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Table 4 Historical Groundwater Quality Record Teichert Aggregates and Granite Construction-Vernalis Area, San Joaquin County (all units in mg/L,unless otherwise specified) Total Total Coliform Sampling EC TDS pit Hardness Ca Mg Na K Alkalinity oil CO3 FIC03 SO4 Cl NO3 NO2 P F B Cu Fe Mn Ln Total Fecal Point Date (µS/cm) as CaCO3 as CaCO3 as Oil as CO3 as FIC03 as NO3 as NO2 (pg/L) (pg/L) (µg/L) (pg/L) (MPN/100 mL) 6.5 to Maximum Contaminant Level' 900• 500• 8.5• - 250• 250• 45 3 2 1,000• 300• 50* 5,000* 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 no well pump,no sample could be obtained Granite#5 5/16/2023 861 570 7.8 272 71 23 77 2 190 <10 <10 240 178 47 14.5 <0.3 - 0.2 1.0 <10 120 10 <20 - - Granite#5 5/21/2024 927 630 7.0 278 72 24 79 2 200 <10 <10 240 201 48 11.5 <0.3 - 0.2 1.0 <10 30 <10 <20 -- - Granite#5 11/15/2024 936 590 8.0 290 75 25 82 2 200 <10 <10 240 216 51 10.8 <0.3 - 0.2 1.1 <10 <30 <10 <20 - - Granite#5 5/14/2025 923 620 8.5 294 75 26 83 2 200 <10 <10 250 214 51 11.0 <0.7 - 0.2 1.1 <10 <30 <10 <20 - Granite#5 12/1/2025 927 600 7.5 285 73 25 83 2 200 <10 <10 240 192 42 11.3 <0.7 - 0.2 1.1 <10 <30 <10 <20 - Koster 6/1/1994 800 490 7.7 240 61 23 94 ND 150 ND ND 180 96 70 31 ND ND 0.2 1.1 ND 470 5o ND - Koster 10/4/1994 890 500 7.7 230 62 19 87 ND 151 ND ND 194 110 70 35 ND ND 0.2 1 ND ND ND ND - Koster 7/6/1995 820 510 7.6 230 61 19 78 ND 160 ND ND 195 110 95 33 ND ND ND I ND 180 ND ND - Koster 10/16/1996 840 500 7.4 240 62 20 87 2 160 - - 200 100 98 32 - - 0.2 ND ND 100 ND ND - Koster 4/9/1997 820 SW 6.8 240 64 18 85 2 170 ND ND 200 96 100 6.5 ND ND 0.5 1 ND 220 ND ND - Koster 7/3/1997 810 550 7.4 230 62 19 82 3 150 ND ND 180 98 95 28 ND ND 0.3 1 ND ND ND ND - - Rustan 3/1/1994 940 460 7.7 178 48 14 87 ND 174 ND ND 212 45 80 11.2 ND ND 0.2 0.7 ND ND ND ND - Rustan 5/25/2022 900 500 7.9 214 56 18 85 2 190 <10 <10 230 81.9 98 18.6 <0.3 0.2 0.8 <10 430 30 QO <1.1 <1.1 Notes: As of 2004,non-detected values are given as"<reporting limit". 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. Retesting in November 1994 confirmed presence of total coliform bacteria and absence of fecal coliform. 3. Sample results for alkalinity series(total alkalinity,OH,CO3,and HCO3)were verified by duplicate sample results from independent laboratory. Page 11 of I