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Inwood Consulting Engineers, Inc. <br />870 Clark Street <br />Oviedo, FL 32765 <br />Attention: Mr. Mark Ellard, P.E. <br />ATTACHMENT <br />Subject: Proposal for Supplemental Geotechnicai Engineering Investigation <br />ANCHOR ROAD STORMWATER IMPROVEMENTS <br />Ponds 1 and 2 Retaining Walls <br />Seminole County, Florida <br />GEC Proposal No. 3762GS1 <br />Dear Mr. Ellard: <br />Geotechnical and Environmental Consultants, Inc. (GEC) is pleased to present this <br />supplemental proposal to provide geotechnical engineering services for the above -referenced <br />project. This proposal is based on the documents provided to us by you on December 17, <br />2008. The purpose of this investigation will be to explore soil and groundwater conditions and <br />use the information obtained to provide geotechnical engineering recommendations for the <br />design of the proposed retaining walls. This proposal presents our understanding of the <br />project, our recommended scope of services and a cost and schedule for providing those <br />services. <br />Ponds 1 and 2 are located along Anchor Road between Stations 110+00 to 115+65 and <br />Stations 116+70 to 119+55, respectively. Geotechnical services are required to explore soil <br />and groundwater conditions on the west side of each pond to assist with the design and <br />installation of retaining walls so that the existing sloped pond sides can be removed and the <br />pond capacity can be increased. Based on the figures provided by Inwood, the wall height for <br />both ponds is estimated to be approximately 15 feet. This height is based on the pond bottom <br />elevation of +76 ft, NGVD and the an estimated ground surface elevation of approximately <br />+90 to +91 ft, NGVD. Based on this wall height, it is likely that sheet pile walls will be the <br />most cost effective option. However, GEC will also evaluate gravity walls and concrete <br />retaining walls as possible options. <br />Our recommended scope of services includes the following: <br />Mobilize truck -mounted drilling equipment. <br />910 Lahe BaldWin Lane, Oplande. FL 32814 OFFICESIN OR UNDO AND KISSIMMEE <br />yy pp ®p 1 <br />X/fig -1 ■ M � -■ <br />