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RCWD Permit Number 14-104 The applicant must submit the appropriate surety amount of $27,400 ($4,500 for 8± acres of disturbed area, and $22,900 for 45,840± ft3 of stormwater management features) along with an executed escrow agreement acceptable to the District. If the applicant desires an original copy for their records, then two original signed escrow agreements should be submitted. The applicant must provide the first $5000 in the form of a check and has the option of providing the remainder of the surety amount in the form of a check or a Performance Bond or Letter of Credit. Stipulations: The permit will be issued with the following stipulations as conditions of the permit. By accepting the permit, applicant agrees to these stipulations 1. An as -built survey of all stormwater BMPs (ponds, rain gardens, trenches, swales, etc.) is to be submitted to the District for verification of compliance with the approved plans before return of the surety. Exhibits: 1. Plan Set (12 pages), dated 12-1-2014 and received 12-9-2014. 2. Permit Application, dated 12-9-2014 and received 12-9-2014. 3. Checklist of Permit Submittal Requirements, undated and received 12-9-2014. 4. Application Fee, dated 12-8-2014 and received 12-9-2014. 5. Stormwater Report, dated 12-1-2014 and received 12-9-2014. Findings: 1. Description — The project involves the construction of two new buildings and an adjoining parking lot and sidewalk on a previously undeveloped lot (0± acres of impervious surface). The project will result in construction of 5.74± acres of new impervious surface, and the disturbance of 8.0± acres. The site will drain to two stormwater ponds (one on the north edge of the property, one on the west edge), and ultimately to Valentine Lake, which is the resource of concern. The applicant has submitted an application fee of $5,250, which corresponds to the fee for >5 acres of new or re -constructed impervious surface area, and 2.5 to 10 acres of disturbed area. 2. Stormwater — This project will result in a total of 5.74± acres of new impervious surface and 8.0± acres of land disturbing activity. The Rule C.6(c)(2) Water Quality Treatment Volume (hereafter Volume) requirement t is 1.1 -inches x 250,034 ft2 = 12 in/ft _ 0.5 TP Removal Factor totaling 45,840± ft3. The Volume requirement is proposed to be met through two stormwater ponds with filtration benches, which are described in the table below. Proposed P:C?escription Locatiort . Required NURP: Piovided'Deaci Dead Stofage" Storage North Basin Northeast corner of 23,811± ft3 28 875+ ft3 7,987 ft2 surface area) property. South Basin Western corner of 27,420± ft3 37,336± ft39,855 ft2 surface area) property. Total 51,231± ft3 66,211± ft3 The applicant proposes to provide the required stormwater treatment for the project by using 2 stormwater ponds with filtration shelves. Approximately 1.1% of the stormwater from the site's proposed impervious surface will leave the site untreated. It is not feasible to route this stormwater to one of the proposed BMPs and additional TSS removal is not practicable. The filtration shelves will have a 4" perforated PVC drain -tile buried in approximately 20 inches of engineered soil, will be lined with a layer of geotextile, and will filter approximately 22,769 ft3 of Rice Creek Watershed District Page 2 of 3 1/12/2015