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Table F-11. Groundwater pH Data for Excavation Sequencing Area K <br />Project No. 110207, Everett, Washington <br />Date TM-MW-5 LP-MW-1 TM-MW-6 REC6-MW-2 MW-6 <br />9/8/2020 7.68 7.18 7.37 7.00 7.13 <br />9/9/2020 7.49 7.27 7.34 7.02 7.14 <br />9/10/2020 7.56 7.26 7.31 7.01 7.19 <br />Average Baseline 7.58 7.24 7.34 7.01 7.15 <br />"Trigger pH"8.08 7.74 7.84 7.51 7.65 <br />9/22/2020 7.60 7.20 <br />9/28/2020 7.50 9.72 <br />9/29/2020 10.52 <br />10/1/2020 8.05 10.84 7.35 6.96 7.20 <br />10/2/2020 7.45 10.85 <br />10/5/2020 7.43 11.24 7.52 7.22 7.29 <br />10/7/2020 7.50 11.31 7.57 7.20 7.34 <br />10/9/2020 7.41 11.38 7.55 7.18 7.32 <br />10/12/2020 7.67 11.60 7.21 6.99 7.17 <br />Notes <br />Red highlighted values exceed Trigger pH value. <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 <br />Observed in 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 <br />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-11 <br />Report for Second Interim Action <br />Page 1 of 1