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DUNKC68CROER . Fort Lauderdale <br /> . Port Saint Lucie <br /> engineering & testing , Inc. . Sarasota <br /> AVerrocan coMPANY • West Palm Beach <br /> Indian River County August 6, 2013 <br /> 180127" Street Project No . PSL-1113093054 <br /> Vero Beach, Florida 32960 (PSL-09-3054 BG10.4) <br /> Attention: Mr. Michael D . Nixon, P.E . . . . via a-mail (mnixon@ircgov. com) <br /> Subject: Construction Materials Testing Services EXH1131T <br /> 66th Avenue Roadway Improvements — Phase II <br /> Indian River County, Florida <br /> Dear Mr. Nixon. <br /> We respectfully submit this changer order request for Dunkelberger Engineering and Testing, A <br /> Terracon Company, to Indian River County for the above referenced project to cover the costs <br /> associated with the following remaining work as provided by Mr. Don Keith with the County. <br /> In-place density testing during backfilling of 22 drainage structures. Estimate 132 in- <br /> place density tests based on an average depth of 6 feet at bottom. <br /> In-place density testing during backfilling of the 6,527 lineal feet (LF) of storin pipe . <br /> Estimate 738 in-place density tests based on a production rate of 80 LF per day and an <br /> average depth of 6 feet at invert. <br /> In-place density testing for 8 , 100 LF of roadway/embankment fill. Estimate 120 in place <br /> density tests based on a testing frequency of one test per 500 LF and an embankment <br /> thickness of 3 feet. <br /> - In-place density tests for the 11 ,600 LF of stabilized subgrade and base course layers. <br /> Estimate 160 inplace density tests based on a testing frequency of one test per 500 LF <br /> (per direction) and a total of 31if9s (I lift of subgrade and 21 yls of base). <br /> In-place density tests at the subgrade for the approach slabs, curb pads, and sidewalks <br /> prior to concrete placement. Estimate 150 in-place density tests. <br /> Laboratory testing: (1 ) Estimate 15 Limerock Bearing Ratio (LBR) tests for stabilized <br /> subgrade (one per 1 ,000 LF) and base course (one per 4,000 LF) within the roadways; (2) <br /> Estimate 10 laboratory moisture-density relationship (Proctor) tests; and (3) Estimate 80 <br /> compressive strength tests of concrete cylinders. <br /> The changes to the Contract result in an increase of $42,060.00, as shown in Table 1 on the next <br /> page, necessary to cover the remaining work, providing for a contract total of $ 127,557 . 00. <br /> State of Florida Board of Professional Engineers Authorization No. 6870 <br /> Toll Free (877) 643.6832 <br />