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Unofficial Notice of Invitation to Bid (NIB)

San Dimas City is seeking bids from qualified and interested contractors for the following project titled, CHARTER OAK MOBILE ESTATES RETAINING WALL – PHASE 2, identified under Solicitation ID: 2025-06. Work is to be performed near 245 E Bonita Ave, San Dimas, CA 91773, USA in Los Angeles County.

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General Project Description

This project involves the removal of existing retaining walls, existing trees and stumps, and pony walls, followed by the construction of new masonry retaining walls at the Charter Oak Mobile Estates. The work also includes comprehensive site preparation, excavation, earthwork, grading, backfilling, temporary construction security fencing, waterproofing of new walls, installation of drainage systems, traffic control, and adherence to all required environmental protection measures (NPDES and BMPs).

General Bid Items

  • Quantity: 1  Unit: LS  Work Item: Mobilization, Clearing, Grubbing, Salvaging Existing Improvements, including NPDES requirements.
  • Quantity: 1  Unit: EA  Work Item: Remove and Dispose of Existing 32" Tree Stump.
  • Quantity: 2  Unit: EA  Work Item: Remove and Dispose of Existing 6"-12" Diameter Tree.
  • Quantity: 75  Unit: LF  Work Item: Removal, Haul Off and Disposal of Existing Pony Wall.
  • Quantity: 75  Unit: LF  Work Item: Removals, Haul Off and Disposal of Existing 3' Block Wall.
  • Quantity: 75  Unit: LF  Work Item: Removals, Haul Off and Disposal of Existing 5' Block Wall.
  • Quantity: 75  Unit: LF  Work Item: Construct 3'-6" Masonry Retaining Wall, Specifications: includes excavation, footings, compaction of selected backfill, grout, wall cap, rebar, backfill, waterproofing (two coats of liquid waterproofing membrane on back of wall), drain (4" perforated PVC pipe in 1/4" angular gravel pocket), temporary support system, masonry units (medium weight "GRADE -N" concrete blocks, 6" height x 16" long Precision Block CMU with 10"x 2"x16" Cap, La Paz (Tan) color or approved equal, running bond), mortar ("type-s" per ASTM C-270, 1 part portland cement, 0.25-1.5 parts lime putty/hydrated lime, 3 parts sand), grout (fluid consistency, 1 part cement, 3 parts sand for spaces < 4"; 1 part cement, 2 parts sand, 2 parts pea gravel for spaces > 4", solid grout all cells), concrete (high early strength, 2,500 psi @ 72 hours, 3600 psi @ 28 days, 560-C-3250 min, Cement Type III per ASTM C-150, aggregates per ASTM C-33, max 1.5" size, 1" max for slabs), all steel reinforcement (new deformed bars per ASTM A-615, grade 60), splicing (min 60 bar diameter laps, 30" min).
  • Quantity: 75  Unit: LF  Work Item: Construct 6' Masonry Retaining Wall, Specifications: same as item 7.

NAICS Classification

NAICS 238910 – Site Preparation Contractors (For demolition, clearing, grubbing, excavation, earthwork, and grading), NAICS 238140 – Masonry Contractors (For construction of concrete masonry retaining walls), NAICS 238110 – Poured Concrete Foundation and Structure Contractors (For retaining wall footings and concrete work), NAICS 237310 – Highway, Street, and Bridge Construction (For traffic control, temporary striping, and general public works site management)

Records and Due Date

This bid opportunity was entered into BidAmerica on January 26, 2026, and was last updated on January 26, 2026. All bids and/or proposals are due on February 5, 2026.

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Legal Disclaimer

All bidders are responsible for reviewing and verifying all official bid documentation directly from the issuing agency. BidAmerica aggregates public bid information for advertisement purposes for contractors and government agencies convenience. This Notice of Invitation to Bid is for reference purposes only and is not an official or complete representation of any documents issued by San Dimas City. BidAmerica does not guarantee the accuracy, completeness, or timeliness of any information displayed and shall not be held liable for any errors, omissions, misinterpretations, or damages resulting from reliance on this summary. Contractors must obtain all official information—including plans, specifications, addenda, deadlines, submission requirements, qualifications, and bidding conditions—directly from San Dimas City prior to bidding.