PARKING STRUCTURE PILE DRIVING OBSERVATION

Recommendation:

It is recommended that the City Council:

1. Retain Associated Soil Engineering, Inc., of Long Beach, CA, to provide pile driving monitoring for the north pier parking structure in the amount of $20,707.50.
2. Authorize the Mayor to execute the agreement and the City Clerk to attest the professional services agreement subject to approval of the City Attorney.
3. Authorize the Director of Public Works to issue change orders as necessary within budget.

Background:

Associated Soil Engineering Inc., (ASE) was hired by Gordon Chong & Partners Inc., "the architect", to provide geotechnical exploration reports for the construction of the parking structure. The purpose of that exploration was to evaluate the general soil conditions at the site, including evaluation of the site specific liquefaction potential, and provide geotechnical recommendations for the design and construction of the proposed parking structure.

Analysis:

Since ASE conducted the geotechnical exploration for the site and recommended the driven pre-cast pile foundations to support the structure, as well as geotechnical criteria for site grading and construction of floor slab-on-grade, staff is recommending that the City hire ASE to provide pile driving observation and testing during construction of the parking structure.

The geotechnical services during site preparation, pile foundation installation and compaction test of soils or slab support and utility line backfill for proposed parking structure is planned to include:

Review of project plans and specifications prior to construction.

1. Attendance at meetings, as requested.
2. Observation during pile driving operations.
3. Laboratory testing, as necessary, tentatively including maximum density/optimum moisture content and sulfate.
4. Observation and testing of structural fill for slab-on-grade support.
5. Observation and testing of utility line backfill.
6. Engineering review and consultation, as necessary.
7. Preparation of a Pile Driving and Grading Report.

Fiscal Impact:

The 1998/1999 fiscal year budget for the parking structure (CIP 96-624) construction services is $320,000, this amount will be reduced by $20,707.50. The construction services budget is also impacted by $275,750, due to the award of the contract for Construction Management Services to Harris & Associates for the parking structure. The remaining balance for construction services will be $23,542.50.

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