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Aloe Palo verde Paving Shade structure fabric Bougainvillea Permeable paving Xeriscape Desert grass Bench Pedestrian lighting Planter rock Wall mounted lighting Calexico Urban Planning Feasibility Study General Services Administration GS-09P-15-KT-D-0009 May 11, 2016

Calexico Urban Planning Feasibility Study CALEXICO URBAN ... · Aloe Palo verde Paving Shade structure fabric Bougainvillea ... Bench Pedestrian lighting Planter rock Wall mounted

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Aloe

Palo verde

Paving

Shade structure fabric

Bougainvillea

Permeable pavingXeriscape

Desert grass

Bench

Pedestrian lighting

Planter rock

Wall mounted lighting

Calexico Urban Planning Feasibility StudyCALEXICO URBAN PLANNING FEASIBILITY STUDYCOST ESTIMATE DRAWINGS 03-22-2016

UNITED STATESMEXICIO

CALEXICO, CA

PROJECT LOCATION

WALL MOUNTED LIGHTINGLIGHTOPIA CLESSIDRA LEDOUTDOOR WALL SCONCE

BENCHVECTOR SEATING SYSTEM

PEDESTRIAN LIGHTINGALCOTT FORMS

TRASH RECEPTACLEFORMS+SURFACES KNIGHT

PLANK PAVINGPROMENADE

PERVIOUS PAVING

PLANTER ROCK

SHADE STRUCTURE FABRICPALO VERDE TREES AGAVE

DESERT GRASSES

MAGENTA AND ORANGEBOUGAINVILLEA

XERISCAPE

General Services Administration GS-09P-15-KT-D-0009 May 11, 2016

Downtown Calexico acts as the focal point of the city and its commerce. In addition to providing a welcoming, safe, and family orient-ed gathering place, it also reflects the cultural character of this southern border community. Recent developments in the area includ-ing a proposed design for a new downtown transit center on Third Street and Rockwood and the renovation of the existing pedestrian border crossing, pose an economic opportunity for the merchants in the area. GSA understands the impact of these developments on the community and is invested in using quality design to support community goals and identify opportunities that catalyze economic development.

This booklet includes the final recommendation that resulted from a feasibility study sponsored by the GSA Urban Development Program. The feasibility study was a product of a stakeholder survey, a visioning session, and a design workshop that included the involvement of stakeholders, planners and design professionals. It includes a recommended route for relocating a power transmission line that has been displaced from the renovation construction at the Land Port of Entry from overhead to underground in addition to the vision for improving the streets and public spaces of the downtown area. This vision includes two primary design concepts and one lighting concept: Retreat, Revive, and Relight.

This booklet is intended to be used as a tool for grant award purposes exclusively and is envisioned to be the conceptual road map for future design professionals to build from.

Introduction1.

2.

3.

4.

5.

6.

7.

8.

9.

10.

11.

12.

Contents

First Street

Second Street

Third Street

Pauli

n

Rock

wood

Heffe

rnan

Herb

er

Mary

Vehicular Land Port of EntryPedestrian Land Port of EntryTransit Center

Calexico, CA

1

Introduction

Methodology

Development

Retreat design concept

Revive design concept

Relight design concept

Streetscape interventions overview

Landscape and materials

Bloom schedule

Phasing

Electrical routing

Next steps

1

2

3

4

8

11

12

13

14

15

17

19

N

Analysis

The first step in the project was to become familiar with downtown Calexico, the Land Port of Entry planned improvements, the tempo-rary re-routing of a large power line associated with the vehicular port of entry construction, and previous planning and improvements projects in and around Calexico. The team researched what was available, including the planning and design documents for the new vehicular and pedestrian ports of entry; GSA, city, and IID maps of existing above and below ground infrastructure, and numerous planning documents. The team also researched redevelopment projects in similarly sized towns in the Southwest. The area of influ-ence was determined to be between Emerson and Mary Avenues, and 1st to 4th Streets.

The initial visioning session with stakeholders (City of Calexico, General Services Administration, Customs and Border Protection, Imperial Irrigation District, Imperial County Transportation Commission, Environmental Protection Agency, Southern California Association of Governments, Economic Development Commission) was an opportunity to present what we learned from our research and what other cities have accomplished through redevelopment. Redevelopment efforts presented included a range of options from streetscape improvements to shared use structures to public/private partnerships. The team also analyzed and summarized the possi-ble options for rerouting the temporary power lines when the Land Port of Entry construction is complete. The temporary line currently extends between Emerson Avenue/4th Street and Mary Avenue at the US border. When the vehicular port of entry is complete, the desire is to underground the temporary power line along any combination of First, Second, and Third Streets and Mary Avenue.

Survey

Following the visioning meeting, the team prepared a short survey that was sent out to the stakeholders and other individuals that have an interest in the project. The survey asked respondents to rank 1 - preferred type of improvement that included streetscape improvements, mixed use project, and adaptive reuse ordinances and 2 - which downtown street should receive improvements. They were also asked how they felt about mixed use in downtown Calexico and the proposed transit center at Third Street and Rockwood. By a small margin, the surveys indicated that streetscape improvements ranked the highest amongst those who responded.

Methodology 1 SURVEY

1 2 3 4 5 6 7

STREETSCAPE IMPROVEMENTS

MIXED USE

DESIGN CONCEPTS

PARKING STRUCUTRE FOR THE PUBLIC

ADAPTIVE REUSE

ORDINANCES

MIXED USE ORDINANCES

SIGNAGE

IMPROVEMENTS

COMBINATION

1 – MOST IMPORTANT 7 – LEAST IMPORTANT PRIORITY

1 2 3 4 5 6 7

FIRST STREET PAULINE TO MARY

SECOND STREET

IMPERIAL TO MARY

THIRD STREET IMPERIAL TO MARY

ROCKWOOD

FIRST TO THIRD

HEFFERNAN FIRST TO THIRD

HERBER

FIRST TO THIRD

OTHER

1 – MOST IMPORTANT 7 – LEAST IMPORTANT LOCATION

2

VEHICULARPORT OF ENTRY

PEDESTRIANPORT OF ENTRY

DOWNTOWNCORE

PARCEL SIZE CONDUCIVE FOR MULTIUSE DEVELOPMENT

VacantVacant

Vacant

RESIDENTIALCalexico ITC Feasibility Study Draft Final Report

Page 41

Figure 18: Final Preferred Site Plan (Alternative 2 with expanded detail)

Transit Center

THIRD ST

FOURTH ST

SECOND ST

FIRST ST

HWY 111

PAU

LIN

AVE

ROCK

WO

OD

AVE

IMPE

RIA

L AV

E

EMER

SON

AVE

HEF

FERN

AN

AVE

HEB

ER S

T

MA

RY A

VE

Area Analysis

Option Development

Based on the survey information, the team developed three streetscape improvement options that included a conceptual design option that could be applied to First, Second, or Third Streets, and two that could be applied to either Second or Third Streets. Option 1 uses curb extension at the corners and midblock to make pedestrian crossings safer and create additional sidewalk space for pe-destrian amenities such as trees and benches. Options 2 and 3 move the angled parking to the center of the street and add a central walking spine, all shaded by either trees in Option 2 or man-made structures in Option 3. The new parking and walkway would be delineated and differentiated using permeable paving that would also help reduce heat gain.

During a workshop in April 2016, the options were presented to the stakeholders, along with the options for undergrounding the overhead power lines. Feedback from the attendees favored Option 1 along First and Third Streets and Option 3 along Second Street. The general feeling regarding Option 2 was there were too many trees proposed for an area that receives so little annual rainfall. The attendees expressed additional concern regarding lighting, particularly along Rockwood, the main north route out of the pedestrian port of entry. In the future, Rockwood will most likely be the main route between the port and the transit center at Third Street.

Final Concept

Based on the workshop feedback, the team developed this booklet. The booklet presents the concept graphically, the palette of mate-rials that could be used, a phasing scenario, and the proposed routes for undergrounding the overhead power. Option 1 concept was named Revive, Option 3 concept was named Retreat, and the lighting improvement concept along Rockwood was named Relight.

Development

3

Concept Sketch

Downtown Calexico is busy, vibrant, and full of people. Most buildings are one or two stories with frontage on the sidewalk and distinctive porticos and arcades covering the sidewalks. The Retreat concept builds on the existing arcades as a place to retreat from the sun, yet still celebrates the abundant natural light. Furthermore, the pedestrian border crossing is located on First Street and is a major source of pedestrian traffic into the center of downtown. Typically people cross the border and walk north on Rockwood, pass-ing First, Second and Third Streets. Second Street is densely populated with a large variety of stores and businesses and therefore it was chosen for the Retreat design concept. Retreat boasts a welcoming, vibrant, distinct, and signature look for Second Street by celebrating rhythmic patterns of dappled light, shade, color, and vegetation.

The Retreat design concept moves the existing angled parking from the curb line to the center of the street. There is a 2-foot xeri-scape planter along the curb lines that includes a combination of smooth stones, desert grasses, and a variety of colorful blooming plants. Eleven-foot travel lanes, angled parking each direction, and a 4-foot pedestrian pathway are located at the center of the street with pathways situated between the parked cars. The pedestrian pathway, mid-block crossing, and corner-block crossings are paved with decorative permeable linear plank paving that relates to the Land Port of Entry paving and establishes safe and convenient pedestrian connections. The center angled parking area is also permeable paving, arranged in a herring bone pattern, to distinguish the parking and pedestrian areas.

Contemporary, colorful, and distinctive structures and trees provide ample shade for parked cars and help decrease solar heat gain in the surrounding paving. The structures’ shade material could be fabric, metal panels, or metal mesh and the supporting structures could take on many forms including cantilevered roofs or fabric stretched between poles. This center parking layout creates a distinc-tive look to the streetscape and has the potential to be closed occasionally in the future for events such as farmers markets or street fairs, with vendor tents located down the vibrantly shaded center of the street.

The Retreat concept integrates flowering desert vines with the shade structure design; pockets of xeriscape in the parking area with smooth stones that relate to the shape of the existing arcades that line the streetscape, and colorful succulents, flowering plants, and agave, which is celebrated in the renovated Land Port of Entry design. Retreat transforms the existing stark streetscape into a lively and vibrant place to shop, relax, meet friends, and enjoy the day.

Retreat

4

Street Plan Plan Detail

Street Section

5

Retreat

Typical Block Plan

Typical Block Elevation

6

Retreat

Center Walkway and Parking

7

Retreat

Midblock Crossing

The Revive design concept is a more minimal intervention then the Retreat design concept in exchange for more flexibility and adapt-ability. While the width of Second Street is able to accommodate parking in the center of the street, First and Third Streets can not because of street width. Furthermore, First Street is adjacent to the pedestrian Land Port of Entry and has one-way traffic while Third Street is adjacent to the site for the new transportation center and is narrow. Revive introduces intermittent projecting curbs and tree planters in addition to a mid-block crossing that reduces the size of the block to a more human scale and produces a traffic calming effect that improves pedestrian safety by increasing pedestrian visibility, shortening crossing distances, slowing turning vehicles, and visually narrowing the roadway.

The Revive design concept alters the sidewalk at the corners and mid-block by extending out the sidewalk depth of the existing park-ing stalls. The mid-block extensions use three parking stalls on each side of the street and are connected by a mid-block crosswalk with decorative paving to match the extensions. The paving for the new mid-block crossing and corner crossing are linear in pattern, also relating to the renovated Land Port of Entry design. The extensions provide room for additional amenities in addition to creating a shorter walking distance for pedestrians and making them more visible to drivers as they wait to cross the street from any store. 75-feet is the most anyone has to walk to use a street crossing.

The sidewalk extensions also provide room for tree planters, pedestrian lighting, benches, trash cans or other site furnishing, and stone and xeriscape planting. The xeriscape design includes smooth stones that relate to the existing arcades that line the streets-cape, colorful succulents, flowering plants, and agave, which are celebrated at the Land Port of Entry. The vegetated curb extensions also contribute to storm water management by capturing storm water and utilizing infiltration and evapotranspiration.

One of the most distinct characteristics of Revive is the rhythmic planting of trees along the block. Once seen as highly problematic for many reasons, street trees are proving to be a great value to people living, working, shopping, sharing, walking and motoring in and through urban places. Not only do trees bring life and beauty the street, but they also positively affect the microclimate by providing filtered shade and a cooling effect from natural transpiration. In the wintertime, deciduous trees that are low-water-use and native to the desert such as Palo Verdes, Ironwoods, and Texas Mountain Laurel lose their leaves and allow more sunlight to pass through their canopy. Ultimately, Revive brings life, beauty, and safety to existing downtown Calexico streets with minimal intervention.

Revive

8

Street Plan Plan Detail

Street Section

9

Revive

Typical Block Plan

Typical Block Elevation

10

Revive

Cornerblock Crossing

The Relight design concept includes installing pedestrian wall-mounted lighting and roadway lighting along Rockwood, between First and Third Streets. Rockwood is the main north-south route that pedestrians use after crossing the Land Port of Entry. Currently this portion of Rockwood is very dimly lit at night, with only two street lights along the entire stretch of the street. The recommended lighting for the area is 1 pole per 150-feet, rendering the existing lighting as inadequate.

Existing wall mounted lighting is sparse and varies in fixture type and style. Sidewalks are inconsistently lit by ambient light emanating from stores and fluorescent lights that are mounted to the underside of the arcades that are also not maintained by the city. These issues are critical for a heavy traffic and pedestrian street, like Rockwood, because street lighting is a key streetscape element that defines the quality of the nighttime visual environment and safety in urban areas. The quality of visual information is critical for both traffic safety and pedestrian safety and security. Relight provides lighting that is designed not only for vehicular traffic on the road-ways, but also for parking and pedestrians on sidewalks and paths.

Similar to the rest of the Calexico downtown area, the arcades and porticos that line Rockwood extend to the sidewalk, leaving only a few locations for street lights. Relight provides two street light poles at every intersection and one mid-block, at the alley. Each pole has two lights - one that illuminates the street and one that illuminates the sidewalk. Various lights, signs, banners, and other decora-tive items can be mounted to the poles, defining the visual characteristic of the downtown area during daylight hours.

The Relight concept provides eight wall-mounted lights per each block on Rockwood to illuminate the pedestrian sidewalk and dramatically accent wall surfaces. These types of lights are mounted very close to the plane of the wall and the light projects obliquely across surface as a high-intensity light with a relatively narrow beam angle. The wall grazing fixtures are intended to reveal the tex-ture, shape, and character of the wall along Rockwood while providing visual interest and rhythm as cars and pedestrians travel along the street.

Today street lighting commonly uses high-intensity discharge lamps, often high pressure sodium lamps (HPS). Such lamps provide the greatest amount of illumination for the least consumption of electricity. New street lighting technologies, such as induction or LED lights, emit a white light that provides high levels of lumens and allows street lights with even lower wattages. Relight fixtures could either be HPS or LED. It is recommended to use HPS if the existing fixtures will be maintained and LED if the existing fixtures will be replaced.

Relight

11

Street Section

Typical Block Plan

Transit Center

Pedestrian Land Port of Entry

Vehicular Land Port of Entry

Second Street

Third Street

Roc

kwoo

d

Streetscape Interventions Overview

The overall streetscape intervention intent is to create a vision for improving the public spaces and city streets beyond the Land Port of Entry using the Retreat, Revive, and Relight design concepts and to connect the businesses of downtown Calexico with the new and expanded public transportation opportunities. Retreat is applied to Second Street between Imperial and Mary to activate the main shopping area of downtown. Revive is applied to First and Third Streets because they have space and traffic challenges and construction conflicts with the Land Port of Entry renovation and transit center happening adjacent to them. Relight is applied to Rockwood, the main north-south street that connects the Land Port of Entry and new transportation center.

First Street

12

The inspiration for the landscape design for downtown Calexico takes its inspiration from the natural surrounding desert in combination with the desire to create a welcoming and vibrant space for residents and visitors. The current streetscape is severe, with minimal vegetation and wide swaths of pavement that can encourage fast driving. The climate is hot and dry, which is why many of the sidewalks are shaded by arcades and porticos that project from the building facades.

Among the Retreat and Revive design concepts, shade is proposed as either trees, man-made structures, or both. Several desert tree options include Palo Verdes, Ironwoods, and Texas Mountain Laurel. These desert trees can survive on minimal water and provide filtered shade and a cooling effect from their natural transpiration. They periodically go deciduous in the winter when more sunlight is desired, and would require fairly frequent maintenance.

Shade structures lack the natural ambiance of plants, but also require less maintenance and offer consistent year-round shade coverage while providing the opportunity to introduce large swaths of vibrant color in to the streetscape. The presence of shade structures is also softened by incorporating flowering vines such as Bougainvillea and Queen’s Wreath. The shade panels could be fabric, metal mesh, or solid metal, each material offering a different look and feel along with varying densities of shade. The proposed palette of shrubs for the streetscape would also be low-water-use native and desert-adapted plants. There are many to select from that would offer an interesting variety of sizes, textures, and blooming colors and times.

Any vegetation would need to be irrigated with a drip system. While low-water-using, desert plants can not survive on only the small amount of precipitation that falls within their planter. A drip system is the most efficient way of getting the most water to the plants and not losing it to evaporation along the way. In conjunction with moisture sensors, rain gauges, and similar equipment, the drip system can be tightly operated to only irrigate when the plants need it the most.

Paving materials for crosswalks, pedestrian walkways, and parking stalls are permeable to help reduce heat gain with the added benefit of decreasing run-off into the storm drain system. There are contrasting materials to demarcate the pedestrian zones from the automobile zones. Planters are finished off with a rock material that provides a subtle accent and also offers dust control.

Site furnishings, including benches, trash cans, and information kiosks, provide the streetscape with an outdoor room appeal. Frequently located benches and bench groupings provide the opportunity for people pause and visit; information kiosks could share news about upcoming events and sales.

Lighting another crucial streetscape element. Lighting fixtures create a strong vertical rhythm down the street during the day and a welcom-ing glow during the night. Area street lights, pedestrian scale pole lights, wall sconces, and tree up and down lights are all part of the lighting palette.

Landscape and Materials

Palo Verde

Texas Mountain Laurel

Queen’s Wreath

Baja Passion Vine

Gopher Plant

Dawe’s Aloe Penstemon

Yarrow

Cosmo

Fabric

Weathering steel

Painted steel

Powder coated steel

Permeable plank paving

Smooth rocks

Permeable herring bone paving

13

Blackfoot Daisy

Mexican Sunflower

Verbena

Chaparral Sage

Zinnia

Modular bench seating

Wall mounted lighting

Pedestrian lighting

Wall mounted lighting

Trash receptacle

october

september

august

july

june

may

april

march

february

january

december

november

baja

pas

sion

vin

e

yarr

ow

verb

ena

daw

e’s

aloe

chap

arra

l sag

e

pens

tem

on

mex

ican

sun

flow

er

zinn

ia

cosm

o

blue

pal

o ve

rde

blac

kfoo

t dai

sy

shru

bs

vine

s

succ

ulen

ts

trees

quee

n’s

wre

ath

goph

er p

lant

tx m

ount

ain

laur

el

Bloom Schedule

Both the Retreat and Revive design concepts use vegetation to add color and vibrancy to the streetscape. Desert adaptive plants that are capa-ble of surviving in full-sun exposure and with minimal water requirements, can be planted according to a bloom schedule. The bloom schedule generates a palette of vegetation that disperses color vibrancy year-round by identifying when plants are in full bloom. With the proper selection, color can be present in every season and provide a dynamic liveliness to downtown Calexico.

14

Second Street

Third Street

Roc

kwoo

d

Paul

in

Impe

rial

Hef

fern

an

Her

ber

Mar

y

First Street

Phasing Overview

Phasing is suggested for this project for both funding feasibility and construction sequencing. The overall phasing of the project makes the improvements applied to the central area of Second Street, between Paulin and Heffernan, and Rockwood the first priority (1A). This area is at the core of downtown and has substantial pedestrian and vehicular traffic. Improving these streets strengthens the central downtown character while connecting travelers to and from the Land Port of Entry to the new transit center on 3rd and Rockwood. The next priority is Third Street and First Street (2, 3A, 3B), respectively, which improves the street design quality adjacent to the Land Port of Entry and Transit Center. The final priority expands upon the earlier phases’ success by extending the improvements on Second Street to Imperial and to Mary and extending the improvements on Third Street to Imperial (4).

15

3

Phase 1

Phase 3

Phase 1 includes 1A and 1B. 1A includes applying the Relight design concept to Rockwood between First and Third Street. The street lights on the southwest corner of First Street and Rockwood and also the intersection of Third Street and Rockwood are not a part of this phase because the curb improvements at those intersections will be installed at later phases. There are two existing fixtures at those intersections that should produce sufficient street light until they can be replaced. 1A also includes applying the Retreat design concept to Second Street between Paulin and Heffernan. 1B includes extending Retreat on Second Street to Mary. 1B can also occur during Phase 4 if funding is not immediately available.

Phase 3 includes applying the Revive design concept to First Street between Rockwood and Heffernan and an additional planter on First Street just west of Rockwood. Curb improvements will only happen on the northeast side of the intersection of First Street and Rockwood and one new street light will be installed on the northeast corner. Parallel parking on the south side of First Street will remain because the width of the street does not accommodate angled parking.

44

4

Phase 2

Phase 4

Phase 2 includes applying the Revive design concept to Third Street between Paulin and Heffernan. The existing street light at the intersection of Third Street and Rockwood will be removed and two new street lights will be installed at that location according to the Relight design concept. Parallel parking at south side of Third Street will remain because the street width will not accommodate angled parking.

Phase 4 is the phase that completes the downtown intervention and it includes extending the Revive design concept on Third Street to Imperial and extending the Retreat design concept on Second Street west to Imperial and east Mary. If Phase 2A was not completed after 1A, it would happen in this phase.

Second Street

Third Street

First Street

Roc

kwoo

d

Paul

in

Impe

rial

Hef

fern

an

Her

ber

Mar

y

2

Second Street

Third Street

First Street

Roc

kwoo

d

Paul

in

Impe

rial

Hef

fern

an

Her

ber

Mar

y

Second Street

Third Street

First Street

Roc

kwoo

d

Paul

in

Impe

rial

Hef

fern

an

Her

ber

Mar

y

Second Street

Third Street

First Street

Roc

kwoo

d

Paul

in

Impe

rial

Hef

fern

an

Her

ber

Mar

y

PHASE 2 COST ESTIMATE:900 LF @ $1,900/LF = $1,710,000

PHASE 4 COST ESTIMATE:Second Street: 650 LF @ $4,450/LF = $2,890,900 Third Street: 280 LF @ $1,900 = $532,200 Total = $3,423,100

PHASE 3 COST ESTIMATE:First Street: 470 LF @ $1,900/LF = $890,000

PHASE 1 COST ESTIMATE:Second Street 1A: 900 LF @ $4,450/LF = $4,005,000Second Street 1B: 420 LF @ $4,450/LF = $1,870,000 Rockwood: 640 LF @ $500/LF = $320,000 Total = $6,195,000

16

Electrical RoutingThe construction at the Land Port of Entry in addition to new transportation infrastructure has initiated the desire to convert two 12.47 kV medium voltage circuits from overhead to underground. This conversion will also enhance the proposed urban planning develop-ment project for the city of Calexico. The owner of these two lines is Imperial Irrigation District (IID), and three proposed line routes must be reviewed to determine the feasibility of each proposed installation.

The recommended trench locations within the streets are transposed on a street plan drawing of downtown Calexico in order to re-view the feasibility of each proposed line route with other existing utility installations along the selected street route’s right of way. The streets selected for the underground lines installation were First Street, Second Street and Third Street. The overhead to underground lines conversion would occur between just west of the intersection of Emerson and Third Street and south of the intersection of Mary and First Street.

There is room within each of the three proposed streets to install a 30 inch wide trench that will have 6 – 6 inch PVC conduit designed three across X two down. The bottom three rows of conduits will have installed two circuits of medium voltage jacketed 750 kcmil Al conductor XLPE cable. The top row of conduits within this proposed trench will be spare conduits.

The current trench length for each proposed line route is as follow:

First Street: 2840 LFSecond Street: 2980 LFThird Street: 3300 LF

The suggested route for the underground lines installation will be along First Street, since it would be the most economical in regards to its trench length.

The location of the steel transition poles at each end of this proposed underground lines installation has not been finalized and the next steps that will need to be addressed are as follows to finalize the underground design:

• IID will need to determine the steel pole locations at each ends of the overhead to underground line routes. There will be two steel poles (transition poles) at each end so that each single circuit will have its own transition pole to prevent a double contin-gency outage.

• IID will need to determine the location of their main switchgears or switching cabinets at each end of the transition pole locations. They are requesting two main switchgears located at each end of the underground line installation with an automatic transfer switch. The switchgears will be designed to operate remotely back at their operation center. The preferred IID choice would be to use ADSS fiber optic cables to operate the main switchgear switches. The operating sequence needs to be addressed.

• IID will need to determine if they would like fiber optics conduits and cables within the same trench with the medium voltage cables. Also a determination must be made whether the fiber optics cable and splices will be installed within the same traffic bearing manholes that will contain the medium voltage cables and splices.

• IID will need to determine the spacing and location of the traffic bearing manholes. T-splices will be installed in each of the traffic bearing manholes.

• IID will need to provide the overhead line design for dead ending the overhead lines on the transition poles. Also the cover design for the medium voltage cables going up the transition pole.

The City of Calexico will require drawings and approval to issue a city permit that will allow the underground lines installation design within their public streets.

Medium Voltage Trench Section

17

Electrical Diagram Legend

18

This conceptual design booklet is the result of the collaborative efforts of GSA, stakeholders, planners and the community. It provides a conceptual vision to transform downtown Calexico into a lively center of economic growth. Retreat, Revive, and Relight are design concepts that are intended to communicate first-impression intervention models that reflect the initial thoughts and opinions of the community. The UGE diagrams illustrated in this booklet are also conceptual suggested routes. Full design will need to follow a new utility survey of the area and be coordinated with the renovations of the Land Port of Entry and IID.

This booklet aims to provide three viable concept designs and three possible UGE routing paths that are responsive of the community, Land Port of Entry renovations, and enhanced transportation infrastructure. It is intended to be used as a tool for grant award purpos-es exclusively to demonstrate streetscape design feasibility and UGE routing coordination for downtown Calexico. After the project is awarded, future design professionals should continue to build upon relationships with stakeholders and the community to insure quality design and the long term success of Calexico.

Next StepsAnthony Kleppe, GSADavid Hinojosa, GSADavid Leites, GSAJavier Fernandez, GSAJean Dakota, GSAJohn Spahr, GSAJoong Kim, City of CalexicoLily Falomir, City of CalexicoRalph Morales, City of CalexicoRobert Ortiz, City of CalexicoBrad Zerwas, CBPDavid Salazar, CBPMary Bowers, CBPAlfred Ornelas, IID

ContributorsDonald Vargas, IIDIgnacia Romo, IIDJavier Meza, IIDRandy Gray, IID Rick M. Torres, IIDMark Baza, ICTCVirginia Mendoza, ICTCDave Fege, EPAScott Stollman, EPAAlan Thompson, SCAG, Transportation Michael Morris, Dept. of TransportationBen Horton, EDC CCXDaniel Romero, CCMDuane Coon, Jacobs

GSA - General Services AdministrationCBP – Customs and Border ProtectionIID - Imperial Irrigation District ICTC - Imperial County Transportation CommissionEPA - Environmental Protection AgencySCAG – Southern California Association of GovernmentsEDC - Economic Development Commission KMA/HDR - Architect

19

Amineh Warrayat, KMA/HDRDon Blair, KMA/HDRKate Diamond, KMA/HDRLaura Paty, KMA/HDRSara Qafisheh, KMA/HDRTed Nishioka, KMA/HDRTom Perica, KMA/HDR