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<br />'The 2009 progrmn consists of overlay projects on approximately 1.85 miles of City <br />stn;ets. Streets proposed for overlay will receive H one and one half inch byeI' of <br />bitllminous wear COUfSU, Again, the Public Works department willl'cpmr failed arcas <br />prior to the overlay, This year thu proposed overlay project will be limlt~d to; <br /> <br />. The Hunters Hill subdivision located cast of CR 57 and soutb of Sunwood Drive; <br />and <br />. BurthelsRurn R.ivcr Acres 21\d Addition which is locuted nOl"th of the Boys Scout <br />Camp <br /> <br />Assessment Policies: <br /> <br />This year is the second year of a seven year program to phase out the previous policy of <br />assessing property owners 50011) of the sea1coating project cost. The 2009 sealcoating <br />project will assess 36% of the tottLl cost. This will decrease by 7% per year until the entire <br />assessment on sealcollting will be' eliminated in 2014. <br /> <br />The aSSCSS111ent policies for seaIcoating/ crllckfllUng and bituminous overlays hus <br />eval ycd into the list 0 f assessment procedures attached to this case. This policy has been <br />modit1ed and expanded over the years us needed. The Committee may wish to review <br />these policies, <br /> <br />Technical Program Changes: <br /> <br />Pea gravel has been historically llsed as the seu1coat cover aggregate on the City's <br />programs, ft is the lowest cost cover aggreg~tte available. Bec~Lllse it not as likely to lie on <br />its most stable side, it tends to be more susceptible to plow damage and being rolled by <br />turning tires which can lead to tracking complaints. Beginning last year in 2008 crushed <br />aggregate vvas specitled for cover aggregate. While slightly more expensive this <br />aggregate becomes embedded on its t1attest side and is less prone to stripping and <br />tracking. Staff did learn that from the 2008 program experience that where heavy truck <br />tntftic or a high volume of turnirig movements were encountered Hushing of the <br />bituminou~ (bituminous covered the entire aggregnte particle making the pavement black <br />in appeanlnce) occurred. Although this is an aesthetic issue which has since mitigated <br />itself by thdingof the exposed bituminous. statT has learned atter consulting with the <br />MnDot ltlb to modify its specification by using a slightly larger sized aggregate along <br />with a slightly h.cavier applic(\ti<)O of bituminous. A revised specitlcation will be 1.lsed on <br />the high volumeMSA roads that arc to be seal coated this year. <br /> <br />A second moditication thtlt proved successful in the 2008 program which will tlgain be <br />repeated this year is the use of a polymer moclitled asphalt emulsion on cuI de sacs and <br />MSA streets. The polymer creates u strong electrical bonel between the oil and the <br />aggregate which greatly increases the adherence of the chip to the street surface. The cost <br />of polymer modified :'lsphalt is about 25(l1J higher than regular CRS 2 oil so its use will be <br />limited to higher spee9 MSA Streets <br /> <br />8 <br />