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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 (pS/cm) as CaCO3 as CaCO3 as OH as CO3 as HCO3 as NO3 as NO2 (pg/L) (pg/L) (pg/L) (pg/L) (MEN/100 ml.) 65to Maximum Contaminant Level' 900' 500' 8.5• - - - - - - - - - 250• 250' 45 3 2 - 1,000' 300' 50' 5,000• Granite#5 11/24/2020 874 560 8.1 258 67 22 73 2 190 <10 <10 230 158 43 13.7 <0.7 — 0.2 1.0 1,010 10,600 s0 60 — — 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 50 ND — — Koster 10/4/1994 890 500 7.7 230 62 19 87 ND 151 ND ND 184 110 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 10/16/19% 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 l 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 80 111 ND ND 0.2 0.7 ND ND ND ND — Notes: As of 2004,non-detected values are given as"<reporting limit". 1. Maximum contaminant levels for dnaking 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 10 of 10