The document summarizes a project to modify Dike 5 at Folsom Lake through partial removal of the downstream face and construction of new sand and gravel drains to control internal erosion. Key aspects of the project included excavating 40,000 cubic yards of the existing downstream face, installing 1,500 feet of 15-inch toe drain pipe, and placing 18,000 cubic yards of fine sand filter and 2,500 cubic yards of coarse gravel filter. The work was performed between September 2008 and February 2009 using conventional earthmoving equipment as well as a specialized material delivery system to precisely place construction materials.

1. Construction Methods for Folsom Lake Dike Modification Presented by Matthew D. Marks Magnus Pacific Corporation Roseville, California

2. Overview Project Name - Dike 5 Embankment Modifications Engineer/Designer - Bureau of Reclamation’s Safety of Dams (SOD) Program Prime Contractor – DD-M Crane and Rigging Contract Value - $3,204,790 Project Location - Located on the north shore of Folsom Reservoir near the intersection of Auburn-Folsom Boulevard and Eureka Road in Granite Bay Construction Schedule - Construction performed between September 2008 and February 2009

3. Area Map FOLSOM DAM FOLSOM LAKE DIKE 5 SACRAMENTO AREA

4. Project Summary Scope of Work Project involved the partial removal of the downstream face of the existing dike to construct new sand and gravel drains to control internal erosion Change Orders No major change orders; several quantity variations (overruns and underruns) By the Numbers 40,000 CY excavation for existing downstream face 3,500 CY excavation for new toe drain and out fall trench Installed 1,500 LF of 15” HDPE toe drain pipe Installed 18,000 CY (28,000 TN) of fine filter (sand) and 2,500 CY (4,000 TN) of coarse filter (gravel) 85,000 CY replacement of stockpiled and onsite borrow soils

5. Scope of Work Site preparations including recreation trail detour Stripping top soil and excavation of downstream face from 2.25H:1V to 2H:1V slope Excavation of toe drain and outfall trench Installation of toe drain and outfall piping and manhole Toe drain backfill using coarse filter (gravel) and chimney drain using fine filter (sand) Reconstruct downstream face to 2.5H:1V slope using stockpiled and onsite borrow materials Replace topsoil and site restoration

6. Schedule Began site preparations in mid August 2008 Restricted to no heavy construction work until after Labor Day 2008 Excavation work approximately 4 weeks at average rate of 3,000 CY per day Concurrent placement of backfill materials including toe drain pipe, fine filter, coarse filter, and shell fill (average 100 TN coarse filter, 500 TN fine filter and 2,000 CY shell fill per day) over 3 to 4 month period Performed backfill and restoration work through first half of rainy season Completed work in February 2009 (Contractual Completion Date in March 2009)

7. Embankment Fill Diagram ~ EL. 480 2.5 h 1 v 1 v 2 h ~ EL. 380 Typical Embankment Fill Detail with Toe Drain

8. Toe Drain Diagram Typical Toe Drain Detail with Pipe

9. Conventional Equipment Excavation & Hauling Equipment PC 400 Excavator PC 300 Excavator CAT D9 Dozer (rock ripping) 35 TN Articulated Haul Trucks (3 EA) Komatsu 450 Front End Loader Backfill & Grading Equipment CAT D6 Dozer (2 EA – GPS) CAT 815 Compactor CAT 140 Motor Grader 48” Smooth Drum Roller (2 EA)

10. Specialized Equipment Material Delivery System Drive Over End Dump Truck Unloader 30 TN Surge Hopper/Conveyor Total 70 TN Onsite Storage Capacity Direct Load Conveyor Trucks

11. Specialized Equipment Conveyor Trucks CAD (Conveyored Aggregate Delivery) Ability to place materials with accuracy and reduced waste Output approximately 250 to 500 TN / DY

12. Construction Materials Shell Fill Onsite Material (Decomposed Granite) Existing Dike Embankment Borrow Site within Folsom Reservoir 3” Minus Fine Filter Imported Material Clean Washed Sand 3/8” Minus 0 – 3% Passing No. 200 Sieve Coarse Filter Imported Material Clean Washed Gravel 1” Minus 0 – 5% Passing No. 8 Sieve

13. Pre-Construction Existing Downstream Face

14. Pre-Construction Existing Top of Slope

15. Downstream Face Excavation Excavated Face and Toe Drain (and view of Blanket Drain)

16. Toe Drain Excavation Toe Drain Excavation and Dewatering

17. Borrow Site Excavation Stockpiled Shell Fill in Folsom Reservoir

18. Toe Drain Compaction Testing Fine Filter Material

19. Toe Drain Toe Drain Backfill with Fine and Coarse Filter Material

20. Shell Fill Shell Fill Placement on New Downstream Face

21. Shell Fill Shell Fill Placement and Compaction

22. Shell Fill Fine Filter and Shell Fill Placement

23. Shell Fill Shell Fill Grading (and Material Delivery System)

24. “The Big Picture” Fine Filter and Shell Fill Placement

25. Chimney Drain Fine Filter Placement with Conveyor Truck

26. Chimney Drain Fine Filter Placement (Non-compacted Loose Lift)

27. Chimney Drain Fine Filter Placement Near Top of Downstream Face

28. Chimney Drain New Blanket Drain on Upper Slope

29. Finishing Excavator Pulling Up Slope Near Top of Dike

30. Finishing Top of Chimney Drain and Shell Fill Placement

31. Finishing Final Gravel Road on Crest of Dike

32. Finishing Finish Slope Grading and Topsoil (Dredge Tailings) Placement

33. Finishing Finished Slope (In Progress)

34. Finishing Finished Grade and Hydroseeding

35. Project Highlights Excavation on face of dike and rock ripping Excavated with CAT D6 GPS Dozers pushing down slope; load out with Komatsu PC400 Excavator and Articulated Haul Trucks Rock ripping in Borrow Site and Toe Drain using CAT D9 Dozer with rippers; intensely weathered granitic rock with uniaxial compressive strength ranging from about 330 to 850 psi Placement of coarse and fine filter material without cross blending or waste Material Delivery System replaced managing stockpiles and waste on ground Conveyor Trucks allowed precise placement of coarse and fine filter with less than 1% waste Achieved placement of 28,000 TN of fine filter without any failing tests for No. 200 sieve; material tested in place after compaction Determination of proper compaction equipment and methods Test sections on fine filter to determine proper equipment to minimize break down of material Moisture conditioning fine filter and shell fill

36. Project Highlights (cont.) Managing site logistics, equipment access and coordination Heavy equipment traffic patterns; one way traffic through work areas Working in limited work space; steep slopes Weather related impacts and site storm water control Most backfill work performed during rainy season Installation and maintenance of site SWPPP controls Effects of rain on site conditions Construction survey control for asbuilt and payment Utilized GPS machine control on CAT D6 Dozer for excavation and backfill; achieved specified tolerances Maintained full time surveyor onsite to survey asbuilt conditions Organization of data and volume calculations Health and Safety Completed the project with no injury or accidents Minor incident involving propane powered fence post pounder; caught fire due to a manufacturer defect; product was recalled

37. Questions Any questions? DD-M Crane & Rigging 2900 Main St., Suite 103 Alameda, CA 94501 (510) 769-8707 (510) 769-8711 fax P.O. Box 520/160 River Rd Rio Vista, CA 94571 (707) 374-2000 (707) 374-2728 fax Denise Maurer - President Magnus Pacific Corporation 3001 Lava Ridge Court, Suite 240 Roseville, CA 95661 (916) 233-1139 (916) 783-0215 fax Louay Owaidat - President