(1) Purpose. The purpose of this section is to provide water quality regulations for midstream facilities.

(2) Water sources. The city, through its utility enterprise Aurora Water, will identify water sources and critical infrastructure located near operator's infrastructure, and the water sources and critical infrastructure will be noted on operator's site plans that will be provided during the review process. The operator will then note the distance of the water sources and critical infrastructure from the edge of the CGF, compressor station, and associated facilities.

(3) Water supply. The operator shall comply with applicable laws, rules, and regulations concerning the source(s) of water used in the construction and operations phase. A fully executed water delivery agreement, if applicable, is required prior to operations. Per City Code, all water used within the City of Aurora shall be supplied by the city unless approved by city council.

(1) Maintenance. Routine field maintenance of vehicles or mobile machinery shall not be performed within 500 feet of any waters of the United States or State surface waters. All fueling must occur over impermeable material, and spills must be cleaned up and properly disposed of.

(2) Wastewater and waste management. Operator must submit a waste management plan to the city that complies with the following:

(3) Stormwater management. When seeking to permit a new oil and gas midstream location or oil and gas midstream facility, operator must apply for and obtain a city stormwater and erosion control permit. Erosion and sedimentation control are required.

(1) Groundwater pollution mitigation. Operator shall avoid causing degradation to surface or ground waters within the city and to wetlands within the city. If operator is responsible for degradation of water, it will pay the full cost to restore water quality as close to baseline as possible.

(1) General. The operator shall construct a gathering line and off-location produced water flowline for the transportation of hydrocarbons and produced water to the CGF, compressor station, or other transfer point.

(2) Temporary use of tanks. Operator shall be permitted to utilize temporary tanks during gathering line and off-location produced water flowline maintenance operations, provided operator has obtained city approval regarding the location and any required screening for temporary tanks if the maintenance or temporary tanks are present longer than seven calendar days. For maintenance operations that extend greater than seven days, operator shall give the city prior notice of maintenance activities within three days and the planned number of temporary tanks.

(1) General. The operator shall utilize steel-rim berms or lined earthen berms around all permanent facility tankage at the CGF and compressor station with sufficient capacity to contain the maximum volume of the largest tank on location, plus a 25-year, 24-hour rain event, plus sufficient freeboard to prevent overflow.

(2) Permanent berms. Permanent containment berms shall be constructed of lined earthen berms or steel rings, designed and installed to prevent leakage and resist degradation from erosion or routine operation.

(3) Secondary containment. Secondary containment shall be constructed with a synthetic or engineered liner that is mechanically connected to the steel ring to prevent leakage.

(1) Additional regulations related to water preservation or protection shall be imposed by the city staff during the OGMP application process in order to mitigate risks of potential contamination to a floodplain.

(1) Planning process and preliminary drainage report. The OGMP process may require the submittal of a preliminary drainage report for oil and gas midstream facilities and pumping stations.

(2) Civil plans—Process. Public works engineering will require a civil plan pre-submittal meeting to be held. To set up a meeting, please contact the engineer on call.

(3) Civil plans—Content and naming convention. Applications and checklists for oil and gas midstream facilities have been developed using the term "stormwater management plans (SWMPs)" in reference to the civil plans for these sites. The civil plans for oil and gas midstream facilities include features that go beyond typical SWMPs. Drainage reports (both preliminary and final) and civil plan submittals will be reviewed using city standards.

(4) Civil plans—Submittal package. Civil plan submittals for oil and gas midstream locations and oil and gas midstream facilities will be determined on a case-by-case basis at the civil plan pre-submittal meeting and may include: final drainage report, stormwater management report, and an inspection and maintenance plan. Any grading within an existing utility easement may require a structural loading evaluation as determined at the civil plan pre-submittal meeting. The structural loading evaluation shall be submitted with the first submittal of civil plans.

(5) Subsurface utility investigation—Loading information. Civil plans prepared for oil and gas midstream locations and oil and gas midstream facilities must include the following note: "Project shall comply with Subsurface Utility Engineering (SUE) requirements per C.R.S. 9-1.5-101 et seq. when the project includes excavation, including but not limited to electronically traceable markers or tracing wire per Aurora Water Standards and Specifications for all subsurface utilities. By stamping the plan, the engineer of record is certifying the plan meets the standards established by the American Society of Civil Engineers (ASCE 38-02) for defining the accuracy of an underground facility. In addition, Aurora Water requires any crossing of existing utilities or tie-ins to provide pre-design potholing.

(6) Gathering line and off-location produced water flowline civil plans—Content. Civil plans for gathering lines and off-location produced water flowlines shall include plan and profile sheets (P&Ps) where such pipelines cross city ROW, utility easements, floodplains, or other critical areas as determined on a case-by-case basis. The subsurface utility investigations described above shall be used to provide depictions of existing utilities on those profiles. The P&Ps shall be included with the SWMP submittal.

(7) Drainage easements—License agreements. For all oil and gas midstream facilities, the need for easements and license agreements shall be evaluated on a case-by-case basis. If there is a need for a drainage or license agreement, these documents must be executed prior to civil plan approval.

(8) Gathering line and off-location produced water flowline CAD files and as-builts. 3-D polyline CAD files that represent the full length of the pipeline alignment within the city limits, depth, material, and diameter information, shall be submitted to the city with the signature set of civil plans. In addition, the city requires as-builts for entire pipeline alignments upon construction completion for pipelines external to pad sites. This shall be noted on the site plans, civil plans, and in stormwater permits. CAD files, which include pipeline locations, should be uploaded separately so that they may be properly coded as "sensitive" for security purposes. The city will hold these submittals confidential and exempt from the Colorado Open Records Act, as allowed by law.

(9) CAD submittal standards. The city has developed CAD data submittal standards to streamline the process of importing AutoCAD information into the city's Enterprise GIS. A digital submission meeting the CAD data submittal standards is required before the final site plan mylars can be routed for signatures or recorded. CAD data submittal standards, including templates and required layer file labeling, are available at the city. Email your case manager the appropriate site plan and pipeline easement files before submitting your final site plan mylars. Once received, the city's AutoCAD operator will run an audit report, and your case manager will let you know whether the file meets or does not meet the city's CAD data submittal standards. (Ord. No. 2021-15, § 12, 6-14-2021)