Recovery and identification of bodies proceeded slowly after the crash because of the need to excavate the crash crater to a significant depth. More than 20 of the passengers were United States citizens, all of them listed as being from Southern California. On July 30, 1970, 52 victims, 49 of whom were identified, were buried at Mount Pleasant Cemetery, and in May 1971 an obelisk and stone monument were erected (Plot 24-1) at the site, with all 109 victims' names inscribed. In 1979, Air Canada added an additional memorial at the cemetery. In June 2002, Castlemore resident Paul Cardin, who had been inspired by a November 2001 Toronto Sun article revisiting the Flight 621 crash scene, made some disturbing discoveries at the site, including aircraft wreckage and possible human bone shards. The Peel Regional Police investigated the findings, and it was later determined that the bones were not of recent origin, and had indeed come from the crash. Continuing searches of the crash site by archaeologist Dana Poulton and Friends of Flight 621 (a Brampton-based advocacy group founded by Cardin) produced hundreds of additional human bone fragments. Since the crash, the surrounding area of the crash site itself has experienced significant residential urbanization. In January 2007, the landowners, in conjunction with the property developers, filed an application to designate a section of the crash site as a cemetery and memorial garden. On July 7, 2013, the memorial was officially opened at the site near Degrey Drive and Decorso Drive in present-day Brampton. The small memorial park, approximately a third of a hectare in size (~3,000 m2), contains lilacs and 109 markers of polished white granite arranged in a random configuration within a bed of black granite paving stones. A polished black granite plaque listing all the victims' names is mounted on a large pink granite boulder. Diarmuid Horgan, coordinator of the memorial site, said that he hoped the dedication ceremony would help victims' families find closure.