Unit: mg/L (pH value is dimensionless) Sampling location (sampling time) Sample number Character description Test items Test results Groundwater (8:51) 191214A202 Colorless and transparent pH value 7.06 Permanganate index 1.7 Nitrate nitrogen 0.235 Chloride 0.20 Ammonia nitrogen 0.059 Copper 0.05 E. coli 20...