Official Records of the Rebellion: Vol 11, Chap 23, Part 1: Peninsula Campaign: Reports of Brig. Gen. John G. Barnard, U. S. Army, Chief Engineer of operations from May 23, 1861, to August 15, 1862.

No.2.

Reports of Brig. Gen. John G. Barnard, U. S. Army, Chief Engineer
of operations from May 23, 1861, to August 15, 1862.

WASHINGTON, January 26, 1863.

106-107	Fortifications of Washington
107-108	Compares them to Lines of Torres Vedras
108-109	Organisation of the Engineers on the Peninsula
109-110	Siege of Yorktown
110	The advance from Yorktown
110-112	The Nature of the Chickahominy
112	Battle of Seven Pines or Fair Oaks, day one (31st May)
112-114	Battle of Seven Pines or Fair Oaks, day two (1st June)
114-115	After Seven Pines or Fair Oaks
115-116	The Bridges on 19 June, and subsequent defensive works
116-117	25th June (Battle of Oak Grove)
117-118	26th June (Battle of Mechanicsvill)
118	27th June (Battle of Gaines’s Mill)
118-119	28th June
119	29th June (Battle of Savage's Station)
120	30th June (Battle of Glendale/ Frayser’s Farm/ White Oak Swamp)
120-121	1st July (Battle of Malvern Hill)
121	Retreat to Harrison's Landing
121-122	Move into better positions
122-124	Examination of the banks of the Chickahominy and James Rivers
124-126	Officers mentioned in dispatches
126-127	Complains about rank
127-128	Compares types of Pontoon Bridge
128-130	Discusses mistakes made during the campaign
130-132	Mistakes before Richmond
132-134	List of Engineer officers and duties, May 1862

Original report is a single document, divided here roughly by topic

Official Records of the Rebellion: Volume Eleven, Chapter 23, Part 1: Peninsular Campaign: Reports, pp.106-134

web page Rickard, J (20 June 2006), https://www.historyofwar.org/sources/acw/officialrecords/vol011chap023part1/00002_00index.html

Official Records of the Rebellion