Technical Memorandum Summary of Field Work Overlake ... 3 - Draft - Summary of Field Work... · Technical Memorandum Summary of Field Work Overlake Village Stormwater and Park Facilities

Technical Memorandum Summary of Field Work

Overlake Village Stormwater and Park Facilities Conceptual Design

Submitted to: City of Redmond

15670 NE 85th Street Redmond, WA 98073

Prepared by: Otak, Inc.

10230 NE Points Drive, Suite 400 Kirkland, WA 98033

Otak Project No. 31470

June 30, 2009

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Draft

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City of Redmond 12/28/2009 Draft Document Released for Public Records Request This document is a working draft, not intended for public release. City staff are working with the consultant to produce a final document that will be posted to the City website in the near future. There may be inaccurate information or mistakes within this draft document that has not had the benefit of a complete City review and approval. Users of this draft are encouraged to review the final document when it is available.


O v e r l a k e V i l l a g e F i e l d R e c o n n a i s s a n c e 1 otak

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tricts

ment A.

Overlake Village Project Overview The Overlake Village Stormwater and Park Facilities Conceptual Design project has been initiated by the City of Redmond to develop a conceptual design that best integrates regional stormwater treatment, detention facilities, and park facilities into the Overlake Village neighborhood. Collocated facilities are desired to minimize land requirements and to offer visiting residents an enhanced experience through the melding of environmental protection and park functions. The City’s Master Plan & Implementation Strategy for the Overlake Neighborhood defines proposed actions for three districts within its boundaries: the Residential Area in the northeast, the Employment Area in the central-west area, and Overlake Village in the southerly area. The boundaries of the Overlake Neighborhood and its three disare shown in Figure 1 of Attachment A. The City’s concept plan for Overlake Village is shown in Figure 2 of Attach Field Work Purpose and Scope The purpose of the field work task is to provide information to input and guide the development of the project’s conceptual design. The task scope of work includes (1) field reconnaissance of the project area including potential stormwater and park development sites, (2) identification of the conveyance system points of entry and exit from the two potential sites, and (3) field checking of invert elevations at critical locations within the existing conveyance system. Project Base Mapping Current GIS data was obtained from the City including utilities, edge of pavement, right of way, stormwater pipes including upstream and downstream inverts, storm water manholes and catch basins including rim elevations, and aerials. Northwest Hydraulic Consultants (NHC) developed basin boundaries for the Overlake Village and evaluated the conveyance system during construction of the basin hydraulic model. NHC supplied Otak with its GIS based information for use in this project. Base maps of the project have been prepared at a 1”=100’ scale as a part of this task. The base maps cover the area between 148th Avenue NE


Continued



to the west and 152nd Avenue NE to the east, and SR 520/152nd Avenue NE to the north and NE 20th Street to the south (see Attachment B). Field Reconnaissance Field reconnaissance of the project site was performed during June 2009 by Otak team members. Existing development within Overlake Village is typically low rise commercial and retail. The PS Business Park, Safeway and other commercial/retail properties are located between 148th Avenue NE and 152nd Avenue NE, north of NE 24th Street. The Group Health property, Microsoft and commercial retail properties are located to the east of 152nd Avenue NE and north of NE 24th Street. Sears retail and auto service centers and one story retail buildings are located between 148th Avenue NE and 152nd Avenue NE, south of NE 24th Street. The potential stormwater facility sites were field reviewed as was the conveyance system through those sites. The northernmost entry point to the project area conveyance system is at the SR 520 corridor and 152nd Avenue NE. Other key points within the conveyance system include manholes in the 152nd Avenue NE, NE 24th Street and NE 20th Street. From review of the project stormwater system, a total of six manhole/catch basins were identified where verification of City GIS invert elevations would be warranted in order to confidently develop stormwater facility concepts. The locations of these manhole/catch basins include the entry and exit storm drains from the two facility study areas above and below NE 24th Street. The six locations were visited and photographed during the field reconnaissance. The six locations are shown in Figure 3 of Attachment A. Photograph locations are shown in Figure 4 of Attachment A. The photolog is included in Attachment C.


Continued



Stormwater Conveyance Critical Invert Analysis The critical inverts were determined from a review of the base mapping and concept plan. Otak staff surveyed rim elevation and all inverts associated with the six critical stormwater manholes/catch basins. Survey grade GPS equipment and total station instruments were used for the survey and the data was referenced to City of Redmond datum by measuring a published City benchmark. The estimated relative vertical accuracy is 0.15 feet with a 95% confidence. The results of the survey and comparison to City GIS information is provided in Table 1 below. The majority of the inverts are within a few tenths of a foot of the City GIS values. However at CB #1, the invert elevation values found by field survey are typically in excess of 6 feet lower than the GIS data. One invert at CB #4 and two inverts at CB #6 (East) are significantly higher than given in the GIS data. Inverts that were substantially different than the GIS values were subjected to a second review by Otak, which confirmed the Otak values as correct. The Otak field survey inverts will be used in the development of stormwater facilities for the conceptual design.

Table 1 Critical Invert Field Survey Results

Northing Easting Rim Elev. Inverts Dir. Elev. Rim Inverts Dir. Elev. Rim InvertsCB #1 235094.220 1318839.539 336.77 36" CONC SW 321.47 343.3 36" RCP S 327.95 6.53 6.48

36" CONC NE 321.77 36" CSP NE 328.05 6.2818" CMP E 322.37 18" CAP E 328.50 6.13

24" CONC E 325.07 24" CONC NE 331.43 6.3624" CONC S 328.47 - S - n/a

8" CMP S 331.07 15" RCP SE 335.45 4.380.00

CB #2 234425.493 1318179.730 337.19 30" CONC E 313.93 336.96 30" CONC E 313.57 -0.23 -0.3630" CONC W 314.01 30" CONC W 313.65 -0.3624" CONC S 314.84 unknown S unknown -12" HDPE NE 327.89 unknown NE unknown -

CB #3 234424.250 1318833.968 327.17 42" CONC S 310.07 326.95 36" CONC S 310.31 -0.22 0.24(72") 36" CONC N 310.72 36" CONC N 310.28 -0.44

30" CONC W 310.97 30" CONC W 311.09 0.1224" CONC E 311.22 - - - n/a

CB #4 233050.927 1318288.543 306.24 48" CONC S 295.29 306.32 48" CONC S 295.57 0.08 0.28(96") 48" CONC E 295.49 48" CONC E 295.23 -0.26

8" CMP SE 299.14 12" CAP SE 296.50 -2.64

CB #5 232209.058 1318267.606 303.88 48" CONC S 290.93 - 48" CONC S 290.72 N/a -0.21(96") 48" CONC N 290.95 48" CONC N 290.78 -0.17

-CB #6(E) 231799.524 1317740.506 295.31 48" HDPE W 272.75 295.1 48" CSP W 272.48 -0.20 -0.27(72") 48" HDPE NE 285.36 48" HDPE NE 272.50 -12.86

8" CMP S 285.91 12" CAP SE 283.9 -2.01- - - 12" CONC E 285.14 n/a- - - 12" CONC NW - n/a

CB #6(W) 231799.347 1317731.343 295.27 48" HDPE W 271.97 295.67 48" CSP W 271.43 0.40 -0.54(60") 48" HDPE E 272.12 48" CSP E 272.53 0.41

30" HDPE N 272.82 unknown N unknown n/a12" CONC N 289.52 - - - n/a12" PVC S 284.27 12" PVC S 284.37 0.10

Elevation ΔCity of Redmond GISOtak Survey


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Attachments Attachment A—Figures

Figure 1—Vicinity Map Figure 2—Overlake Village Concept Plan Figure 3—Critical Invert Locations Figure 4—Field Photo Locations

Attachment B—Project Base Mapping Attachment C—Reconnaissance Photolog

A t t a c h m e n t A — F i g u r e s

S R 5

2 0 E

B

S R 5

2 0 E

B

S R 5 2 0 W BS R 5 2 0 W B

148t

h AV

E N

E1 4

8 th

A VE

NE

156 t

h A V

E N

E1 5

6 th

A VE

NE

B E L - R E D R DB E L - R E D R D

N E 4 0 t h S TN E 4 0 t h S T

N E 5 1 s t S TN E 5 1 s t S T

EB 5 2 0 B

y p a s s

E B 5 2 0 B

y p a s s

WB

52 0

By p

a ss

WB

52 0

By p

a ss

1 72 n

d A V

E N

E1 7

2 nd

A VE

NE

W L K S A M M A M I S H P K W

Y

W L K S A M M A M I S H P K W

Y

O L D R E D M O N D R DO L D R E D M O N D R D



140t

h AV

E N

E1 4

0 th

A VE

NE

150t

h AV

E N

E15

0th

AVE

NE


157t

h AV

E N

E1 5

7 th

A VE

NE

1 37 t

h A V

E N

E1 3

7 th

A VE

NE


162n

d AV

E N

E1 6

2 nd

A VE

NE

1 52 n

d A V

E N

E1 5

2 nd

A VE

NE

1 54 t

h A V

E N

E1 5

4 th

A VE

NE

N E 7 2 n d W YN E 7 2 n d W Y


N E 6 9 t h S TN E 6 9 t h S T B E A R C R E E K P K W YB E A R C R E E K P K W Y

N E 3 1 s t W YN E 3 1 s t W Y

N E 6 2 n d S TN E 6 2 n d S T



159t

h AV

E N

E1 5

9 th

A VE

NE


N E 5 3 r d S TN E 5 3 r d S T

N E 7 2 n d S TN E 7 2 n d S T





N E 5 5 t h S TN E 5 5 t h S T14

5th

A VE

NE

1 45 t

h A V

E N

E

N E 6 2 n d C TN E 6 2 n d C T

136t

h AV

E N

E1 3

6 th

A VE

NE

1 61 s

t P L

NE

1 61 s

t P L

NE

1 52 n

d A V

E N

E1 5

2 nd

A VE

NE



150 t

h A V

E N

E1 5

0 th

A VE

NE

Figure 1Vicinity MapOverlake Village Stormwater and Park Facilites Conceptual Design

TO SHELTON

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C I T Y O FC I T Y O FR E D M O N DR E D M O N D

REFERENCE MAP

PROJECT LOCATION

C I T YC I T YO FO F

S A M M A M I S HS A M M A M I S HC I T YC I T YO FO F

B E L L E V U EB E L L E V U E

C I T YC I T YO FO F

K I R K L A N DK I R K L A N D

405

520

L a k eW a s h i n g t o n

0 1,800 3,600900Feet

LegendRedmond City Limit

Overlake Village District

Employment District

Residential District

Figure 2Overlake Village StrategiesOverlake Village Stormwater and Park Facilites Conceptual Design

TO SHELTON

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PROJECT AREA IN DETAIL

Source: Redmond Overlake Master Plan & Implementation Strategy 12/5/09

B E L - R E D R D

B E L - R E D R D


148t

h AV

E N

E1 4

8 th

A VE

NE

1 52 n

d A V

E N

E1 5

2 nd

A VE

NE


156t

h AV

E N

E1 5

6 th

A VE

NE

N E 3 1 s t S TN E 3 1 s t S TN E 3 1 s t W YN E 3 1 s t W Y



151s

t PL

NE

151s

t PL

NE


N E 3 1 s t C LN E 3 1 s t C L

B E L - R E D R D

B E L - R E D R D


Location # 1

Location # 2 Location # 3

Location # 4

Location # 5

Location # 6

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Date of Aerial Photography: 2007

Figure 3Critical Invert Locations

Overlake Village Stormwater and Park Facilites Conceptual Design

0 400 800

Feet1 in = 400 ft

520 LegendRedmond City Limit

Culvert

Pipe

Bioswale

Bioswale Edge

Catch Basin

CS

Manhole

Overlake Village Boundary

Parcel Boundary

Key Locations

ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ ââââââââââââââ ââ

ââ ââââââââ ââ ââ ââ

ââ ââ ââââ ââ

ââ ââââ ââââ ââââââââââââââââââââââââ ââââââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââ ââââââââ ââââ ââââ ââââ ââ

ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââ ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ

ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ

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B E L - R E D R D

B E L - R E D R D


148t

h AV

E N

E1 4

8 th

A VE

NE

1 52 n

d A V

E N

E1 5

2 nd

A VE

NE


156t

h AV

E N

E1 5

6 th

A VE

NE

N E 3 1 s t S TN E 3 1 s t S TN E 3 1 s t W YN E 3 1 s t W Y



151s

t PL

NE

151s

t PL

NE


N E 3 1 s t C LN E 3 1 s t C L

B E L - R E D R D

B E L - R E D R D


# 9

# 17

# 1 - 3

# 4 - 8

# 10 - 16

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Date of Aerial Photography: 2007

F

Figure 4Photo Locations

Overlake Village Stormwater and Park Facilites Conceptual Design

0 400 800

Feet1 in = 400 ft

520

!(

LegendRedmond City Limit

ââââââââ ââ ââ ââ ââ ââââââ ââââââââââââ Overlake Village Boundary

Parcel Boundary

Photo Locations

A t t a c h m e n t B — P r o j e c t B a s e M a p p i n g

A t t a c h m e n t C — R e c o n n a i s s a n c e P h o t o l o g

Attachment C—Photolog


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Photo #1—Critical conveyance invert location #4, Southeast corner of NE 24th Street and 151st Place NE. Facing west.

Photo #2—Critical conveyance invert location #4, Southeast corner of NE 24th Street and 151st Place NE. Facing south.

Attachment C—Photolog Continued



Photo #3—Critical conveyance invert location #4, Southeast corner of NE 24th Street and 151st Place NE. Facing east.

Photo #4— PS Business Park parking lot. Facing north.




Photo #5— PS Business Park parking lot. Facing north.

Photo #6— PS office parking lot, facing northwest.




Photo #7— Critical conveyance invert location #3, 1 52nd Avenue NE. Facing northeast.

Photo #8—Critical conveyance invert location #3, 152nd Avenue NE. Facing southeast.




Photo #9—Group Health Eastside Hospital.

Photo #10—152nd Avenue NE. Facing north.




Photo #11—152nd Avenue NE. Facing south.

Photo #12—152nd Avenue NE. Facing south.




Photo #13—152nd Avenue NE. Facing north.

Photo #14—152nd Avenue NE, facing south.




Photo #15—152nd Avenue NE, facing north.

Photo #16—PS Business Park parking lot, facing west.




Photo #17—Critical conveyance invert location #6, NE 20th Street, facing east.

Documents

Technical Memorandum Summary of Field Work Overlake ... 3 - Draft - Summary of Field Work... · Technical Memorandum Summary of Field Work Overlake Village Stormwater and Park Facilities