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Table F-12. Groundwater pH Data for Excavation Sequencing Area N <br />Project No. 110207, Everett, Washington <br />Date CN-MW-101 TM-MW-5 NRU-MW-102 NRS-MW-102 REC7-MW-2 TM-MW-6 <br />9/8/2020 6.52 7.68 7.12 6.56 6.85 7.37 <br />9/9/2020 6.59 7.49 6.89 6.67 6.86 7.34 <br />9/10/2020 6.56 7.56 6.91 6.54 6.89 7.31 <br />Average Baseline 6.56 7.58 6.97 6.59 6.87 7.34 <br />"Trigger pH"7.06 8.08 7.47 7.09 7.37 7.84 <br />9/28/2020 6.57 7.50 <br />10/1/2020 8.05 <br />10/2/2020 6.57 7.45 <br />10/5/2020 6.56 7.41 <br />10/12/2020 6.50 7.67 <br />10/19/2020 6.56 7.38 <br />Notes <br />"Trigger pH" for proximal wells is the pH that, if exceeded for 3 weeks, triggers daily monitoring of <br />proximal well and start monitoring of downgradient wells. <br />"Trigger pH" for downgradient wells is the pH that, if exceeded for 1 week, triggers consultation with <br />Ecology regarding response action. <br />pH Reading in Standard Units <br />Proximal Wells <br />Downgradient Wells <br />to Monitor if pH Increase >0.5 unit is Observed in <br />Proximal Well(s) <br />Baseline Readings for this Sequencing Area (3x in 1 week) <br />Weekly (at least) Compliance Readings During CM Removal in this Sequencing Area <br />Weekly (at least) Compliance Readings for 3 Weeks After CM Removal is Done in this Sequencing <br />Area <br />Aspect Consulting <br />12/17/2020 <br />V:\110207 KC Everett Mill\Deliverables\Interim Action Report 2020\Client Review Draft\App F pH monitoring\Appendix F pH Data Tables <br />Table F-12 <br />Report for Second Interim Action <br />Page 1 of 1