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Public Water Supply Available. A public drinking water supply must be presently provided or could be provided to the proposed MSD property and to properties within 0.5 miles of the MSD property. Groundwater Use Restriction. Potable use of groundwater within the proposed MSD must be restricted subject to an ordinance issued by the local municipality or subject to a restrictive covenant that is supported by a resolution passed by the local city council. As of the end of calendar year 2009, 118 MSD applications had been certified. The status of individual MSD applications can be monitored on the MSD web page. Maps of the MSD sites are also provided on the web page. Specific information on individual MSD applications can also be obtained from the status information. Railroad Commission of Texas Cleanup Fund Program The Site Remediation Section of the Railroad Commission of Texas (RCT) is responsible for the state-funded cleanup of abandoned oil field pollution sites through the Oil-field Cleanup Program, which is described elsewhere in this report. With a combination of these programs, the remediation of groundwater contamination as a result of oil and gas exploration and production activities has become proactive to the point that historic pollution is diminishing and response to new releases is quicker and more effective. Cleanup options available for these sites include: cleanup to background constituent levels; cleanup to conservative risk-based levels (for example, TRRP Tier 1, Texas Surface Water Quality Standards, Federal Drinking Water Standards, and EPA Soil Screening Criteria); and risk-assessment-driven cleanup using site-specific consideration and data. Regardless of ultimate closure options, when groundwater is contaminated, freephase hydrocarbons are expected to be removed, and full delineation of contamination in all directions is to be performed. For the purpose of establishing consistency, the RCT staff may use as guidance the TRRP groundwater resource classification system. This system is based on the Texas Groundwater Protection Committee’s classification (Appendix 3), with an additional consideration of lowyielding formations from which windmill pumps are able to provide water for stock. Groundwater Contamination The definition of groundwater contamination adopted by the TGPC (Title 31, Texas Administrative Code, §601.3) for use in this report is given in Appendix 4, Texas Groundwater Protection Committee Rules, and is paraphrased as follows: Groundwater Contamination - The detrimental alteration of the naturally occurring physical, thermal, chemical, or biological quality of groundwater. Further, groundwater contamination, for purposes of inclusion of cases in the public files and the joint groundwater monitoring and contamination report, shall be limited to contamination reasonably suspected of having been caused 23
y activities of entities under the jurisdiction of the agencies identified in the Texas Water Code §26.406, TGPC rules, and subsequent legislative amendments. Reported contamination cases are generally limited to those affecting usable quality groundwater (less than 10,000 milligrams per liter of dissolved solids). The first sentence of the definition is based upon the definition of pollution given in §26.001 TWC, and suggests that in identifying contamination, the quality of groundwater must be altered detrimentally. The definition implies that a comparison can be made between known background or natural water-quality conditions and a sampling event that indicates the presence of a contaminant not occurring naturally, or a naturally occurring constituent in amounts or a concentration greater than its naturally occurring concentration. The definition then limits the scope of contamination to activities of entities under the jurisdiction of the agencies participating in the preparation of this report. This limitation excludes naturally occurring saline or highly mineralized water and the intrusion of these waters into usable quality groundwater resources. The contamination cases identified in this report are primarily those where contaminants have been discharged to the surface, to the shallow subsurface, or directly to groundwater from activities such as the storage, processing, transport, or disposal of products or waste materials. Texas Water Code, §26.406, requires the listing and description of documented cases of groundwater contamination reasonably suspected of having been caused by activities under the jurisdiction of state agencies with groundwater protection programs. While the definition of groundwater contamination is broadly interpreted to encompass a large universe of identified cases, the documentation of groundwater contamination should be considered more carefully in order to assure accuracy and fairness in reporting impacts to groundwater resources. Documentation of contamination requires an evaluation of the significance of the data, the reliability of the data, and proper interpretation of the data. Information and analyses of groundwater conditions should be representative of the actual conditions at the site. The data must be adequate to justify conclusions or further actions with regard to documenting contamination. Conditions that should be considered include whether a well is completed in more than one aquifer, whether a contaminant is present in the aquifer, or whether a contaminant has been introduced into the well from the surface. These factors are regarded as necessary and are incorporated into the design of monitoring programs and sampling procedures for each regulatory program. These factors are also important for ambient groundwater monitoring program design. Groundwater information, especially analytical data, must be of reliable quality. A groundwater sample is subject to inadvertent alteration at many points from its removal at the well to its final laboratory analysis. It is important that reliable, verifiable procedures be used for sampling, handling, and laboratory analysis. Verification of analytical results is often desirable before concluding that contamination has occurred. Verification procedures include resampling and splitting samples with other entities for comparison of analytical results. Proper interpretation of information and analytical data is essential to the goal of documenting groundwater contamination. Comparing sample results to known 24
Page 1 and 2: Below is an Electronic Version of a
Page 4 and 5: Joint Groundwater Monitoring and Co
Page 6 and 7: ACRONYMS Agencies, Divisions, and P
Page 8 and 9: Contents SUMMARY ..................
Page 10 and 11: SUMMARY The Texas Groundwater Prote
Page 12 and 13: jurisdiction of those programs. Mon
Page 14 and 15: Data indicate that an estimated 57,
Page 16 and 17: pesticides, including alachlor, atr
Page 18 and 19: Figure 1. Case History of Groundwat
Page 20: Figure 2b. Case History of Groundwa
Page 23 and 24: the director of the Bureau of Econo
Page 25 and 26: Meetings The TGPC and most of its s
Page 27 and 28: There are many ways that risk-based
Page 29 and 30: TRRP is a risk-based rule in the se
Page 31: Modified groundwater response appro
Page 35 and 36: petroleum product, used oil, hazard
Page 37 and 38: Figure (Cont.) Site City Contaminat
Page 39 and 40: egional office locations are given
Page 41 and 42: ● ● ● Groundwater is defined
Page 43 and 44: descriptions for the county of inte
Page 45 and 46: Enforcement Status Codes In general
Page 47 and 48: Figure 8. Enforcement Status Matrix
Page 49 and 50: egulates a wide range of activities
Page 51 and 52: maintain environmentally sensitive
Page 53 and 54: of subsurface mineral deposits, and
Page 55 and 56: Status of Groundwater Contamination
Page 57 and 58: included a civic center expansion,
Page 59 and 60: Superfund Registry first seek fundi
Page 61 and 62: cases of groundwater contamination.
Page 63 and 64: wells sampled, and the contaminatio
Page 65 and 66: Water Quality Division The Water Qu
Page 67 and 68: administrative activities carried o
Page 69 and 70: acetochlor, diazinon, 2,4-D, and gl
Page 71 and 72: Texas Water Development Board Progr
Page 73 and 74: TWDB contracts with analytical labo
Page 75 and 76: Oil field Cleanup Program Descripti
Page 77 and 78: Monitoring by the Commission is gen
Page 79 and 80: Texas Department of Agriculture The
Page 81 and 82: Texas State Soil and Water Conserva
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Status of Groundwater Contamination
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Identifying source of nitrate in gr
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Texas Department of Licensing and R
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Table 1 Texas Commission on Environ
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TABLE 1 GROUNDWATER CONTAMINATION C
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Figure 11. TCEQ Enforcement Status
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Table 2 Railroad Commission of Texa
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Figure 13. RCT Enforcement Status S
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Table 3 Texas Alliance of Groundwat
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Figure 16. TAGD County Contaminatio
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APPENDIXES Appendix 1. Appendix 2.
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Appendix 1. Members and Representat
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Department of State Health Services
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Appendix 2. Texas Groundwater Prote
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Appendix 3. Groundwater Classificat
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Figure 17. Groundwater Classificati
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Appendix 4. Rules of the Texas Grou
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Title 31. NATURAL RESOURCES AND CON
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Appendix 5. TCEQ Rules on Spill Pre
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Discharges or spills of oil that en
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Appendix 6. District and Regional O
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TCEQ AREAS & REGIONS Dallam Hartley
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Railroad Commission of Texas Distri
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BUREAU OF ECONOMIC GEOLOGY DEPARTME
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Hays Trinity Groundwater Conservati
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Real-Edwards Conservation & Reclama
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TEXAS DEPARTMENT OF AGRICULTURE TEX
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Publication No. SFR-56/97, June 199
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development. Texas Natural Resource
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This users manual describes the Boa
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TABLE 4 (APPENDIX 10) HISTORIC GROU
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