Agmt 2014 Carollo Engineers Inc - Laserfiche WebLink

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EXHIBIT A INTRODUCTION • The City plans to fill the western third of the former polishing pond to create a 1-acre equipment pad for the day to day operation and maintenance activities of the Water Pollution Control Plant (WPCP). Fill will comprise approximately 16,000 cubic yards of soil currently stockpiled at the WPCP drying bed area (spoils from the construction of the WPCP rehabilitation project). Chemical testing results indicate that the fill contains elevated concentration of lead, hydrocarbons, polychlorinated biphenyls (PCBs), and chlorinated pesticides. It is noted that no total lead concentrations exceeded 1,000 mg/kg, one of the criteria used to classify a material as hazardous. The City has conducted preliminary discussion with the Regional Water Quality Control Board (RWQCB) and received concurrence with the approach. However, the RWQCB requested a "50 percent design document"for their review prior to giving their final concurrence with the project. • SCOPE OF SERVICES Scope of services for this design consists of the following tasks Task 1 –Geotechnical Investigation: Task 1.1 - Review the existing reports on the ponds and spoils Consultant will review the following reports provided by the City: • Evaluation of Effluent Pond Sludge Sampling Results, City of San Leandro Wastewater Treatment Plant report dated November 1995 by EOA Inc. • Evaluation of Pond Closure Options, City of San Leandro Wastewater Treatment Plant report dated January 1997 by EOA Inc. • Conceptual Design for Closure of Effuent Pond, City of San Leandro Wastewater Treatment Plant report dated November 1997 by EOA Inc. • Geotechnical and Hydrogeological Investigations, San Leandro Water Pollution Control Plant report dated July 30, 1999 by SCI Inc. Task 1.2- Conduct a geotechnical investigation to evaluate subsurface conditions of the berms and pond bottom as well as the proposed fill material. Based on the review of the above documents as well as in-house files and boring logs for the Site, Consultant will complete a geotechnical evaluation of fill and the proposed fill area. The investigation will include: • A total of 3 exploratory borings to maximum depths of 50 feet. The berm surrounding the pond will be accessible to conventional truck-mounted drilling equipment. The borings will be advanced using a mud rotary drill rig. • Subsurface exploration will be conducted under the direction of a field engineer of Consultant who will supervise, log, and collect samples from the borings. Standard penetration resistance will be determined in the borings at appropriate increments. Relatively undisturbed samples may also be recovered from various depths in the borings using the Modified California Sampler and or Shelby Consulting Services Agreement between City of San Leandro and Carollo Engineers, Inc.—Exhibit A Page 1 of 5