1. Introduction
2. Target Sample
2.1. Selection Criteria
2.2. Target Prioritization
2.3. Final Sample Demographics
2.4. Non-Debris Disk Targets
3. Observations
3.1. Observed Sample
3.2. Observing Modes
4. Data Reduction
4.2. Polarimetric Noise Sources
4.3. Total Intensity from Spectral and Polarimetric Modes
4.4. Spectral Noise Sources
4.5. Image Contrasts
4.6. Disk Morphology Modeling
5. Survey Results
5.1. Debris Disk Detection Overview
5.2. Two New Scattered-light Debris Disks
5.3. Morphological Modeling of Three More Recent GPIES Discoveries
5.4. Individual Results for Other GPIES Debris Disks
5.5. Protoplanetary and Transitional Disk Detections
5.6. Non-detections
5.7. Sample-wide Results on Debris Disk Properties
6. Discussion
6.1. Scattered-light Disk Detection and Comparison to Thermal Wavelengths
6.2. Predictive Power of Detectability Metrics
6.3. Gas in Scattered-light Debris Disks
6.4. Evidence of Differing Grain Populations in HD 117214 and HD 145560
6.5. Substellar Companions in GPIES Disk Systems
7. Conclusions