1. INTRODUCTION
2. OBSERVATIONS AND DATA PROCESSING
3. $N_{\mathrm{HI}}$ ANALYSIS
4. METALLICITY ANALYSIS
4.1. Methodology
4.2. Metallicity of the CGM for $L^{*}$ Galaxies
4.3. Super-solar CGM Gas
4.4. Intrinsic Correlations
4.5. Extrinsic Trends
4.6. Enhanced α/Fe
5. DISCUSSION
5.1. Escape Fraction $(f_{\mathrm{esc}}^{\mathrm{CGM}})$
5.2. Enrichment of the cool CGM
5.3. Revisiting the Cool CGM Mass $(M_{\mathrm{CGM}}^{\mathrm{cool}})$
5.4. Revisiting the Galactic Missing Baryons Problem
6. CONCLUDING REMARKS