Building Review



Public Works Storm Water
Review No:1 Application with civil plans, Stormwater Management Report by R.I. Engineering dated June 2024 has been received. The following conditions of approval shall be addressed and items provided prior to building permit issuance: 1) Provide Final Project Information and Threshold Form (see CDC Part 3 Appendix A). Please update this form to include the impervious areas proposed (sidewalk, walkways, driveway, patios, etc.) at the project frontage on North Avenue. 2) Appendix D of Part of the CDC lists all items that shall be provided by large building permit proposals. a) Final Stormwater Management Report with all required elements: - The report shall be updated to describe the source control measures incorporated in the project design. - Provide final detention sizing and flow control analysis that is consistent with project plans and accounts for new/replaced impervious areas (on and off site) that bypass the detention mitigation. - Provide final retention storage analysis based on either site specific soil permeability testing or conservative use of USDA-NRCS soil survey for the depth of the proposed retention facility (available at: Soil Survey of Santa Cruz County, California (1980)). This may be different for the retention structure and the design of the landscape strip mitigation as the depths are different. - Provide analysis demonstrating the drainage facilities proposed for rerouting upstream runoff (proposed swales, undersidewalk drains, and curb flows along North Ave.) are adequate for design and overflow storms. - Provide analysis utilizing SWM Figures 6 and 7 for the proposed storm drain in North Avenue demonstrating compliance with the CDC. b) Stormwater Management Plan – See Appendix D for all items required, including: - Please provide spot and detail/s for the rock erosion protection at the end of the swale at Norwest corner. - Provide a detail/s describing how the subdrain from the permeable paver area west of the building will tie into the detention/retention system. - Show inspection and maintenance access locations for the underground retention/detention system on sheet C-2 and detail 3/C-4. - Provide invert elevations in detail 3/C-2 and update cover notes to be consistent with plan for permeable pavers. Update sheet C-1 to clarify paver extent over the mitigation area. - Please include a note on the plans that states that no interior drains shall be directed to the storm drain system. - Provide details for how retaining walls will drain – these facilities shall not impact the functionality of the stormwater mitigation features. - Update Detail 7/C-4 to include the requirement for surface infiltration testing and specify minimum acceptable infiltration rate with results to be provided to the County inspector prior to project acceptance. - Provide detail and specifications for landscape strip mitigation consistent with the analysis. c) Maintenance A recorded stormwater facilities maintenance agreement (SWM25B) is required. Please provide a draft agreement with attachments for review prior to building permit approval. The agreement shall include the required map, maintenance schedule, signs of system failure, etc. per the CDC. The map and detailed maintenance shall include the offsite inlets, storm drain pipes, signage, and landscape mitigation strip proposed within the non County maintained roadways. The agreement shall include test method and minimum acceptable surface infiltration rate for the pervious pavement areas and landscape mitigation areas that shall be conducted at least once a year as well as methods to be used and indication as to when cleaning, restoration and replacement are required. The agreement shall include maintenance of the swale and outlet stability at the Northwest corner of the site. Given the flow control structure is proposed to be located more than 8 feet below grade provide specific methods to be used to inspect and clean out orifice as well as the detention/retention chambers. If a vactor truck will be required for maintenance how will it access the site? Photo documentation for the rip rap outlet at the NW corner and of the cleaned and clear orifice will be required each year with the annual report. If guidance will reference manufacturer suggested maintenance the maintenance guidelines shall be included in the recorded document. The agreement shall include acknowledgement of annual reporting and oversight fee. The final recorded document will be required prior to building permit final/occupancy. A hold will be placed on the permit for the final document. 3) Provide final landscape plans that are consistent with the final civil plans. Preliminary plans showed discrepancies regarding surfacing. 4) Provide review letter from the project Geotechnical Engineer approving of the final civil grading and drainage plans. The review letter shall specifically approve the design for consistency with recommendations 10-14 from the 9/10/19 geotechnical investigation. 5) Public Works staff will inspect the construction of the drainage related items. Please provide engineer’s estimate for the construction of the drainage items (there is a 3% inspection fee). A hold will be placed on the building permit for a preconstruction meeting with the Public Works Construction Engineer (please call at least 72 hours prior to construction to schedule the preconstruction meeting at 831.454.2160). A second hold will be made for approval of the final construction by the Public Works Construction Inspector. 6) As-built digital file for all drainage facilities shall be submitted prior to permit final and occupancy. The submittal shall contain the following criteria: Projection: State Plane Coordinate System - California III - Feet Horizontal Datum: NAD 83 Vertical Datum: NAVD 88 Any CAD is acceptable. AutoCAD is preferred. All changes shall be dated and clouded. For significant field changes change order permit applications may be required. 7) Zone 6 impervious area impact fees will be assessed based on the net increase in permitted impervious areas. These fees will be assessed at building permit issuance.

Public Works Storm Water

Review No:1

Application with civil plans, Stormwater Management Report by R.I. Engineering dated June 2024 has been received. The following conditions of approval shall be addressed and items provided prior to building permit issuance:

1) Provide Final Project Information and Threshold Form (see CDC Part 3 Appendix A).

Please update this form to include the impervious areas proposed (sidewalk, walkways, driveway, patios, etc.) at the project frontage on North Avenue.

2) Appendix D of Part of the CDC lists all items that shall be provided by large building permit proposals.

a) Final Stormwater Management Report with all required elements:

- The report shall be updated to describe the source control measures incorporated in the project design.

- Provide final detention sizing and flow control analysis that is consistent with project plans and accounts for new/replaced impervious areas (on and off site) that bypass the detention mitigation.

- Provide final retention storage analysis based on either site specific soil permeability testing or conservative use of USDA-NRCS soil survey for the depth of the proposed retention facility (available at: Soil Survey of Santa Cruz County, California (1980)). This may be different for the retention structure and the design of the landscape strip mitigation as the depths are different.

- Provide analysis demonstrating the drainage facilities proposed for rerouting upstream runoff (proposed swales, undersidewalk drains, and curb flows along North Ave.) are adequate for design and overflow storms.

- Provide analysis utilizing SWM Figures 6 and 7 for the proposed storm drain in North Avenue demonstrating compliance with the CDC.

b) Stormwater Management Plan – See Appendix D for all items required, including:

- Please provide spot and detail/s for the rock erosion protection at the end of the swale at Norwest corner.

- Provide a detail/s describing how the subdrain from the permeable paver area west of the building will tie into the detention/retention system.

- Show inspection and maintenance access locations for the underground retention/detention system on sheet C-2 and detail 3/C-4.

- Provide invert elevations in detail 3/C-2 and update cover notes to be consistent with plan for permeable pavers. Update sheet C-1 to clarify paver extent over the mitigation area.

- Please include a note on the plans that states that no interior drains shall be directed to the storm drain system.

- Provide details for how retaining walls will drain – these facilities shall not impact the functionality of the stormwater mitigation features.

- Update Detail 7/C-4 to include the requirement for surface infiltration testing and specify minimum acceptable infiltration rate with results to be provided to the County inspector prior to project acceptance.

- Provide detail and specifications for landscape strip mitigation consistent with the analysis.

c) Maintenance

A recorded stormwater facilities maintenance agreement (SWM25B) is required. Please provide a draft agreement with attachments for review prior to building permit approval. The agreement shall include the required map, maintenance schedule, signs of system failure, etc. per the CDC. The map and detailed maintenance shall include the offsite inlets, storm drain pipes, signage, and landscape mitigation strip proposed within the non County maintained roadways. The agreement shall include test method and minimum acceptable surface infiltration rate for the pervious pavement areas and landscape mitigation areas that shall be conducted at least once a year as well as methods to be used and indication as to when cleaning, restoration and replacement are required. The agreement shall include maintenance of the swale and outlet stability at the Northwest corner of the site. Given the flow control structure is proposed to be located more than 8 feet below grade provide specific methods to be used to inspect and clean out orifice as well as the detention/retention chambers. If a vactor truck will be required for maintenance how will it access the site? Photo documentation for the rip rap outlet at the NW corner and of the cleaned and clear orifice will be required each year with the annual report. If guidance will reference manufacturer suggested maintenance the maintenance guidelines shall be included in the recorded document. The agreement shall include acknowledgement of annual reporting and oversight fee. The final recorded document will be required prior to building permit final/occupancy. A hold will be placed on the permit for the final document.

3) Provide final landscape plans that are consistent with the final civil plans. Preliminary plans showed discrepancies regarding surfacing.

4) Provide review letter from the project Geotechnical Engineer approving of the final civil grading and drainage plans. The review letter shall specifically approve the design for consistency with recommendations 10-14 from the 9/10/19 geotechnical investigation.

5) Public Works staff will inspect the construction of the drainage related items. Please provide engineer’s estimate for the construction of the drainage items (there is a 3% inspection fee). A hold will be placed on the building permit for a preconstruction meeting with the Public Works Construction Engineer (please call at least 72 hours prior to construction to schedule the preconstruction meeting at 831.454.2160). A second hold will be made for approval of the final construction by the Public Works Construction Inspector.

6) As-built digital file for all drainage facilities shall be submitted prior to permit final and occupancy. The submittal shall contain the following criteria: Projection: State Plane Coordinate System - California III - Feet Horizontal Datum: NAD 83 Vertical Datum: NAVD 88 Any CAD is acceptable. AutoCAD is preferred. All changes shall be dated and clouded. For significant field changes change order permit applications may be required.

7) Zone 6 impervious area impact fees will be assessed based on the net increase in permitted impervious areas. These fees will be assessed at building permit issuance.

CDI - Application Status