Oregon Administrative Rules
Chapter 166 - SECRETARY OF STATE, ARCHIVES DIVISION
Division 150 - COUNTY AND SPECIAL DISTRICT RETENTION SCHEDULE
Section 166-150-0190 - Public Works Records - Wastewater Treatment

(1) Annual Inspection Records Records documenting annual inspections of agency wastewater treatment operations by the Oregon Department of Environmental Quality to monitor compliance with National Pollution Discharge System (NPDES) permit conditions. May include reports and supporting documentation. Information includes date, location, areas evaluated during inspection, summary of findings, pretreatment requirements review, sampling checklists, flow measurements, laboratory assurance checklists, and related data. (Minimum retention:

(2)Confined Spaces Permits Records used to document that employers have issued permits according to the requirements outlined in 29 CFR 1910.146 relating to the testing for hazardous materials in confined spaces (sewers). Permits must be issued prior to employees' entrance into the confined space. Records may include but are not limited to permit, preentry testing data, field notations and observations. In addition, the employer is required to make note of any problems encountered during an entry operation on the pertinent permit so that appropriate revisions to the permit space program can be made. (Minimum retention: 1 year ( 29 CFR 1910.146(e) (6) ))

(3)Discharge Monitoring Records Records documenting the amount of pollution discharged from the agency's wastewater treatment facility. Reports are submitted to the U.S. Environmental Protection Agency and the Oregon Department of Environmental Quality. May also include supporting documentation. Information includes date, period covered, permit number, discharge number, frequency of analysis, sample type, and average and maximum quantities and concentrations of solids, ammonia, chlorine, nitrogen, and other chemicals, as well as other data. (Minimum retention:

(4)Hazardous Situation Permits Records document the issuance of a permit by the employer notifying employees that they may be exposed to hazardous substances and/or conditions in confined spaces, most notably a sewer. Records include permit, pre-entry testing data, field notations and observations. (Minimum retention: 1 year after permit cancelled ( 29 CFR 1910.146(e) (6) ))

(5)Industrial Pre-treatment Permits Permits issued by the agency to private industries allowing the discharge of specific pollutants under controlled conditions. Often contains applications, permits, addenda, modifications, and related supporting documentation. Information may include influent and effluent limits, chemical analysis data, water flow, test and recording requirements, definitions and acronyms, compliance schedules, and related data. (Minimum retention:

(6)Mobile Waste Hauler Dumping Records Records documenting the dumping of septic pumpings and other wastes from various sources at the agency waste treatment facility. Usually includes logs, manifests, and similar documents. Information often includes name and signature of hauler, quantity of wastes dumped, location at which wastes were pumped, and related data. (Minimum retention: 5 years)

(7)National Pollution Discharge Elimination System Permits Records documenting the application for and issuance of a permit to the agency under the Clean Water Act allowing discharge of specific pollutants under controlled conditions. Often contains applications, permits, addenda, modifications, and related supporting documentation. Information includes influent and effluent limits, chemical analysis records, water flow, test and recording requirements, definitions and acronyms, compliance schedules, and related data. (Minimum retention:

(8)Sewage Sludge Application Site Logs Logs documenting the agricultural application of sewage sludge to approved sites. OAR 340-050-0035(1) requires that agencies maintain these logs permanently. Subjects include agronomic loading calculations related to maximum application of nitrogen in pounds per acre per year, and ultimate site life loading calculations tracking the amount of heavy metals applied. (Minimum retention: Permanent)

(9)Sewage Sludge Management Plans Plans submitted to the Oregon Department of Environmental Quality by the agency to engage in sludge disposal or application activity. Information includes method of sludge removal, land application or disposal sites, sludge stability determination methods, projected sludge storage basin use, sludge analyses, application rates, and heavy metal limitations. (Minimum retention: Permanent)

(10)Strip and Circle Chart Records Records documenting the continuous monitoring of various wastewater treatment operations. May include strip charts, circle charts, and similar monitoring records. Information often pertains to pump flows, influent and effluent water flows, secondary total flow, influent pH, chlorine residue, and related subjects. (Minimum retention: 3 years)

(11)Wastewater Treatment Operations Records Program records not listed elsewhere in this schedule which document wastewater treatment operations. Created on a daily, monthly, and annual basis. Usually consists of reports, logs, log sheets, and related records. (Minimum retention:

(12)Water Pollution Control Facilities (WPCF) Permit Records Records documenting the application for and issuance of a Water Pollution Control Facilities permit to the agency by the Oregon Department of Environmental Quality. The permit authorizes the agency to construct and operate a disposal system with no discharge to navigable waters. Examples include sewage lagoons, septic tanks, and drain fields. Records often include applications, permits, addenda, modifications, and related supporting documentation. (Minimum retention: