Laserfiche WebLink
Table F-15. Groundwater pH Data for Excavation Sequencing Area I <br />Project No. 110207, Everett, Washington <br />No Downgradient Wells <br />Date LP-MW-2 SHB-MW-2 <br />10/5/2020 6.95 7.13 <br />10/6/2020 6.92 7.14 <br />10/7/2020 7.17 7.16 <br />Average Baseline 7.01 7.14 <br />"Trigger pH"7.51 7.64 <br />10/9/2020 7.02 7.13 <br />10/12/2020 6.57 6.66 <br />10/19/2020 6.55 6.87 <br />10/28/2020 6.65 6.89 <br />11/2/2020 6.60 6.87 <br />Notes <br />pH Reading in Standard Units <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 />Proximal Wells <br />Baseline Readings for this Sequencing Area (3x <br />in 1 week) <br />Weekly (at least) Compliance Readings During <br />CM Removal in this Sequencing Area <br />Weekly (at least) Compliance Readings for 3 <br />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-15 <br />Report for Second Interim Action <br />Page 1 of 1