Grimsby Water Treatment Plant - 2019 Summary Report

Prepared under Ontario Regulation 170/03

The Grimsby Water Treatment Plant was found to be in non-compliance with regulations and/or system Licenses, as follows:

  • Niagara Region was found to be in non-compliance with subsection 6-1.1 (1) of Schedule 6 of O. Reg 170/03 which specifies that weekly samples are to be taken 5 to 10 days apart. Section 4.0 of schedule C of the Municipal Drinking Water Licence requires weekly sampling of treated process waste water for free chlorine residuals prior to discharge to the environment. Sampling was conducted on a weekly basis during the inspection period except between Jan. 9-21, 2019 where the tests were performed 12 days apart. Internal operating procedures will be updated and staff training will be conducted to ensure sampling requirements are met in the future.

Summary of Flows

Date Total Flow Raw (ML) Total Flow Treated (ML) Average Day Raw (ML) Average Day Treated (ML) Maximum Day Treated (ML) Minimum Day Treated (ML) Maximum Flow Rate Treated (ML/d) Minimum Flow Rate Treated (ML/d) Waste Sludge (ML)
Jan 404.671 404.464 13.054 13.232 20.014 11.027 15.656 13.597 0.650
Feb 360.032 360.057 12.858 12.859 13.675 11.572 17.109 7.749 0.650
Mar 400.309 399.968 12.913 12.902 14.086 11.892 18.958 7.209 0.694
Apr 383.980 382.635 12.799 12.755 14.655 11.393 18.045 7.010 0.780
May 428.875 422.888 13.835 13.642 15.650 11.456 18.546 8.684 1.951
Jun 460.855 457.213 15.362 15.240 18.333 12.079 73.432 2.472 0.694
Jul 550.331 554.625 17.753 17.891 20.744 15.408 25.175 7.348 0.939
Aug 471.050 491.739 15.195 15.863 19.098 13.009 23.062 9.300 0.911
Sep 409.215 433.978 13.641 14.466 16.323 12.405 19.230 9.429 0.911
Oct 382.356 410.761 12.334 13.250 14.926 12.199 18.051 3.525 2.255
Nov 352.285 392.247 11.743 13.075 14.125 11.903 17.453 8.155 0.477
Dec 357.343 401.711 11.527 12.958 13.959 11.164 17.761 6.985 0.650
Total 4961.302 5112.286             11.562
Minimum               2.472 0.477
Maximum         20.744   73.432   2.255
Average     13.584 14.011         0.963

The flow rates are moments in time, and can be affected by various circumstances, such as pump changes or valve position and therefore not unusual to have higher or lower than normal flows.

Comparison of Actual to System Approved Flow

Flow rates as set in the Municipal Drinking Water Licence # 007-105 and Drinking Water Works Permit # 007-205.

Maximum daily flow: 44.000 ML
Maximum flow rate: 44.000 ML/day

Date Average Day Treated (ML) % of Rated Capacity Maximum Day Treated (ML) % of Rated Capacity Maximum Flow Rate Treated (ML/d) % of Rated Capacity
Jan 13.232 30.1% 20.014 45.5% 15.656 35.6%
Feb 12.859 29.2% 13.675 31.1% 17.109 38.9%
Mar 12.902 29.3% 14.086 32.0% 18.958 43.1%
Apr 12.755 29.0% 14.655 33.3% 18.045 41.0%
May 13.642 31.0% 15.65 35.6% 18.546 42.2%
Jun 15.240 34.6% 18.333 41.7% 21.935 39.3%
Jul 17.891 40.7% 20.744 47.1% 25.175 57.2%
Aug 15.863 36.1% 19.098 43.4% 23.062 52.4%
Sep 14.466 32.9% 16.323 37.1% 19.23 43.7%
Oct 13.250 30.1% 14.926 33.9% 18.051 41.0%
Nov 13.075 29.7% 14.125 32.1% 17.453 39.7%
Dec 12.958 29.5% 13.959 31.7% 17.761 40.4%
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