HomeMy WebLinkAboutWPO201800031 Calculations WPO VSMP 2018-09-17 PROJECT MANAGEMENT
CIVIL ENGINEERING
LAND PLANNING
ENGINEERING
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September 17th, 2018 �"�• r ,
John Anderson J M M. STUMP y
Albemarle County Department of Community Development / 17ii183
401 McIntire Road 1� !
Charlottesville, VA 22902 o, s � ti;<<
' SIONAL
Regarding: Hollymead Town Center Hotel
Stormwater Management Plan
Dear Mr.Anderson,
Enclosed are the calculations and details relating to stormwater quantity and quality for the proposed
development of the HTC Hotel at the Hollymead Town Center. Stormwater management on site is
grandfathered as per 4VAC50-60-48. All runoff shall be routed through new culverts and channels into the
existing sediment forebays into the regional stormwater detention pond. Per correspondence from
Albemarle County,the stormwater pond for the Hollymead PDMC was designed for a maximum
impervious cover of 85% to meet the requirements for stormwater quality and quantity. As shown on the
included Open Space Exhibit, the new development of TM-32-41D5 has an impervious cover of 66.5%.
The proposed plan meets the stormwater design regulations for this parcel.
If you have any questions please do not hesitate to contact me at your earliest opportunity. I may be
reached at: Justinna shimp-engineerinq.com or by phone at 434-227-5140.
Yours Truly
Justin Shimp, P.E.
Shimp Engineering, P.C.
Contents:
Stormwater Management Drainage Maps:
Open Space Exhibit
Pre-Development Drainage Map
Post-Development Drainage Map
Post-Development Stormwater Management Calculations:
VDOT LD-204
VDOT LD-229
VDOT LD-347
Independent Reports:
Excerpt from NRCS Soils Report
NOAA Precipitation Report
Stormwater Management Drainage Maps:
Open Space Exhibit
Pre-Development Drainage Map
Post-Development Drainage Map
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EN ER NG-IAMPL4N%7NG-PROJECT MANAGEMENT
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— CHARLOTTESVILLE, VA 22902 JUSTIN.SHIMP—ENGINEERING.COM
Post-Development Stormwater Management Calculations:
VDOT LD-204
VDOT LD-229
VDOT LD-347
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LD-229 Storm Drain Design Computations
HTC Hotel Site
From To Point Catch Runoff Inc Accum Tot Tot Tot Up Dn Pipe Inv Pipe Pipe Velocity Flow time
Point A Coef AC AC Tc Int Flow Inv Inv Len S Dim Cap Inc
(ac) (min) (in/hr) (cfs) El El (ft) % (in) (cfs) _ (ft/s) _ (min)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 _ 16 17
ST-8 ST-7 0.7 0.7 0.49 0.49 5.0 6.49 3.18 542.0 541.3 80 0.84% 24 20.73 3.7 0.36
B1 ST-7 0.58 0.8 0.464 0.464 5.0 6.5 3.0 542.0 541.4 163.13 0.35% 15 I 3.767 3.4 0.80
ST-7 ST-6 0 0.75 0 0.95 5.8 6.24 5.95 539.7 539.4 24.68 1.34% 24 26.187 6.2 0.07
C1 ST-5 0.61 0.80 0.49 0.49 5.0 6.5 3.2 533.9 533.7 6.87 3.49% 15 12.1 8.3 0.01
ST-5 ST-1 0.28 0.80 0.22 0.71 5.0 6.49 4.62 533.36 533 40.4 0.89% 15 6.5 5.5 0.12
ST-4 ST-3 0.49 0.9 0.44 0.44 5.0 6.49 2.85 534.10 534.00 13.0 0.8% 18 9.4 4.7 0.05
ST-3 ST-2 0.06 0.9 0.05 0.49 5.0 6.47 3.20 534.00 533.67 64.5 0.5% 18 7.4 4.0 0.27
ST-2 ST-1 0.15 0.9 0.14 0.63 5.3 6.39 4.02 533.50 532.90 114.7 0.5% 18 7.4 _ 4.3 _ 0.44 _
ST-1 EX 0.00 0.0 0.00 1.34 5.0 6.49 8.70 529.69 529.59 10.0 1.0% 36 66.7 6.4 0.03
ST-11 ST-10 0.71 0.7 0.497 0.497 5.0 6.5 3.2 542.9 542.5 20.5 1.95% 15 9.021 6.7 0.05
ST-10 ST-9 0.07 0.8 0.056 0.553 5.0 6.5 3.6 542.4 542.0 20.75 1.93% 15 8.974 6.9 0.05
HTC HOTEL
LD-347 Hydraulic Grade Line
Junction Loss
Outlet Inlet
Water Water
Surface Surface
Inlet Number Elev.` Do Oo Lo S f a% Hf Vo Ho 0, V, 0,V, H; Angle Ho Ht 1.3*Ht 0.5Ht Final H Elev. Rim. Elev
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17) (18) (19) (20) (21)
ST-7 541.00 2.00 5.95 24.68 0.0693% 0.0171 6.166 0.1476 3.178 3.727 11.8 0.0755 0 0.0000 0.3240 0.4212 0.438 541.44 548.15
3.009 3.407 10.3 0.0631 60 0.1009
ST-8 542.93 2.00 3.18 80.00 0.0197% 0.0158 3.727 0.0539 0.0539 0.0701 0.086 543.02 548.50
B1 542.43 1.25 3.01 163.13 0.2171% 0.3541 3.407 0.0451 0.0451 0.0586 0.413 542.84 545.50
ST-10 543.00 1.25 3.59 20.75 0.3083% 0.0640 6.911 0.1854 3.223 6.724 21.7 0.2457 0 0.0000 0.4311 0.5605 0.624 543.62 549.17
ST-11 543.62 1.25 3.22 20.50 0.2490% 0.0511 6.724 0.1755 0.1755 0.2282 0.279 543.90 549.17
ST-1 531.99 3.00 8.70 10.00 0.0170% 0.0017 6.354 0.1567 4.017 4.300 17.3 0.1005 0 0.0000 0.3761 0.4889 0.491 532.48 537.50
4.618 5.507 25.4 0.1648 14 _ 0.0546
ST-2 534.10 1.50 4.02 114.70 0.1463% 0.1678 4.300 0.0718 3.196 4.000 12.8 0.0870 90 0.1739 0.3326 0.4324 0.600 534.70 538.35
ST-3 534.87 1.50 3.20 64.50 0.0926% 0.0597 4.000 0.0621 2.854 4.700 13.4 0.1201 0 0.0000 0.1822 0.2368 0.297 535.17 538.90
ST-4 535.20 1.50 2.85 13.00 0.0738% 0.0096 4.700 0.0858 0.0858 0.1115 0.121 535.32 537.36
ST-5 534.00 1.25 4.62 40.40 0.51 1 1% 0.2065 5.507 0.1177 3.165 8.308 26.3 0.3751 45 0.4930 0.9859 1.2816 1.488 535.49 538.36
C 1 535.49 1.25 3.16 6.87 0.2401% 0.0165 8.308 0.2679 0.2679 0.3483 0.365 535.85 541.50
Independent Reports:
Excerpt from NRCS Soils Report
NOAA Precipitation Report
USDA United States A product of the National Custom Soil Resource
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MAP LEGEND MAP INFORMATION
Area of Interest(A01) g Spoil Area The soil surveys that comprise your AOI were mapped at
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U Soil Map Unit Polygons Warning:Soil Map may not be valid at this scale.
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Gravel Pit Source of Map: Natural Resources Conservation Service
US Routes Web Soil Survey URL:
Gravelly Spot Major Roads Coordinate System: Web Mercator(EPSG:3857)
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A. Lava Flow Background projection,which preserves direction and shape but distorts
distance and area.A projection that preserves area,such as the
46 Marsh or swamp . Aerial Photography Albers equal-area conic projection,should be used if more
Mine or Quarry accurate calculations of distance or area are required.
O Miscellaneous Water This product is generated from the USDA-NRCS certified data as
O Perennial Water of the version date(s)listed below.
�p Rock Outcrop Soil Survey Area: Albemarle County,Virginia
4. Saline Spot Survey Area Data: Version 10, Dec 11,2013
Sandy Spot Soil map units are labeled(as space allows)for map scales
ip, Severely Eroded Spot 1:50,000 or larger.
Q Sinkhole Date(s)aerial images were photographed: Apr 22,2015—Mar
3) Slide or Slip 10,2017
0o Sodic Spot The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps.As a result,some minor
shifting of map unit boundaries may be evident.
10
Custom Soil Resource Report
Map Unit Legend
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
27B Elioak loam,2 to 7 percent 3.9 43.6%
slopes
27C Elioak loam,7 to 15 percent 0.6 7.0%
slopes
28C3 Elioak clay loam,7 to 15 1.4 15.0%
percent slopes,severely
eroded
34D Glenelg loam, 15 to 25 percent 3.1 34.4%
slopes
Totals for Area of Interest 9.0 100.0%
Map Unit Descriptions
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. If included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
11
Custom Soil Resource Report
Albemarle County, Virginia
27B—Elioak loam, 2 to 7 percent slopes
Map Unit Setting
National map unit symbol: kb8y
Mean annual precipitation: 25 to 65 inches
Mean annual air temperature: 54 to 59 degrees F
Frost-free period: 195 to 231 days
Farmland classification: All areas are prime farmland
Map Unit Composition
Elioak and similar soils: 80 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Elioak
Setting
Landform: Hillslopes
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from mica schist
Typical profile
H1 - 0 to 8 inches: loam
H2- 8 to 39 inches: silty clay
H3-39 to 79 inches: silt loam
Properties and qualities
Slope: 2 to 7 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to
high (0.20 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Moderate (about 6.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 2e
Hydrologic Soil Group: B
Hydric soil rating: No
13
Custom Soil Resource Report
27C—Elioak loam, 7 to 15 percent slopes
Map Unit Setting
National map unit symbol: kb8z
Mean annual precipitation: 25 to 65 inches
Mean annual air temperature: 54 to 59 degrees F
Frost-free period: 195 to 231 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Elioak and similar soils: 80 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Elioak
Setting
Landform: Hillslopes
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from mica schist
Typical profile
H1 - 0 to 8 inches: loam
H2- 8 to 39 inches: silty clay
H3-39 to 79 inches: silt loam
Properties and qualities
Slope: 7 to 15 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to
high (0.20 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Moderate (about 6.6 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 3e
Hydrologic Soil Group: B
Hydric soil rating: No
14
Custom Soil Resource Report
28C3—Elioak clay loam, 7 to 15 percent slopes, severely eroded
Map Unit Setting
National map unit symbol: kb91
Mean annual precipitation: 25 to 65 inches
Mean annual air temperature: 54 to 59 degrees F
Frost-free period: 195 to 231 days
Farmland classification: Not prime farmland
Map Unit Composition
Elioak and similar soils: 80 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Elioak
Setting
Landform: Hillslopes
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from mica schist
Typical profile
H1 - 0 to 8 inches: clay loam
H2- 8 to 39 inches: silty clay
H3-39 to 79 inches: silt loam
Properties and qualities
Slope: 7 to 15 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to
high (0.20 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: Low(about 6.0 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: B
Hydric soil rating: No
15
Custom Soil Resource Report
34D—Glenelg loam, 15 to 25 percent slopes
Map Unit Setting
National map unit symbol: kb9m
Mean annual precipitation: 25 to 65 inches
Mean annual air temperature: 54 to 59 degrees F
Frost-free period: 195 to 231 days
Farmland classification: Farmland of statewide importance
Map Unit Composition
Glenelg and similar soils: 80 percent
Estimates are based on observations, descriptions, and transects of the mapunit.
Description of Glenelg
Setting
Landform: Hillslopes
Landform position (two-dimensional): Summit
Landform position (three-dimensional): Interfluve
Down-slope shape: Convex
Across-slope shape: Convex
Parent material: Residuum weathered from mica schist
Typical profile
H1 - 0 to 8 inches: loam
H2- 8 to 28 inches: silty clay loam
H3-28 to 80 inches: loam
Properties and qualities
Slope: 15 to 25 percent
Depth to restrictive feature: More than 80 inches
Natural drainage class: Well drained
Runoff class: High
Capacity of the most limiting layer to transmit water(Ksat): Moderately high to
high (0.57 to 1.98 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Available water storage in profile: High (about 9.7 inches)
Interpretive groups
Land capability classification (irrigated): None specified
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: B
Hydric soil rating: No
16
Custom Soil Resource Report
Table—Hydrologic Soil Group
Map unit symbol 1 Map unit name Rating Acres in AOI Percent of AOI
- --- ---
27B Elioak loam,2 to 7 B 3.9 43.6%
percent slopes
27C Elioak loam,7 to 15 B 0.6 7.0%
percent slopes
28C3 Elioak clay loam,7 to 15 B 1.4 15.0%
percent slopes,
severely eroded
34D Glenelg loam, 15 to 25 B 3.1 34.4%
percent slopes
Totals for Area of Interest 9.0 100.0%
Rating Options—Hydrologic Soil Group
Aggregation Method: Dominant Condition
Component Percent Cutoff. None Specified
Tie-break Rule: Higher
21
5/3/2018 Precipitation Frequency Data Server
NOAA Atlas 14,Volume 2,Version 3
'� Location name:Charlottesville,Virginia,USA* r- '`"
Latitude:38.1297°,Longitude:-78.4399° norms
Elevation:555.67 ft**
`,�e�or *source:ESRI Maps .+,
y°r **source:USGS ""'`
POINT PRECIPITATION FREQUENCY ESTIMATES
G.M.Bonnin,D.Martin,B.Lin,T.Parzybok,M.Yekta,and D.Riley
NOAA,National Weather Service,Silver Spring,Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches/hour)1
Average recurrence interval(years)
Duration
1 2 5 10 25 50 100 200 500 1000
5-min 4.20 5.00 5.88 6.61 7.46 8.12 8.75 9.34 10.1 10.7
(3.79-4.64) (4.52-5.54) (5.30-6.50) (5.95-7.31) (6.68-8.22) (7.24-8.95) (7.75-9.64) (8.21-10.3) (8.76-11.1) (9.18-11.8)
10-min 3.35 4.00 4.71 5.29 5.95 6.47 6.95 7.40 7.96 8.39
(3.02-3.71) (3.62-4.43) (4.24-5.21) (4.76-5.85) (5.32-6.55) (5.76-7.12) (6.16-7.65) (6.51-8.15) (6.92-8.80) (7.23-9.31)
2.79 3.36 3.97 4.46 5.02 5.46 5.86 6.23 6.68 7.02
15-min (2.52-3.09) (3.03-3.72) (3.58-4.39) (4.01-4.93) (4.50-5.54) (4.86-6.01) (5.19-6.45) (5.48-6.86) (5.81-7.39) (6.05-7.79)
1.91 2.32 2.82 3.23 3.72 4.11 4.49 4.85 5.32 5.69
30-min (1.73-2.12) (2.09-2.57) (2.54-3.12) (2.91-3.57) (3.33-4.10) (3.66-4.53) (3.97-4.94) (4.26-5.34) (4.62-5.88) (4.90-6.31)
1.19 1.45 1.81 2.10 2.48 2.79 3.09 3.40 3.81 4.15
60-min (1 08-1.32) (1.31-1.61) (1.63-2.00) (1.89-2.33) (2.22-2.73) (2.48-3.07) (2 74-3.40) (2.99-3 75) (3.32-4.22) (3.58-4.61)
2-hr 0.716 0.871 1.09 1.28 1.53 1.74 1.95 2.18 2.49 2.76
(0.636-0.812) (0771-0.986) (0.965-1.23) (113-1.45) (1.34-1.72) (1.52-1.96) (1.69-2.19) (1.87-2.45) (2.12-2.81) (2.32-3.12)
3-hr 0.522 0.634 0.793 0.930 1.11 1.26 1.42 1.59 1.82 2.02
(0.461-0.597) (0.557-0.724) (0.696-0.906) (0.815-1.06) (0.969-1.26) (1.10-1.44) (1.22-1.61) (1.36-1.81) (1.54-2.07) (1.69-2.30)
0.333 0.403 0.500 0.589 0.708 0.813 0.923 1.04 1.21 1.37
6-hr (0.295-0.378) (0.356-0.457) (0.441-0.567) (0.517-0.667) (0.618-0.802) (0.704-0.918) (0.792-1.04) (0.884-1.18) (1.01-1.37) (1.13-1.55)
12-hr 0.208 0.250 0.312 0.369 0.450 0.521 0.599 0.685 0.812 0.927
(0.184-0.237) (0.221-0.286) (0.275-0.357) (0.324-0.421) (0.391-0.511) (0.449-0.592) (0.510-0.679) (0.575-0.776) (0.668-0.922) (0.750-1.05)
24-hr 0.124 0.150 0.192 0.227 0.279 0.323 0.372 0.426 0.506 0.575
(0.111-0.140) (0.135-0.169) (0.172-0.216) (0.202-0.255) (0.247-0.312) (0.284-0.361) (0.324-0.415) (0.367-0.474) (0.430-0.563) (0.481-0.640)
0.073 0.089 0.113 0.132 0.161 0.185 0.211 0.239 0.281 0.315
2-day (0.066-0.082) (0.080-0.099) (0.101-0.126) (0.119-0.148) (0.143-0.179) (0.163-0.206) (0.185-0.234) (0.208-0.266) (0.241-0.313) (0.267-0.352)
0.052 0.063 0.080 0.094 0.114 0.131 0.149 0.169 0.198 0.223
3-day (0.047-0.058) (0.057-0.070) (0.072-0.089) (0.085-0.104) (0.103-0.126) (0.117-0.145) (0.132-0.165) (0.149-0.187) (0.172-0.220) (0.191-0.247)
0.041 0.050 0.064 0.075 0.091 0.104 0.119 0.134 0.157 0.176
4-day (0.038-0.046) (0.046-0.055) (0.058-0.070) (0.068-0.082) (0.082-0.100) (0.094-0.114) (0.106-0.130) (0.119-0.148) (0.138-0.173) (0.153-0.195)
0.027 0.033 0.041 0.048 0.058 0.066 0.075 0.084 0.097 0.108
7-day (0.025-0.030) (0.030-0.036) (0.038-0.045) (0.044-0.053) (0.052-0.063) (0.060-0.072) (0.067-0.082) (0.075-0.092) (0.085-0.107) (0.094-0.119)
10-day 0.022 0.026 0.032 0.037 0.044 0.050 0.056 0.062 0.072 0.079
(0.020-0.024) (0.024-0.028) (0.030-0.035) (0.034-0.040) (0.040-0.048) (0.046-0.054) (0.051-0.061) (0.056-0.068) (0.064-0.078) (0.070-0.086)
20-day 0.014 0.017 0.021 0.023 0.027 0.030 0.033 0.036 0.041 0.044
(0.013-0.015) (0.016-0.018) (0.019-0.022) (0.022-0.025) (0.025-0.029) (0.028-0.032) (0.031-0.036) (0.033-0.039) (0.037-0.044) (0.040-0.047)
30-day 0.012 0.014 0.016 0.018 0.021 0.023 0.025 0.026 0.029 0.031
(0.011-0.013) (0.013-0.015) (0.015-0 018) (0.017-0.020) (0.020-0.022) (0.021-0.024) (0.023-0.026) (0.025-0.028) (0.027-0.031) (0.028-0.033)
45-day 0.010 0.012 0.013 0.015 0.017 0.018 0.019 0.021 0.022 0.024
(0.009-0.010) (0.011-0.012) (0.013-0.014) (0.014-0.016) (0.016-0.018) (0.017-0.019) (0.018-0.021) (0.019-0.022) (0.021-0.024) (0.022-0.025)
60-day 0.009 0.010 0.012 0.013 0.014 0.015 0.016 0.017 0.019 0.020
(0.008-0.009) (0.010-0.011) (0.011-0.012) (0.012-0.014) (0.013-0.015) (0.014-0.016) (0.015-0.017) (0.016-0.018) (0.017-0.020) (0.018-0.021)
1 Precipitation frequency(PF)estimates in this table are based on frequency analysis of partial duration series(PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90%confidence interval.The probability that precipitation frequency estimates(for
a given duration and average recurrence interval)will be greater than the upper bound(or less than the lower bound)is 5%.Estimates at upper bounds are not
checked against probable maximum precipitation(PMP)estimates and may be higher than currently valid PMP values.
Please refer to NOAA Atlas 14 document for more information.
Back to Top
PF graphical
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=38.1297&Ion=-78.4399&data=intensity&units=english&series=ams#top 1/4