Columns ^7-^9 TOTAL PHOSPHORUS 



Enter total P in microgram-atoms per liter (|j,g-at/l) to hundredths. 



Columns 6O-62 MTRITE-WITROGEN 



Enter nitrite-nitrogen (NOg-N) in microgram-atoms per liter (iig-at/l) to 

 hundredths. Conversions from micrograms per liter of NOg and N to micro- 

 gram-atoms per liter of NOg-N are shown in Tables 35 and 37^ respectively. 



Columns 63-6^ NITRATE-NITROGEN 



Enter nitrate-nitrogen (NO3-N) in microgram-atoms per liter ((ig-at/l) 

 to tenths. Conversions from micrograms per liter of NO3 and N to microgram- 

 atoms per liter of NO3-N are shovm in Tables 36 and 37^ respectively. 



Columns 66-68 SILICATE-SILICON 



Enter silicate-silicon in microgram-atoms per liter (|j,g-at/l) to whole 

 units. Conversions from other units are shown in Tables 38-40. 



Columns 69-7I pH 



Enter pH in Columns 69-7I. 



Column 72 SUBSTITUTED CHEMISTRY 



Enter the appropriate code as given in Table kl to indicate which 

 chemistry field contains substituted chemistry. If no substitution was 

 made, leave Column 72 blank. 



Columns 73-79 are omitted from the data form. The entries in 

 these columns of the Detail Card are identical to the entries 

 in the Master Card; the information must be reproduced in 

 each Detail Card from the Master Card. 



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