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2021 ANNUAL GROUNDWATER MONITORING REPORT <br /> TEICHERT AGGREGATES AND GRANITE CONSTRUCTION <br /> VERNALIS AREA <br /> slightly higher in shallow zone groundwater than in deep zone groundwater. Elevated nitrate <br /> concentrations in groundwater,documented since pre-mining times to the present, are most likely <br /> attributable to historical and ongoing agricultural land use in the area. In summary,the existing data <br /> record shows no indication that mining operations have changed groundwater quality to date. <br /> LUHDORFF&SCALMANINI <br /> CONSULTING ENGINEERS 9 <br />