HomeMy WebLinkAboutDrainage Reports - 02/23/2023City of Fort Collins Approved Plans
Approved by:
Date:
Matt Simpson
02/23/2023
Compliance statement:
"I hereby attest that this report for the [preliminary or final] drainage design for the
4235 S. Mason Street- Mason Center South project was prepared by me or under my
direct supervision, in accordance with the provisions of the Fort Collins Stormwater
Criteria Manual. I understand that the City of Fort Collins does not and will not assume
liability for drainage facilities designed by others."
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Kenneth N. Armfield
Registered Professional Engineer
State of Colorado No. 32527
Armfield Engineering armfieldengineering.com (720) 363 7125
Drainage Report 4235 & 4221 S. Mason Street Blue Ribbon Auto Body Sept 8, 2021 Page 2 of 4
Armfield Engineering, LLC armfieldengineering.com Ph: 720 363 7125
Drainage Report 4235 & 4221 S. Mason Street Blue Ribbon Auto Body Sept 8, 2021 Page 3 of 4
Armfield Engineering, LLC armfieldengineering.com Ph: 720 363 7125
Drainage Report 4235 & 4221 S. Mason Street Blue Ribbon Auto Body Sept 8, 2021 Page 4 of 4
Armfield Engineering, LLC armfieldengineering.com Ph: 720 363 7125
APPENDIX
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Soil Map—Larimer County Area,Colorado 4235 S.Mason
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
4 Altvan-Satanta loams,3 to 9 0.2 9.3%
percent slopes
74 Nunn clay loam, 1 to 3 percent 2.3 90.7%
slopes
Totals for Area of Interest 2.5 100.0%
L]SDA Natural Resources Web Soil Survey 5/20/2020
� Conservation Service National Cooperative Soil Survey Page 3 of 3
Chemical Soil Properties---Larimer County Area,Colorado 4235 S Mason SOIL PH
Chemical Soil Properties
This table shows estimates of some chemical characteristics and features that
affect soil behavior. These estimates are given for the layers of each soil in the
survey area. The estimates are based on field observations and on test data for
these and similar soils.
Depth to the upper and lower boundaries of each layer is indicated.
Cation-exchange capacity is the total amount of extractable cations that can be
held by the soil, expressed in terms of milliequivalents per 100 grams of soil at
neutrality (pH 7.0) or at some other stated pH value. Soils having a low cation-
exchange capacity hold fewer cations and may require more frequent
applications of fertilizer than soils having a high cation-exchange capacity. The
ability to retain cations reduces the hazard of ground-water pollution.
Effective cation-exchange capacity refers to the sum of extractable cations plus
aluminum expressed in terms of milliequivalents per 100 grams of soil. It is
determined for soils that have pH of less than 5.5.
Soil reaction is a measure of acidity or alkalinity. It is important in selecting crops
and other plants, in evaluating soil amendments for fertility and stabilization, and
in determining the risk of corrosion.
Calcium carbonate equivalent is the percent of carbonates, by weight, in the
fraction of the soil less than 2 millimeters in size. The availability of plant nutrients
is influenced by the amount of carbonates in the soil.
Gypsum is expressed as a percent, by weight, of hydrated calcium sulfates in the
fraction of the soil less than 20 millimeters in size. Gypsum is partially soluble in
water. Soils that have a high content of gypsum may collapse if the gypsum is
removed by percolating water.
Salinity is a measure of soluble salts in the soil at saturation. It is expressed as
the electrical conductivity of the saturation extract, in millimhos per centimeter at
25 degrees C. Estimates are based on field and laboratory measurements at
representative sites of nonirrigated soils. The salinity of irrigated soils is affected
by the quality of the irrigation water and by the frequency of water application.
Hence, the salinity of soils in individual fields can differ greatly from the value
given in the table. Salinity affects the suitability of a soil for crop production, the
stability of soil if used as construction material, and the potential of the soil to
corrode metal and concrete.
Sodium adsorption ratio (SAR) is a measure of the amount of sodium (Na)
relative to calcium (Ca) and magnesium (Mg) in the water extract from saturated
soil paste. It is the ratio of the Na concentration divided by the square root of
one-half of the Ca + Mg concentration. Soils that have SAR values of 13 or more
may be characterized by an increased dispersion of organic matter and clay
particles, reduced saturated hydraulic conductivity and aeration, and a general
degradation of soil structure.
u� Natural Resources Web Soil Survey 4/29/2021
� Conservation Service National Cooperative Soil Survey Page 1 of 2
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ImperviousnessEPBC
IMPERVIOUSNESS CALCULATIONS
EXISTING & DEVELOPED AREA
Blue Ribbon Auto Body KNA 7/21/21
Basin B(same for existing&proposed) AREA %OF IMPERV
(SF.) TOTAL AREA %
gravel 0.00 0.0 40
pavement 2,620.00 700.0 700
grass/weeds 0.00 0.0 0
TOTAL 2,620.00 700.0 700.00
Basin C(same for existing&proposed) AREA %OF IMPERV
(SF.) TOTAL AREA %
grevel 0.00 0.0 40
pavement/roof 77,700.00 77.4 700
gress/landscaping 3,250.00 22.6 0
TOTAL 74,350.00 700.0 77.352
Basin E(existing west side) AREA %OF IMPERV
(SF.) TOTAL AREA %
gravel 9,860.00 86.3 40
pavement 660.00 5.8 700
gress/weeds 970.00 8.0 0
TOTAL 77,430.00 700.0 40.28
Basin P(proposed west side) AREA %OF IMPERV
(SF.) TOTAL AREA %
grevel 70,780.00 94.3 40
pavement(P7) 350.00 3.7 700
gress/landscaping 300.00 2.6 0
TOTAL 77,430.00 700.0 40.79
EXISTING CONDITIONS(entire site) AREA %OF IMPERV
(SF.) TOTAL AREA %
BASIN E 77,430.00 40.2 40.28
BASIN B 2,620.00 9.2 700
BASIN C 74,350.00 50.5 77.35
TOTAL 28,400.00 700.0 64.52
EXISTING CONDITIONS(entire site by surface) AREA %OF IMPERV
(SF.) TOTAL AREA %
grevel 9,860.00 34.7 40.28
pavement/roof 74,380.00 50.6 700
grass/landscaping 4,760.00 74.6 77.35
TOTAL 28,400.00 700.0 75.95
PROPOSED CONDITIONS(entire site) AREA %OF IMPERV
(SF.) TOTAL AREA %
BASIN P 77,430.00 40.2 40.79
BASIN B 2,620.00 9.2 700
BASIN C 74,350.00 50.5 77.35
TOTAL 28,400.00 700.0 64.73
PROP.CONDITIONS(entire site by surface) AREA %OF IMPERV
(SF.) TOTAL AREA %
gravel 70,780.00 38.0 40.79
pavement/roof 74,070.00 49.5 700
gress/landscaping 3,550.00 72.5 77.35
TOTAL 28,400.00 700.0 74.69
CHANGE FROM EXIST TO PROP.CONDITION* AREA
(SF.)
gravel 920.00
pavement/roof -370.00
grass/landscaping -670.00
*Assumes negligible change in Basins B&C
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