Magnolia Storm Drain Improvement Project

The City of Larkspur, California is requesting bids for the Magnolia Storm Drain Improvement Project (CIP# 27-302), a gravity storm drain construction and concrete replacement project within street rights-of-way and private property easements, with bids due October 13, 2026.

The scope encompasses construction of new gravity storm drain pipe (12-inch HDPE), installation of storm drain inlets and catch basins, modification of existing catch basins, replacement of pathways, ditches, curb, gutter and sidewalk, CCTV inspection of new drainage, and all preparatory work including surveying, staking, potholing, utility locating and coordination. The contractor must coordinate with the City of Larkspur, Marin Municipal Water District, and other utilities. Major bid items are priced as lump-sum mobilization and demobilization, lump-sum sheeting and shoring, unit pricing for catch basin modifications, linear-foot pricing for 12-inch HDPE pipe and concrete work, and unit pricing for new storm drain inlets.

The contractor must submit a comprehensive work plan, traffic control and detour plan, construction schedule with milestone dates, erosion and sediment control plan, and tree protection plan prior to preconstruction conference. All work must comply with OSHA requirements and California Labor Code Section 6707 excavation safety standards. At least one traffic lane in each direction must be maintained at all times. Designated non-workdays include Veterans Day, Thanksgiving, Christmas week, New Year's Day, and Martin Luther King Day.

The contractor bears all costs for mobilization, demobilization, permits, insurance, bonds, surveying, traffic control, temporary facilities, environmental compliance, hazardous materials testing and disposal, dewatering, and erosion control with no additional compensation beyond the bid items and mobilization line.