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Permit Review Detail

Permit Number: T03BU00106
Parcel: Unknown

Review Status: Completed

Review Details: RESUBMITTAL

Permit Number - T03BU00106
Review Name: RESUBMITTAL
Review Status: Completed
Review Date Reviewer's Name Type of Review Description Status Comments
08/25/2003 Doug Williams ENGINEERING REVIEW Denied SUBJECT: Grading Plan Review
REVIEWER: Doug Williams
DATE: 25 August 2003
ACTIVITY NUMBER: T03BU00106
T15S, R13E, Section 1

SUMMARY: Engineering Division has reviewed the grading plan received on 13 August 2003. Approval of the grading plan is not recommended at this time. The following comments are offered:


GRADING PLAN COMMENTS:

1. Recent changes in federal and state requirements for stormwater pollution controls require all developments with construction activities disturbing one (1) acre or greater to be covered by a stormwater quality permit, effective March 2003. Arizona Pollutant Discharge Elimination System (AZPDES) requirements must be met for this site development. Grading plan/permit submittal requirements include three (3) sets of Grading and Stormwater Pollution Prevention Plans (SWPPP's), 3 copies of the signed notice(s) of intent (NOI's) sent to Arizona Department of Environmental Quality (ADEQ), et. al. (see enclosure and NPDES conditional approval comment folder from the January 23, 2003 review comments). Please refer to the AZPDES comments below for the major items that must be included for this submittal. For further information, please visit www.adeq.state.az.us/environ/water/permits/stormwater.html;
2. The slope percentages provided do not match the approved paving plans for this project. Please revise all street grades to match the approved Paving Plans;
3. Please revise/correct cross sections D/1 and B/2 sidewalk areas to match the approved Paving Plans;
4. Check and revise as necessary all line table data and plan labeling for the individual water harvesting basins. Random checks indicate apparent mislabeling and omissions of various legs and/or their corresponding entries/dimensions. Construction dimensions of the basins must be clearly labeled and dimensioned for clarity during construction;
5. Please revise the plotting of the individual basins so they are contained entirely within their corresponding lots on the plan sheet (see redlines on sheet 3 of 4);
6. Please provide line table data for lines 12-19 and 99-102, and clarify locations of lines 104-112;
7. Demonstrate conformance to minimum setback recommendations in section 6.5 of the geotechnical report prepared for this project;
8. Complete and submit a floodplain use permit application with the grading plan/permit application resubmittal. A $50.00 Floodplain Use Permit application fee will be required prior to submittal, in accordance with Tucson Code, Section 26-11.2 i;
9. The basin area data table appears to indicate typical top areas that are greater than bottom areas - please clarify;
10. The resubmittal must contain a copy of the stamped/approved Tentative Plat.

AZPDES COMMENTS:

The following list identifies the major criteria required on a SWPPP plan. All comments may not be applicable to this project, and many may already be provided. Please ensure the items not provided are included with a resubmittal.

Submit Three Packets, each containing:

1. Signed copy of Notice of Intent (NOI); (Part III.F) Each operator is responsible for submitting the original of the NOI to ADEQ;
2. Stormwater Pollution Prevention Plan (SWPPP), including a Narrative and Plan Sheets;
3. Signed project manager/owner certification and contractor's certification (if available) (Part IV.J.1);

Please note that upon approval, two packets will be returned to the applican. One must be retained on the job site, the second for recordkeeping purposes. The third remains with the City for review and inspection purposes.
Please ensure the Civil Engineer's Arizona registration seal and signature appears on all plan sheets.

The Plan Cover sheet should contain:

1. Project title block with name and address of project;
2. North arrow, scale;
3. Index of plan sheets (if more than one plan sheet);
4. Legend including symbols for designated washout areas, solid waste disposal areas, equipment storage and maintenance areas, & protected chemical storage areas;
5. Owner's/Developer's and Engineer's name, address, phone number and email address, if any;

SWPPP REQUIREMENTS:

General Project Information:

1. Provide identification of all operators and the areas over which each has control (Part IV.C.1). Where an operator is unknown (such as a yet to be determined general contractor) leave space for the identity to be supplied later;
2. Provide a description of the project and it's intended use (Part IV.C.2.a);
3. Describe the intended sequence of soil disturbing activities (Part IV.C.2.b);
4. Provide the total area of site, and an estimate of the total area to be disturbed (include any off-site borrow and/or fill areas) (Part IV.C.2.c);
5. Provide estimated run-off coefficients for pre-construction and post-construction conditions (Part IV.C.2.d);
6. Provide existing data on soils and quality of site discharges (Part IV.C.2.d);
7. Provide general location map showing and identifying receiving waters within 1 mile (Part IV.C.2.e);
8. Include a copy of the AzPDES permit and the NOI on forms provided by ADEQ (Part IV.F). Each operator is responsible for submitting a completed NOI to ADEQ and to the City of Tucson;

Assessment of Potential Impacts:

1. Identify the name of nearest receiving waters and the a real extent and description of any wetlands that will be disturbed or receive discharges from disturbed areas of the project (Part IV.C.4);
2. Identify location and potential discharges from support activities, including asphalt/concrete plants and stockpiles (Part IV.C.5);
3. Describe construction and waste materials expected to be stored on-site with updates as appropriate. Include descriptions of controls to reduce pollutants from these materials (Part IV.D.8.c);
4. Identify off-site material storage areas used solely by the project (Part IV.C.6);
5. List sources of non-stormwater discharges including water from dust control, vehicle washing, and concrete washout (Part IV.D.7);

BMP Selection:

1. Describe BMPs for each major activity in the project description; for on and off-site construction, waste and material storage areas or support activities (Part IV.d.1);
2. Describe spill prevention and control plan (Part IV.D.8.c);
3. Describe BMPs for non-storm discharges (Part IV.D.7);
4. Describe vehicle and equipment maintenance controls (Part IV.c.5);
5. Describe controls to comply with applicable federal, state or local requirements (Part IV.G);
6. For control measures, identify the implementation sequence and the operator responsible, (Part IV.D.1) and why BMPs were selected (Part IV.D.2.b);
7. All BMPs must be properly selected, installed and maintained per specifications and good engineering practices (Part IV.D.2.b);
8. If a BMP has been used inappropriately, it must be must replaced or modified within 24 hours (Part IV.D.2.b);
9. Erosion and sediment controls shall be designed to retain sediment on site (Part IV.D.2.a). If sediment does leave the site, off-site accumulation of sediment must be routinely removed to ensure no adverse effects on water quality (Part IV.D.2.c);
10. Describe good housekeeping practices to prevent litter, construction debris, and construction chemicals from leaving the site (Part IV.D.3);
11. Include a statement that the project is in compliance with all applicable federal State, or local requirements (Part IV.G);

Erosion Controls:

1. Document areas where existing vegetation will be preserved (Part IV.D.4.a);
2. In areas where construction has temporarily or permanently ceased, stabilization measures must be implemented within 14 days (Part IV.D.4.b). If construction will resume within 14 days, then no stabilization measures are needed (Part IV.D.4.b.i);
3. Describe interim, temporary and permanent stabilization practices, including an implementation schedule (Part IV.D.4.a);
4. If stabilization includes establishing perennial vegetation, and drought conditions or seasonally arid conditions preclude vegetation establishment, vegetative stabilization must be initiated as soon as practicable (Part IV.D.4.b.iii);

Records of stabilization maintenance to be retained:

1. Dates when major grading activities occur (Part IV.D.4.c.i);
2. Dates when construction temporarily or permanently ceases on a portion of the site (Part IV.D.4.c.ii);
3. Dates when stabilization measures are initiated and completed (Part IV.D.4.c.iii);


Sediment Controls:

1. Describe structural practices to divert flows or limit runoff (Part IV.D.5);
2. Consider public safety as a design factor (Part IV.D.5.a.i);
3. Avoid placement of structural controls in floodplains (Part IV.D.5);
4. For drainage areas of 10 or more acres, provide temporary or permanent sediment basin with storage for calculated volume of runoff from a 2 year, 24 hour storm (Part IV.D.5.a.i);
5. In determining drainage area, do not consider runoff from undisturbed or stabilized areas and off-site flows that are diverted around the disturbed area and the sediment basin. (Part IV.D.5.a.i);
6. Where runoff volume is not calculated, provide temporary or permanent sediment basin with a storage volume of 3,600 cubic feet of runoff per acre (Part IV.D.5.a.i);
7. If a sediment basin with these volumes is not achievable, then smaller sediment basins and or sediment traps shall be used (Part IV.D.5.a.ii);
8. For drainage areas less than 10 acres, smaller sediment basins and/or sediment traps shall be used (Part IV.D.5.a.iii);
9. When determining if a sediment basin is attainable, factors to consider include, site soils, slope, available area. If non-attainability is claimed, include an explanation (Part IV.D.5.a.i);
10. Remove sediment from sediment controls when design capacity has been reduced by 50% (Part IV.E.3);
11. Silt fences, vegetative buffer strips, or other sediment controls are required for all down slope boundaries (and for side slope boundaries as appropriate) (Part IV.D.5.a);
12. Place velocity dissipation devices at discharge locations and along the length of any outfall channel to provide a non-erosive flow velocity (Part IV.D.5.b);
13. Describe how soil will be stabilized at culvert locations to prevent rills and gullies (Part IV.D.8.e);

On Plan Sheets or Site Map show:

1. Drainage patterns (Part IV.C.3.a);
2. Approximate slopes after major grading (Part IV.C.3.a);
3. Areas of soil disturbance/Areas which will not be disturbed (Part IV.C.3.b);
4. Locations of structural and nonstructural controls (Part IV.C.3.c);
5. Locations where stabilization practices are planned (Part IV.C.3.d);
6. Locations of off-site and on-site material, waste, borrow areas, and equipment storage areas (Part IV.C.3.e);
7. Locations of surface water bodies (including wetlands) (Part IV.C.3.f);
8. Locations where stormwater discharges to a surface water (include ephemeral waters, or dry washes) and to MS4s (Part IV.C.3.g);
9. Locations and registrations numbers of on-site drywells (Part IV.C.3.h);

Post Construction Stormwater Controls:

1. Describe Post Construction Stormwater Controls that will be installed during construction;
2. Design and install Post Construction Controls consistent with applicable local or state requirements;
3. Describe measures to prevent the discharge of solid materials to waters of the US (Part IV.D.3);
4. Place structural measures on upland soils to the degree attainable;

Other Controls:

1. Describe BMPs to minimize off-site vehicle tracking of sediments and the generation of dust (Part IV.D.8.b);
2. Report oil or hazardous materials releases in excess of reportable quantities, or that may endanger human health or the environment, within 24 hours to ADEQ: (602) 771-4466 FAX (602) 771-4505 (Part VI.L.5.a);

Inspection Requirements:

1. Specify the inspection schedule either: once per week, OR once per 14 days and within 24 hours of a 0.5" rainfall (Part IV.H.1);
2. Inspection can be reduced to monthly if, site has been temporarily stabilized, OR Construction is in an arid area, AND construction is occurring during the seasonal arid period. Monthly schedule must also include pre and post storm inspections (Part IV.H.2);

During Inspection:

1. Verify SWPPP measures are implemented and effective;
2. Note any BMP deficiencies and include corrective action schedule;
3. Note any maintenance needs or modifications ;
4. Certify that facility is in compliance with the SWPPP.

If you have any questions, I can be reached at 791-5550, ext. 1189 or Dwillia1@ci.tucson.az.us

Douglas Williams
Engineering Division
Senior Engineering Associate
Development Services Department
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