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Table 4 <br /> Historical Groundwater Quality Record <br /> Teichert Aggregates and Granite Construction—Vernalis Area, San Joaquin County <br /> (all units in mg/L, unless otherwise specified) <br /> Total Total Coliform <br /> Sampling EC TDS pH Hardness ('a Mg No E Alkalinity Oil CO3 11(03 504 ('I NO3 NO2 P F N C. Fe Mn Z. Total Feeal <br /> Point Date (µs/em) as Cut 03 as Ca('O3 as OH as('03 as 11(03 an NO3 a,NO2 (µPIL) (µg/L) (µg/I,I (og/L) (MPN/1 W mi) <br /> Maximum Contaminant 6.5 to <br /> Level' 900• 500* 91. 'w+ 250• 1' 2 1,000' 300' 50' 5.000- <br /> 1. Maximum contaminant levels for drinking rtulri,upplc Concentrations marked`"are secondary,i.e..consumer acceptmwe limits for drinking water. fur IAC. I I)S,chloride,and sulfate.the recommended(lower)values are given. <br /> 2. Retesting in November 1994 confirmed preset:a dIota lcul iL.nn bacteriaand absence offeeal coliform_ <br /> 3. Sample results for alkalinity series(total a)kaluu:� I d I ('i m and I ICO3)were verified by duplicate sample results from independent laboratory. <br /> 6192011-19'5]AM Page,of 9 <br />