Dear Abhay
First of all sorry for a late reply... As it's year end, quite busy now a days...
The main problem while working in peak summer days or near hot atmosphere is dehydration... A lot tips are available in net... Just go to goggle and have a search with phrase "Prevention against dehydration"...
However a good write up from net has been uploaded by Mr. SSB... I am appreciating SSB and thanks for your participation... Very good and looking for the same in future... What the trend mostly I observed in our this forum is that all wish to get reply to thier started thread, but not participating other threads started by forum members... So request all to participate into more threads, even with a word of appreciation... This will defenitly help to increase our forum participation...
Now Abhay let me tell you one thing... The three points which you mention itself is so valid and more than enough to ensure safe working in hot areas if you really success in implementing practically... Work rotation is the main thing... And if you can in additional provide a rest room near the work place for these workers that will solve the purpose, i think so... In this rest room you may arrange the water availability...
Hope I answered your query and also requestinmg to you, bring those topics into our forum whose solution is not available easily in net... You are a dynamic member in this forum and hope you will take what i said in the positive and in it's right spirit...