1

Porous Pavement and Model Municipal Operations Center

Demonstration Project Phase II

Photo Document Project

County of San DiegoDEPARTMENT OF GENERAL

SERVICESAugust 1, 2008

1

2

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

2

3

Overview of Phase I

3

4

N

11

M12A

Porous Concrete

14,936 s.f.Porous Asphalt

40,126 s.f.

Pavers

7,896 s.f.

Reference Area.

7

Porous Pavement Center COC 62,958 s.f.

4

5

Cost Summary – Porous Pavement7

6

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.

8

7

Phase I Treatment Train Schematic

5

8

Targeted Pollutants of Concern

•Suspended Solids

• Oil/Grease

• Metals (Copper, Zinc, Chromium, Cadmium)

• Organics

• Nitrogen

Note: These are consistent between Phase I and Phase II.

6

9

Phase II

9

10Current and Proposed Porous Pavement and Treatment Train Locations

10

11

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

11

12Phase II Treatment Train Schematic

12

13

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.

13

14

TREATMENT TRAIN

Site Preparation14

15

TREATMENT TRAIN

Site Preparation and Excavation

15

16

TREATMENT TRAIN

Excavation Around Phase 1 Treatment Train

16

17

TREATMENT TRAIN

CONSTRUCTION

17

18

TREATMENT TRAIN

Installation of MFS and Storm Filter Chambers

20

19

TREATMENT TRAIN

Installation of MFS and Storm Filter Chambers

21

20

TREATMENT TRAIN

Installation of Diversion Pipe and Monitoring Boxes

26

21

TREATMENT TRAIN

Backfilling Treatment Train

28

22

TREATMENT TRAIN

Maintenance

30

23

TREATMENT TRAIN

CONSTRUCTION

29

24

TREATMENT TRAIN

MSF Unit Replacement Filter

31

25

TREATMENT TRAIN

Filter Replacement of Phase 1 MSF Unit

32

26

CDS PRE-TREATMENT CLEAN-OUT

After Three Rain Events33

27

POROUS PAVEMENT

Site Preparation

34

28

POROUS PAVEMENT

Excavation Engraving

35

29

POROUS PAVEMENT

CONSTRUCTION

37

30

POROUS PAVEMENT

Installation of Subsurface Overflow Drainage and Monitoring System

38

31

POROUS PAVEMENT

CONSTRUCTION

39

32

POROUS ASPHALT PROFILE 41

33

POROUS PAVEMENT

Installation of Geotech Style Fabric and Aggregate

44

34

POROUS PAVEMENT

Installation of Geogrip Re-enforcement

45

35

POROUS PAVEMENT

Porous Asphalt Overlain Aggregate Bed

52

36

POROUS PAVEMENT

Installation of Porous Asphalt

50

37

POROUS ASPHALT PROFILE

46

38

POROUS PAVEMENT

Installation of Porous Concrete

47

39

POROUS PAVEMENT

Porous Concert Curing Process

48

40

POROUS PAVEMENT

POST CONSTRUCTION

54

41

POROUS PAVEMENT

Asphalt concrete Interface

55

42

POROUS PAVEMENT

POST-CONSTRUCTION

56

43

POROUS PAVEMENT

Porous Concrete Infiltration

57

44

POROUS PAVEMENT

Porous Asphalt Infiltration

58

45

POROUS PAVEMENT

Rain EventNovember 30, 2007

59

46

POROUS PAVEMENT

RAIN EVENT (11/30/2007)

60

47

POROUS PAVEMENT

RAIN EVENT (11/30/2007)

61

48

POROUS PAVEMENT

RAIN EVENT (11/30/2007)

62

49

POROUS PAVEMENT

RAIN EVENT (11/30/2007)

63

50

Results to Date

64

51

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.

65

52

Infiltration Works!Porous Asphalt

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Infil

trat

ion

Bas

in W

ater

Lev

el (f

t)

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Rai

nfal

l Int

ensi

ty (I

nche

s/ho

ur)

Infiltration Basin Water Level

Rainfall Intensity

OVERFLOW LEVEL

66

53

67

54

68

55

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

69

56

70