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Table 3 Groundwater Quality - Calendar Year 2022 Teichert Aggregates and Granite Construction -Vernalis Area, San Joaquin County (all units in mg/L, unless otherwise specified) Total 'Dotal ('aliform Sampling EC TDS pH Hardness Ca Mg Na K Alkalinio Oil CO3 HCO3 SO4 CI NO3 NO2 P F B Cu Pe Nin /,n total Fecal Point Date (PS/cm) as CaCO3 as CA 03 as 011 as CO3 as 11003 as NO3 as NO2 (pg/L) (µg/I,) (pg/[-) (pg/L) (11PN/100 in L) Maximum Contaminant 6.5 to Level' 900* 500* 8.5* - - - - 250* 250* 45 3 2 1,000* 300* 50* 5,000* Hall 5/25/2022 824 470 7.7 205 54 17 72 1 180 <10 <10 220 79.5 80 9.5 <0.3 - 0.2 0.4 <10 <30 <10 <20 <1.1 <1.1 Hall 11/15/2022 760 470 7.5 215 58 17 73 2 180 <10 <10 220 77.9 81 9.4 <0.7 - 0.2 0.4 <10 Gi0 <10 QO <1.1 <1.1 Faulkner 5/25/2022 724 440 7.7 189 51 15 62 1 170 <10 <10 210 71.2 69 5.6 <0.3 - 0.2 0.4 <10 100 <10 <20 <1.1 <1.1 Faulkner 11/15/2022 696 430 7.5 206 56 16 66 1 180 <10 <10 220 75.6 73 5.9 <0.7 - 0.2 0.4 <10 80 <10 <20 <1.1 <1.1 S.Tracy#3 5/25/2022 877 540 7.6 262 67 23 72 2 180 <10 <10 220 165 51 19.3 <0.3 - 0.2 1.0 <10 70 <10 <20 - - S.Tracy#3 11/15/2022 848 520 7.4 276 71 24 73 2 190 <10 <10 230 172 53 17.4 <0.7 - 0.2 1.0 <10 30 <10 <20 - - Brown's New 5/25/2022 no power to well pump,no sample could be obtained Brown's New 11/15/2022 831 530 7.3 263 69 22 73 1 190 <10 <10 230 179 39 10.5 <0.7 - 0.3 1.1 <10 30 <10 30 - - Granite#5 5/25/2022 982 630 7.7 267 69 23 78 2 200 <10 <10 240 207 48 11 5 <0.3 - 0.2 1.1 <10 80 <10 <20 - - Granite#5 11/15/2022 pump was removed from well,no sample could he obtained Granite#4= 11/15/2022 914 620 7.2 297 78 25 78 2 200 <10 <10 240 210 49 11.6 -0 7 -- 0.2 1.0 <10 <30 <10 <20 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. 2.Granite#4 sampled in place of Granite#5 during 2022Q4. Page 1 of 1