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As seen in Table 2, multiple wells tested above the Notification Level for PFOS at the <br /> time of testing. As a result, City Council was notified by memorandum on February 13, <br /> 2019 and May 30, 2019 as required by law. Additionally, the voluntary test data <br /> conducted in 2018 was included in the City's 2018 CCR as recommended by the DDW. <br /> Table 2 — Zone 7 Testing <br /> Well Location Voluntary (ppt) 1st Quarter (ppt) 2nd Quarter (ppt) <br /> Dec 18 — Jan 19 April 19 - June 19 July 19 - Sept19 <br /> PFOS <br /> COL 1 29 29 44 <br /> COL 2 14 12 15 <br /> COL 5 29 52 42 <br /> Mocho 1 82 93 73 <br /> Mocho 2 N/D 48 26 <br /> Mocho 3 28 32 35 <br /> Mocho 4 9 4 12 <br /> Stoneridge 9 5 12 <br /> PFOA <br /> COL1 4 4 6 <br /> COL 2 3 N/D 3 <br /> COL 5 N/D 2 2 <br /> Mocho 1 8 10 8 <br /> Mocho 2 N/D 6 5 <br /> Mocho 3 6 6 6 <br /> Mocho 4 3 3 3 <br /> Stoneridge N/A N/D 2 <br /> PFOS & PFOA Combined <br /> COL 1 33 33 50 <br /> COL 2 17 12 18 <br /> COL 5 29 54 44 <br /> Mocho 1 90 103 81 <br /> Mocho 2 N/D 54 31 <br /> Mocho 3 34 38 41 <br /> Mocho 4 12 7 15 <br /> Stoneridge N/A 5 14 <br /> Only the Mocho-1 Well tested above the combined PFOA and PFOS Response Level. <br /> As a result, Zone 7 immediately made the well the last to operate to meet water <br /> demands. When required to operate, the well will be blended with other wells so that <br /> concentrations are below the Response Level or it will be treated by the Mocho <br /> Groundwater Demineralization Facility, which has shown that it can reduce <br /> concentrations by at least 95 percent. <br /> City Testing and Follow-Up Actions <br /> The City began testing of its groundwater wells as part of the DDW order issued on <br /> March 15, 2019. Table 3 provides a summary of the Quarter 1 and 2 test results. <br /> Page 8 of 13 <br />