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02/23/2007 10: 26 9164644780 CVRWQCE t1AUL eJI rJu <br /> _ 2 _ 28 February 2007 <br /> Tti",essrs. Silva and Giiton <br /> Please address the following items: <br /> 1. The workplan uses different names for the land application areas and recycled water <br /> storage ponds, Please revise all references so that they are consistent with the <br /> nomenclature used in the WDRs. <br /> 2. Please submit a revised Plate 1 that presents the proposed well locations. Please <br /> address the following comments: <br /> i. We understand that you may request changing the location of Basin No, 4 to the <br /> northwest portion of the development. As described above, moving the basin may <br /> be allowed as part of the hearing for any flow rate increase over 55,000 gallons per <br /> day (gpd). It may also result in the need for additional groundwater monitoring wells, <br /> ii. The monitoring network needs to compare groundwater upgradient of the land <br /> application areas with groundwater under or downgradient of the land application <br /> areas. Please revise Plate No. 1 accordingly. <br /> iii. Wastewater ponds always require groundwater monitoring wells, Please locate <br /> groundwater monitoring wells intended to specifically monitor wastewater ponds <br /> within 50-feet of the ponds. <br /> iv. Because groundwater flow directions are uncertain, and may change with the San <br /> .Joaquin River stage, more than one background groundwater quality well may be <br /> appropriate, <br /> v. If groundwater flow directions are different than anticipated, additional groundwater <br /> monitoring wells may be required. <br /> vi. The proposed well located at the southeast corner of the development appears to be <br /> located on the neighboring property. Please clarify that location. <br /> 3_ Please describe how groundwater TDS concentrations will be determined in all areas <br /> proposed for wastewater application. You may elect to only investigate Phase I land <br /> application areas (Nos. 1, 2, and 3) or investigate any number of land application areas. <br /> 4. With regard to the well construction, please address the following issues; <br /> i. The proposed well construction includes a 15-feet long screen and a 3.5-feet long <br /> sanitary seal. This arrangement does not maximize the sanitary seal. Consider <br /> using a 10-feet long well screen to increase the depth of sanitary seal. This may be <br /> an important issue considering the sandy nature of the native soils and the historic <br /> detections of bacteria in site wells. <br /> ii. Because this hydrogeologic investigation is not concerned with the presence of <br /> floating non-aqueous phase liquids (such as gasoline), it is not critical that the screen <br /> interval intersect the air-water interface. Consider constructing the wells slightly <br /> deeper to maximize the sanitary seal. <br /> iii, The well casing bottom plug is not described; please use a threaded cap for the <br /> bottom of the well casing or secure a slip cap with stainless steel screws. Please <br /> submit a revised Figure 6 showing the change. <br /> iv. The disinfection procedure described in the workplan is generally acceptable; <br /> however, a list of wells to be disinfected was not provided. Finding No. 51 in the <br /> w tiiaff 0bricnl bm JnnquimQak an t.nke siwc 7p 1'd2 n-d, <br />