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Table F-16. Groundwater pH Data for Excavation Sequencing Area J <br />Project No. 110207, Everett, Washington <br />No Downgradient Wells <br />Date TM-MW-6 REC6-MW-2 MW-6 <br />10/1/2020 7.35 6.96 7.20 <br />10/5/2020 7.52 7.22 7.29 <br />10/7/2020 7.57 7.20 7.34 <br />10/9/2020 7.55 7.18 7.32 <br />Average Baseline 7.50 7.14 7.29 <br />"Trigger pH"8.00 7.64 7.79 <br />10/12/2020 7.21 6.99 7.17 <br />10/19/2020 7.22 6.67 7.20 <br />10/28/2020 7.18 6.66 7.22 <br />11/2/2020 7.15 6.67 7.10 <br />11/12/2020 7.18 6.75 7.06 <br />Notes <br />"Trigger pH" for proximal wells is the pH that, if exceeded for 3 weeks, triggers daily monitoring of proximal <br />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 />Baseline Readings for this Sequencing Area (3x in 1 week) <br />Weekly (at least) Compliance Readings During CM Removal in <br />this Sequencing Area <br />Weekly (at least) Compliance Readings for 3 Weeks After CM <br />Removal is Done in this Sequencing 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-16 <br />Report for Second Interim Action <br />Page 1 of 1