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Page: 5 <br /> <br /> <br /> <br />the city engineering department for insertion into the subdivision plans. The watermain utility <br />plans will be further reviewed and finalized as part of the final construction plans. <br />4. The Preliminary Plans depict PVC watermain rather than the city standard DIP watermain <br />materials as the developer is seeking flexibility to use PVC as an alternate material. At the direction <br />of the city council, staff is currently reviewing the merits of changing the city watermain standards <br />and will be presenting staff recommendations on the matter at a future council meeting. <br />5. No watermain oversizing reimbursement is applicable for this development. <br />6. Minimum 30-foot easements centered over the pipe/hydrant will be required when not located <br />within the public right-of-way. Easements must be free from all encroachments, including <br />retaining walls, trees, fences, small/dry utilities, or storm water management BMPs. Dedicated <br />utility easements must be shown on all site, grading, utility, and landscape plans when submitting <br />a Preliminary and Final Plat application. <br /> Additional easements may be required, pending the final design and layout for the PRV <br />location, if not fully contained within the right-of-way. <br /> <br />WATEWATER MANAGEMENT / SUBSURFACE SEWAGE TREATMENT SYSTEMS (SSTS) <br />1. The proposed development is located outside of the city designated Municipal Urban Service Area <br />(MUSA) for sanitary sewer service. The developer is proposing private individual on-site septic <br />systems for each Lot (SSTS). <br />2. Individual on-site septic systems are permitted by Washington County and must contain both a <br />primary and secondary site located on each Lot. For subdivision planning purposes Washington <br />County requires a minimum of 10,000 square feet of suitable soil for each lot to represent both <br />the primary and secondary locations. <br />3. The Preliminary Plat application includes a letter from Washington County Public Health & <br />Environment, undated, that states preliminary soil testing conducted on site appears to have the <br />required 10,000 sf of suitable soil for each lot. The letter further notes that the soil testing <br />conducted is preliminary, and that for permit issuance, a minimum of four (4) soil observations <br />encompassing the proposed sewage treatment area will be required in accordance with Section <br />9.5 of the Washington County Development Code, Chapter Four, Individual Sewage Treatment <br />System Regulations (Washington County Ordinance #206). <br />4. Septic system site locations must also meet setback requirements, including 10-feet from <br />property lines, 20-feet from structures (building pads), 35-feet from all stormwater BMPs, and 75- <br />feet from the delineated edge of wetlands. Setbacks must be noted on the site and grading plans. <br /> Spot elevations must be added for the basin grading 1SW and will be used for as-built <br />verification prior to acceptance of improvements to ensure a minimum 35-ft separation is <br />maintained from the lot L10B1 septic system location and basin 1Sw. <br />5. In addition, septic system site locations must take into account sufficient maintenance access for <br />the city and its contractors to own and maintain public drainage systems. Access for inspections <br />and maintenance work will require vehicle and equipment access. Sufficient separation is <br />necessary to ensure vehicle traffic does not encroach drainfield areas nor future reserved <br />drainfield areas. Site plan revisions may be required as the preliminary site and grading plans are <br />finalized. <br /> Revise primary and secondary septic system locations for lots L5B2 and L6B2, ensuring <br />minimum 20-feet separation from the proposed rear yard storm sewer pipe.