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Mr. Marshall Cloud <br /> July 20, 2006 <br /> Page 2 <br /> Investigation Work Plan and should be referred to as catch basins in this <br /> report for consistency. <br /> 3.) Page 2-3, section 2.3.0.1, fourth sentence; Please state the lithologic layer <br /> containing the hardpan layer and expand the definition of locally used this <br /> instance. <br /> 4.) Page 2-5, section 2.3.2.0.1; The section should note that the increase in <br /> ground water elevations measured in 3Q05 compared to the previous year is <br /> due to the higher than normal rainfall totals for 2005 in conjunction with <br /> extensive surface water discharge at DDJC-Sharpe. <br /> 5.) Page 3-4, section 3.4.1.1, General Head Boundaries; According to section <br /> 3.4.1.2, the South San Joaquin Irrigation District Canal (SSJIDC) along the <br /> eastern boundary of DDJC-Sharpe was simulated with the MODFLOW river <br /> package but was not discussed under the General Head Boundaries section. <br /> Since section 3.4.1.1 discusses the San Joaquin River and French Camp <br /> Slough head boundaries, a discussion of the SSJIDC as a general head <br /> boundary should made in section 3.4.1.1 prior to calculation discussions in <br /> section 3.4.1.2. <br /> 6.) Page 3-5, section 3.4.1.4; To aid in the interpretation of hydraulic recharge <br /> values it would be useful to conduct an independent verification of localized <br /> recharge through the collection and analysis of chloride monitoring data in <br /> ground water. Monitoring for the presence of chloride in ground water will <br /> help identify or verify the various sources of ground water recharge at DDJC- <br /> Sharpe. <br /> 7.) Page 3-6, section 3.4.1.8, first sentence; This section should mention DDJC- <br /> Sharpe's off-site extraction well (EW) EWCC3. This off-site extraction well's <br /> goal is to pump continuously to maintain hydraulic control of the existing <br /> Central Area Trichloroethene ground water plume. <br /> 8.) Figure 3-4, Calibrated Net Recharge; The figure is unclear where the DDJC- <br /> Sharpe site boundary is located amongst the various recharge boundaries. It <br /> would be helpful to outline the DDJC-Sharpe site boundary in another color to <br /> differentiate it from the various recharge cell boundaries. <br />