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1890s - 1990s Timeline of Important Dates and Events
| 1890s | |
| Filling begins | |
| 1910s | |
| Filling in southwest part of site | |
| 1934 | |
| Olin buys assets of Winchester Repeating Arms | |
| Filling on Hamden Middle School property | |
| 1939 | |
| Rochford Field developed from former dump site. | |
| 1941 | |
| Rochford Field Annex (Mill Rock Park) developed from former dump site. | |
| 1950 | |
| New Haven Water company sells property for future Middle School to town. Town then transfers property to State Board of Education for development of regional technical high school. | |
| 1954 | |
| State of Connecticut transfers land back to town because of need for "expensive foundations". | |
| Town begins construction of Michael J. Whalen Jr. High School | |
| 1979 | |
| Hamden Middle School (HMS) athletic field soil tests show lead, other metals | |
| 1989 | |
| Tornado exposes contaminated materials (lead in soil) | |
| 1992 | |
| Environmental Protection Agency determines no removal action required at soccer fields | |
| 1993 | |
| Plans to expand Hamden Middle School fail when soil contamination found (PAHs) | |
| 1994 - 1996 | |
| Town places soil cap over athletic fields behind HMS at DEP's recommendation |