7 Del. Admin. Code § 7103-90.0

Current through Register Vol. 28, No. 3, September 1, 2024

Section 7103-90.0 - Plan of Operation and Management for Slow Rate Land Treatment Systems

The plan shall include but not be limited to the following:

90.1 Introduction

90.1.1 System Description:

90.1.1.1 A narrative description and process design summary for the land treatment facility including the design wastewater flow, design wastewater characteristics, preapplication treatment system and spray fields.

90.1.1.2 A map of the land treatment facility showing the preapplication treatment system, storage pond(s), spray fields, buffer zones, roads, streams, drainage system discharges, monitoring wells, etc.

90.1.1.3 A map of interceptor sewers, force mains and major pump stations tributary to the land treatment facility. Indicate their size and capacity.

90.1.1.4 A schematic and plan of the preapplication treatment system and storage pond(s) identifying all pumps, valves and process control points.

90.1.1.5 A schematic and plan of the irrigation distribution system identifying all pumps, valves, gauges, sprinklers, etc.

90.1.1.6 Discussion of the design life of the facility and factors that may shorten its useful life,including procedures or precautions which will compensate for these limitations.

90.1.1.7 A copy of facility's National Pollutant Discharge Elimination System (NPDES) Permit, if applicable.

90.2 Management and Staffing

90.2.1 Outline of management's responsibilities and duties.

90.2.2 Outline of staffing requirements and duties:

90.2.2.1 Describe the various job titles, number of positions, qualifications, experience, training, etc.

90.2.2.2 Define the work hours, duties and responsibilities of each staff member.

90.3 Facility Operation and Management

90.3.1 Preapplication Treatment System:

90.3.1.1 Describe how the system is to be operated.

90.3.1.2 Discuss process control.

90.3.1.3 Discuss maintenance schedules and procedures.

90.3.2 Irrigation System Management:

90.3.3 Wastewater Application. Discuss how the following will be monitored and controlled. Include rate and loading limits.

90.3.3.1 Wastewater loading rate (inches/week)

90.3.3.2 Wastewater application rate (inches/hour)

90.3.3.3 Spray field application cycles

90.3.3.4 Organics, metals, nitrogen, and phosphorus loading (lbscre per month, etc)

90.3.4 Discuss how the system is to be operated and maintained.

90.3.4.1 Storage pond(s)

90.3.4.2 Irrigation pump station(s)

90.3.4.3 Spray field force main(s) and laterals

90.3.5 Discuss start-up and shut-down procedures.

90.3.6 Discuss system maintenance.

90.3.4.1 Equipment inspection schedules

90.3.4.2 Equipment maintenance schedules

90.3.7 Discuss operating procedures for adverse conditions.

90.3.7.1 Wet weather

90.3.7.2 Freezing weather

90.3.7.3 Saturated Soil

90.3.8 Excessive winds

90.3.8.1 Electrical and mechanical malfunctions

90.3.9 Provide troubleshooting procedures for common or expected problems.

90.3.10 Discuss the operation and maintenance of back-up, stand-by and support equipment.

90.3.11 Vegetation Management:

90.3.11.1 Discuss how the selected cover crop is to be established, monitored and maintained; how the irrigation schedule will be altered during harvest and regeneration.

90.3.12 Discuss cover crop cultivation procedures, harvesting schedules and uses.

90.3.13 Discuss buffer zone vegetative cover and its maintenance.

90.3.14 Drainage System (if applicable):

90.3.14.1 Discuss operation and maintenance of surface drainage and runoff control structures.

90.3.14.2 Discuss operation and maintenance of subsurface drainage systems.

90.3.15 Emergency and Contingency Planning

90.4 Monitoring Program (reference section 80.0)

90.4.1 Discuss sampling procedures, frequency, location and parameters for:

90.4.1.1 Preapplication treatment system.

90.4.1.2 Irrigation System:

90.4.1.2.1 Storage pond(s)

90.4.1.2.2 Groundwater monitoring wells

90.4.1.2.3 Drainage system discharges (if applicable)

90.4.1.2.4 Surface Water (if applicable)

90.4.2 Discuss soil sampling and testing:

90.4.3 Discuss ambient conditions monitoring:

90.4.3.1 Rainfall.

90.4.3.2 Wind speed

90.4.3.3 Soil moisture

90.4.4 Discuss the interpretation of monitoring results and facility operation:

90.4.4.1 Preapplication treatment system.

90.4.4.2 Spray fields.

90.4.4.3 Groundwater.

90.4.4.4 Soils

90.5 Records and Reports

90.5.1 Discuss maintenance records:

90.5.1.1 Preventive.

90.5.1.2 Corrective.

90.5.2 Monitoring reports and/or records (appropriate items to be included are determined by nature of the wastewater, pretreatment, site conditions and management):

90.5.2.1 Preapplication treatment system and storage pond(s).

90.5.2.1.1 Influent flow

90.5.2.1.2 Influent and effluent wastewater characteristics

90.5.2.2 Irrigation System.

90.5.2.2.1 Wastewater volume applied to spray fields

90.5.2.2.2 Spray field scheduling

90.5.2.2.3 Loading rates

90.5.2.3 Annual Record of Groundwater Depth.

90.5.2.4 Drainage system discharge parameters (if applicable).

90.5.2.5 Surface water parameters (if applicable).

90.5.2.6 Soils data.

90.5.2.7 Rainfall and climatic data.

7 Del. Admin. Code § 7103-90.0