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We survey the incidence and absorption strength of the metal-line transitionsCII 1334 and CIV from the circumgalactic medium (CGM) surrounding z~2 quasars,which act as signposts for massive dark matter halos M_halo~10^12.5 Msun. Onscales of the virial radius (Mvir~160kpc), we measure a high covering fractionfC=0.73+/-0.10 to strong CII absorption (rest equivalent width W1334>0.2A),implying a massive reservoir of cool (T~10^4K) metal enriched gas. Weconservatively estimate a metal mass exceeding 10^8 Msun. We propose thesemetals trace enrichment of the incipient intragroup/intracluster medium thatthese halos eventually inhabit. This cool CGM around quasars is the pinnacleamongst galaxies observed at all epochs, as regards covering fraction andaverage equivalent width of HI Lya and low-ion metal absorption. We argue thatthe properties of this cool CGM primarily reflect the halo mass, and that otherfactors such as feedback, star-formation rate, and accretion from theintergalactic medium are secondary. We further estimate, that the CGM ofmassive, z~2 galaxies accounts for the majority of strong MgII absorption alongrandom quasar sightlines. Lastly, we detect an excess of strong CIV absorption(W1548>0.3A) over random incidence to 1Mpc physical impact parameter andmeasure the quasar-CIV cross-correlation function: xi(r)=(r/r0)^-g with r0 =7.5Mpc and g=1.7. Consistent with previous work on larger scales, we infer thatthis highly ionized CIV gas traces massive (10^12 Msun) halos.

Quasars Probing Quasars VII. The Pinnacle of the Cool Circumgalactic Medium Surrounds Massive z~2 Galaxies