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ENGEO <br /> INCORPORATED <br /> FOREWORD <br /> This Groundwater Monitoring Well Installation, Sampling and Analysis Workplan (Workplan) <br /> provides supporting information for the Mountain House Community Services District <br /> (MHCSD) application for Waste Discharge Requirements for solids handling operations at the <br /> Mountain House Water Treatment Plant (MHWTP). The MHWTP is located at the northeast <br /> corner of South Kelso and Byron Roads in San Joaquin County, California and is generally <br /> bounded by vacant land with Kelso Road to the east, and Southern Pacific railroad tracks and <br /> Byron Road to the southwest (Figure 1). Expansion of the water treatment facilities is currently <br /> underway. <br /> This study is being conducted to gather environmental data to establish background groundwater <br /> conditions. The MHCSD has operated water treatment facilities at the site since 2003 with a <br /> permitted capacity of 5.0 million gallons per day (mgd). The expanded facilities will have an <br /> initial capacity of 15 mgd, with a planned ultimate capacity of 20 mgd. This Workplan has been <br /> prepared by a Professional Geologist or Civil Engineer licensed by the State of California and in <br /> general conformance with Attachment D, "Requirements for Monitoring Well Installation <br /> Workplans and Monitoring Well Installation Reports," prepared by the Regional Water Quality <br /> Control Board. <br /> PURPOSE AND SCOPE <br /> The purpose of this Workplan is to present proposed monitoring locations and investigation <br /> protocols specific for the MHWTP area being studied. The objective of the Workplan is to <br /> provide baseline information under existing conditions to be utilized in the development of a <br /> groundwater monitoring program. <br /> 4943.4.640.01 <br /> April 17, 2007 1 <br />