal Positional Accuracy Value

Horizontal Positional Accuracy Explanation

GPS data for well locations were differentially corrected using Trimble base station data. Parameters set for MEDHHS GPS collection Geoexplorers typically provide accuracy ranges of 2 to 5 meters.

Citation Information

Originator	Maine Department of Human Services (MEDHS), Drinking Water Program (MEDWP)
Publication Date	unpublished material
Publication Time	Unknown
Title	(MEDWPGPS) Maine Drinking Water Program GPS, 1991-2003
Geospatial Data Presentation Form	tabular digital data
Other Citation Details	Locations in 1996-2003 were collected using Trimble Geoexplorer Global Positioning System (GPS) receivers. Locations in 1991 and 1995 were collected using Trimble Pathfinder GPS Receivers. GPS is a satellite-based positioning system operated and maintained by the U.S. Department of Defense. It consists of 24 NAVSTAR satellites that orbit the earth every twelve hours at an altitude of approximately 12,600 miles, as well as ground-based monitor and upload stations, which track and monitor the satellite orbits, and a master control station. GPS receivers use the signals sent by the satellites to determine where the satellites are and then use this information to calculate the user's position on the earth. Accuracy can range from 1 cm to over 100 meters depending on the number of satellites in view, the position of satellites in relation to each other, the strengths of the satellite signals and the distance of the base station from the GPS receiver. Geoexplorers typically provide accuracy ranges of 2 to 5 meters. Locations have been mapped using the North American Datum 27 (NAD27) later converted to NAD83 in Universal Transverse Mercator (UTM) coordinate system.
[smcilnkh]	false
[smcisrcs]	24000
[smcisrcm]	computer program
Beginning Date	1991
Beginning Time	Unknown
Ending Date	2003
Ending Time	Unknown
[smcisrcc]	ground condition

Source Scale Denominator

24000

Type of Source Media

computer program

Beginning Date

1991

Beginning Time

Unknown

Ending Date

2003

Ending Time

Unknown

Source Currentness Reference

ground condition

Source Citation Abbreviation

medwpgps

Process Description

The point data for public water supply wells and surface water intakes was located statewide using the Global Positioning System. There are 3 types of public water systems in Maine: Transient Systems (restaurants, boys and girls camps, campgrounds, motels, bottled water companies, etc.); Community Systems (utilities, mobile home parks, nursing homes, etc.); and Non-transient, non-community (NTNC) Systems (schools, offices, factories, etc.). All three types are included in this dataset. GPS data are collected for new sources on a continuing basis and added to the coverage periodically. GPS data are differentially corrected using Trimble base station information. GPS for many intake locations were collected from the shore and corrected for distance from shore.

Source Used Citation Abbreviation

medwpgps

Process Date

20020830

Contact Organization

(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program

Contact Position

Manager Source Water Protection

Address Type

mailing address

Address

State House Station 11

City

Augusta

State or Province

Postal Code

04333-0010

Country

USA

Contact Voice Telephone

(207) 287-6196

Process Description

Data for public water supply wells and intakes previously two separate data layers were recompiled for use in SDE format and to serve the Maine Drinking Water Programs IMS application.

Process Date

200306

Contact Organization

(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program

Contact Position

Manager Source Water Protection

Address Type

mailing address

Address

State House Station 11

City

Augusta

State or Province

Postal Code

04333-0010

Country

USA

Contact Voice Telephone

(207) 287-6196

Process Description

Data for surface water intakes was updated with results of Maine Drinking Water Program field work.

Process Date

200306

Process Description

Surface water intakes have been deleted from the Maine GIS Data Catalog distribution copy of this dataset, at the originator request.

Process Date

20040426

Contact Organization

Maine Office of Geographic Information Systems

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station 145

City

Augusta

State or Province

Postal Code

04333-0145

Country

USA

Contact Voice Telephone

207 624-7700

Contact Facsimile Telephone

207 287-4563

Hours of Service

Monday through Friday 0800 - 1700 EST

Cloud Cover

Direct Spatial Reference Method

Vector

SDTS Point and Vector Object Type

Entity point

Point and Vector Object Count

2770

[smcaptur]

true

Grid Coordinate System Name

UTM Zone Number

Scale Factor at Central Meridian

0.9996

Longitude of Central Meridian

-69

Latitude of Projection Origin

False Easting

500000

False Northing

Planar Coordinate Encoding Method

Abscissa Resolution

0.001024

Ordinate Resolution

0.001024

Planar Distance Units

meters

Horizontal Datum Name

North American Datum of 1983

Ellipsoid Name

Geodetic Reference System 80

Semi-major Axis

6378137

Denominator of Flattening Ratio

298.257

Entity Type Label

WELLS

Entity Type Definition

point feature class

Entity Type Definition Source

Environmental Systems Research Institute, Inc. (ESRI)

Attribute Label

BUFFER_ID

Attribute Definition

public water supply buffer identifier, -1 indicates PWS travel time or probabilistic source protection areas for this feature are depicted in WELLMODELS and there is no circular buffer

Attribute Definition Source

MEDWP

Enumerated Domain Value

-1

Beginning Date of Attribute Values

Attribute Label

PWSID

Attribute Definition

PWS_SOUR_ID a unique identifier for each public water supply well in Maine

Attribute Definition Source

Maine Drinking Water Program

Beginning Date of Attribute Values

Attribute Label

RADIUS

Attribute Definition

required radius of related buffer based on population served and/or type of water supply system

Beginning Date of Attribute Values

Attribute Label

SWAP

Attribute Definition

link to Source Water Assessment report

Beginning Date of Attribute Values

Attribute Label

TYPE

Attribute Definition

types of public water system or feature in Maine

Enumerated Domain Value

Enumerated Domain Value Definition

Community Public Water Supply System (utilities, mobile home parks, nursing homes, etc.)

Enumerated Domain Value

Enumerated Domain Value Definition

Transient Public Water Supply System

Enumerated Domain Value

NTNC

Enumerated Domain Value Definition

Non-transient, Non-community Public Water Supply System (schools, office, factories, etc.)

Enumerated Domain Value

Enumerated Domain Value Definition

Non-public

Beginning Date of Attribute Values

Entity and Attribute Overview

The Maine Drinking Water Program maintains extensive database of information on each public water supply well. This dataset has been attributed to provide general reference information in the items TYPE, RADIUS on type of public water system or feature, RADIUS of wellhead or surface water intake protection area proportional to type of system or feature depicted and BUFFER_ID for related buffer. The item PWSID, can be used to relate to existing, or build additional, detailed database information. There are three types of public water systems in Maine: Transient Systems (restaurants, boys and girls camps, campgrounds, motels, bottled water companies, etc.); Community Systems (utilities, mobile home parks, nursing homes, etc.); and Non-transient, Non-Community (NTNC) Systems (schools, offices, factories, etc.). All three types are included in this dataset.

Entity and Attribute Detail Citation

The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.

Entity and Attribute Overview

Entity and Attribute Detail Citation

Contact Organization

(MEGIS) Maine Office of Geographic Information Systems

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station 145

City

Augusta

State or Province

Postal Code

04333-0145

Country

USA

Contact Voice Telephone

(207) 624-7700

Contact Facsimile Telephone

(207) 287-3842

Hours of Service

Monday through Friday 0800 - 1700 EST

Resource Description

Downloadable Data

Distribution Liability

Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.

Format Name

ESRI Shapefile

Format Version Number

ARC Version 9.x

Format Specification

ArcView Shapefile Format

Format Information Content

MEGIS has made all vector layers, in the Maine GIS Internet Data Catalog, available in ESRI's ArcView shapefile format. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView, ArcGIS, ArcExplorer. Shapefiles are a compatible data type for many other types of GIS software. Three files are fundamental to each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles.

File Decompression Technique

Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.

Network Resource Name

http://megis.maine.gov/catalog/

[smhyperl]

-1

[accinstr]

These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog. Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/. If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI). See http://megis.maine.gov/links/ for a link to ArcExplorer 9.x .

[smdistty]

Fees

Data may be downloaded from Maine GIS Internet Data Catalog at no charge.

Turnaround

Data is available for immediate download from the Maine GIS Internet Data Catalog.

Contact Organization

(MEGIS) Maine Office of Geographic Information Systems

Contact Position

GIS Coordinator

Address Type

mailing address

Address

State House Station 145

City

Augusta

State or Province

Postal Code

04333-0145

Country

USA

Contact Voice Telephone

(207) 624-7700

Contact Facsimile Telephone

(207) 287-3842

Hours of Service

Monday through Friday 0800 - 1700 EST

Distribution Liability

Users must assume responsibility to determine the usability of this data for their purposes.

Format Name

ARCSDE

Format Version Number

ArcSDE 9.x

Format Information Content

Oracle 9i

[accinstr]

Please contact the Maine Office of GIS (MEGIS) for access instructions.

[smdistty]

Fees

Access is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.

Metadata Reference Information

Metadata Date

20021101

Metadata Review Date

20070925

Metadata Future Review Date

Metadata Contact

Contact Organization	(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Contact Position	Manager Source Water Protection
Address Type	mailing address
Address	State House Station 11
City	Augusta
State or Province	ME
Postal Code	04333-0010
Country	USA
Contact Voice Telephone	(207) 287-6196

Metadata Standard Name

FGDC Content Standards for Digital Geospatial Metadata

Metadata Standard Version

FGDC-STD-001-1998

Metadata Time Convention

local time