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Bridge Point Everett 500, LLC ES-4011.08 <br /> June 27, 2022 Page 3 <br /> ESNW Response — As confirmed by the undersigned engineer during the ongoing mass <br /> excavation activities, very dense glacial till (self-supporting) has been confirmed along the <br /> alignment of the proposed rockeries. In any case, we have revised the rockery sheet to specify <br /> very dense till and verification by the engineer. <br /> Comment 8 - The cut section indicates a maximum height of 16 feet. However, the elevations <br /> for the soil nail construction drawings indicate retained heights that may exceed 16 feet. In <br /> addition, it is not clear if the soil nail wall extends below grade or is entirely above it, which may <br /> add another foot for the required rockery embedment depth. The rockery design should be <br /> reviewed and the extent reduced as needed. <br /> ESNW Response —We have increased the maximum cut rockery height allowable to 18 feet. In <br /> this way, a taller section can be accommodated (if necessary)where the soil nail wall and rockery <br /> transitions occur. With respect to the soil nail wall embedment, typically the toe of the wall is <br /> buried, but not necessarily required for stability. In any case, the soil nail wall designer will <br /> address the pertinent part of this comment. <br /> Comment 9 - TESC Sheet D-1.3 shows a "Storm Chamber System #1" directly in front of the <br /> rockery. The design and depth of this system is not clear. It is anticipated to extend at least <br /> several below grade. It is not clear that this system has the capacity to support surcharge loads <br /> from the rockery foundation bearing loads, which would require the rockery to be extended <br /> deeper into the soil and further increase the over-height walls. This condition should be reviewed <br /> and the wall design revised as needed. <br /> ESNW Response — We have reviewed the storm chamber design and proximity to the rockery. <br /> Given the very dense geology (glacial till) and the anticipated storm chamber depth, the planned <br /> excavation work and construction can be accomplished without compromising the rockery <br /> integrity. Further, with respect to stress trajectory (and given the very dense glacial till geology), <br /> surcharge loads from the rockery structure will not be imparted to the storm chamber. <br /> Comment 10 - The soil nail walls are flanked by rockery walls at each end. See "Rockery Wall" <br /> Comment 3 above. The soil nail walls may need to be extended. <br /> ESNW Response — We understand the soil nail wall designer will address this comment. <br /> Comment 11 - TESC Sheet D-1.3 shows a "Storm Chamber System #1" directly in front of the <br /> wall. The design and depth of this system is not clear. It is anticipated to extend at least several <br /> below grade. The impact of this system on the wall design is not clear. This condition should be <br /> reviewed and the wall design revised as needed. <br /> ESNW Response — As indicated in our response to Comment 9 above, we have reviewed the <br /> storm chamber design and proximity to the rockery. Given the very dense geology (glacial till) <br /> and the anticipated storm chamber depth, the planned excavation work and construction can be <br /> accomplished without compromising the rockery integrity. Further, with respect to stress <br /> trajectory (and given the very dense glacial till geology), surcharge loads from the rockery <br /> structure will not be imparted to the storm chamber. <br /> Earth Solutions NW, LLC <br />