Porous Pavement and Model Municipal Operations Center Demonstration

Porous Pavement and Model Municipal Operations Center Demonstration Project Phase II Photo Document Project 1 County of San Diego DEPARTMENT OF GENERAL SERVICES August 1, 2008 1

Order of Review Overview of Phase I Results • Treatment Train • Site Preparation • Construction • Post Construction • 2 • Porous Pavement Site Preparation • Construction • Post Construction • Rain Event • • Results to Date 2

Overview of Phase I 3 3

N 7 Porous Concrete Pavers 7, 896 s. f. Porous Asphalt 14, 936 s. f. 40, 126 s. f. Reference Area. M 12 A 4 11 Porous Pavement Center COC 62, 958 s. f. 4

Cost Summary – Porous Pavement 7 5

PHASE I PAVEMENT REPLACEMENT SQUARE FOOT COSTS Porous Asphalt Standard Asphalt 8 Porous Concrete Demolition & Excavation $ 2. 75 $ 2. 13 $ 3. 19 Installatio n of Sub Base $ 1. 88 $ 1. 04 $ 1. 88 Square Foot Costs* Paveme nt Costs $ 1. 87 $ 1. 32 $ 6. 34 $ 6. 50 $ 4. 49 $ 11. 41 Standard Concrete $ 1. 51 $ - $ 3. 42 $ 4. 93 Porous Pavers $ 2. 75 $ 1. 88 $ 9. 63 $ 14. 26 Annual Est. Square Foot Maintenanc e Costs Comments 18" $ excavation/backfill. 0. 04 3" porous asphalt. $ 0. 06 6"Excavation/Backfill. 6"-Asphalt. $ 0. 02 18"Excavation/Backfill. 5 -1/2" pervious concrete. $ 0. 01 No new base material. 6"Reinforced Concrete TBD 18"Excavation/Backfill. 3"-Paver. *Square foot cost are based on actual cost received by the County of San Diego. 6

5 Phase I Treatment Train Schematic 7

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 8

Phase II 9 9

10 Current and Proposed Porous Pavement and Treatment Train Locations 10

Phase II Expansion • • Three additional media filtration units Three additional porous paving test plots (54, 000 sf) • • 11 • • • 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

12 Phase II Treatment Train Schematic 12

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TREATMENT TRAIN Site Preparation 14 14

TREATMENT TRAIN 15 Site Preparation and Excavation 15

TREATMENT TRAIN 16 Excavation Around Phase 1 Treatment Train 16

TREATMENT TRAIN CONSTRUCTION 17 17

TREATMENT TRAIN 20 Installation of MFS and Storm Filter Chambers 18

TREATMENT TRAIN 21 Installation of MFS and Storm Filter Chambers 19

TREATMENT TRAIN 26 Installation of Diversion Pipe and Monitoring Boxes 20

TREATMENT TRAIN 28 Backfilling Treatment Train 21

TREATMENT TRAIN Maintenance 30 22

TREATMENT TRAIN 29 23 CONSTRUCTION

TREATMENT TRAIN 31 MSF Unit Replacement Filter 24

TREATMENT TRAIN 32 Filter Replacement of Phase 1 MSF Unit 25

CDS PRE-TREATMENT CLEAN-OUT 33 After Three Rain Events 26

POROUS PAVEMENT Site Preparation 34 27

POROUS PAVEMENT 35 Excavation Engraving 28

POROUS PAVEMENT CONSTRUCTION 37 29

POROUS PAVEMENT 38 Installation of Subsurface Overflow Drainage and 30

POROUS PAVEMENT 39 CONSTRUCTION 31

POROUS ASPHALT PROFILE 41 32

POROUS PAVEMENT 44 Installation of Geotech Style Fabric and Aggregate 33

POROUS PAVEMENT 45 Installation of Geogrip Re-enforcement 34

POROUS PAVEMENT 52 Porous Asphalt Overlain Aggregate Bed 35

POROUS PAVEMENT 50 Installation of Porous Asphalt 36

POROUS ASPHALT PROFILE 46 37

POROUS PAVEMENT 47 Installation of Porous Concrete 38

POROUS PAVEMENT Porous Concert Curing Process 48 39

POROUS PAVEMENT POST CONSTRUCTION 54 40

POROUS PAVEMENT 55 Asphalt concrete Interface 41

POROUS PAVEMENT 56 42 POST-CONSTRUCTION

POROUS PAVEMENT 57 Porous Concrete Infiltration 43

POROUS PAVEMENT Porous Asphalt Infiltration 58 44

POROUS PAVEMENT Rain Event November 30, 2007 59 45

POROUS PAVEMENT 60 RAIN EVENT (11/30/2007) 46

POROUS PAVEMENT 61 RAIN EVENT (11/30/2007) 47

POROUS PAVEMENT 62 RAIN EVENT (11/30/2007) 48

POROUS PAVEMENT 63 RAIN EVENT (11/30/2007) 49

64 Results to Date 50

Porous Paving Treatments • • • 65 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. 51

Infiltration Works! 66 52

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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 • • • 69 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 55

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