Code of Maine Rules
06 - DEPARTMENT OF ENVIRONMENTAL PROTECTION
096 - DEPARTMENT OF ENVIRONMENTAL PROTECTION - GENERAL
Chapter 528 - PRETREATMENT PROGRAM
Appendix 096-528-E - Sampling Procedures
Current through 2024-38, September 18, 2024
I. Composite Method
II. Grab Method
If composite sampling is not an appropriate technique, grab samples should be taken to obtain influent and effluent operational data. A grab sample is an individual sample collected over a period of time not exceeding 15 minutes. The collection of influent grab samples should precede the collection of effluent samples by approximately one detention period except that where the detention period is greater than24 hours such staggering of the sample collection may not be necessary or appropriate. The detention period should be based on a 24-houraverage daily flow value. The average daily flow should in turn be based upon the average of the daily flows during the same month of the previous year. Grab sampling should be employed where the pollutants being evaluated are those, such as cyanide and phenol, which may not beheld for an extended period because of biological, chemical or physical interaction which take place after sample collection and affect the results.