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We present an analysis of the galaxy environment and physical properties of apartial Lyman limit system at z = 0.83718 with HI and metal line componentsclosely separated in redshift space ($|\Delta v| \approx 400$ km/s) towards thebackground quasar HE1003+0149. The HST/COS far-ultraviolet spectrum providescoverage of lines of oxygen ions from OI to OV. Comparison of observed spectrallines with synthetic profiles generated from Bayesian ionization modelingreveals the presence of two distinct gas phases in the absorbing medium. Thelow-ionization phase of the absorber has sub-solar metallicities (1/10-thsolar) with indications of [C/O] < 0 in each of the components. The OIV and OVtrace a more diffuse higher-ionization medium with predicted HI columndensities that are $\approx 2$ dex lower. The quasar field observed withVLT/MUSE reveals three dwarf galaxies with stellar masses of $M^* \sim 10^{8} -10^{9}$ M$_\odot$, and with star formation rates of $\approx 0.5 - 1$ M$_\odot$yr$^{-1}$, at projected separations of $\rho/R_{\mathrm{vir}} \approx 1.8 -3.0$ from the absorber. Over a wider field with projected proper separation of$\leq 5$ Mpc and radial velocity offset of $|\Delta v| \leq 1000$ km/s from theabsorber, 21 more galaxies are identified in the $VLT$/VIMOS and Magellan deepgalaxy redshift surveys, with 8 of them within $1$ Mpc and $500$ km/s,consistent with the line of sight penetrating a group of galaxies. The absorberpresumably traces multiple phases of cool ($T \sim 10^4$ K) photoionizedintragroup medium. The inferred [C/O] < 0 hints at preferential enrichment fromcore-collapse supernovae, with such gas displaced from one or more of thenearby galaxies, and confined to the group medium.

A partial Lyman limit system tracing intragroup gas at $z \approx 0.8$ towards HE1003+0149