2009-10-16_PERMIT FILE - M2009082 ‎(13)‎

• Permit No: M2009082
• IBM Index Class Name: PERMIT FILE
• Doc Date: 10/16/2009
• Doc Name: Attachment G-4, Preliminary Drainage Report
• From: Lafarge West, Inc.
• To: DRMS
• Media Type: D
• Archive: No

For existing conditions, the sum of all drainage basin areas is 841 acres. Direct precipitation on the
reclaimed unlined ponds and the sum of the subbasin areas that would be captured by the unlined
ponds is 278 acres. The reclaimed site will reduce the contributing drainage area to approximately
67 percent of the historic area without increasing the imperviousness of the contributing drainage
area.
- 15- Revised Preliminary Dminage Report.docx