D1.2.2 Provide: Regular site Evidence of See inspections break-ins or Contingency locked perimeter with checks on damage. Plan. access/ locked access towers security vandalism/ Unexplained Determine and ladders measures. sabotage. change in how access locked hatches on FAC. water was obtained tanks quality. and rectify intruder alarm. shortcoming in quality. FAC residual security. Maintain chlorine less than residual. 0.2 mg/L and Isolate tank, cannot be chlorinate and maintained. check the E. coli or quality. If coliforms there is gross detected in contamination, 100 mL of dump the water. water, clean and refill before chlorinating. D1.2.3 Train personnel who Isolate tank, need access to tanks. quality. of water chlorinate and access quality check the for sampling, Design internal walkways Reservoir following etc. that do not become construction. operation quality. If submerged with a solid involving there is gross floor and raised edges to tank access, contamination, avoid shoe scrapings in particular dump the entering the water. E. coli or water, clean Maintain chlorine coliforms and refill residual. detected in before 100 mL of chlorinating. Isolation of tank. water. Procedures for staff entering tanks to clean footwear, then to cover their shoes with clean plastic bags, or to go through a chlorinated foot-bath. Test sampling staff to ensure they are not carriers of water-borne disease, and relieve them of sampling duties if necessary. D1.2.4 Specify materials Replace Conduct certified for potable regular Leaching/ water use2 in tenders and materials. inspection of corrosion check these tanks. from specifications are being construction Check met during construction. materials. residence Use accredited times. contractors. If roof is Low residence time of unlined – water in tanks (while copper/ maintaining disinfection chromium/ contact time). arsenic
D1.2.2 access/ vandalism/ sabotage. Provide: locked perimeter locked access towers and ladders locked hatches on tanks intruder alarm. Maintain chlorine residual. Regular site inspections with checks on security measures. FAC. quality. Evidence of break-ins or damage. Unexplained change in water quality. FAC residual less than 0.2 mg/L and cannot be maintained. E. coli or coliforms detected in 100 mL of water. See Contingency Plan. Determine how access was obtained and rectify shortcoming in security. Isolate tank, chlorinate and check the quality. If there is gross contamination, dump the water, clean and refill before chlorinating. D1.2.3 access for sampling, etc. Train personnel who need access to tanks. Design internal walkways that do not become submerged with a solid floor and raised edges to avoid shoe scrapings entering the water. Maintain chlorine residual. Isolation of tank. Procedures for staff entering tanks to clean footwear, then to cover their shoes with clean plastic bags, or to go through a chlorinated foot-bath. Test sampling staff to ensure they are not carriers of water-borne disease, and relieve them of sampling duties if necessary. quality. Reservoir construction. of water quality following operation involving tank access, in particular E. coli or coliforms detected in 100 mL of water. Isolate tank, chlorinate and check the quality. If there is gross contamination, dump the water, clean and refill before chlorinating. D1.2.4 Leaching/ corrosion from construction materials. Specify materials certified for potable water use2 in tenders and check these specifications are being met during construction. Use accredited contractors. Low residence time of water in tanks (while maintaining disinfection contact time). Conduct regular inspection of tanks. Check residence times. If roof is unlined – copper/ chromium/ arsenic Replace materials.