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EXHIBIT "A" <br /> <br /> BAY AREA GEOTECHNICAL GROUP <br /> 950 Industrial Avenue · ?alo Alto California 94303-4911 <br /> (650)852-9133 ~' fax (650)852-9138" bagg@bayareageorechnical.com <br /> <br /> : S[D 2 ~ 2~3 ~ S~t~b~ 18, 2003 <br /> r'~ -~ r ~rv ProposalNo. 03-187 <br /> Mr. Jon L~ch, Ci~ Engineer~~ - ~?~-~; <br /> Ci~ of Redwood Ci~ <br /> 1017 Middlefield Road <br /> R~wood Ci~, CA 94064 <br /> Re: Proposal <br /> Geotec~ic~ Evaluation <br /> Fa~ Hill Slide <br /> 929 & 949 Nob Hill Road <br /> R~wood Ci~, Califo~a <br /> De~ ~. L~ch: <br /> <br /> We are pleased to have been asked to provide a proposal for performing a geotechnical evaluation <br /> of the old Farm Hill landslide in Redwood City. <br /> <br /> We have reviewed the information regarding the subject landslide that you have provided to our <br /> office, and have also visited the site to examine present conditions. The following paragraphs <br /> present our initial impressions regarding the likely stability of the old landslide, outlines a scope of <br /> work for further geotechnical evaluation, and presents an estimate of fees to perform the work. <br /> <br /> The top portion of the slide mass originated on two lots on Nob Hill Road, while the toe of the slide <br /> encroached into three lots on Farm Hill Blvd. A detailed history of the slide is not repeated here, <br /> rather only pertinent items relating to the present conditions of the slide are outlined below. <br /> <br /> 1) Shannon and Wilson presented a fairly extensive analysis of the slide in their report of December, <br /> 1967. Their work included six borings (they also identified 4 piezometers installed by others in <br /> December, 1966), and a geologic reconnaissance, which identified a fault that had apparently <br /> created a seepage barrier, producing high pore water pressures within the slope. They <br /> recommended installing a deep drainage gallery at the top of the slope, and constructing a <br /> buttress fill at the base of the slope. They also stated that "If no further movement develops this <br /> winter after construction of the drainage gallery, then the necessity for constructing the buttress <br /> at the toe of the slide should be reviewed. It is possible that the slide may be adequately stable <br /> without the buttress." <br /> <br />Geotechnical Engineering · Geo-environmental Engineering · Geology & Engineering Geology <br /> <br /> <br />