Design curve

City Moves forward with Waste Water Treatment Updates

February 24, 2020
CATEGORICAL EXCLUSION
TO ALL INTERESTED AGENCIES AND PUBLIC GROUPS:
Consistent with the environmental review process adopted by the Texas Water Development Board (TWDB) for projects funded through the Clean Water State Revolving Fund (CWSRF) program, specifically 31 Texas Administrative Code (TAC) Chapter 375, Subchapter E, and with the terms and conditions of the National Environmental Policy Act, 42 U.S. Code § 4321, et seq., the Executive Administrator of the TWDB has determined that the proposed action identified below may be exempted from formal  environmental review requirements:

City of Colorado City, Mitchell County, Texas
Wastewater Treatment Plant Headworks Improvements
CWSRF Project No. 73815
Total TWDB Commitment Amount: $2,650,000

The City of Colorado City (City) is located in Mitchell County, west-central Texas, approximately 65 miles west of Abilene and along the Colorado River. The City’s population of 4,029 residents is projected to grow over 40% to 5,801 by 2040. Currently, there are 1,597 wastewater connections (1402 municipal, 179 commercial, and 14 institutional) and 1,770 water connections within the City’s service area, which is generally the Colorado City limits.

The headworks at the City’s existing wastewater facility have deteriorated and must be replaced. The bar screen is ineffective at capturing debris to keep it out of the treatment ponds, the cement structure around the headworks is failing, and the existing grit chamber is not in working order. As a result, the plant does not provide an adequate level of treatment,
resulting in a citation by the Texas Commission on Environmental Quality.

The City proposes to replace the existing headworks equipment, including the automatic bar screen, grit trap, grit classifier, sludge belt press, feed pump, sludge processing equipment, and headworks piping. To implement the proposed improvements, the City has applied to
the Texas Water Development Board (TWDB) for funding from the Clean Water State Revolving Fund for project planning, design, and construction in the amount of $2,650,000.

As part of the project funded by the TWDB, the City does not intend to construct or install any new sludge storage ponds, irrigation pivots, pipelines, roads, or other infrastructure not listed in the project descriptions summarized above. Construction will be conducted entirely
within the City’s wastewater treatment plant (WWTP) facility boundary, and will not include pipelines for disposal of treated effluent by land application as indicated in previous project proposals. Only piping directly associated with the headwork improvements is included in the project currently proposed.

Environmental impacts should be similar to rehabilitation and replacement of existing facilities and with construction of new minor ancillary facilities on the same property as existing facilities. The National Wetlands Inventory identifies one existing sludge pond as a wetland as well as other small wetlands in the area of probable impacts. The proposed project will not alter the current use of the sludge ponds, and will not impact existing nearby wetlands. No streams, waterbodies, or other potential waters of the U.S. occur in the project area. Areas of natural vegetation measuring approximately 250 ft. by 730 ft. that occur
within the project area will be disturbed by the placement of new equipment. Construction within the existing WWTP site is not expected to impact threatened or endangered species or habitat.

There are no previously recorded significant or potentially significant sites within or adjacent to the proposed project, according to the Texas Historical Commission’s Archeological Sites Atlas, nor is the proposed project within the protected area surrounding a historic cemetery, structure, or district.

The decision to issue a CE is allowed because the specified project elements should not cause significant adverse impacts to the quality of the human environment. Documentation supporting this determination is on file at the TWDB.

This determination shall be revoked if it is found that:

1) the project no longer meets the requirements for a CE as a result of changes in the project;

2) the project involves extraordinary circumstances as described in 31 TAC
Chapter 375, Subchapter E; or

3) the project may violate or has violated federal, state, local, or tribal laws.

The project also must comply with the following environmental conditions pertaining to the system components specified herein:

• Standard emergency condition for the discovery of cultural resources; and,
• Standard emergency condition for the discovery of threatened and endangered species.

Documentation supporting this determination is on file at the TWDB. Requests for information or comments regarding this determination may be submitted to:

Director of Regional Water Project Development,
Texas Water Development Board,
P.O. Box 13231,
Austin, Texas 78711-3231.