Consultations were held with state, local, and federal agencies to determine the existence, structure, validity, and condition of existing electronic and paper databases needed for this project. Agreements with these agencies will be negotiated to update and validate all of these databases. Appendix J includes a copy of USGS’s workplan for this project. This workplan outlines the specific tasks and timeline for completion of the data gathering and inventory process.

Selection has been made of the set of data bases to be developed and used in the source water assessments. On page 3 of this section is a general list of GIS layers and databases that will be used in the digital inventory process. Initial efforts will focus on locational data bases for all ground water and surface water sources within the state. Other broad categories of databases will include, but not be limited to; basin characteristics, aquifer characteristics, and land surface characteristics.

All databases used in the development of the SWAP will be given appropriate documentation in the form of data dictionaries. The data dictionaries will fully describe the fields, data within the fields, QA/QC, as well as conform to existing state standard for data dictionaries. The complete package of databases developed will be made available to all interested agencies and parties in Arkansas once the program is implemented.

CONTAMINANT INVENTORY

An inventory of potential contaminants will be established for each assessment area. Consultations were held with all pertinent agencies / divisions that manage PSOCs or have existing PSOC databases to determined the type of data attributes, data locations, quality of data, data availability, and status of documentation. Existing locational data may be used (if deemed adequate), GPS methods may be used for field locations, or map locations may be used for locating the PSOCs.

To assist in this process, maps indicating the location of the source, the assessment area and all PSOCs identified in the initial digital research will be sent to the water system for verification. An example of the proposed verification packet that will be provided to water systems is provided for reference beginning on page 4-10.

The inventory will consist of PSOCs that are categorized according to their health significance.

Potential sources of contamination that are outside the delineated assessment area may be considered in the overall vulnerability assessment report.

A seamless statewide GIS database will be created by compiling various PSOC databases. Contaminant inventory reports will detail the number, type, health risk category and location of all potential sources of contamination. Additional information on contaminant types and their significance is provided in Appendix C. The inventory will be summarized by listing the number of contaminants in each Health Risk Category (see page 4-4) within specified zones. These zones will vary according to source type and size of the assessment area. A description of these zones is outlined on the following page.

The number of PSOCs that lie within the assessment area for river / streams and impoundments will be determined and mapped. They will be categorized by Health Risk and the distance from the intake determined. A summary of the PSOCs will be provided listing the number of PSOCs in each category located within the following zones:

The number of PSOCs that lie within the assessment area for springs and GWUDI wells will be determined and mapped. They will be categorized by Health Risk and the distance from the well / spring determined. A summary of the PSOCs will be provided listing the number of PSOCs in each category located within the following zones:

**Outside the assessment area, but within the recharge basin where such information is available

The number of PSOCs that lie within the assessment area for wells will be determined and mapped. They will be categorized by Health Risk and the distance from the well determined. A summary of the PSOCs will be provided listing the number of PSOCs in each category located within one of three zones. The following zones were established for a base one-quarter mile assessment area. Assessment areas larger or smaller than this base size will be proportioned accordingly. (i.e. If radius of the assessment area is half as large, the each zone will be cut in half: 0 – 220; 220.5 –440; & 440.5 – 660)

Geology (1:500k) vector

Soils (STATSGO 1:250k) vector

Poultry/Swine houses (AHTD cells, all but one county)

Land Cover re-class of GAP (30m raster)

Canals and Ditches (1:100k vector TIGER/DLG)

Irrigation Wells (as determined by ASWCC)

NPDES and TRI (EPA, vector data in Arc Info)

Highways by classification, railroads, airports, bridges (AHTD)

Pipelines (TIGER/DLG? 1:100k)

RCRA

ERNS

Cemeteries (AHTD/GNIS)

Schools (AHTD/GNIS)

Septic Systems (Rural structures from AHTD)

Mines (GNIS)

Elevation (30m where available; else 80m)

Streams/Rivers/Impoundments (DLG 1:100k)

Dairies (Ark. Dept. of Health)

Oil and Gas Wells

The following is a generalized categorization of the various types of Potential Sources of Contamination that are expected to be found during the contaminant inventory process. These lists are categorized in a fashion that give a generalized rank of contaminant sources taking into account the relative public health significance and the likelihood for a release of contaminants to affect the source. There are 10 categories listed for each type of water system / source. Category 1 is considered to be of the most significance and Category 10 the least significant. A more detailed list of facilities that produce, store or distribute materials that, if released could result in some degree of contamination of a source water is included in Appendix C.

** See Pesticide Application Rate Distribution Map on page 4-9 of this Section

** See Pesticide Application Rate Distribution Map on page 4-9 of this Section

** See Pesticide Application Rate Distribution Map on page 4-9 of this Section

** See Pesticide Application Rate Distribution Map on page 4-9 of this Section

The list for Transient Non-Community Public Water Systems contains sources that could contribute microbial or nitrate / nitrite contamination to the source water. This is a minimum list of contaminants that will be evaluated during the Phase I Assessment process. Future on-site investigations will not be limited to this list. If an inspection reveals a source of contamination which might adversely affect the water quality nearby, the system will be advised and the initial assessment amended.

TO: Public Drinking Water System Operators / Managers

FROM: Tony Ramick, R.S.

Source Water Protection Specialist

RE: Source Water Assessment Program – Assessment Maps

Through Congressional statute, the Environmental Protection Agency (EPA) has mandated a Source Water Assessment Plan (SWAP) be developed by each state. The Arkansas Department of Health (ADH) has partnered with the United States Geological Survey (USGS) and Advisory Committees (made up of citizens and technical professionals throughout the State) to develop a SWAP. The ADH, USGS, and the Advisory Committees have been meeting over the past year to develop this Plan. In addition, Public meetings were held across the State in an effort to allow interested person(s) and / or organization(s) to voice their opinion on the development of this Plan. By mandate, the Plan had to be (and was) submitted to EPA by February 6, 1999.

The implementation of this Plan has begun. Part of the implementation involves the determination of the correct locations of all public drinking water source supply wells / surface intake structures and the Potential Sources of Contamination (PSOCs) that may affect them. Therefore, we are requesting your help in gaining the correct and / or updated information of the well(s) / surface intake structure(s) and PSOCs.

A PSOC is defined as; "a contaminant that has the potential to adversely affect the quality of a drinking water supply". Generally the most commonly found PSOCs are as follows:

Gas / Fuel / Oil / Sales / Storage Chemical Storage / Mfg. / Sales Airport / Airstrip

Sludge / Animal Waste / Application Sites Agri. Chemical / Sales / Storage Septic Tanks

Landfills / Dumps / Mining Sites Water / Gas / Oil Wells Repair Shops

Animal Feeding / Growing Operations Indust. / Factories Auto Body Shop

This illustration is not to be considered a complete PSOC list.

Enclosed you will find map(s) showing the location of your water supply source(s) and PSOCs that we have identified within the assessment area(s). We are asking that you review and verify the information contained on the map(s) and PSOC list(s). You will also find enclosed a copy of Instructions for Editing Maps and examples of an edited map and PSOC list. Please edit your map(s) and PSOC list(s) in the same manner. It is important that you verify the location of your public water supply well / surface intake structure and the PSOCs within the assessment area on the map, and make the appropriate changes as stated in the Instructions for Editing Maps.

Edited maps and PSOC lists must be returned by March 26, 1999 to:

ATTN: Tony Ramick

Arkansas Department of Health

Division of Engineering

4815 West Markham M.S. # 37

Little Rock, Arkansas 72205

Your participation in this process is very important. If you have questions after reviewing the enclosed materials please contact Ginger Tatom, Lyle Godfrey, or myself at 501-661-2623. It is of the utmost importance that you fully understand the Instructions of Editing Maps before making any changes.

Thank you for participation and help in this matter.

YES NO NOT SURE

Comments:____________________________________________________

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(Additional comments may be written on the back of this page)

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