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Archives & Records Management

Office of the City Auditor

phone: 503-865-4100

email: parc@portlandoregon.gov

1800 SW 6th Ave, Suite 550, Portland, OR 97201

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9401 Wastewater Group - Operations

9401‑01(A)   WG, Monthly Discharge Monitoring Reports (DMR)

Series is used to document the operating parameters of the treatment plant, as required by NPDES, on a monthly basis. Series is also created to document the history of plant operations. Records include the actual report and the raw data that is used to compile reports to EPA and Oregon DEQ.  Information includes flows, loadings, citywide rainfall measurements, and other related data.

Retention: Permanent
Authority: OAR 166-200-0360(2)(a)
Confidential? No                
Vital Record? Yes
Record Copy? Yes

 

9401‑01(B)   WG, Monthly Monitoring Report Research & Backup Data

Series consists of the research and data used to compile the monthly Discharge Monitoring Report (see 9401-01(A).  Information includes flows, loadings, load data, tonnage, biosolids (sludge) production, citywide rainfall measurements, control building data, digester data, dredge reports, process lab, gravity thickener lab report, belt press lab report and other related data.

Retention: 5 years
Authority: OAR 166-200-0360(2)(b) 
Confidential? No                
Vital Record? Yes
Record Copy? Yes      

 

9401‑03   WG, Location Assignment Sheets

Series is created to track the assignment of rotating duties of the Wastewater Operations staff.  Information includes work assignment, name, date and other related data.

Retention: 2 years
Authority: OAR 166-200-0400(2) 
Confidential? No                  
Vital Record? No
Record Copy? Yes                                         

 

9401‑04   WG, Operations Logs                                    

Series is used to document the status of equipment. Series is created as a communication tool between operators to pass relevant information between shifts.  Information includes problems, current equipment status and other related data.

Retention: 5 years
Authority: OAR 166-200-0360(7)
Confidential? No                  
Vital Record? No Record Copy?  Yes                            

 

9401‑05   WG, Strip and Circle Chart Records 

Series is used to monitor the operating levels of equipment and various influent/effluent flows at Tryon Creek Wastewater Treatment Plant (TCWTP). Record is a chart with daily readings.  Information includes pump flows, influent/effluent water flows, secondary total flow, influent pH, chlorine residual and other related data.

Retention: 5 years
Authority: OAR 166-200-0360(4)
Confidential? No                  
Vital Record? No
Record Copy? Yes                            

 

9401‑06   WG, Methane Gas Sales Records

Series is used to document the volume of methane gas sold to private businesses. Records include monthly volume, billing, contract, and other related data.  Information contained includes the amount of gas sold to outside companies.

Retention: Contract related correspondence retain 6 years after contract expiration.  Other records retain 5 years.
Authority: OAR 166-200-0360(7); 166-200-0215(8)
Confidential? No                 
Vital Record? No
Record Copy? Yes