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City of Arden Hills <br />Project B2204011 <br />June 23, 2022 <br />Page 14 <br /> <br /> <br />Variations in subsurface conditions present between exploration locations may not be revealed until <br />performing additional exploration work, or starting construction. If future activity for this project reveals <br />any such variations, you should notify us so that we may reevaluate our recommendations. Such <br />variations could increase construction costs, and we recommend including a contingency to <br />accommodate them. <br /> <br />E.1.b. Groundwater Levels <br />We made groundwater measurements under the conditions reported herein and shown on the <br />exploration logs, and interpreted in the text of this report. Note that the observation periods were <br />relatively short, and project planning can expect groundwater levels to fluctuate in response to rainfall, <br />flooding, irrigation, seasonal freezing and thawing, surface drainage modifications and other seasonal <br />and annual factors. <br /> <br />E.2. Continuity of Professional Responsibility <br /> <br />E.2.a. Plan Review <br />We based this report on a limited amount of information, and we made a number of assumptions to help <br />us develop our recommendations. We should be retained to review the geotechnical aspects of the <br />designs and specifications. This review will allow us to evaluate whether we anticipated the design <br />correctly, if any design changes affect the validity of our recommendations, and if the design and <br />specifications correctly interpret and implement our recommendations. <br /> <br />E.2.b. Construction Observations and Testing <br />We recommend retaining us to perform the required observations and testing during construction as <br />part of the ongoing pavement evaluation. This will allow us to correlate the subsurface conditions <br />exposed during construction with those encountered by the borings and provide professional continuity <br />from the design phase to the construction phase. If we do not perform observations and testing during <br />construction, it becomes the responsibility of others to validate the assumption made during the <br />preparation of this report and to accept the construction-related geotechnical engineer-of-record <br />responsibilities. <br /> <br />