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HM M MASTELLER & MOLER, INC. 1655 27th Street, Ste. 2, Vero Beach, FL 32960 <br />— CIVIL ENGINEERS — (772) 567-5300 <br />EXHIBIT A <br />Under Addendum # 1 for th'e 45th Street Roadway Improvements Project, in coordination with Indian <br />River County's underground exploration firm, Southeastern Surveying, Masteller & Moler, Inc. (MM) has <br />reviewed the results of existing cover conditions for the County's water main system along the project <br />route. As a result of the completed Addendum # 1 underground exploration, it was determined the <br />existing water main depth for much of the length of the project between 58th Avenue and 43rd Avenue <br />does not provide adequate cover conditions. As such, the County Utilities Department has decided that <br />it will be necessary to replace the existing water main with a new water main. The design and permitting <br />of the new water main will require the following scope of services: <br />Task K — Land Surveying: We shall have Masteller, Moler & Taylor, Inc. perform additional route <br />surveying on the south side of 45th Street to locate the existing conditions in the vicinity of the <br />water mains that will need to be connected to the new water main (to be designed under Task L <br />herein). <br />Task L — 45th Street Water Main Replacement Design: It has been determined the County's <br />existing water main on 45th Street from 57th Avenue to 43rd Court does not have proper cover <br />conditions as revealed in the table below. <br />Test Hole # <br />U.A. Station <br />& Offset <br />Existing Grade (ft) <br />Existing Depth to <br />Existing Utility (ft) <br />TH15 <br />304+97, 32' L <br />21.60 <br />1.50 <br />TH17 <br />306+66, 32' L <br />21.40 <br />1.55 <br />TH18 <br />309+32, 32' L <br />21.70 <br />2.00 <br />TH19 <br />311+77, 32' L <br />22.60 <br />1.20 <br />TH2O <br />314+99, 32' L <br />22.40 <br />1.60 <br />TH21 <br />316+58, 32' L <br />22.30 <br />0.8 <br />TH22 <br />320+16, 31' L <br />22.50 <br />1.10 <br />TH26 <br />323+48, 32' L <br />22.40 <br />1.10 <br />TH27 <br />326+77, 33' L <br />22.50 <br />2.60 <br />TH28 <br />327+27, 60' L <br />22.60 <br />2.75 <br />TH29 <br />331+97, 32' L <br />22.30 <br />1.55 <br />TH30 <br />334+16, 31' L <br />23.00 <br />2.35 <br />TH31 <br />337+20, 31' L <br />23.30 <br />2.20 <br />TH32 <br />339+30, 32' L <br />23.20 <br />2.10 <br />TH33 <br />343+94, 30' L <br />23.20 <br />1.50 <br />TH34 <br />345+17, 31' L <br />23.40 <br />1.85 <br />TH35 <br />347+25, 27' L <br />23.10 <br />2.55 <br />Design services shall be provided to depict a new water main to be constructed along this portion <br />of the project route. The proposed new water main design elevation shall be depicted on the <br />cross-sections for the 45th Street Roadway Construction Plans. <br />The new water main will be designed to have extensions to the north of 45th Street at eight (8) <br />Page 1 of 2 <br />68 <br />