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We present the first results from a study of OVI absorption around galaxiesat $z<1.44$ using data from a near-infrared grism spectroscopic Hubble SpaceTelescope Large Program, the Quasar Sightline and Galaxy Evolution (QSAGE)survey. QSAGE is the first grism galaxy survey to focus on the circumgalacticmedium at $z\sim1$, providing a blind survey of the galaxy population. Usingthe first of 12 fields, we provide details of the reduction methods, inparticular the handling of the deep grism data which uses multiple positionangles to minimise the effects of contamination from overlapping traces. Theresulting galaxy sample is H$\alpha$ flux limited ($f({\rm H\alpha}) >2\times10^{-17}$ erg s$^{-1}$ cm$^{-2}$) at 0.68<z<1.44, corresponding to$\gtrsim0.2-0.8$ M$_\odot$ yr$^{-1}$. We combine the galaxy data withhigh-resolution STIS and COS spectroscopy of the background quasar to study OVIin the circumgalactic medium. At z>0.68, we find 5 OVI absorption systems alongthe line of sight with identified galaxies lying at impact parameters of$b\approx100-350$ kpc (proper), whilst we find a further 13 galaxies with nosignificant associated OVI absorption (i.e. $N({\rm OVI})<10^{13.5-14}$cm$^{-2}$) in the same impact parameter and redshift range. We find a largescatter in the stellar mass and star-formation rates of the closest galaxieswith associated OVI. Whilst one of the OVI absorber systems is found to beassociated with a low mass galaxy group at $z\approx1.08$, we infer that thedetected OVI absorbers typically lie in the proximity of dark matter halos ofmasses $10^{11.5} {\rm M_\odot}\lesssim M_{\rm halo}\lesssim10^{12} {\rmM_\odot}$.

Quasar Sightline and Galaxy Evolution (QSAGE) Survey - I. The Galaxy Environment of OVI Absorbers up to z=1.4 around PKS 0232-04