PD BACKGROUND REPORT (SPP-21-228)

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for the school use. Per staff's conversation with DON-Wastewater Division, the calculations should include information on maximum number oj'users {students and faculty), number of proposed restrooms (toilets & sinks), and information related to anticipated wastewater produced by the proposed cafeteria. Please summarize the_indings oj'the calculations in the wastewater section of the resubmitted application, Exhibit F provides water calculations prepared by Island Engineering LLC. for the proposed use.Total water use and thus wastewater production from the campus is estimated at 6,560 gallons per day, which based on the designs and calculations provided in Exhibit E, each of the existing buildings is equipped with three(3) 1,200 gallon septic tanks. The middle building(B on conceptual site plan) IWS absorption field is designed for 2,500 gallons per day and the eastern building(C on conceptual site plan) IWS absorption field is designed for 3,400 gallons per day and includes a grease interceptor to support the proposed cafeteria Kitchen. Further calculations in Exhibit E indicate there is sufficient land area to accommodate another similarly sized IWS system to handle wastewater generated by the proposed building C, as the total of 6,560 gallons per day is considerably less than the maximum allowed by DDH given the size of the parcel (less the building footprints), which is 7,667 gallons per day for the parcel. 3 Slate Department of'Transportation (DOT) reviewed the draft Traffic Impact Analysis Report MAR).submitted with the subject application: and by letter dated December R, 2020. requested a significant amount of additional information before the TIAR would be accepted. Your application indicates that you are in the process of'addressing these issues and will be resubmitting a new draft TIAR to DOT. Before we can accept this application as complete, we will need DDT concurrence that the final TIAR is complete and acceptable. Please also summarize the findings af'the accepted TIAR in the traffic section of the resubmitted application. After some discussion by email relating to the potential for queueing on Orchidland Drive then impacting traffic flaw on 130, DOT commented the"TIAR is okay." We have since sent a request for written confirmation along with any requirements DOT would require given the planned roundabout at the intersection. (Unnumbered comment) Finallv,please note that if the applicant is unsuccessful in obtaining County water to address the school's potable and fire suppression needs, they will likely need to redesign the faciliry lavout to accommodate potable water and,fire suppression tanks on-site. On the conceptual site plan for the campus there are currently two (2)twenty-foot diameter water tanks depicted near building A. Additionally,there is ample room on the west side of the parcel where playgrounds and fields are currently shown, should additional water storage be necessary.