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water levels in fllis task was necessary due to well access linutations, presence of in-well wiring <br />and equipment, and depth to water. Explanations of each method with their pros and cons are <br />presented in Appendix A to assist others >11 deciding what equipment to use in the future. A <br />comparison of the sonic meter to other methods, made in Phase 2 Task 39, is also presented in <br />Appendix A. <br />1.1.2 Field Measurement of Autumn 2006 Water Levels <br />Phase 4 field water level measurements were collected during November 2006.Of fl1e 115 wells <br />targeted for measurement, 75 were to be physically measured by CDM and 40 measurements <br />were solicited from other entities. <br />Prior to conducting the field measurements, well owners or residents were contacted to obtain <br />verbal pernussion to measure their well. Up to two attempts were made to contact the owners <br />or residents via telephone in the weeks before the water level measurement field program. Of <br />the 75 candidate wells to be measured in the field, eight well owners were not contacted <br />because a current phone number was not found or because fl1e owner was not reached after two <br />contact attempts. A DWR employee accompanied CDM staff i11 t11e field to complete fl1e <br />measurements for these eight wells. <br />Seventy-one of the 75 wells identified for measurement were visited, and data were successfully <br />obtained at 70 of these wells as shown in Table 1. A total of five water level measurements <br />could not be obtained during this collection program for the following reasons: <br />• Well abandoned due to property redevelopment (1) <br />• Well was being repaired (2) <br />• Access denied (1) <br />• Unable to obtain definitive measurement (1) <br />Notes made by the DWP during previous spring measurements and notes from contacting the <br />well owners were reviewed to identify specific instructions for each well. If requested by the <br />well owner, the measurement was scheduled when the well owner could be present. A letter <br />describilzg the SPDSS and the autunuz water level collection process was provided to each well <br />owner, either in person or by leaving the letter at fl1e door if no one was Home. A copy of the <br />letter is presented >11 Appendix B. <br />During the field activities, detailed notes were taken to record directions to the well, updated <br />contact information for the well owner w11en possible, a description of fl1e measuring point, <br />measurement method utilized, and measurement results. <br />Measurement results for Phase 4 are presented in table form in Appendix C. If a measurement <br />was not obtained for a well, fl1e reason is explained in the table. T11is table is sorted first by <br />aquifer and t11en by the HydroBase identifier. The locations where autunul water level <br />measurements were obtained are shown in Figure 2. The autunm 2006 measurements were <br />added to data downloaded from HydroBase and used to create water level hydrograplls for <br />eac11 well. These are presented i11 Appendix D and discussed in Section 1.2. <br />SPDSS Phase 4 Task 39 Technical Memorandum-Final <br />O~i20%2008 <br />