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a Flor Ranch: S12ecial Report { STORM DRAIN i The storm drain master plan for the area calls for the construction of various trunk lines throughout Linden which will ultimately discharge into a retention pond situated south of State Route 26 on the Santos property (see Exhibit D). The basin will be adequately sized to act as a regional facility and could serve the dual purpose of a retention basin and community park. At this point the property has yet to be acquired and no improvements for the basin have been made. When the Flor Ranchro'ect is ' p ) developed, it will include the construction of a 33 storm drain line transitioning to a 48" line within the Ione Street extension in compliance with the Storm Drain Master Plan. Given that the pond on the Santos property will be improved at some point in the future, it is likely the Flor Ranch property will need an interim design to handle onsite runoff. The Tentative Map proposes to set aside Lots 58 through 61 and 70 through 73 as a temporary percolation basin to accept the runoff volume generated from the project (approximately 2 acres). At the time the regional facility is available or the project reaches its buildout capacity, the Flor Ranch subdivision will tie into the Master Plan system and eliminate the temporary basin�which will ultimately become residential lots. Included in this report are the calculations determining the size of the temporary percolation basin within Flor Ranch (see Exhibit E). The calculations indicate that the entire project could be served by the temporary basin, thus enabling the project to move forward in advance of the installation of the regional facility.', It is anticipated that the temporary basin would be eliminatedprior to the complete buildout of the subdivision. However, its design has been conducted to account for delays in improvements to the regional facility. I i� i 4 i. I I