** Parkway Corporate PWN.AX soars 20% to A$0.012, highest since April 11
** Stock marks biggest intraday pct gain since February 10
** Wastewater treatment firm wins contracts to deliver water infrastructure projects
** Says contracts valued at more than A$13 mln ($8.5 mln)
** YTD, PWN down more than 16%
($1 = A$1.5387)
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))