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River Islands Development LLC - 2- 26 November 2014 General Order 2003-0003-DWQ-0128 The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition, revised October 2011 (hereafter Basin Plan), designates beneficial uses, establishes water quality objectives, contains implementation plans and policies for protecting waters of the basin, and incorporates by reference plans and policies adopted by the State Water Resources Control Board. Pursuant to §13263(a) of the California Water Code (CWC), waste discharge requirements must implement the Basin Plan. PROJECT DESCRIPTION Initial grading of the property began in 2005, and included the excavation of two lakes in the southeastern portion of the development. Current land development and construction activities will include the excavation of seven additional lakes, beginning in December 2014. The location and sizes of the planned lakes are summarized below: Lake ID San Joaquin County Approximate Design Depth APN(s) Size (Acres) (feet bgs') Lake No. 3 213-30-011 and 213-31-12 27.6 28 Lake No. 4 213-31-10 2.2 15 Lake No. 5 213-31-10 2.7 15 Lake No. 6 213-31-10 4.3 15 Lake No. 7 213-31-10 and 312-31-12 12.5 15 Lake No. 8 213-31-09 and 213-31-10 4.0 15 Lake No. 9 213-31-10 9.1 15 ' Feet below'ground surface from rough grading. --Groundwater monitoring is currently conducted at River Islands using a series of monitoring wells associated with recycled water Use Areas regulated under Waste Discharge Requirements (WDRs) and Master RecyclingPermit Order R5-2004-2006-0094, which was adopted on 22 September 2006. Groundwater monitoring data indicate that the depth to groundwater near the planned lake excavation areas ranges between 8 and 10 feet below ground surface (bgs). Because the lakes will be excavated to depths ranging from 15 to 28 feet bgs, dewatering will be necessary. A series of shallow groundwater extraction wells will be installed near each of the planned lake areas and pumped to maintain adequate drawdown during excavation. Dewatering is estimated to range from 2 to 8 million gallons per day and anticipated to take approximately five to six months duration. Extracted groundwater will be discharged into a bermed discharge evaporation/percolation basin, where it will also be stored for use as dust control during construction activities. The water will not be treated or neutralized. The dewatering discharge area consists of a nearby 86 acre parcel (APN 213-30-06), which is owned by River Islands LLC. The discharge area is surrounded by a four foot high earthen berm. Assuming 2-feet of freeboard, the dimension of the discharge area corresponds to an approximate storage capacity of 750,000 cubic-feet or 56 million gallons.