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City of Arden Hilis <br />4 a i+�''1�� A13gUS1 �, 2� � I <br />� �i3gC 2 <br />> >. i <br />water that co�ld be contra�Ied. Bolton & Menlc will prepare preiirr�inary cost est�mates associated with <br />the various options. One meet�ng with the Ciry staff has been included for discussion of the options. <br />Task 2— Collect Topo�raphie Data of Critrcal Informatiolz <br />Bolton & Menk will cc�Ilect pond and road secEion overf7ow e]evations and critical ground e3evations to <br />enhance the existzng base rr3ap information. Catch basin rim and invert elevations along with storm <br />sewer pipe size ir�formation wi]I also be collected. The objective af this task is to complete a more <br />acc�arate and comprehensive digitaI map of the townhome developments which can be used in support <br />af Ta€sks 3 and 4, betow. <br />Task 3— A�7al},ze Existi�7,2 Storrn Water Corxveyance .Svste�n <br />Bolton & Menk wiEl ereate a camputer modei of the existing drainage system asing the information <br />gathered in Task 2. The model created will be used to identify a�y apparent defciencies in the existing <br />storm sewer pipe system based upon a 10-year storm evenE and analyze potential flaoding iss�aes ta <br />townhomes based upon a 140-year, 24-hour storrn event_ The existing system witl also be mode�ed <br />with the low point street catch basins blocked along Arden View Drive, sim�lating the canditions that <br />oecurred during the recent construction, to see whaE the resvlting ffood conditions would be for a 4.5" — <br />24-hour starm event. One meeting with City staff has been inc�vded �or ciiscussion of these results. <br />7�ask 4— Model Stor�aa Water If�zproyemenf DesiQr� Obtians <br />This task wiIl involve utilizing the computer model deveIoped in Task 3 and evaivating the <br />effectiveness of the Task l options. Additional alter�atives will be looked at to deiermine if other <br />irnprovernents could be made ta the storm sewer sysEem based ugon a 10-year design starrr�. <br />Emergency o�erflow optio�s wilI be analyzed based upor� a la0-year, 24--hour storm event. Bolcon & <br />Menk wil] prepare prelirrzinary cost estimates associated with the �arious options. One meeting wit� <br />City staff has been incl�ded for discussion of these results. <br />ProAosed Fees <br />BUlton & Menk proposes to complete the scope c�f work as described above for the following fees. <br />Task 1: Develop �ptions for Storrn Warer I�npravements $ 3,500 <br />Tusk 2: Collect 7"opographic Dara nf Critical Infonnatrort $ 4,900 <br />1'ask 3: A1talyze Existi�7g Stonyi Wuter Conveyance S}-stern $ 4,000 <br />Task 4: Model Sto�-rtz Warerh7rproe�ement Design Optiotrs 4 500 <br />TUTAL <br />$16,900 <br />The itemized costs for the four tasks are estimates. Boltan & Menk proposes to complete alI tasks for a <br />not to exceed lump surr� cost c�f $16,9Q�. Attached are the Tenns of Proposal. lf you find this proposal <br />satisfactory, your signat�re of this proposal will constit�te acceptance of the terms outiined and your <br />aui}aority for us ta proceed. Please call if you wish to discuss this proposal. WE look forward to <br />providing these professianal engineering services to yo� on this project and appreciate your considerataon <br />of Bolton & Menk, Inc. <br />N:IPROPOSALS1Ardcn Hills120I1 7'ownhouse VillageslArden Hills Drain:��?c Pruposal.doc <br />