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Administrative Draft Environmental Impact Report <br /> Gill Medical Center Project <br /> These values are consistent with the range of transmissivity values described in the GSP (ESJGA 2019), as <br /> discussed above. <br /> The data from the nearest monitoring point (AW-1 on Figure 4.12-5, 186 feet from the test well) indicates <br /> that the maximum effect of pumping at this distance was 0.35 foot, or approximately 4.2 inches. At the <br /> more distal wells (AW-2, DW-1, and DW-2 on Figure 4.12-5, 1,400 feet to 2,000 feet from the test well), <br /> regional groundwater levels varied by at least two to three feet during the 10 days that water levels were <br /> monitored prior, during, and after the aquifer pumping test. Those regional fluctuations, caused by <br /> groundwater pumping from other properties, was several orders of magnitude greater than the effect <br /> from pumping the test well at 430 gpm for 24 hours. <br /> 4.12.1.4 Water Quality <br /> There are no permanent surface water bodies on the Project site. Since the property is used for <br /> agriculture, there are no stormwater controls or Best Management Practices (BMPs) currently installed at <br /> the Project and no surface water monitoring is conducted for water quality conditions. The existing <br /> vineyard is irrigated with groundwater, so the quality of the irrigation water will be consistent with the <br /> quality of the groundwater underlying the Project site. <br /> Terracon (2021 A) collected a groundwater sample from the new onsite test well during the aquifer <br /> pumping test described above. The groundwater sample was sent to a California-certified laboratory and <br /> analyzed for parameters consistent with the Federal Safe Drinking Water Act and California Code of <br /> Regulations Title 22, Chapter 15, including coliform bacteria, general minerals and ions, metals, volatile <br /> and semi-volatile organic contaminants, radionuclides, and a range of herbicides and pesticides.The <br /> analytical results are presented in Table 4.12-2. <br /> Table 4.12-2.Summary of Groundwater Analytical Results <br /> Sample ID Units TW-1-W <br /> Sample Date 4/28/2021 <br /> Bacteria Indicators by EPA Standard Method(SM)9221 <br /> Fecal Coliform MPN/100ml ND<1.8 <br /> Total Coliform MPN/100ml ND<1.8 <br /> E.Coli MPN/100ml ND<1.8 <br /> Specific Conductivity at 25 C by Method SM2510B <br /> Specific Conductivity pmhos/cm 228 <br /> General Minerals and Ions by EPA Method 300.1 <br /> Bromate pg/L ND<0.20 <br /> Chlorate pg/L 28 <br /> Hydrology and Water Quality 4.12-11 October 2021 <br />