1622 E MARINE VIEW DR WHOLE SITE 2022-02-01

Riverview Apartments July 78, 2079 Response to Public Works Permit Comments age 2 of 4 CPH No. 0024-17-037; City File No. P W 1906-074 -- c� Sheet C3.00-Remediation Plan. Construction Notes reference "Remediation Notes", however that notes section is actually titled "Bioremediation Notes" in both Construction note 5 and 7. Which is correct? Update the plans to be consistent in cross references. Response: The title has been revised to "Remediation Notes". The existing 48-inch sewer was recently potholed as part of this remediation project (under a separate permit). The results of the potholing need to be reflected on the plans. Please show the sewer main in its full width (to scale) to show the actual utility and its proximity to the proposed shoring wall, as identified in the field. Call out the distance from the edge of the pipe to the shoring wall. The City recommends separation of at least 3ft between the edge of the drilled pile hole and the side of the sewer pipe trench, which it assumed to be approximately 7ft wide in total, centered on the pipe, per record drawings. Response: The pothole information has been added to the plan(s) along with linework to estimate the total 7-foot wide trench centered on the pipe. As shown, the nearest edge of the 2-foot diameter piles maintain a minimum 3-foot clearance to the outside of the sewer trench (i.e., nearest pile is approximately 3.5 feet clear of trench edge). Installation of the drilled piles and timber lagging will occur from the private property side of the work zone to further protect existing utilities during construction. Reme iation Action Plan report -Page 17. Section 4.4.3.4 Utilities of the report discusses "an emergency sewer bypass will be needed for excavation options that affect the integrity of the 48-inch-diameter sewer line" and states that "Other utilities will be temporarily or permanently removed from the areas of excavation and relocated as needed. See Plate 3 for the approximate location of all known utilities in the project areas" 1� Is the emergency bypass for the sewer anticipated? If not, is still a possibility or is this for a different scenario that was not selected? Please clarify. This is not currently shown on the civil remediation plans, and would need to be shown if it is an option, even as an alternative on a separate sheet. Response: An emergency bypass for the existing combined sewer main at the western edge of East Marine View Drive is not anticipated for the selected remediation alternative. The selected remedial alternative in the updated Remedial Action Plan (RAP) was Alt 3A which was further modified so that the soldier pile shoring and excavation will avoid all utilities. The selected remedial alternative is named "Alt-3A Mod" in the revised RAP and is shown o ate 12 and described in Section 4-7. T e—previously submitted RAP was completed prior to completion oft e s oring design and current onsite excavation and right-of- way bioremediation. The enclosed updated RAP has been corrected accordingly. Are the other utilities going to be removed and/or relocated? If so, they need to be shown on the civil remediation plans. Please clarify and update plans as necessary. Response: As noted in the above response, the shoring and excavation were located to avoid disturbance to the 48-inch combined sewer and all existing utilities. No utilities are planned to be removed or relocated as part of this work. A concrete encased utility duct bank containing buried power and communication lines is located between the shoring wall and the existing 48-inch sewer line. This duct bank will be protected from disturbance during construction. The enclosed updated RAP has been corrected as necessary.