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2020 ANNUAL GROUNDWATER MONITORING REPORT <br /> TEICHERT AGGREGATES AND GRANITE CONSTRUCTION <br /> VERNALIS AREA <br /> Metal concentrations(i.e., copper, iron, and zinc) in shallow groundwater samples(i.e., from the Hall <br /> and Faulkner wells)are typically low and frequently below their respective reporting limits. Iron and zinc <br /> detections are more frequent at the Faulkner well than at the Hall well. <br /> In the deep wells Tracy#1 and#3, metal concentrations are typically low and frequently below their <br /> respective reporting limits. Metal concentrations(i.e., particularly iron and manganese) are more <br /> frequently detected and more variable in the other deep wells(i.e., Brown's New, Brown's#1, Granite <br /> #3, and Granite#5). <br /> Total coliform bacteria have been nondetect from the Hall and Faulkner domestic wells with few <br /> exceptions. Most recently, total coliform bacteria were detected at the reporting limit of 1.1 MPN/100 <br /> mL in the August 2008 sample retrieved from the Hall well. Fecal coliform organisms were nondetect. <br /> The sporadic presence of coliform bacteria can be due to sample contamination at the time of <br /> collection, the introduction of coliform bacteria to the well structure during well and pump maintenance <br /> work, or the detachment of bacterial biofilm from the well structure in combination with naturally <br /> occurring coliform organisms. <br /> LUHDORFF&SCALMANINI <br /> CONSULTING ENGINEERS 8 <br />