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Permit Review Detail
Review Status: Completed
Review Details: SWPPP
Permit Number - T10BU00084
Review Name: SWPPP
Review Status: Completed
| Review Date | Reviewer's Name | Type of Review | Description | Status | Comments |
|---|---|---|---|---|---|
| 02/03/2010 | ELIZABETH LEIBOLD | ENGINEERING | REVIEW | Denied | DATE: December 9, 2009 ENGINEERS: Wood Patel (Phase 1 Grading), WRG (COSTCO) ACTIVITIES: T10BU00083, T10BU00084 PROJECT: Tucson Marketplace D09-0010 Phase 1 Grading & COSTCO at Bridges Grading Submittal LOCATION: Ward 5 FEMA: 2237K, Zone X-Unshaded WATERSHED: Mission View Wash Watershed adjacent to Greyhound Wash REVIEWER: Elizabeth Leibold, PE SUMMARY: The grading plan submittal was received and reviewed by Planning & Development Services Department Engineering Division. Development Services Department Engineering does not recommend approval of the grading permit application until the following comments are addressed. GRADING PLAN COMMENTS: 1) DS Sec.11-01.4.C: address the following grading comments: a) Provide elevation benchmark and datum information for a local benchmark for the Wood Patel plan set - benchmark should be shown on sheet C2. b) Provide in next submittal, sealed grading plan sheets for Wood/Patel Phase 1 plans. c) On Wood/Patel Phase 1 plan sheet C1, provide in the legend, elevation call out clarifying types of spot elevation call outs (existing, proposed or otherwise labeled). d) On WRG COSTCO plans, sheet C-1.0, provide in the legend, elevation call out clarifying types of spot elevation call outs (existing, proposed or otherwise labeled). e) On WRG COSTCO plans, keynotes are not all used on each sheet and are misleading; consider using only keynotes that are used for each sheet. f) On WRG COSTCO plans, for cross sections on sheet C-1.5, provide slope grades for swales and other slopes. g) On WRG COSTCO plans, explain how loading dock at Fuel station drainage works. h) On WRG COSTCO plans, sheet C-1.5, state whether cover for oil-water separator will be used for keynote 10. i) On WRG COSTCO plans, sheet C-1.9, clarify parking details 10 and 11 for minimum parking stall length and safe maneuverability at curb medians. j) On Wood/Patel Phase 1 plan, detail N on sheet C15 shall specify type of 8-inch stabilization material. 2) Address the following drainage related comments: a) For the Wood Patel plan, provide delineation and dimensions for any recorded offsite grading and drainage improvement construction easements. Sheet C5 indicates offsite grading; provide copy of agreement authorizing offsite work or label dkt/pg of offsite easement. b) On Wood/Patel Phase 1 plans, show floodplain limits on planview with WSEL's adjacent to the project site. c) Show that there is no cut or fill over fiber optic line with section details for conceptual grading information. Or provide authorization to grade from utility prior to permit issuance (add as a note if not submitted with development plan. 3) DS Sec.11-04.C: All easements shall be drawn on the plan. Address the following easement comments: a) On Wood/Patel Phase 1 plans, provide cross sections for the grading areas on sheets C8, C9, C10, C11, and C12 where Fiber Optic and/or Kinder Morgan lines coincide with grading fill or cut construction. b) On WRG COSTCO plans, sheet C-1.3, provide cross sections for the grading areas where Fiber Optic and/or Kinder Morgan lines coincide with grading fill or cut construction. c) On Wood/Patel Phase 1 plans, identify width of easement for optical fiber (AT&T or other utility) along south perimeter. Show how grading construction for Phase 1 will not encroach into easement; whether a grading fence is needed at cut slope at southeast project boundary. d) On Wood/Patel Phase 1 plans, identify and label location and width of Kinder Morgan gas line easement along southeast portion of the project. If project improvements are within utility area, provide documentation from the utility stating authorization to encroach into easement. 4) Tucson Code Chap.26 Art.2: The Stormwater Pollution Prevention Plan (SWPPP) does not meet the minimum requirements of the AzPDES Construction General Permit (CGP). Use the following general comments for SWPPP to revise SWPPP. a) Address the following general SWPPP comments: i) For inspection purposes, please fill out the enclosed City of Tucson's "AZPDES - Posting Requirements" green sheet, and post it or the NOI at construction entrance of the site at beginning of construction activities and maintain this posted document throughout project construction. ii) Label and provide leader line that identifies the receiving waters on a plan view map in report or on exhibit. iii) Show, label, and provide leader line for the receiving waters either on location map on cover sheet, on vicinity map on exhibit, or on other planview. iv) Tucson Code Sec.26 Article 2: Provide registrant seals for SWPP report and exhibit(s) per COT Stormwater Ordinance. v) For resubmittal package, provide 2 copies of revised SWPPP exhibit, report, copy of NOI, and general permit. b) Address the following comments for the SWPPP Report: i) Add Table of Contents and page / section numbering to report. Table of contents show specific page numbers yet numbering is either inconsistent or incorrect. Label each page of the report to match table of content. Tabs may be helpful and are recommended. ii) All Operators shall be identified and have separate certification statements. For the Owner/Operator Certification Statements, provide name and signature for the Operators with each certification statement. iii) The Operator Certification Statement should have a statement with name & signature that they act as Operator and that they have operational control over the construction plans and specifications, including the ability to make modifications to those plans and specifications (e.g., owner, EOR, or developer of project), or that they have day-to-day operational control of those project activities that are necessary to ensure compliance with a stormwater pollution prevention plan for the site or other grading permit conditions. iv) At minimum, one Operator, either the engineer of record or the project manager or owner as listed on the bottom of the second page of the NOI shall sign one of the Operator certifications. Please note that the remaining signatures from the Operators must be on the SWPPP on the site copy of the SWPPP (exhibit or report) at or before commencement of construction. (Part IV.C.1) v) Provide list of contractors and subcontractors to be filled out at commencement of grading construction activity and to be updated on site and kept with the SWPP. Indicate in the SWPPP the name(s) of the party(ies) with day-to-day operational control of those activities necessary to ensure compliance with the SWPPP or other permit conditions. Provide a table for recording the names and responsibilities for each party responsible for activities necessary to ensure compliance with the SWPPP or other permit conditions. (Part IV.B.1.d) vi) Provide sequential list of grading construction activities for this project. The sequence of major activities should state whether establishment of erosion and stormwater controls are to occur prior to clearing and rough grading of this site. vii) Identify and provide a list of potential pollutant sources from this project. viii) Describe good housekeeping procedures to prevent litter, construction debris, and construction chemicals exposed to stormwater from becoming a pollutant source for stormwater discharges. List specific waste disposal methods and practices, such as dumpsters. (Part IV.D.3) ix) Specify that all erosion and sediment control measures must be properly selected, installed, and maintained per the manufacturers' specifications and good engineering practices. If periodic inspections or other information is discovered that indicates a control has been used inappropriately, or installed incorrectly, the Operator must replace or modify the control for site situations as soon as practicable and before the next anticipated storm event. (Part IV.D.2.b) x) Provide copies of compliance evaluation report forms for use by onsite Operators. xi) Provide a copy of the AzPDES general permit (#AZG2008-001) as part of the SWPPP. (Part IV.F) See the weblink: http://www.azdeq.gov/environ/water/permits/download/2008_cgp.pdf xii) Provide copy of completely filled-out NOI that has been sent to ADEQ. See the weblink: http://www.azdeq.gov/environ/water/permits/download/constnoi.pdf xiii) Provide a copy of the form for the NOT. See the weblink: http://www.azdeq.gov/environ/water/permits/download/constnot.pdf c) Address the following comments for the SWPPP exhibit sheets: i) Depict /clarify all specific interim erosion/stormwater control measures and locations of all stabilization practices on planview, including control measures needed along downstream disturbance limits, specific interim erosion control devices at basin outlets, and other controls as necessary for this project. ii) Specific temporary erosion/stormwater control installation details for silt fence, straw bale, check dam, wattle, scupper inlet control, vegetative cover, and/or other controls shall be provided on the SWPP exhibit. iii) Consider placing the particular control measure installation details in a SWPP exhibit. Consider providing a silt fence detail that will be useable to the contractor; provide a detail without drain rock along the base of the silt fence. Any drain rock material that is placed along the base of the silt fence shall not obstruct or divert stormwater flow. If drain rock is not used with silt fence, then earthen material shall only be backfilled against silt fence at grade to allow maintenance of flow pattern. iv) Provide appropriate interim erosion control devices at any basin boundary and exits. Silt fence is not typically accepted at these locations. v) Show limits, dimensions, and designated locations on the planview for both temporary stockpile area, concrete washout area, and material / construction vehicle storage areas, with appropriate controls. vi) Temporary material or vehicle staging / stockpile area, and designated concrete washout locations should not be located in or near basins, washes/river, floodplain, or water harvesting areas. Show on plans where the relocated areas minimize conflict with water harvesting, basins, washes, and/or floodplain areas. vii) Dimension minimum depth and minimum length (50-ft) of stabilized entrance on SWPP exhibit. Label rock size for construction entrances (typically 3-in min, 6-in max). viii) Revise boundary controls according to the following comments: (1) Delineate project boundary limits on plan. (2) Depict and label disturbance / grading limits on SWPPP exhibit. (3) Label 2-ft grading offset from west boundary limits. (4) Assure grading limits on SWPP exhibit match any revised limits of Grading Plan sheets. (5) Revise location of controls at edge of project to be included within the grading/disturbance limits. Assure all construction areas for improvements are included within the disturbance limits and within the control measures. Or revise grading plan disturbance limits. (6) Interim control measures shall be placed within the grading limits that match grading plan. (7) It appears that there area areas that may not need interim sediment/erosion controls along some high points of the grading limits; consider revising locations. (8) To prevent breakout of stormwater runoff along perimeter disturbance limits, revise location of the SWPP BMP controls such that segments of the interim erosion control devices are placed parallel to elevation contours such that runoff will not be channelized along linear protection. ix) Provide the following general notes on the SWPPP cover sheet: (1) Provide a note to the SWPP plan cover sheet and/or front of SWPP report stating that the Operator shall report to ADEQ any noncompliance (including spills) which may endanger human health or the environment. The Operator shall orally notify the office listed below within 24 hours: (a) Arizona Department of Environmental Quality 1110 W. Washington, 5th floor (5515B-1) Phoenix, AZ 85007 Office: 602-771-4466; Fax 602-771-4505 (2) Add note stating a water truck or other temporary water source will be provided for dust control, otherwise explain how wind erosion/dust control will be achieved and provide specific practices. (3) Provide note stating that adjacent street shall be cleaned daily of sediment and other construction debris. Specify that when sediment escapes the construction site, offsite accumulations of sediment must be routinely removed and at a frequency sufficient to ensure no adverse effects on water quality. (Part IV.D.2.a) (Part IV.D.2.c) (4) Add notation regarding restriction of storage or placement of construction material and vehicles within or near basin areas. (5) Add note that on-site adjustments of type of stormwater controls to basin inlet at scupper may be necessary to accommodate for reduction of sediment build-up or prevent ponding. Otherwise, provide additional controls at proposed scupper entrances when paving is in place (ie prior to final grading inspection), or revise plan to show a control measure that can be installed when asphalt is in place. 5) DS Sec.11-01.4.D: Submit final geotechnical report. 6) DS Sec.11-01.2.3: A reseeding bond in the amount of $133,293.60 (for 61.2 acres of disturbance) will be required when picking up the grading permit once approved. PDSD will consider more than one bond for sections of the project (Costco parcel under T10BU000083, corridor area, and remainder of mass graded area) in order to facilitate the final approvals for the Costco grading construction. Resubmittal is required. The next submittal should address all the above items. Submit revised Grading Plans for each grading permit, Geotechnical reports and any addenda, one copy each of the Drainage Reports, other supporting documentation, and a response letter. If you have questions or would like to set up a meeting, call me at 837-4934. Elizabeth Leibold, PE Civil Engineer Engineering Division Planning & Development Services Department |