Opinion of Probable Cost

Appendix E Opinion of Probable Cost 01054/8410233/14/Rohner_Alt_Analysis_Report Rohner Creek Flood Control, Habitat and Seismic Improvement Project Alternatives Analysis

Cost Alternative 1: Improved Channel 10 year flow Main St to Beech St Beech St to Alder Drive Alder Drive to Forbusco Vehicle Bridge Hillside 12 th Street Crossing

Alternative 2: New Rohner Creek Alignment 100 year flow Main St to Beech St New Channel 12 th Street Crossing Hillside Lower Floodplain

Alternative 3: Improved Channel with Field Bypass Culvert 100 year flow Main St to Beech St I. Field Bypass Beech St to Alder Drive 12 th Street Crossing Hillside Alder Drive to Forbusco Vehicle Bridge Upper and Lower Floodplain

Alternative 4: Improved Channel with Fortuna Blvd Bypass Culvert 100 year flow Main St to Beech St Fortuna Bypass Beech St to Alder Drive Alder Drive to Forbusco Vehicle Bridge 12 th Street Crossing Hillside Forbusco Vehicle Bridge to Floodplain Terrace A Upper and Lower Floodplain

Rohner Creek Flood Control and Habitat Improvements 5/30/2013 15:11 City of Fortuna, California Opinion of Probable Construction Cost Based on 10% Plans Alternative 1 Cost Alternative 2 Cost Mobilization/Demobilization (5% of subtotal) $ 255,000 Mobilization/Demobilization (5% of subtotal) $ 256,000 Water Management $ 150,000 Water Management $ 100,000 Temp Signage, Public Notification, Temp Fencing $ 10,000 Temp Signage, Public Notification, Temp Fencing $ 10,000 Traffic Control $ 30,000 Traffic Control $ 20,000 Erosion/Sediment Control $ 100,000 Erosion/Sediment Control $ 100,000 Subsection Subtotals: Subsection Subtotals: A. Main St Crossing to Beech St Crossing Subtotal $ 459,230 A. Main St Crossing to Beech St Crossing Subtotal $ 459,230 B. Beech St Crossing to Alder Drive Crossing Subtotal $ 1,039,740 H. New Channel Alignment Subtotal $ 2,490,570 C. Alder Drive Crossing to Forbusco Vehicle Bridge Subtotal $ 2,234,700 F. Lower Floodplain Subtotal $ 856,560 G. Hillside Creek Improvements Subtotal $ 814,000 G. Hillside Creek Improvements Subtotal $ 814,000 K. 12th Steet Crossing Subtotal $ 250,000 K. 12th Steet Crossing Subtotal $ 250,000 Subtotal $ 5,342,670 Subtotal $ 5,356,360 Total Alternative 1, less 15% = $ 4,541,270 Total Alternative 2, less 15% = $ 4,552,906 Total Alternative 1, plus 30% = $ 6,945,471 Total Alternative 2, plus 30% = $ 6,963,268 Alternative 3 Cost Alternative 4 Cost Mobilization/Demobilization (5% of subtotal) $ 534,000 Mobilization/Demobilization (5% of subtotal) $ 638,000 Water Management $ 150,000 Water Management $ 150,000 Temp Signage, Public Notification, Temp Fencing $ 10,000 Temp Signage, Public Notification, Temp Fencing $ 10,000 Traffic Control $ 20,000 Traffic Control $ 60,000 Erosion/Sediment Control $ 100,000 Erosion/Sediment Control $ 100,000 Subsection Subtotals: Subsection Subtotals: A. Main St Crossing to Beech St Crossing Subtotal $ 459,230 A. Main St Crossing to Beech St Crossing Subtotal $ 459,230 B. Beech St Crossing to Alder Drive Crossing Subtotal $ 1,039,740 B. Beech St Crossing to Alder Drive Crossing Subtotal $ 1,039,740 C. Alder Drive Crossing to Forbusco Vehicle Bridge Subtotal $ 2,234,700 C. Alder Drive Crossing to Forbusco Vehicle Bridge Subtotal $ 2,234,700 E. Upper Floodplain Subtotal $ 576,420 D. Forbusco Vehicle Bridge to Upper Floodplain $ 718,880 F. Lower Floodplain Subtotal $ 856,560 E. Upper Floodplain Subtotal $ 576,420 G. Hillside Creek Improvements Subtotal $ 814,000 F. Lower Floodplain Subtotal $ 856,560 I. Field Bypass Weir, Culvert and Alcove Subtotal $ 4,163,200 G. Hillside Creek Improvements Subtotal $ 814,000 K. 12th Steet Crossing Subtotal $ 250,000 J. Fortuna Boulevard Bypass Weir and Culvert Subtotal $ 5,722,210 K. 12th Steet Crossing Subtotal $ 250,000 Subtotal $ 11,207,850 Subtotal $ 13,379,740 Total Alternative 3, less 15% = $ 9,526,673 Total Alternative 4, less 15% = $ 11,372,779 Total Alternative 3, plus 30% = $ 14,570,205 Total Alternative 4, plus 30% = $ 17,393,662

Rohner Creek Flood Control and Habitat Improvements 5/30/2013 15:11 City of Fortuna, California Opinion of Probable Construction Cost Based on 10% Plans Subsection Subtotals Item No. Item Description Quantity Unit Unit Cost Cost A. Main St to Beech St Crossing 1 Excavation & Disposal, creek locations 6,500 CY $ 30 $ 195,000 2 Engineered Streambed Material 450 CY $ 100 $ 45,000 3 Rock Grade Control Structures 4 EA $ 6,000 $ 24,000 4 Log Habitat Structures 3 EA $ 5,000 $ 15,000 5 Rock Slope Protection 112 TONS $ 160 $ 17,920 6 Riparian Planting 3,810 SQ.YD. $ 4 $ 15,240 7 Biodegradable Fabric (COIR) 1,130 SQ.YD. $ 9 $ 10,170 8 Concrete Bridge Foundation, 12 ft wide 1 EA $ 25,000 $ 25,000 9 Bridge, Precast Prestressed, 12 ft wide, delivered 34 LF $ 1,000 $ 34,000 10 Bridge Demolition & Installation 1 EA $ 40,000 $ 40,000 11 Bridge Guardrails 68 LF $ 175 $ 11,900 12 Preservation of Property 1 LS $ 26,000 $ 26,000 A. Main St Crossing to Beech St Crossing Subtotal $ 459,230 B. Beech St Crossing to Alder Drive Crossing 1 Excavation & Disposal, creek locations 6,500 CY $ 30 $ 195,000 2 Engineered Streambed Material 550 CY $ 100 $ 55,000 3 Rock Grade Control Structures 5 EA $ 6,000 $ 30,000 4 Log Habitat Structures 5 EA $ 5,000 $ 25,000 5 Rock Slope Protection 154 TONS $ 160 $ 24,640 6 Riparian Planting 2,560 SQ.YD. $ 4 $ 10,240 7 Biodegradable Fabric (COIR) 1,290 SQ.YD. $ 9 $ 11,610 8 Concrete Bridge Foundation, 12 ft wide 2 EA $ 25,000 $ 50,000 9 Bridge, Precast Prestressed, 12 ft wide, delivered 86 LF $ 1,000 $ 86,000 10 Concrete Bridge Foundation, 24 ft wide 1 EA $ 40,000 $ 40,000 11 Bridge, Precast Prestressed, 24 ft wide, delivered 41 LF $ 1,800 $ 73,800 12 Bridge Demolition & Installation 3 EA $ 40,000 $ 120,000 13 Bridge Guardrails 254 LF $ 175 $ 44,450 14 Soldier Pile Wall before Alder Drive Culvert 110 LF $ 2,200 $ 242,000 15 Preservation of Property 1 LS $ 32,000 $ 32,000 B. Beech St Crossing to Alder Drive Crossing Subtotal $ 1,039,740 C. Alder Drive Crossing to Forbusco Vehicle Bridge 1 Excavation & Disposal, creek locations 1,700 CY $ 30 $ 51,000 2 Rock Grade Control Structures 6 EA $ 6,000 $ 36,000 3 Rock Slope Protection 21 TONS $ 160 $ 3,360 4 Riparian Planting 260 SQ.YD. $ 4 $ 1,040 5 Soldier Pile Wall materials & installation (11 ft avg height) 904 LF $ 2,200 $ 1,988,800 6 Concrete Bridge Foundation, 12 ft wide 1 EA $ 25,000 $ 25,000 7 Bridge, Precast Prestressed, 12 ft wide, delivered 50 LF $ 1,000 $ 50,000 8 Bridge Demolition & Installation 1 EA $ 40,000 $ 40,000 9 Bridge Guardrails 100 LF $ 175 $ 17,500 10 Preservation of Property 1 LS $ 22,000 $ 22,000 C. Alder Drive Crossing to Forbusco Vehicle Bridge Subtotal $ 2,234,700 D. Forbusco Vehicle Bridge to Upper Floodplain 1 Excavation & Disposal, creek locations 700 CY $ 30 $ 21,000 2 Rock Slope Protection 14 TONS $ 160 $ 2,240 3 Riparian Planting 110 SQ.YD. $ 4 $ 440 4 Soldier Pile Wall materials & installation (11 ft avg height) 316 LF $ 2,200 $ 695,200 D. Forbusco Vehicle Bridge to Upper Floodplain $ 718,880

Rohner Creek Flood Control and Habitat Improvements 5/30/2013 15:11 City of Fortuna, California Opinion of Probable Construction Cost Based on 10% Plans Subsection Subtotals Item No. Item Description Quantity Unit Unit Cost Cost E. Upper Floodplain 1 Excavation & Disposal, creek locations 10,700 CY $ 30 $ 321,000 2 Rock Grade Control Structures 1 EA $ 6,000 $ 6,000 3 Log Habitat Structures 8 EA $ 5,000 $ 40,000 4 Riparian Planting 7,340 SQ.YD. $ 4 $ 29,360 5 Biodegradable Fabric (COIR) 1,340 SQ.YD. $ 9 $ 12,060 6 Straw Mulch 6000 SQ.YD. $ 3 $ 18,000 7 Private Property Acquisition, developable 2 Acre $ 100,000 $ 150,000 E. Upper Floodplain Subtotal $ 576,420 F. Lower Floodplain 1 Excavation & Disposal, creek locations 14,800 CY $ 30 $ 444,000 2 Rock Grade Control Structures 1 EA $ 6,000 $ 6,000 3 Log Habitat Structures 12 EA $ 5,000 $ 60,000 4 Riparian Planting 11,620 SQ.YD. $ 4 $ 46,480 5 Biodegradable Fabric (COIR) 2,120 SQ.YD. $ 9 $ 19,080 6 Straw Mulch 7000 SQ.YD. $ 3 $ 21,000 7 Private Property Acquisition, developable 3 Acre $ 100,000 $ 260,000 F. Lower Floodplain Subtotal $ 856,560 G. Hillside Creek Improvements 1 Excavation & Disposal, creek locations 900 CY $ 30 $ 27,000 2 Engineered Streambed Material 280 CY $ 100 $ 28,000 3 Rock Slope Protection 84 TONS $ 160 $ 13,440 4 Riparian Planting 480 SQ.YD. $ 4 $ 1,920 5 Biodegradable Fabric (COIR) 960 SQ.YD. $ 9 $ 8,640 6 Precast Reinforced Concrete Box Culvert, material 370 LF $ 1,350 $ 499,500 7 Precast Reinforced Concrete Box Culvert, installation 370 LF $ 150 $ 55,500 8 Precast Reinforced Concrete Box Culvert, headwalls 6 EA $ 30,000 $ 180,000 G. Hillside Creek Improvements Subtotal $ 814,000 H. New Channel Alignment 1 Excavation & Disposal, field locations 44,900 CY $ 20 $ 898,000 2 Engineered Streambed Material 1,500 CY $ 100 $ 150,000 3 Rock Grade Control Structures 15 EA $ 6,000 $ 90,000 4 Log Habitat Structures 12 EA $ 5,000 $ 60,000 5 Rock Slope Protection 511 TONS $ 160 $ 81,760 6 Riparian Planting 17,700 SQ.YD. $ 4 $ 70,800 7 Biodegradable Fabric (COIR) 14,700 SQ.YD. $ 9 $ 132,300 8 Fence 4,774 LF $ 10 $ 47,740 9 Gravel path 1,200 CY $ 60 $ 72,000 10 Rohner Creek plug for diversion 40 CY $ 100 $ 4,000 11 Utility Conflicts 1 LS $ 170,000 $ 170,000 12 Sheet pile wall (includes sheet piles and concrete face) 419 LF $ 600 $ 251,400 13 Railing on sheet pile wall 419 LF $ 30 $ 12,570 17 Private Property Acquisition, developable 4.0 Acre $ 100,000 $ 400,000 18 Private Property Acquisition, non/less developable 1.0 Acre $ 50,000 $ 50,000 H. New Channel Alignment Subtotal $ 2,490,570

Rohner Creek Flood Control and Habitat Improvements 5/30/2013 15:11 City of Fortuna, California Opinion of Probable Construction Cost Based on 10% Plans Subsection Subtotals Item No. Item Description Quantity Unit Unit Cost Cost I. Field Bypass Weir, Culvert and Alcove 1 Labyrinth Weir 1 LS $ 156,500 $ 156,500 2 Labyrinth Weir installation 1 LS $ 50,000 $ 50,000 3 Excavation & Stockpile, field location 19,000 CY $ 15 $ 285,000 4 Rock Slope Protection 1000 TONS $ 160 $ 160,000 5 Backfill with native, field location 12,900 CY $ 10 $ 129,000 6 Material Disposal, field locations 6,100 CY $ 5 $ 30,500 7 Field Rehab 15,400 SQ.YD. $ 18 $ 277,200 8 Utility Conflicts 1 LS $ 40,000 $ 40,000 9 Precast Reinforced Concrete Box Culvert, material 1,970 LF $ 1,350 $ 2,659,500 10 Precast Reinforced Concrete Box Culvert, installation 1,970 LF $ 150 $ 295,500 11 Precast Reinforced Concrete Box Culvert, headwall downstream 1 EA $ 30,000 $ 30,000 12 Private Property Easement Development 1 LS $ 50,000 $ 50,000 I. Field Bypass Weir, Culvert and Alcove Subtotal $ 4,163,200 J. Fortuna Boulevard Bypass Weir and Culvert 1 Labyrinth Weir 1 LS $ 156,500 $ 156,500 2 Labyrinth Weir installation 1 LS $ 50,000 $ 50,000 3 Rock Slope Protection 1000 TONS $ 160 $ 160,000 4 Excavation & Stockpile, Fortuna Blvd. 15,000 CY $ 20 $ 300,000 5 Hazardous Material excavation & disposal 6,400 CY $ 50 $ 320,000 6 Material Disposal (non hazardous) 1,800 CY $ 5 $ 9,000 7 Backfill with native, Fortuna Blvd. 13,200 CY $ 15 $ 198,000 8 Utility Conflicts 1 LS $ 89,000 $ 89,000 9 Precast Reinforced Concrete Box Culvert, material 2,617 LF $ 1,350 $ 3,532,950 10 Precast Reinforced Concrete Box Culvert, installation 2,617 LF $ 150 $ 392,550 11 Precast Reinforced Concrete Box Culvert, headwall downstream 1 EA $ 30,000 $ 30,000 12 Temporary shoring 1 LS $ 100,000 $ 100,000 13 Asphalt Rehab (3" AC, 1 ft base, misc striping) 2,950 SQ.YD. $ 75 $ 221,250 14 Median Rehab 5,820 SQ.YD. $ 28 $ 162,960 J. Fortuna Boulevard Bypass Weir and Culvert Subtotal $ 5,722,210 K. 12th Steet Crossing 1 Rock Grade Control Structures 14 EA $ 6,000 $ 84,000 2 Offset Baffle removal 1 LS $ 15,000 $ 15,000 3 Inlet Apron modifications 1 LS $ 151,000 $ 151,000 4 Estimated additional 5 6 K. 12th Steet Crossing Subtotal $ 250,000

Rohner Creek Flood Control and Habitat Improvements 5/30/2013 15:11 City of Fortuna, California Opinion of Probable Construction Cost Based on 10% Plans Subsection Subtotals Item No. Item Description Quantity Unit Unit Cost Cost I. Field Bypass Weir, Culvert and Alcove HDPE 1 Labyrinth Weir 1 LS $ 156,500 $ 156,500 2 Labyrinth Weir installation 1 LS $ 100,000 $ 100,000 3 Excavation & Stockpile, field location 19,000 CY $ 15 $ 285,000 4 Rock Slope Protection 1000 TONS $ 160 $ 160,000 5 Backfill with native, field location 12,900 CY $ 10 $ 129,000 6 Material Disposal, field locations 6,100 CY $ 5 $ 30,500 7 Field Rehab 15,400 SQ.YD. $ 18 $ 277,200 8 Utility Conflicts 1 LS $ 40,000 $ 40,000 9 HDPE pipe, 3 parallel lines, 60" dia, material 1,970 LF $ 600 $ 1,182,000 10 HDPE pipe, 3 parallel lines, installation 1,970 LF $ 100 $ 197,000 11 HDPE headwall downstream 1 EA $ 30,000 $ 30,000 12 Manholes, special bends, etc 10 EA $ 10,000 $ 100,000 13 HDPE pipe, fusion equipment rental 1 LS $ 40,000 $ 40,000 14 Private Property Easement Development 1 LS $ 50,000 $ 50,000 I. Field Bypass Weir, Culvert and Alcove Subtotal HDPE $ 2,777,200 J. Fortuna Boulevard Bypass Weir and Culvert HDPE 1 Labyrinth Weir 1 LS $ 156,481 $ 156,481 2 Labyrinth Weir installation 1 LS $ 100,000 $ 100,000 3 Rock Slope Protection 1000 TONS $ 160 $ 160,000 4 Excavation & Stockpile, Fortuna Blvd. 15,000 CY $ 20 $ 300,000 5 Hazardous Material excavation & disposal 6,400 CY $ 50 $ 320,000 6 Material Disposal (non hazardous) 1,800 CY $ 5 $ 9,000 7 Backfill with native, Fortuna Blvd. 13,200 CY $ 15 $ 198,000 8 Utility Conflicts 1 LS $ 89,000 $ 89,000 9 HDPE pipe, 3 parallel lines, 60" dia, material 2,617 LF $ 600 $ 1,570,200 10 HDPE pipe, 3 parallel lines, installation 2,617 LF $ 100 $ 261,700 11 HDPE headwall downstream 1 EA $ 30,000 $ 30,000 12 Manholes, special bends, etc 10 EA $ 10,000 $ 100,000 13 HDPE pipe, fusion equipment rental 1 LS $ 50,000 $ 50,000 14 Temporary shoring 1 LS $ 100,000 $ 100,000 15 Asphalt Rehab (3" AC, 1 ft base, misc striping) 2,950 SQ.YD. $ 75 $ 221,250 16 Median Rehab 5,820 SQ.YD. $ 28 $ 162,960 J. Fortuna Boulevard Bypass Weir and Culvert Subtotal HDPE $ 3,828,591