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Permit Review Detail

Permit Number: T03BU01937
Parcel: Unknown

Review Status: Completed

Review Details: GRADING

Permit Number - T03BU01937
Review Name: GRADING
Review Status: Completed
Review Date Reviewer's Name Type of Review Description Status Comments
08/22/2003 JOE LINVILLE NPPO REVIEW Denied 1) Submit a copy of the stamped, approved tentative plat, landscape/NPPO Plans for comparison. Grading plans will be reviewed for consistency with the approved plans.

2) Revise the grading plan to eliminate any disturbance within the 30' scenic route buffer area along Mission Road. Revise the grading limits and identify areas to remain natural
as indicated in the tentative plat and native plant preservation plan.

3) A pre-permit inspection will be required before the grading permit will be issued. Call 791-5640 Ext 1140 to schedule.
08/25/2003 Patricia Gehlen ZONING REVIEW Denied Zoning
08/25/2003
Prior to review and approval a copy of the approved tentative plat must be included in the submitttal package.
08/26/2003 Elizabeth Eberbach ENGINEERING REVIEW Denied SUBJECT: Star Pass Heights (S02-046) Grading Plan Engineering Review
REVIEWER: Elizabeth Eberbach
ACTIVITY NUMBER: T03BU01937

SUMMARY: The "PRELIMINARY - NOT FOR CONSTRUCTION OR RECORDING" Grading Plan sheets, copy of Tentative Plat, SWPPP sheets, the Geotechnical Report, and Drainage Report were received. Engineering has reviewed the received items and does not recommend approval of the Grading Plan at this time. The Drainage and Geotechnical Reports were reviewed for Grading Plan purposes only. Address the following grading plan comments per IBC Chapter 36 Section 9.

DRAINAGE REPORT COMMENTS:
1) City of Tucson Development Standards (DS) Section No.10-02.14.3.4: The maximum of slope on maintenance access areas is 15%. Show maintenance access ramps and label slope grades on plan views of Grading Plan.
2) DS Sec.10-01.3.3.4: It appears from sheet 2 details that the basins are bermed. Provide calculations for the unattenuated flow and emergency spillway design. Label any erosion protection on plan view of Grading Plan.
3) DS Sec.10-01.5.1.6: Since southeast basin has low infiltration rate (percolation test #3) remove or update statement on page 12 regarding retention supplied in all basins. Also, clarify that retention requirements are met without this basin, and clarify retention volume for DET3 on Tables 9 & 12.
4) DS Sec.10-02.8.5.1.4: Some freeboard calculations do not match proposed labeled channel depths dimensions on Grading Plan. Update FREEBOARD Table in Hydraulic section of Drainage report to reflect revisions for grading plan. Revise details to match the correct freeboard calculations in drainage report. Specifically, provide calculation table for minimum depth of channels for:
(i) CH1(inlet) 10.85 fps, d=.60'
(ii) CH1 (also near STA 10+80)
(iii) CH1(7%) 22.16 fps, d=.91'
(iv) CH1(other percentages)
(v) CH5(inlet) 10.35 fps, d=.58'
(vi) CH5 30.04 fps, d=.37'
5) DS Sec.2-03.2.4.L.4: Explain and provide calculations to show how proposed drainage entrances are sized to capture flows exiting the existing CMP's just north of proposed lots 35 and 53 near Starr Pass Boulevard.
6) Provide calculations for pad elevations that reflect a design that prevents flows from streets entering lots 56, 62, 63, 68, 69, and 74.
7) DS Sec.2-03.5.2: For the concrete section of the catch basin entrance for detail D on sheet 8, provide headwater analysis to show that the catch basin can convey the 52cfs entering the basin at 35% slope with a velocity of 30fps as stated in the drainage report. Also provide headwater analysis for the catch basin entrance on sheet 7.

GRADING PLAN COMMENTS:
8) On sheet 1, address the following:
a) IBC Chap 36 Sec 11: A grading bond shall be posted for native seeding. The amount of this bond will be determined upon submittal of square footage of disturbance. If grading construction does not commence within 60 days after grubbing, the disturbed area shall be native seeded within 30 days following the expiration of the 60 day period.
b) Provide notation for total square footage of disturbance.
c) Add reference to IBC Chapter 36 to GENERAL AND GRADING NOTE 8.
d) Add note to Grading Plan regarding typical slope treatments per page 11 and 12 of geotechnical report.
e) Clarify the grading limits delineation on Legend which does not match the linetype shown on plan view.
f) To differentiate proposed concrete erosion protection in Zeller Wash, add proposed as well as existing concrete hatching to Legend.
g) Tie project to basis of bearing and shown section bearings to a property line of the project on a plan view.
h) On legend, add the following:
i) symbol for existing down guys and utility poles.
ii) existing utility lines such as sewer with pipe size.
iii) clarify horizontal to vertical proportions for slopes (H:V).
iv) provide linetype differentiation between property line and proposed contour line.
v) clarify linetype for retaining walls between some lots. Add delineation to legend on sheet 1 or add keynotes or other notation for clarification of retaining wall locations on plan view.
9) On sheet 2, address the following:
a) DS Sec.10-01.3.3.4: Show existing grade elevation on sections G & H. Label erosion protection for emergency spillway design for all berms (where fill is provided) for basins.
b) Some channel section names are missing from section titles; label each channel by number per Drainage Report.
c) For detail E, address the following:
i) The depths for the three channels are not legible beneath the hatching; clarify depths.
ii) Provide maximum slope grade (instead of "varies") and slope treatment for side slopes for channels.
iii) Provide thickness and D50 for grouted rip rap.
d) For sections C, D, E, & F, check channel depths per updated freeboard calculations. For example, depths for channel 2 & 3 do not match the depth of 1.3' per the drainage report.
e) For interlot grading detail, also provide a typical section for retaining wall showing property line delineations such that all wall and footer placement lies wholly within one lot.
f) Provide a detail or revise details to label the minimum distance between top of proposed slopes or retaining wall and the edge of a proposed driveway.
g) Label wall opening typical spacing and sizing for any future walls.
h) Clarify pad elevation in relation to high point on typical lot details "A" & "B".
i) Provide names of streets associated with proposed street cross sections A & B.
10) On sheet 3, address the following:
a) Identify existing slabs and other existing structures or conditions. On plan view, label description of removal or relocation. Also, delineate existing limits of the potential open pit mine or former quarry located north of Zeller Wash. Add notation regarding geotechnical recommendations for preparation of the area to be graded at and near this existing condition. No grading permit will be issued until this solution is established.
b) Provide general lot dimensions and bearings.
c) Provide general dimension widths and lengths for all basins and common areas.
d) Provide bearings for centerlines.
e) There appears to be a revolving reference for the scupper callouts. Check scupper keynote references to Scupper ID Tables.
f) For southeast basin, address the following:
i) Clarify discrepancy between the ponding elevation, top of berm, and contour elevations at east side of basin.
ii) Label southeast basin as "Detention Basin" since infiltration rate is so low and basin only detains flows per drainage report.
g) Label basin with basin number.
h) Label maximum slope grade for each basin with any associated slope treatment.
i) Identify locations for grading construction access to site.
j) Label proposed sewer easement.
11) On sheet 4, address the following:
a) Check position of existing culvert on plan view; the existing contour lines do not appear to match elevations near entrance and exit of culvert.
b) Provide section for north slope at north of sidewalk on Woodsville Drive. Show max slope grade in this region and proposed slope treatment.
c) Provide section for north slope at north side of lot 21 between pad grade and Woodsville Drive. Show max slope grade / retaining wall in this region and proposed slope treatment that meets recommendations of geotechnical report.
d) Clarify 60' dimensioning for the offset, parallel lines north of lot 21.
12) On sheet 5, address the following:
a) Show and label location of benchmark on plan view.
b) Adjust grading for proposed cut slope north of lot 5 to remove grading limits from existing pipeline easement.
c) Identify line running between existing 60' pipeline easement.
d) For cross section detail B, address the following:
i) Show that footer is placed on one side of property line.
ii) Add that retaining wall will be by separate building permit.
e) Provide names of streets associated with proposed street cross section "A".
f) Provide section for north slope of lot 5. Show maximum slope grades in this region, proposed erosion protection.
g) Label slope treatment for proposed slope to the north of lots 10 & 5.
h) Provide section for west slope of lots 9 & 10. Show maximum slope grades in this region, proposed erosion protection.
i) Show how flows will be prevented from entering and eroding lots 6, 7, & 8. Label any erosion protection.
j) Label Common Area D as Natural Open Space and as a "No Disturb Area".
13) On sheet 6, address the following:
a) Label all existing and proposed contour lines.
b) For details A & D, address the following:
i) For channels 2 & 3, revise proposed contours to show how flows will be contained in spillways.
ii) Provide dimensions for spillways on plan view.
c) For channel 4, dimension edge of concrete spillway at end of rip rap channel on detail B.
d) For details A & C, provide D50.
e) A proposed slope of 6:1 is labeled on detail E. Clarify minimum slope grade for maintenance access areas as 15%.
14) On sheet 7, address the following:
a) Check channel slope grades that are shown on plan views on other sheets and sections on this sheet so that the slopes match in plan and section views on all sheets as well as drainage report. See sheet 3.
b) Show where grade break is located in profile view for slope grade change from 4.7% to 3.7%.
c) Label dimensions, D50, and thickness for the proposed drainage entrance that capture flow exiting the existing CMP's just north of proposed lots 35 and 53.
d) On plan view, label material, dimensions, D50, and thickness for the proposed drainage entrance that captures flow exiting the existing culvert just north of proposed lot 53.
e) Label all existing, proposed contour lines, and label channel number on detail and section.
15) On sheet 8, address the following:
a) For detail B, label dimensions and check thickness for the proposed drainage entrance that captures flow exiting the existing culvert just north of proposed lot 35.
b) Label all existing and proposed contour lines.

GEOTECHNICAL REPORT COMMENTS:
16) The geotechnical report was submitted with this first submittal of the grading plan. The addendum attached to the report states that a former quarry or open pit mine may be located in the proposed development, centered 250 feet east of the western property line and north of Zeller Wash. Results from a geotechnical evaluation of this area must be submitted addressing all grading recommendations for this development. Further grading comments may be forthcoming upon resubmittal of geotechnical evaluation.
17) The geotechnical report shall specifically address all criteria listed in DS Sec.10-02.14.2.6. The soils report shall contain: a) technical information regarding soil classification, soil erodibility, soil permeability and infiltration rate, slope stability and ground water elevation; b) a recommended minimum setback from buildings and other structures; c) an evaluation of whether or not hydro-collapsing soils are present onsite; and d) the results of a minimum 30' soil boring. In conjunction with the soils report, either the soils engineer or the civil engineer of record for the development shall provide written certification to the City Floodplain (Engineering) Section, prior to issuance of a building permit, that the proposed buildings or structures are in compliance with the recommended minimum building setback from the retention/detention basin, as stipulated by the soils report.
18) As an RCP development, it appears that the geotechnical engineer will need to assess the small lot configuration for more specific grading recommendations for drainage. Otherwise, show how drainage from proposed homes will drain away from structures at a minimum of 15 feet as recommended in the geotechnical report on page 10. Specifically, show minimum setback distances on typical lot grading details that match the geotechnical recommendations.
19) For final Grading Plan resubmittal, provide the Phase 1 Environmental Site Assessment report and an addendum stating that the geotechnical engineer has reviewed the revised grading plans.

SWPPP COMMENTS:
20) Address the following for the SWPPP:
a) Identify all operators for the project site, and the areas over which each operator has control; (Part IV.C.1)
b) Indicate in the SWPPP the name(s) of the party(ies) with operational control over project specifications (including the ability to make modifications in specifications). (Part IV.B.2.c)
c) 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)
d) Indicate in the SWPPP the areas of the project where each operator has operational control over day-to-day activities. (Part IV.B.2.c)
e) Describe the project and its intended use after the NOT is filed (e.g. low density residential, shopping mall, highway, etc.) (Part IV.C.2.a)
f) Provide an estimate of the runoff coefficient of the site for both the pre-construction and post-construction conditions. (Part IV.C.2.d)
g) Show on the location map the receiving waters within one mile of the construction site. (Part IV.C.2.e)
h) Show, on the site map, areas of soil disturbance and areas that will not be disturbed. (Part IV.C.3.b)
i) The text of the SWPPP calls for silt fence to be installed at the grading limits. Show the described silt fence on the site map, (Part IV.C.3.c)
j) Show, on the site map, locations where stabilization practices are expected to occur. (Part IV.C.3.d)
k) Show, on the site map, locations where stormwater discharges to a surface water (including ephemeral waters or dry washes) and to MS4s. (Part IV.C.3.g)
l) The text of the SWPPP indicates that it is not expected that any potential pollutants will be stored on the site. Clarify whether form oil, construction materials, construction waste or any other potential pollutant will likely be stored on site. Identify the location and describe any stormwater or non-stormwater discharges at the site associated with other pollutant sources such as fueling operations, materials stored on-site, waste piles, etc. (Part IV.C.5)
m) The Site Map indicates that silt fence will be installed around the temporary sediment basins. Revise the proposed sequence of activities to clarify when the proposed silt fence will be installed. (Part IV.D.1)
n) Specify that erosion and sediment controls shall be designed to retain sediment on site to the extent practicable. (Part IV.D.2.a)
o) Specify that all 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)
p) 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)
q) Describe and identify interim and permanent stabilization practices for the site, including a schedule of when the practices will be implemented. (Part IV.D.4.a)
r) Document where any existing vegetation is to be preserved. (Part IV.D.4.a)
s) Specify that the operator must initiate stabilization measures within 14 days in portions of the site where construction activities have temporarily or permanently ceased. (Part IV.D.4.b)
t) The operator must maintain the following records as part of the SWPPP. Provide pages to record the required information. (Part IV.D.4.c)
i) Dates when major grading activities occur. (Part IV.D.4.c.i)
ii) Dates when construction activities temporarily or permanently cease on a portion of the site. (Part IV.D.4.c.ii)
iii) Dates when stabilization measures are initiated and completed and reasons for delay, if applicable, under IV.D.4.b. (Part IV.D.4.c.iii)
u) Describe structural practices to divert flows from exposed soils, store flows or otherwise limit runoff and the discharge of pollutants from exposed areas of the site to the degree attainable. Placement of structural practices in floodplains shall be avoided to the degree attainable. A combination of sediment and erosion control measures is required to achieve maximum pollutant removal.
v) Place velocity dissipation devices at discharge locations and along the length of any outfall channel to provide a non-erosive flow velocity from the structure to a water course so that the natural physical and biological characteristics and functions are maintained and protected (e.g. no significant changes in the hydrological regime of the receiving water). (Part IV.D.5.b)
w) Describe post-construction storm water management measures that will be installed during the construction process to control pollutants in stormwater discharges after construction operations have been completed. Structural measures shall be placed on upland soils to the degree attainable. Such measures must be designed and installed consistent with applicable local or state
x) stormwater management requirements. (Part IV.D.6)
y) Identify all allowable sources of non-stormwater discharges except for flows from fire fighting activities. Non-storm water discharges are to be eliminated or reduced to the extent feasible. (Part IV.D.7)
Allowable sources of non-stormwater discharges are: (Part I.C.2)
iv) Discharges from fire-fighting activities;
v) Fire hydrant flushing;
vi) Waters used to wash vehicles where detergents are not used;
vii) Water used to control dust, provided effluent or other wastewaters are not used;
viii) Potable water sources including water line flushing;
ix) Routine external building wash down where detergents are not used;
x) Pavement wash waters where spills or leaks of toxic or hazardous materials have not occurred (unless all spilled material has been removed) and where detergents are not used;
xi) Uncontaminated air conditioning or compressor condensate;
xii) Uncontaminated ground water or spring water;
xiii) Foundation or footing drains where flows are not contaminated with process materials such as solvents;
xiv) Potable water well flushing where the receiving waters are ephemeral,
xv) Water used for compacting soil, provided effluent or other wastewaters are not used;
xvi) Water used for drilling and coring such as for evaluation of foundation materials, where flows are not contaminated with additives; and
xvii) Water obtained from dewatering operations/foundations in preparation for and during excavation and construction;
z) Describe appropriate BMP's to minimize pollutants in any non-stormwater discharges. Superchlorinated wastewaters must be held on-site until the chlorine dissipates, or otherwise dechlorinated prior to discharge, except if used in emergency firefighting (Part IV.D.7)
aa) Describe measures to minimize the generation of dust. (Part IV.D.8.b)
bb) Describe construction and waste materials expected to be stored on-site. Provide a page or pages to record updates as appropriate. Describe controls to reduce pollutants from these materials including storage practices to minimize exposure of the materials to stormwater, and spill prevention and response practices. (Part IV.D.8.c)
cc) Describe measures to sufficiently stabilize soil at culvert locations to prevent the formation of rills and gullies during construction. (Part IV.D.8.e)
dd) Include a copy of the general permit and the NOI that was or will be submitted to ADEQ. If other agreements with any state, local, or federal agencies exist that would affect the provisions or implementation of the SWPPP, include copies of those agreements. (Part IV.F)
ee) The grading plan and landscape plan may be incorporated into the SWPPP by reference. The requirements of the plans must be treated by the operator as part of the SWPPP. (Part IV.G)

SWPPP Inspections:
ff) Specify an inspection schedule in the SWPPP. (Part IV.H.1) Ensure that all of maintenance and inspection notes are consistent with the specified schedule. Choose either of the following:
xviii) The site will be inspected at least once every 7 calendar days, or
xix) The site will be inspected at least once every 14 calendar days, and also within 24 hours of the end of each storm event of 0.5 inches or greater.
gg) Provide example forms for Compliance Evaluation Reports (Inspection Reports). At a minimum the forms must include:
hh) The inspection date. (Part IV.H.5.a)
ii) Name(s) and title(s) and qualifications of person(s) making the inspection. Qualifications must either be on/attached to the report or alternatively, if the SWPPP documents the qualifications of the inspectors by name, that portion of the SWPPP may be referenced. (Part IV.H.5.b)
jj) Weather information for the period since the last inspection (or since commencement of construction activity if the first inspection), including best estimate of the beginning of each storm event, duration of each event, time elapsed since last storm event, and approximate amount of rainfall for each event (in inches). (Part IV.H.5.c)
kk) Location(s) of discharges of sediment or other pollutants from the site. (Part IV.H.5.d)
ll) Location(s) and identification of BMP's that need to be maintained; failed to operate as designed or prove inadequate. (Part IV.H.5.e)
mm) Location(s) where additional BMP's that do not exist at the time of inspection are needed. ((Part IV.H.5.f)
nn) Corrective actions required, including any changes to SWPPP necessary and implementation dates. (Part IV.H.5.g)
oo) Identification of all sources of non-storm water and the associated pollution prevention control measures. (Part IV.H.5.h)
pp) Identification of material storage areas and, evidence of or potential for, pollutant discharge from such areas. (Part IV.H.5.i)
qq) Compliance certification statement. (Part IV.H.6)
rr) Signature line with certification statement. (Part IV.H.6)
ss) Include a certification and signature for each operator in accordance with Part VII.K. (Part IV.J.1)

The next submittal should address all the above items. Submit soils report evaluation or any addenda, revised Drainage Report, and revised Grading Plan. If you have questions or want to set up a meeting, call me at 791-5550, extension 2204.

Elizabeth Eberbach, PE
Civil Engineer
Engineering Section
Development Services

Final Status

Task End Date Reviewer's Name Type of Review Description
09/03/2003 DELMA ROBEY OUT TO CUSTOMER Completed