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<br />Memorandum <br />September 4, 2002 <br />Page 3 <br /> <br />. <br /> <br />Options <br /> <br />Temporary Option <br /> <br />The temporary solution of drawing the lake level down is to install portable trash pumps and temporary <br />above ground piping, The best route for the temporary piping is to run it through Cummings Park and <br />outlet into a catch basin in the W ynerest Court cul,de,sac, The City of Arden Hills does not own <br />equipment or piping large enough to pump the Kalth Lake down in a reasonable amount of time therefore <br />equipment and piping would have to be rented for 3 to 4 weeks and monitored closely by operations and <br />maintenance staff. It is estimated the cost for renting temporary pumping equipment and piping for 3 to 4 <br />weeks will be approximately $8000 to $9000, <br /> <br />Permanent Option <br /> <br />As recommended in MSA's 1996 analysis a forcemain system conneeting from the south end of Kartb, <br />Lake to thc storm scwer system in Wyncrest Court through Cummings park would be the prefened <br />alternative bccause it is the lcast expensive alternative and could be completely constructed within City <br />Property, <br /> <br />( MSA's report reeommended a pumping system which could draw down Karth Lake 2' in a 96 hour <br />period, We believe that the draw down time could be extendcd without any delIimental effects and would <br />allow for a smaller diameter forcemain and smaller pumps which would in turn lower the costs of a <br />potential pumping system, It is recommended that a submersible pump be used similar to the pumps in <br />sanitary lift station #3 for the compatibility of equipment, parts and maintenance, <br /> <br />It should be noted that MSA's cost estimate did not have any budget for site restoration such as turf <br />replacement or pavement repairs, which could be extensive in thc open trench pipe installation they <br />proposed, The cuncnt estimated cost is outlined as follows: <br /> <br />Table 3 - Preferred Option Revised Cost Estimate <br /> <br />4" HDPE Forcemain Directionally Bored (700 LF) <br />Connect to Existing Manhole <br />Pump Manhole <br />Clearing and Grubbing <br />Site Restoration <br />Pump Control Panel <br />10 HP Submersible Pump <br />Total <br /> <br />$15,500 <br />$1,000 <br />$5,000 <br />$2,000 <br />$6,000 <br />$5,000 <br />$8,000 <br />$42,500 <br /> <br />4 <br />