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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 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 (µS/cm) as CaCO3 as CaCO3 as OH as CO3 as HCO3 as NO3 as NO2 (µg/L) (µa) (µg/L) (µWL) (MPN/100 mL) 6.5 to Maximum Contaminant Level' 900* 500* 85* - 250* 250* 45 3 - 2 1,000* 300* 50* 5,000* Koster 7/6/1995 820 510 7.6 230 61 19 78 ND 160 ND ND 195 110 95 33 ND ND ND 1 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 820 500 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 840 460 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 <20 <1.1 <LI 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 11