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SEP-29-2000 10: 17 P.03i06 <br /> ADEQUACY OF EXISTING GROUNDWATER MONITORING WELLS <br /> BW-2 and BW-4 are currently the upgradient monitoring wells ftzrthest west. They are located at <br /> the eastern edge of the majority of the area irrigated with wastewater_ The only upgradient data <br /> available west of the monitoring wells was from Temporary Borings B-4 and B-5_ Water from <br /> Boring B-4 had extremely high levels of sodium sulfate as can be seen in Table 1. Water from <br /> Boring B-5 also had relative elevated levels of sulfate and overall salinity. Due to the Iack of <br /> permanent monitoring wells upgradient of most of the irrigation area and the high variability in <br /> groundwater quality, Regional Board staff has requested additional permanent upgradient <br /> monitoring wells to comply with the intent of Title 27 requirements. <br /> Table 1. Construction Details for Existing Monitoring wells <br /> Elevation at MP Depth Screened <br /> Well (ft AMSL) (ft) Interval Condition <br /> WP-1 15-21 34 24-34 Good <br /> WP-2 16.33 29 18-28 Good <br /> WP-3 needs resurvey 18 8-18 Good <br /> WP-4 5.67 19 8-18 Good <br /> WP-5 29.06 42 27-42 Good <br /> WP-6 11.79 30 15-30 Good <br /> WP-7 16.64 103 80-100 Good <br /> WP-8 27.00 35 20-35 Good <br /> BW-1 5.42 3-13 Good <br /> BW-2 9.17 11-21 Good <br /> BW-3 4.59 93 70-90 Good <br /> B W-4 10.12 105 82-102 Good <br /> IP-1 6.04 26.5 16-26 Good <br /> IP-2 10.96 23 12-23 Good <br /> IP-3 11.69 28.5 18-28 Good <br /> September 15, 2000 2 Spreckels Tracy <br /> 201199-03techwkpin Technical Report and Work Plan <br />