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Table 3 Groundwater Quality- Calendar Year 2021 Teichert Aggregates and Granite Construction -Vernalis Area, San Joaquin County (all units in mg/L, unless otherwise specified) Total Total Coliform Sampling EC TDS pH Hardness Ca Mg Na K Alkalinity OH CO3 HCO3 SO4 Cl NO3 NO2 P F B Cu Fe Mn Zn Total Fecal Point Date (liS/cm) as CaCO3 as CaCO3 as OH as CO3 as HCO3 as NO3 as NO2 (pp,/L) (I!g/L) (µp/L) (µp,/L) (MPN/100 mL) Maximum Contaminant 6.5 to Level' 900* 500* 8.5* 250* 250* 45 3 2 1,000* 300* 50* 5,000* Hall 5/19/2021 786 470 8.2 207 55 17 71 2 180 <10 <10 220 82.8 84 9.1 <0.7 - 0.2 0.4 <10 <30 <10 <20 <1.1 <1.1 Hall 11/22/2021 771 460 7.8 198 53 16 69 2 180 <10 <10 210 81.0 78 9.0 <0.7 - 0.2 0.4 <10 <30 <10 <20 <1.1 <1.1 Faulkner 5/19/2021 701 410 8.1 206 56 16 66 1 180 <10 <10 220 73.1 62 5.9 <0.7 - 0.2 0.4 l0 130 <10 40 <1.1 <1.1 Faulkner 11/22/2021 732 420 7.8 189 51 15 62 1 170 <10 <10 210 67.8 66 5.5 <0.7 - 0.2 0.4 <10 90 <10 40 <1.1 <1.1 S.Tracy#3 5/19/2021 842 550 8.2 271 69 24 73 2 180 <10 <10 210 150 56 23.1 <0.7 - 0.2 1.0 30 600 70 <20 - - S.Tracy#3 11/22/2021 844 530 7.8 245 62 22 67 2 170 <10 <10 210 148 56 23.9 <0.7 - 0.2 0.9 <10 40 <10 <20 - - Brown's New 5/19/2021 854 540 8.0 260 68. 22 75 2 190 <10 <10 230 183 39 8.7 <0.7 - 0.2 1.1 <10 120 <10 <20 -- - Brown's New 11/22/2021 878 616 7.7 246 64 21 72 2 190 <10 <10 230 179 38 9.6 <0.7 - 0.2 1.0 <10 40 <10 <20 - - Granite#5 5/19/2021 931 630 7.8 299 77 26 85 2 200 <10 <10 240 204 49 11.6 <0.7 - 0.2 1.1 <10 <30 <10 <20 - - Granite#5 11/22/2021 this well was off,no sample could be obtained Notes: 1. Maximum contaminant levels for drinking water supply. Concentrations marked"*"are secondary,i.e.,consumer acceptance limits for drinking water. For EC,TDS,chloride,and sulfate,the recommended(lower)values are given. Page 1 of 1