To: Members of the Castle Rock Water Commission
From: Mark Marlowe, P.E., Director of Castle Rock Water
Title
Results from the 2021 Sanitary Survey
Town Council Agenda Date: NA
Body
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Executive Summary
The Colorado Department of Public Health and Environment Water Quality Control Division (CDPHE WQCD) conducted a Sanitary Survey for Castle Rock Water on September 29th and 30th of 2021. These surveys ensure that entities are producing and distributing safe drinking water. Sanitary Surveys are required by Section 11.38 of Regulation 11 - Colorado Primary Drinking Water Regulations 5 CCR 1002-11. This survey included remote document reviews and on-site inspections by CDPHE inspectors Paul Kosik and Clayton Moores.
The remote document review focused on the following items:
• Cross Connection Control Program
• Annual Cross Connection Control Reports (last 3 years)
• Tracking spreadsheet for Backflow Prevention and Cross Connection Control (BPCCC) program (last 3 years)
• Storage Tank Program Plan
• Storage Tank Periodic Inspections (last 3 years)
• Storage Tank Comprehensive Inspections (last one if done)
• Monitoring Plan including a system diagram with sampling locations
• Ground Water Entry Point Chlorine Residual Logs (last 6 months - year)
• Calibration logs for turbidimeters if Surface Water System (last year)
• June 2019 turbidity data used for Monthly Operating Reports (MOR) for Surface Water System
• Secondary check for chlorine analyzers (last 2 years)
• Lab results for 2012 Nitrate, Last 6 months Total Coliform /Escherichia Coliform slips
• Regulation 100 delegation of duties operation plan
• Provide an updated inventory of all water treatment plant equipment, processes, and chemicals used for producing safe drinking water.
During the physical on-site inspection, the inspectors visited each of the Town’s five water treatment plants,13 storage tanks, and multiple wells and pump stations. They inspected each site to ensure that conditions were satisfactory for sanitary water production, storage, and distribution. They also tested the water at each location to ensure that the disinfection readings matched local instrumentation. At the water treatment plants, every basin hatch was opened and inspected for seal integrity and evidence of insect infestation. CR Water has over one hundred basin hatches, and no insect evidence in the hatches was found.
During this year’s survey, the inspectors found no major discrepancies or violations. They did offer several recommendations, which are required to be addressed within one year.
The following items were addressed within two weeks and documentation sent to CDPHE:
• Staff added 16 mesh screen to all HVAC inlets, outlets, and vents at all water treatment plants.
• Staff updated 13 Ray Waterman Water Treatment Plant basin vents to the newly adopted candy cane style vents.
• Staff replaced a failed door sweep at the Founders Water Treatment Plant.
• Staff made CDPHE requested improvements to the Comprehensive Storage Tank Inspection plan:
o It now includes procedures for selecting qualified tank inspectors and documenting the names of the inspectors within the plan.
o Staff added timelines to the Comprehensive Storage Tank Inspection plan for repairs; if and when deficiencies are discovered.
o Staff provided exact information to the Comprehensive Storage Tank Inspection plan relating to the types and sizes of the tank overflow/drain flapper valves and listings of the exact types of tank hatches and hatch seals.
The last survey occurred in 2017, and previously in 2013, the results of those surveys also included no violations or deficiencies.