Need underpinning to permanently stabilize home or level floors? Call 415-457-5658 for a prompt, reliable estimate from our experienced estimator. RWR has been installing underpinning in San Francisco for over 24 years. You will see our trucks and equipment working in San Francisco neighborhoods like the Marina, Pacific Heights, Nob Hill, Western Addition, Haight, Castro, Noe Valley, Twin Peaks and so on.
Here’s the kind of detailed estimate you can rely on, to correct foundation problems and perform structural work, including even zero lot line jobs that require our expertise:
This is an estimate based on plans. The scope of work includes clean up of slide debris, installing wood lagged soldier pier retaining wall, Diversion Barrier Wall, installation of temporary drain pipe, erosion control items per plans and Visqueen covering. The price includes all labor and material to complete the work as per the itemized scope of work below.
Scope of Work
Mobilization and Layout
• Mobilize to jobsite with necessary equipment to complete job (See notes below).
• Layout to be completed per plans and specifications with engineer approval.
• Any additional survey costs are not included
• Daily Cleanup
• Final Cleanup
Slide Debris
• Remove all loose modular blocks, concrete with patio stone, trees, brush and other identified debris from slide area and grade as necessary to prevent ponding.
• Access will occur from 10 Tara View back patio to driveway. Much of existing patio will be demolished to make ramp access. Oak tree in patio to be removed.
• Existing wall to remain. Modular walls not loose to remain.
• No off haul of earth spoils
Wood Lagged Soldier Pier Retaining Wall
Drill
• Drill sixteen (16) 18” diameter x 10 ft maximum depth pier holes using small excavator. Final Depth to be determined by soils engineer. Additional cost per ft plus cost of I beam. Standard drilling conditions.
• No off haul of drill spoils.
Steel I Beams
• Install steel I beam post W8 x 18 a maximum of 16 ft in length per plans and specifications (See notes below)
• I beams to be coated with two coats of metal primer and one coat of flat back exterior over exposed portions of beam per plans.
• Place concrete in pier hole per plans and specifications (See table).
Note: Estimate assumes wall height maximum of 6 ft and depth of pier hole at 10 ft. per wall schedule with 6 ft pier spacing. Price to be adjusted for change in assumption.
Wood Lagging
• Install wood lagging with 4 x 12 pressure treated wood lagging per plans and specifications to a maximum height of 6 ft. Cut ends to be treated with preservative treatment.
Drainage
• Install a drain rock pocket behind wall approximately 1 ft back from wall and cap with a 1 ft native soil cap.
• Pocket includes 4” perforated SDR 35 pipe.
• Connect to temporary drain lines to be installed.
• Backfill voids behind wall with native soils. Additional cost for any import required.
Diversion Barrier Wall
Drill
• Drill eleven (11) 18” diameter x 16 ft maximum depth pier holes using small excavator. Final Depth to be determined by soils engineer. Additional cost per ft plus cost of I beam. Standard drilling conditions.
• No off haul of drill spoils.
Steel I Beams
• Install steel I beam post W8 x 21 a maximum of 22 ft in length per plans and specifications (See notes below)
• I beams to be coated with two coats of metal primer and one coat of flat back exterior over exposed portions of beam per plans.
• Place concrete in pier hole per plans and specifications (See table).
Note: Estimate assumes wall height maximum of 6 ft and depth of pier hole at 16 ft. per wall schedule with 6 ft pier spacing.
Wood Lagging
• Install wood lagging with 4 x 12 pressure treated wood lagging per plans and specifications to a maximum height of 6 ft. Cut ends to be treated with preservative treatment.
Erosion Control and Drainage
• Install fiber roll and silt fence per plans and specifications.
• Cover entire slide area with 6 mil visqueen plastic per plans and specifications.
• Anchor visqueen with anchored sand bags
• Install temporary drain lines using 4 inch, 6 inch and 8 inch flexible lines connecting all up slope drainage as directed by engineer.
• At bottom of slide area install a dissipater per plans and specifications. All temporary drainage to be connected to dissipater.
Qualifications and Clarifications
• Job is bid as package.
• Includes one mobilization only.
• Prices are subject to adequate supply of wood, steel, rock, concrete, and asphalt, PVC resins, PVC pipe, fittings at prices quoted at bid time and are good for 30 days.
• Proposal is based on working std 40 hours per week, 5 work days and mutually agreeable schedules.
• Survey of property lines must be done by licensed surveyor. Survey points must be provided.
• Price assumes site is dry and work can be performed in normal fashion. Due to time of year there may be additional costs if site becomes wet.
• Deposit with progress payments every two weeks. No retention.
Exclusions
• Cost of plans, permits, bonds, testing and inspections.
• Any additional work due to utilities including buried pipes or irrigation pipes unless noted.
• Increased costs of excavation or drilling due to hard rock, caving or underground water. (Hard rock excavation is defined as material that requires the use of pneumatically or hydraulically operated hammers or rams to excavate.) (Hard rock drilling is defined as a penetration rate slower than 1 ft. in 5 minutes).
• Replacement of damaged landscaping, driveway or fence. (Driveway will have much activity and shows extensive damage – No allowance has been made for driveway repair).
• Excavation and off hauling of hazardous materials, underground tanks, or materials unacceptable at dumps.
• Any work related to landscaping, fences or gates except as outlined
• Survey of property lines
• Landscaping or irrigation
• Excludes electrical and plumbing
• Off haul of slide spoils
