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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 1 D pH Hardness Ca Mg Na K Alkalinity Oil ('03 HCO3 SO4 Cl NO3 NO2 P F B Cu Fe Mn Zn 'Dotal Fecal point Date (pS/cm) as CaCO3 as CaCO3 as Off as('03 as IIC03 as 503 as NO2 017;/1.) (pt:/1,) (pg/1.) (pg/1.) (N1PN/100 ml.) 6.5 to Maximum Contaminant Level 900" 500* 8 5" 250* 250* 45 3 - 2 1,000* 300* 50* 5,000* Granite#3 II/W2019 this well was off,no sample could be obtained Granite#4 8/4/2009 965 620 7.9 297 78 25 90 2 200 <10 <10 240 211 48 12.1 <0.3 - 0.2 1.1 20 410 10 <20 - - Granite#5 5/15/2019 960 590 7.4 297 81 23 81 2 190 <10 <10 230 198 46 11.1 <0.2 - 0.2 1.1 <10 60 <10 <20 - - Granite#5 12/3/2019 this well was off,no sample could be obtained Granite#5 5/1/2020 976 630 7.4 290 75 25 84 2 200 <10 <10 240 201 47 11.9 <0.7 - 0.2 1.1 <10 90 <10 <20 - - Granne#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 80 60 - - 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 no well pump,no sample could be obtained Koster 6/1/1994 800 490 7.7 240 61 23 94 ND 150 ND ND 180 % 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 l 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 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 % 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 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 10 of 10