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City of Centerville <br /> Project SP-07-03738 <br /> November 29,2007 <br /> Page 14 <br /> F. Qualifications <br /> F.I. Variations in Subsurface Conditions <br /> F.l.a. Material Strata <br /> Our evaluation,analyses and recommendations were developed from a limited amount of site and <br /> subsurface information. It is not standard engineering practice to retrieve material samples from borings <br /> continuously with depth,and therefore strata boundaries and thicknesses must be inferred to some extent. <br /> Strata boundaries may also be gradual transitions,and can be expected to vary in depth,elevation and <br /> thickness away from the boring locations. <br /> Variations in subsurface conditions present arnong borings may not be revealed until additional <br /> exploration work is completed,or construction commences. If any such variations are revealed,our <br /> recommendations should be re-evaluated. Such variations could increase construction costs,and a <br /> contingency should be provided to accommodate them <br /> F.l.b. Groundwater Levels <br /> Groundwater measurements were made under the conditions reported herein and shown on the boring <br /> logs,and interpreted in the text of this report. It should be noted that the observation period was <br /> relatively short,and groundwater can be expected to fluctuate in response to rainfall,flooding,irrigation, <br /> seasonal freezing and thawing,surface drainage modifications and other seasonal and annual factors. <br /> F.Z. Continuity of Professional Responsibility <br /> F.2.a. Plan Review <br /> This report is based on a limited amount of information,and a number of assumptions were necessary to <br /> help us develop our recommendations. It is recommended that our fine review the geotechnical aspects <br /> of the designs and specifications,and evaluate whether the design is as expected,if any design changes <br /> sign have affected the validity of our recommendations,and if our recommendations have been correctly <br /> interpreted and implemented in the designs and specifications. <br /> F.2.b. Construction Observations and Testing <br /> It is recommended that we be retained to perform observations and tests during construction. This will <br /> allow correlation of the subsurface conditions encountered during construction with those encountered <br /> by the borings,and provide continuity of professional responsibility. <br />