RWR has done a lot of work in the Mill Valley area, including foundation repairs, retaining walls and drainage repairs. You may see our trucks and drilling equipment on East Blythedale, working their way up into the Mill Valley neighborhoods. The hilly Mill Valley area, at the foot of Mt Tamalpais gets a lot of rain and moisture, which can cause foundations to become unstable, and retaining walls to fail. It is important to correct these problems with well designed, well engineered plans, that are properly constructed. RWR specializes in this type of construction work in the Mill Valley area, and has great relationships with many engineers and architects working in this area. If you have a situation you’d like us to look at, please give us a call.

Here’s an example of foundation repair work we perform in the Mill Valley area. You can see this work requires skillful experienced foundation contractors and very competent crew. RWR brings you the expertise you need for your important project.

This estimate is being made for driveway retaining wall replacement, driveway replacement and driveway expansion. The estimate is being made on a preliminary basis only and is subject to approval by a qualified structural engineer. The bid is for the installation of concrete reinforced maximum 36 inch high driveway retaining wall on 18 inch piers along the driveway. In addition an estimate for driveway replacement is included along with an estimate for a driveway expansion. The price includes labor and materials to complete the job as per the itemized scope of work listed below.

Scope of Work

Mobilize, Demo and Remove Vegetation
• Mobilize to site and remove all vegetation necessary. Remove spoils from site.
• Bid includes engineering drawings.

Piers
• Drill for seven (7) 18” diameter x a maximum of 10 feet deep
• Install seven (7) 18” concrete reinforced piers a maximum of 10 feet per plans.

Footing
• Excavate for footing (if necessary) on top of piers approximately 56 linear feet as called for by engineer. Off haul spoils from site.
• Install approximately 56 linear feet of concrete reinforced footing on top of piers as called for by engineer.

Drainage
• Install approximately 56 linear feet 3” diameter SDR 35 Perforated Pipe in a rock pocket behind grade beam wall.
• Install Miradrain 6000 3 feet high by 91 feet long or as an alternative (contractors option) provide for a drain rock behind grade beam 9 inches wide by 3 feet high.
Note: Drain to exit to daylight at end of grade beam. Final connection not included.

Retaining Wall
• Install an 8 inch thick concrete reinforced retaining wall 56 linear feet to a maximum of 36” high per engineering specifications.

Concrete Reinforced Driveway
• Excavate and Demo existing driveway. Approximately 825 square feet. Offhaul spoils from site.
• Install a 5 inch concrete reinforced driveway over 6-mill membrane with 2” of sand and 4” of crushed rock base. Approximately 825 square feet of new concrete driveway.
Add Expanded Driveway and new Retaining Wall to Driveway Replacement
• Install new concrete retaining wall to allow for driveway expansion. Estimated wall to be no greater than 15 linear feet with wall height to be no greater than 4 feet. Includes drainage. Wall thickness to be no greater than 8 inches.
• Additional square feet of driveway approximately 200 square feet.
Note: Contractor will require the use of a structural engineer to prepare plans for work proposed. It will engage the engineer and assist the homeowner in the final design. It will require a building permit be applied for and plans approved by the appropriate regulatory bodies for work can commence.
Exclusions
• Cost of, bonds, inspections and testing.
• Any work on utilities including buried pipes.
• Increased cost of drilling or excavation due to hard rock, underground water or caving soils. (Hard rock drilling is defined as a penetration rate slower than 1 ft. in 5 minutes.) (Hard rock excavation is defined as material that cannot be excavated with a conventional backhoe or excavator bucket.)
• Excavation of hazardous materials, underground tanks, or materials unacceptable at dumps.
• Damage or replacement of fence or landscaping.
• Damage to existing retaining walls.