Intergalactic medium (IGM) metal absorption lines observed in z>5 quasar spectra offer the opportunity to probe early galaxy feedback process and the nature of enriching sources in the reionization and post-reionzation era. The question of whether galaxies drove cosmological reionization depends crucially on the strength of the feedback processes that regulated their growth. Theoretical models predict that outflows dominate galaxy growth and through it the ionizing luminosity function; at the same time, these superwind outflows would enrich their surrounding IGM, resulting in a strong IGM-galaxy correlation. We propose to test this idea directly by identifying and studying the host galaxies of four known IGM CIV absorbers along two quasar lines of sight at z=5-6. We will center the ACS ramp filters on the Ly alpha wavelengths corresponding to the CIV absorbers' as-yet-undiscovered host galaxies. With deep imaging, we will then detect Ly alpha emission from galaxies with star formation rates as low as ~1 M_sun/yr that lie within impact parameters of ~150 kpc (physical) from the quasars. We will use existing deep broad-band imaging to eliminate contaminants and constrain the properties of the absorbers' host galaxies. By combining our results with the single existing CIV galaxy detection at z>5, we will construct the first sample allowing direct statistical constraints on the nature of feedback near the end of the reionization epoch and providing tests to models of IGM enrichment and ionization. We will observe SDSS J1030+0524 and J1306+0356 for 15 orbits with ACS using the narrow-band (2% bandpass) ramp filter. We will devide the program into four visits. In the first visit, we will observe: (1). One orbit FR853 for J1030+0524, with the exposure time is ~2540sec. (2). Two orbits of FR716N, with exposure time ~2695sec for each orbit. We use 2-point ACS-dither-line pattern to populate the two orbits. In the second visit, we will first do a POS TARG offset regarding to the first visit, and then we observe: (1). One orbit in FR716 for J1030+0524, (2). Four orbits in FR853 for J1030+0524. We will carry out a ACS-WFC-DITHER-BOX dither with orbit long (~2695sec) exposures to populate the four orbits in FR853. In the third visit, we will do four orbits in FR782 for J1030+0524. We will carry out a ACS-WFC-DITHER-BOX dither with orbit long (~2540sec) individual exposures. In the fouth visit, we will observe three orbits FR716 for J1306+0356, and we will do one ~2540sec exposure to populate the first orbit, and the ACS-WFC-DITHER-LINE with ~2695sec exposures to populate the rest two orbits of FR716 observations. All the orbit-long exposures are split into two subexposures because of cosmic ray rejection (CR-SPLIT=2). 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