Permit Review Detail
Review Status: Completed
Review Details: RESUBMITTAL - SITE ALL
Permit Number - T05CM01524
Review Name: RESUBMITTAL - SITE ALL
Review Status: Completed
| Review Date | Reviewer's Name | Type of Review | Description | Status | Comments |
|---|---|---|---|---|---|
| 05/10/2005 | EGRANT1 | FIRE | REVIEW | Needs Review | |
| 05/10/2005 | EGRANT1 | NPPO | REVIEW | Needs Review | |
| 05/10/2005 | EGRANT1 | LANDSCAPE | REVIEW | Needs Review | |
| 05/10/2005 | EGRANT1 | ZONING HC SITE | REVIEW | Needs Review | |
| 05/10/2005 | EGRANT1 | ZONING | REVIEW | Needs Review | |
| 05/11/2005 | DOUG WILLIAMS | ENGINEERING | REVIEW | Denied | SUBJECT: Drainage Report, Site, Grading, and Stormwater Pollution Prevention plan review DATE: 16 May 2005 ACTIVITY NUMBERS: T05BU00798/T05CM01524 T14S, R13E, Section 9 Engineering Division has reviewed the Subject items. Approvals are not recommended at this time. A separate Hillside Development Zone (HDZ) application, submittal, and review will be required. The watercourse adjacent to this site is designated as a Watercourse Amenities Safety and Habitat (W.A.S.H.) Ordinance wash. Recent changes have occurred pertaining to all W.A.S.H. report submittals and reviews, that may affect this project. Contact Zoning Review Supervisor Patricia Gehlen at 791-5608 for questions pertaining to application/submittal requirements for these Overlay Zones. Please provide revised site, grading and SWPP plans, and a revised Drainage Report addressing the comments provided, and include a response letter discussing how each comment has been addressed in detail. DRAINAGE REPORT: 1. Please specify in the report, the name, address and telephone # of the person(s), firm(s), agency or agencies responsible for the ownership, operation, scheduled and unscheduled maintenance, and liability of the drainage improvements described in the report. List any other documents where these responsibilities are documented, in accordance with Section 2.3.1.2 E of the City of Tucson's Standards Manual For Drainage Design and Floodplain Management (Development Standard -DS- 10-02.0). 2. It appears all losses are not included in the Hydraulic Grade Line calculations. Please check to assure all hydraulic loss coefficients (such as manhole and junction losses, etc.) have been incorporated into the HGL calculations. Provide specific discussion in the report addressing the analysis of these, and any other pertinent input parameters (DS 10-02.0, Sec. 2.3.1.5 C & E). 3. Describe and present hydraulic calculation sheets for each of the hydraulic systems used to collect offsite flows (OS 3 A, B, & C) such as collector channels and flow-through (wall) openings; and to return flow(s) to natural or existing locations (CP 1B, 2, 3, 4 & 6) and magnitudes along or adjacent to downstream property line(s) at all discharge locations (DS 10-02, Sec. 2.3.1.5 B & F & DS 10-01.0, Sec. 3.3.3). 4. Provide details in the report (Figure 4) showing dimensions of the proposed detention/retention basin and associated structures, including: a) the location, size and type of inflow and outflow structures, with dimensions and elevations of critical portions of each provided; b) a minimum 15' wide vehicular maintenance access ramp (15 % maximum slope; c) 100-year ponding limits; (e) locations and types of security barrier(s) to be installed; and (f) erosion protection (riprap) sizing and dimensions (DS 10-02, Sec. 2.3.1.6 A 4 and DS 10-01.5.2.6). 5. Discussion of forthcoming revisions to Concentration Point OS 3A may not be approvable. Specifically, the discussion of this watercourse not entering the project area (2nd paragraph, page 4) under developed conditions does not appear consistent with existing drainage conditions. Existing drainage patterns should be maintained as closely as possible under developed conditions. 6. Provide a very detailed Drainage Structures and Detention/Retention Basin Maintenance Checklist and Schedule in the report. Include a statement or discussion that certification of such maintenance shall be undertaken by an Arizona registered Professional Civil Engineer. Identify each of the structures to be maintained/inspected, identifying the minimum frequency of inspection and expected range of acceptable performance (i.e. sedimentation levels, scour hole dimensions, etc.). 7. As part of the checklist, state that the annual inspection report shall contain the following summaries: (provide language verbatim, as written in DS 10-02 Sec. 2.3.1.6 C 2 a & b). 8. A soils report is required to be submitted in conjunction with the design of each surface storage facility which utilizes infiltration as a method of basin drainage. The report shall contain at a minimum, technical information on soil classification, erodibility, permeability, slope stability, groundwater elevation, infiltration rates, recommended minimum building setbacks (from basins and drainageways), whether or not hydro-collapsing soils are present, and contain the results of a minimum 30 foot deep soil boring (Pima County/City of Tucson Stormwater Detention/Retention Manual - DS 10-01 - Sec. 3.5.1.5 & DS 10-02.0, Sec. 14.2.6). 9. Address trash rack requirements for the proposed orifice outlet (DS 10-01.0, Sec. 3.3.3) 10. Address/discuss detention/retention basin embankment, emergency spillway, and seepage requirements in the report (DS 10-01 Section 3.3.4). 11. It appears additional scuppers will be necessary at those locations where flows are being directed toward onsite pedestrian circulation areas (Figure 4 and the Site/Grading plan). Depict and label the additional scuppers, with appropriate labeling and notations (DS 2-08.5.1 E & DS 3-01.4.4 F). 12. Please refer to Sections 3.5.1.1 - 3.5.1.4 of the Stormwater Detention/Retention Manual (DS 10-01.0) for additional retention/detention design guidelines, maximum disposal times, etc. 13. Describe and demonstrate how site grading will comply with Chapters 1 and 4 of the Pima County/City of Tucson Stormwater Detention/Retention Manual, with particular attention/discussion given to how the basins will serve as: project amenities; multi-use facilities; will be visually appealing; whether they will serve as human activity zones (8:1 slope maximums in such areas); and whether intended as passive and/or active recreation areas (DS 10-01.0). 14. Please refer to Section 4.3 of the Stormwater Detention/Retention Manual for additional retention/detention technical design guidelines and requirements, and provide discussion and designs for conformance with these guidelines (DS 10-01.0). GRADING AND SITE PLAN: Please note that revisions to the drainage report may result in necessary revisions or additions to the site/grading plan. 1. Label all buildings with individual designations for ease of review. 2. Depict offsite drainage acceptance points, with contributing drainage areas, flow arrows, and 100-year peak discharges for each significant watercourse (1 acre or greater in size) entering or leaving the site (DS 10-02.0, Sec.2.3.1.4 C 2 & 4). 3. Provide details for acceptance/conveyance mechanisms for offsite flows entering from the west. (DS 2-02.2.1.27). 4. It appears numerous additional scuppers will be necessary at those locations where flows are being directed toward onsite pedestrian circulation areas. Depict and label the additional scuppers, with appropriate labeling and notations - see comment # 11, above (DS 2-08.5.1 E & DS 3-01.4.4 F). 5. Include detailed discussion and engineering justification in the response letter for the proposed fills in the vicinity of the four southeastern buildings. 6. Include specific geotechnical engineering evaluation of this grading plan, with recommendations for the proposed significant fills above existing grade associated with these four structures. 7. Provide additional cross-sections for all maximum fill locations. 8. Please provide reference to the appropriate plan sheets for the proposed onsite storm drains. 9. Provide a note on the plan stating that, (a) the owner or owners shall be solely responsible for operation, maintenance, and liability for drainage structures and the retention/detention basin; (b) that the owner or owners shall have an Arizona Registered Professional Civil Engineer prepare a certified inspection report for the drainage and detention/retention facilities at lease once each year, and that these regular inspection reports will be on file with the owner for review by City staff, upon written request; (c) that City staff may periodically inspect the drainage and retention/detention facilities to verify that scheduled and unscheduled maintenance activities are being performed adequately; and (d) that the owner or owners agree to reimburse the City for any and all costs associated with the maintaining of the drainage and detention/retention facilities, should the City find the owner or owners deficient in their obligation to adequately operate and maintain their facilities" (DS 10-02.0, Section 14.3.2). 10. Depict, label and fully dimension basin maintenance access ramps on the site and grading plan 11. Depict and label grading limits. 12. Explain why horizontal do not include elevations, and provide a local benchmark. 13. Label all site/grading plan sheets as such on each sheet (including detail sheets), as necessary. STORMWATER POLLUTION PREVENTION PLAN (SWPPP): Please submit three copies of SWPPP text with specific description and discussion addressing all required items for stormwater pollution prevention, as outlined in the construction SWPPP Checklist, available at the following link: http://www.adeq.state.az.us/environ/water/permits/download/cswppp.pdf. Listed below are some items that must be included with a resubmittal. For additional information regarding SWPPP content specifications, go to: http://www.azdeq.gov/function/forms/appswater.html Please visit the links provided for complete SWPPP preparation/requirements. Listed below are some items that must be provided, at a minimum: 1. Depict and label an appropriate washout location. 2. Depict and label a sediment trap or basin. 3. Depict and label an appropriate protected material storage area. Resubmittal will require a revised Drainage Report, Site, Grading and Stormwater Pollution Prevention Plans addressing all items listed above. If you have any questions, I can be reached at 791-5550, extension 1189 or Dwillia1@ci.tucson.az.us Douglas Williams Sr. Engineering Associate Engineering Division Development Services Department |
Final Status
| Task End Date | Reviewer's Name | Type of Review | Description |
|---|---|---|---|
| 05/19/2005 | KMEDINA1 | OUT TO CUSTOMER | Completed |