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DISTRIBUTION SYSTEM INVESTIGATION CORRECTIVE ACTIONS: Make required corrections to the system to eliminate the entrance of bacteria into the system . Flush system and all dead end lines with clean well water. Disinfect the system with NSF 61 approved chlorine at 100 opm for a contact period of at least 3 , but not more than 24 hours at 10 ppm , per AWWA standards. Ensure every hose bib, faucet, toilet, shower, and any dead end line is flushed with a 100 ppm residual, by testing each site using a field test kit or for a chlorine odor where testing is not practical . Test for a 100 ppm chlorine residual , after two hours through out the system. If the residual tests below 100 ppm , increase the concentration to back 100 ppm . A successful disinfection requires a residual of 100 ppm to be present after the 3 hours, or at least 10 ppm after 24 hour contact period . If the residual is found to be non-detectable ( ND) at a location , with 50-10 ppm at other locations, or with ND residuals through out the system , then the disinfection process may not have been successful . This may be an indication of where bacteria are entering into the system . Repeat the investigation , flushing , and disinfection processes. After the disinfection process, flush the system until it tests non-detect for chlorine residuals. Resample by directing your laboratory to collect "Other" samples and test for chlorine residuals and TC bacteria , using enumeration test methods from locations that were effected. NOTE: The month following a TCR MCL, you are to direct your laboratory to collect 5 ROUTINE samples and have them test for chlorine residuals and TC bacteria , using enumeration test method. If the DISTRIBUTION SYSTEM Continues to Fails , contact the EHD for guidance at (209) 468-3420. SUMMARY: Provide a report of the investigation that includes the cause of the TCR MCL, the physical repairs that were made to the system to eliminate the entrance of bacteria into the system , and the disinfection process that eliminated the presence of bacteria, and returned the system to compliance with the TCR: INVESTIGATION FINDINGS: REPAIRS MADE, OR TO BE MADE, TO EXLUDE THE ENTRANCE OF BACTERIA AND DATE OF THE CORRECTION: DISINFECTION PROCESS: Submit this completed form to the EHD, by fax at (209) 468-0341 , or Mail to SJC-EHD , SPWS Program, 1816 Hazelton Ave, Stockton Ca, 95205, within 30 days of the system failing the TCR, along with additional TC results that indicate the system is now incompliance with the TCR. Failure to submit form will result in a Procedural Violation fee of $250. Page 6 of 6