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Preliminary Plat Application 15-3749 <br /> Crystal Bay Estates <br /> Page 2 <br /> 1.9 The applicant will be required to submit a Maintenance Agreement for a]] stormwater management <br /> structures and facilities. The agxeement should define maintenance responsibilities following <br /> completion of project, specify ty�es and frequencies of inspection and maintenance activities,and <br /> designate who will conduct inspection and maintenance activities. <br /> 2.0 ST�RMWATER MANAGEMENT PLAN: <br /> 2.1 Per NPDES requirements,any project that results in 1 acre or more new impexvzous surface at <br /> ultimate development must provide volume retention equal to i"runoff from the new impervious <br /> surfaces. Since the pxoposed development results in more than 1 acre new impervious surface,the <br /> plan must be 1'evised to provide required volume retention. <br /> 2.2 Proposed condirions must be revised to indicate ultimate development conditions. Drainage areas <br /> D1 and D3 must be revised to include proposed houses and driveways. In addition,the Proposed <br /> Hardcover table should be revised accordingly. <br /> 2.3 The proposed pond must provide 1,800 cf storage below the outlet for each acre draining to i� <br /> Calculations con£'irming sizing should be submitted. <br /> 2,4 The proposed pond is located within Wetland#2's buffer. Pond location should be adjusted so the <br /> predicted higb,warer level is outside tlie buffer. <br /> 2.5 Storm sewer calculations must be submitted to verify adequate sizing. <br /> 2.6 The sump should be removed from the pond oudet control structure. The inlet pipe shou.ld�1ow <br /> backward to pond to allow for future nnaintenance. The proposed weir will control the nornnal <br /> water level. <br /> 2.7 Trashguards should be included for all stvrm sewer aprons. <br /> 3.0 PREI.IMINARY SITE PLAN: <br /> 3.1 Site access is proposed via an extension oi Kantyre Lane. since Kintyre Lane is an existing cul-de- <br /> sac the City should consider the following: <br /> a. By eatending Kintyre Lane to serve the proposed deve2opment,the cul-de-sac will be over <br /> 1,500' in tength(City standards reqture maximum 1,000' length)with nv potential to establitsh <br /> a through corridor for future development. <br /> b, The proposed cul-de-sac will ser�e 131ots(City standards require maximum lO lots). <br /> c. City standards require a miniunum 28' paved width for roads serving 7 oz moz�e lots. Kintyre <br /> Lane was construeted at 26' wide and would be out of compliance with City standards. <br /> d. An agreement must be obtained from the Kintyre Home Owner's Association to cpnnect to <br /> Kintyre Lane. <br /> e. The existing cul-de-sac at the end of Kintyre Lane couJ.d remain in order to reduce <br /> development costs. <br /> f. An alternate route to serve the property could be provided through Outlot A of the Tamazack <br /> Hill Addition. At Sd' wide,the outlot has adequate width to accommodake a grivate road,and <br /> the road woald follow the e�cisting driveway serving 350 Stubbs Bay Road. This route would <br /> have very minimal impact on lot layout or tree removals,with only Lots 6 and 7 requiring <br /> adjustments. However,this route may result in minimal wetland impact to improve tlie <br /> driveway to private road standards. Also,availabi3ity of this outlot for private road use should <br /> be reviewed with the City Attomey and Applicant. <br /> g. If Outlot A of Tamarack Hill Addition i s not used for site access,what is the intended futtue <br /> use of this outlot7 The existing driveway to Lot 5 should be removed. The portion of this <br /> outlot not serving the adjacent property at 300 Stubbs Bay Road Notth could be re-vegetated <br /> with a native prairie seed mi�c, <br />