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Tubes, as appropriate, to help determine strength and compressibility characteristics of the subsurface materials, particularly in clayey soils. • In accordance with the applicable permit requirements, all exploration borings will be backfilled with a lean cement grout mix. Soil cuttings and drilling fluid consisting of water and bentonite from the borings will spread on site at the locations of the exploration. • City will provide the labor and equipment suitable for completing test pits within the Site. Consultant will select 4 test pit locations, log the test pits to evaluate the sludge thickness and underlying material, and collect bulk samples for geotechnical testing. Consultant will prepare a Site Plan showing the proposed sampling locations, and Consultant will confirm the sampling schedule with City at least 48 hours in advance. • Soil strength and characterization data will be used to construct idealized soil models for static and seismic slope stability analyses using Slope/W software. In addition, the settlement of the equipment pad surface will be calculated for the weight of the proposed fill. The time frame for these settlements to occur will be part of the analysis. • The results of the exploration, including boring logs, laboratory testing, slope stability and settlement analyses, and earthwork recommendations for construction of the equipment pad will be included in the final geotechnical report. Preliminary results will be available for review prior to report publication. Task 2- Chemical Testing and Stabilization Study: Concurrent with our geotechnical investigation, Consultant will collect samples of fill and pond sludge for chemical analyses. The purpose of the testing will be to confirm the total and soluble fractions of chemicals in those materials. Up to 8 composite samples of the fill soil will be collected by hand and 4 discreet samples of the pond sludge will be collected from the test pit spoils generated during the geotechnical investigation. The City will provide the labor and backhoe or excavator equipment to assist with sampling within existing stockpile. Consultant will prepare a Site Plan showing the proposed sampling locations, and will confirm the sampling schedule with the City at least 48 hours in advance. All samples will be collected using standard industry practices. Sludge samples will be tested for the following: • Total Petroleum Hydrocarbons as gasoline (TPHg) in accordance with EPA Test Method 8015; • Total Petroleum Hydrocarbons as diesel and motor oil (TPHd and TPHmo) with silica gel cleanup in accordance with EPA Test Method 8015; • Volatile Organic Compounds (VOCs) in accordance with EPA Test Method 8260; • 17 heavy metals in accordance with EPA Test Method 6000 and 7000 series; • Polychlorinated bi-phenyls (PCBs) and organochlorine pesticides in accordance with EPA Test Methods 8081 and 8082; • Soluble lead using the Waste Extraction Test; • Soluble lead, TPH, PCBs, and pesticides using the Waste Extraction Test and de-ionized water as the solute. Consulting Services Agreement between City of San Leandro and Carollo Engineers, Inc.—Exhibit A Page 2 of 5