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Porous Pavement and Model Municipal Operations Center

Demonstration Project Phase II

Photo Document Project

County of San DiegoDEPARTMENT OF GENERAL

SERVICESAugust 1, 2008

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Order of Review• Overview of Phase I Results• Treatment Train

• Site Preparation• Construction• Post Construction

• Porous Pavement• Site Preparation• Construction• Post Construction• Rain Event

• Results to Date

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Overview of Phase I

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M12A

Porous Concrete

14,936 s.f.Porous Asphalt

40,126 s.f.

Pavers

7,896 s.f.

Reference Area.

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Porous Pavement Center COC 62,958 s.f.

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Cost Summary – Porous Pavement7

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PHASE I PAVEMENT REPLACEMENT SQUARE FOOT COSTS

  Demolition &

Excavation Installation of Sub Base

Pavement Costs

Square Foot Costs*

Annual Est. Square Foot Maintenance

Costs Comments

Porous Asphalt $ 2.75 $ 1.88

$ 1.87

$ 6.50

$ 0.04

18" excavation/backfill. 3" porous asphalt.

Standard Asphalt $ 2.13 $ 1.04

$ 1.32

$ 4.49

$ 0.06

6"-Excavation/Backfill. 6"-Asphalt.

Porous Concrete $ 3.19 $ 1.88

$ 6.34

$ 11.41

$ 0.02

18"-Excavation/Backfill. 5-1/2" pervious concrete.

Standard Concrete $ 1.51

$ -

$ 3.42

$ 4.93

$ 0.01

No new base material. 6"-Reinforced Concrete

Porous Pavers $ 2.75 $ 1.88

$ 9.63

$ 14.26 TBD

18"-Excavation/Backfill. 3"-Paver.

*Square foot cost are based on actual cost received by the County of San Diego.

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Phase I Treatment Train Schematic

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Targeted Pollutants of Concern

•Suspended Solids

• Oil/Grease

• Metals (Copper, Zinc, Chromium, Cadmium)

• Organics

• NitrogenNote: These are consistent between Phase I and Phase II.

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Phase II

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10Current and Proposed Porous Pavement and Treatment Train Locations

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Phase II Expansion

• Three additional media filtration units• Three additional porous paving test plots (54,000 sf)

• One additional porous concrete test plot• Two additional porous asphalt test plots• Geogrid stabilization under 1/2 of each new porous asphalt test plot• 26,000 sf of roof runoff diverted to porous asphalt test beds

• Enhanced monitoring to evaluate current/expanded BMP effectiveness

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12Phase II Treatment Train Schematic

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PHASE 2 PAVEMENT

REPLACEMENT SQUARE FOOT

COSTS

18"-30" excavation/backfill. 3" porous asphalt.Porous Asphalt 3.39$ 3.40$ 2.01$ 8.80$ 0.04$

Standard Asphalt 2.13$ 1.04$ 1.32$ 4.49$ 0.06$

Porous Concrete 3.64$ 3.40$ 7.10$ 14.14$ 0.02$

Standard Concrete 1.51$ -$ 3.42$ 4.93$ 0.01$

18"-30" excavation/backfill. 3" porous asphalt.

6"-Excavation/Backfill. 6"-Asphalt.

18"-30" Excavation/Backfill. 5-1/2" pervious concrete.

No new base material. 6"-Reinforced Concrete

PHASE 1 PAVEMENT

REPLACEMENT SQUARE FOOT

COSTS

18"-Excavation/Backfill. 3"-PaverPorous Asphalt 2.75$ 1.88$ 1.87$ 6.50$ 0.02$

Porous Concrete 3.19$ 1.88$ 6.34$ 11.41$ 0.04$

18"-Excavation/Backfill. 3"-Paver

*Square foot cost are based on actual cost received by the County of San Diego.

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TREATMENT TRAIN

Site Preparation14

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TREATMENT TRAIN

Site Preparation and Excavation

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TREATMENT TRAIN

Excavation Around Phase 1 Treatment Train

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TREATMENT TRAIN

CONSTRUCTION

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TREATMENT TRAIN

Installation of MFS and Storm Filter Chambers

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TREATMENT TRAIN

Installation of MFS and Storm Filter Chambers

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TREATMENT TRAIN

Installation of Diversion Pipe and Monitoring Boxes

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TREATMENT TRAIN

Backfilling Treatment Train

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TREATMENT TRAIN

Maintenance

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TREATMENT TRAIN

CONSTRUCTION

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TREATMENT TRAIN

MSF Unit Replacement Filter

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TREATMENT TRAIN

Filter Replacement of Phase 1 MSF Unit

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CDS PRE-TREATMENT CLEAN-OUT

After Three Rain Events33

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POROUS PAVEMENT

Site Preparation

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POROUS PAVEMENT

Excavation Engraving

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POROUS PAVEMENT

CONSTRUCTION

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POROUS PAVEMENT

Installation of Subsurface Overflow Drainage and Monitoring System

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POROUS PAVEMENT

CONSTRUCTION

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POROUS ASPHALT PROFILE 41

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POROUS PAVEMENT

Installation of Geotech Style Fabric and Aggregate

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POROUS PAVEMENT

Installation of Geogrip Re-enforcement

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POROUS PAVEMENT

Porous Asphalt Overlain Aggregate Bed

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POROUS PAVEMENT

Installation of Porous Asphalt

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POROUS ASPHALT PROFILE

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POROUS PAVEMENT

Installation of Porous Concrete

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POROUS PAVEMENT

Porous Concert Curing Process

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POROUS PAVEMENT

POST CONSTRUCTION

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POROUS PAVEMENT

Asphalt concrete Interface

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POROUS PAVEMENT

POST-CONSTRUCTION

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POROUS PAVEMENT

Porous Concrete Infiltration

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POROUS PAVEMENT

Porous Asphalt Infiltration

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POROUS PAVEMENT

Rain EventNovember 30, 2007

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POROUS PAVEMENT

RAIN EVENT (11/30/2007)

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POROUS PAVEMENT

RAIN EVENT (11/30/2007)

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POROUS PAVEMENT

RAIN EVENT (11/30/2007)

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POROUS PAVEMENT

RAIN EVENT (11/30/2007)

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Results to Date

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Porous Paving Treatments

• Rainfall and Runoff measured during 11 events during the 2005-2006 wet season.

• Events ranged from 0.23 inches to 1.07 inches during Phase I monitoring.

• All Three Porous Paving Treatments eliminated 100 percent of the runoff and associated contaminants.

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Infiltration Works!Porous Asphalt

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Infil

trat

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Bas

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ater

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Rai

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Infiltration Basin Water Level

Rainfall Intensity

OVERFLOW LEVEL

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MFS Performance (Phase I)• Perlite used as Media• Initial data based upon only 3 events• Effective at further removal of sediment

• Coarse sediments (>63 µ) to <1.8 mg/L.• Fine sediments (<63 µ) to <14 mg/L

• Effective at further removal of contaminants strongly associated with particulate contaminants• e.g. Total Lead concentrations reduced 27-60

percent

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