Provide indirect Minimum Establish heating for drum temperature reason for storage and less than 10C. low chlorinator rooms to temperature ensure chlorine is and rectify. kept gaseous in supply lines (gas chlorination). Ensure chlorinator is Maximum Replace designed to provide chlorine dose chlorinator enough chlorine to rate that can be with one with meet the maximum delivered too sufficient required dose. low. capacity. Ensure adequate Establish pressure for injector reason for venturi by: poor injector pressure good hydraulics and rectify. design use of a booster pump. NOT ENOUGH FREE AVAILABLE CHLORINE cont’d P7.1.1.9 Many of the causes FAC. FAC Take steps and preventative concentration is noted in Inadequate measures noted in less than output from quality. P7.1.1.1–P7.1.1.8 for 0.2 mg/L. as chlorine chlorination at the appropriate. booster E. coli or treatment plant are stations (if coliforms Adjust dose also applicable to used). detected in setting. chlorine boosting in 100 mL sample the distribution of water leaving system. Refer to the treatment these. plant. Put in place either manual monitoring or in-line monitoring of the FAC residual to provide reliable control of the booster dose rate. P7.1.1.10 Provide staff training Records of Monitoring Identify for sample analysis FAC analysis inaccuracies. FAC and record keeping. results. in staff monitoring training and samples Develop monitoring rectify. incorrectly or schedule and roster. incorrectly recorded (see Guide D4). P7.1.1.11 Provide training Records of Monitoring Identify for sample analysis FAC analysis inaccuracies. Method of FAC and record keeping. results. in staff measurement training and incorrect, rectify. incorrectly calibrated, or analysis reagents have deteriorated.
Provide indirect heating for drum storage and chlorinator rooms to ensure chlorine is kept gaseous in supply lines (gas chlorination). Minimum temperature less than 10C. Establish reason for low temperature and rectify. Ensure chlorinator is designed to provide enough chlorine to meet the maximum required dose. Ensure adequate pressure for injector venturi by: good hydraulics design use of a booster pump. Maximum chlorine dose rate that can be delivered too low. Replace chlorinator with one with sufficient capacity. Establish reason for poor injector pressure and rectify. NOT ENOUGH FREE AVAILABLE CHLORINE cont’d P7.1.1.9 Inadequate output from chlorine booster stations (if used). Many of the causes and preventative measures noted in P7.1.1.1–P7.1.1.8 for chlorination at the treatment plant are also applicable to chlorine boosting in the distribution system. Refer to these. Put in place either manual monitoring or in-line monitoring of the FAC residual to provide reliable control of the booster dose rate. FAC. quality. FAC concentration is less than 0.2 mg/L. E. coli or coliforms detected in 100 mL sample of water leaving the treatment plant. Take steps noted in as appropriate. Adjust dose setting. P7.1.1.10 FAC monitoring samples incorrectly or incorrectly recorded (see Guide D4). Provide staff training for sample analysis and record keeping. Develop monitoring schedule and roster. Records of FAC analysis results. Monitoring inaccuracies. Identify in staff training and rectify. P7.1.1.11 Method of FAC measurement incorrect, incorrectly calibrated, or analysis reagents have deteriorated. Provide training for sample analysis and record keeping. Records of FAC analysis results. Monitoring inaccuracies. Identify in staff training and rectify.