Which of the following should be chosen as sampling points for river water quality monitoring? At the area with the highest turbulence Right after a big boulder In the middle and near the banks of the river O Upstream and downstream of an area where wastewater is discharged to the river When conducting sampling of water for total suspended solids, what must be observed? It is recommended to collect sample by turning mouth of the bottle towards the direction of the water flow O It is not necessary to clean the sample bottle prior collection of samples It is recommended to collect sample by turning mouth of the bottle towards opposite the water flow It is recommended to screw on the cap/cover of the sample bottle while it is underneath the water surface

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