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Table F-17. Groundwater pH Data for Excavation Sequencing Area O <br />Project No. 110207, Everett, Washington <br />Date NRU-MW-102 NRS-MW-102 REC7-MW-2 TM-MW-6 <br />10/8/2020 6.96 7.05 6.99 7.54 <br />10/9/2020 6.99 7.09 6.93 7.55 <br />10/12/2020 7.04 6.91 6.64 7.21 <br />Average Baseline 7.00 7.02 6.85 7.43 <br />"Trigger pH"7.50 7.52 7.35 7.93 <br />10/19/2020 7.00 7.03 6.65 7.22 <br />10/28/2020 7.02 7.05 6.68 7.18 <br />11/2/2020 6.96 6.92 6.66 7.15 <br />11/12/2020 7.00 6.94 7.33 7.18 <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 Ecology <br />regarding response action. <br />pH Reading in Standard Units <br />Proximal Wells No Downgradient <br />Wells <br />Baseline Readings for this Sequencing Area (3x in 1 week) <br />Weekly (at least) Compliance Readings During CM Removal in this Sequencing <br />Area <br />Weekly (at least) Compliance Readings for 3 Weeks After CM Removal is Done <br />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-17 <br />Report for Second Interim Action <br />Page 1 of 1