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'. .' . . I . . .. samples, gas sampling and groundwater sampling to see what is migrating. Mr. Ripple stated that there are very low level of things leaving the site. Mr. Ripple stated that - ChemRisk made very conservative assumptions, over estimated the actual exposures, about what could happen, including the absence of a cap over a large area during development and workers contacting contaminated water, and made recommendations based on those scenarios about establishing controls. Also, mitigation recommendations were made for after development was completed based on the knowledge that the materials under the cap were saturated by the slough and groundwater. In answer to Council questions, Mr. Peterson advised that the property owner would do the monitoring under the County's supervision and requirements. Mr. Peterson advised that the County is the arm of the state and would oversee that the public health was insured, and that waters do not become contaminated. Mr. Peterson described the experience of County staff with similar projects, access to the State's Risk Management Board and the County requires a third party technical review of plans and work. In answer to Council questions regarding the conclusion that there was no significant health risk in building this development, Dr. Morrow advised that his role was to provide advice to the Environmental component of the County Health Department, and stated that he agreed with the conclusion that there is no significant health impact from this project. - In answer to Council questions, Mr. Peterson explained the Phase I Site Assessment, and the findings were that the site was an old solid waste refuse site, and there is uncertainty as to what is actually there. That is why Phase II monitoring is going on right now. Mr. Peterson described the health and safety plan that has to be submitted to the County, and at the time of any site work there are portable gas monitors present that are constantly checked. Mr. Peterson confirmed Mayor Gasparini's description of the County's ability to dictate terms of the developer's health and safety plan. Mr. Peterson stated that the County was as concerned as the residents of Redwood Shores about potential hazards and that is why the County is involved. In answer to Council questions about newly found quake faults through the bay, Westport being in a high hazard area and use of conservative soil, Mr. Rodriguez stated they had retained three soil engineers that had taken borings from shallow to great depths and an independent soil engineer will review those tests. Also, a structural engineer from an earthquake engineering firm, has already reviewed those tests to make sure the soil was buildable. Mr. Rodriguez stated that all Peery and Arrillaga developments are covered by earthquake insurance. Mr. Rodriguez described how pilings were installed, the ph neutral soil build up, lack of grading, and stated that nothing is actually driven into the soil, and that it wasn't anticipated that utilities would be put into the cap. - MINUTE BOOK NO. 53 Regular Meeting Minutes Page No. 023 January 16, 1995 Page 14