68--Preservative (acid solution) used in water sampling programs

This modification adds the list of preservatives (acid solution) used in water sampling programs by the Water Resources Discipline (WRD) Distric and Field Office to preserve environmental water samples for analysis.1.) 7.5-7.7 ultrex grade nitric acid solution (J.T. Baker), in 3.5mL, polypropylene (PP) screw cap vials, number Q436FLD. 2.) 1mL 4.5N sulfuric acid solution (Fisher Chemical), in 3.5mL PP screw cap vials, USGS/NFSS number Q438FLD. 3.) 4mL, 18N (1:1) sulfuric acid solution (Fisher Chemical), in 8mL PP screw cap vials, USGS/NFSS number Q403FLD. 4.) 2ml, 18N (1:1) sulfuric acid solution (Fisher Chemical), in 3.5mL PP screw cap vials, USGS/NFSS number Q366FLD 5.) 2ml, 6N (1:1) Omni Trace Hydrochloric acid solution (Fisher Chemical), in 3.5mL PP screw cap vials, USGS/NFSS number Q446FLD. See Numbered Note 22.