See if Figure 5 may possibly help

file:///C:/Users/Subhash/Downloads/Impact%20of%20recharge%20from%20a%20check%20dam%20on%20groundwater%20quality.pdf

thats the question how to plot my values in that plot to classify the groundwater samples in three classes.

 Regarding your above question , you can refer to the following scientific paper  :

Impact of recharge from a check dam on groundwater

quality and assessment of suitability for drinking

and irrigation purposes

S. Parimala renganayaki& L. Elango

Received: 27 February 2013 / Accepted: 28 May 2013

Saudi Society for Geosciences 2013

 I hope that you can find the answer , or any indication leads to your subject.

Good by

 Regarding your above question , you can refer to the following scientific paper  :

Impact of recharge from a check dam on groundwater

quality and assessment of suitability for drinking

and irrigation purposes

S. Parimala renganayaki& L. Elango

Received: 27 February 2013 / Accepted: 28 May 2013

Saudi Society for Geosciences 2013

 I hope that you can find the answer , or any indication leads to your subject.

Good by

 Regarding your above question , you can refer to the following scientific paper  :

Impact of recharge from a check dam on groundwater

quality and assessment of suitability for drinking

and irrigation purposes

S. Parimala renganayaki& L. Elango

Received: 27 February 2013 / Accepted: 28 May 2013

Saudi Society for Geosciences 2013

 I hope that you can find the answer , or any indication leads to your subject.

Good by

Ashwani, i am little bit confused let me know which variables should i plot on X  and Y axis. 

plot with total ions (anions and cations) concentration in meq/l on y axis and PI on x axis.

Thanks Amit....