USGS Precipitation Quantity and Chemical Quality Monitoring Program-Precipitation Chemistry Data

Direct Link to Data	Download Data in an Excel Worksheet
Catoctin Mountain	Catoctin Mountain
Massanutten Mountain	Massanutten Mountain
Old Rag Mountain	Old Rag Mountain

Data are provided for the following parameters:

• Date - Date the sample was collected from the field and includes all precipitation that fell after the previous sample collection date.
• Julian Day
• Cond - Specific conductance (µS/cm)
• Amt - Precipitation amount (in)
• FpH - Field pH
• H+ - Hydrogen ion concentration based on field pH (µeq/l)
• Ca - Calcium concentration (µeq/l)
• Mg - Magnesium concentration (µeq/l)
• Na - Sodium concentration (µeq/l)
• K - Potassium concentration (µeq/l)
• NH4 - Ammonium concentration (µeq/l)
• Cl - Chloride concentration (µeq/l)
• NO3 - Nitrate concentration (µeq/l)
• SO4 - Sulfate concentration (µeq/l)
• NO2 - Nitrite concentration (µeq/l)
• HPO4 - Inorganic biphosphate (µeq/l)
• NPOC - Non-purgeable organic carbon (ppm C)

If the concentration of a constituent was below the analytical detection limit, "nd" is shown for that constituent. If the constituent was not analyzed, "na" is shown for that constituent.

Go to the Program Information for these sites.