Evidence
11 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-11).
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[1]research packet 943-packet.md (2 sources cited) [museum_official]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-pc-820-pc820-pkt-943-packet-md
-
[2]NavSource Online, Submarine Chaser Photo Archive, PC-820 page (live URL verified 2026-10-03; page states no DANFS history is available) [other_primary]
- Locator
- PC-820 page, milestone bullets, disposition lines, and GC-30 photograph caption
- Finding type
- vessel_history
- Finding
- The PC-820 page identifies this hull as a PC-461-class submarine chaser: laid down 10 May 1943 by the Albina Engine and Machinery Works, Portland, OR; launched 2 August 1943; commissioned USS PC-820 on 30 September 1943; transferred to the War Shipping Administration in July 1948; transferred to Mexico in 1952 and reclassified GC-30; 'Fate unknown.' Page also carries a c. 1953 Mexican Navy photograph of the hull as GC-30 (photo credit Robert Hurst).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-1952
- Population
- PC-820 construction crew and Navy operating crew (1943-48); Mexican Navy crew (1952-forward)
- Limitations
- NavSource is a volunteer archival compilation rather than a Navy publication; its page supplies the cited hull history and a Mexican Navy photograph but provides no asbestos, materials, crew-exposure, or legal-eligibility information. The page explicitly states there is no DANFS history available for PC-820.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-01
-
[3]NavSource PC-820 specification block (displacement, dimensions, armament, propulsion with engine serial numbers) [other_primary]
- Locator
- PC-820 page, 'Specifications' block
- Finding type
- vessel_history
- Finding
- The page gives this hull's specifications as 450 tons displacement, 173 feet 8 inches length, 23-foot beam, 10-foot 10-inch draft, 20.2-knot speed, complement 65; armament one 3"/50 dual-purpose mount, one 40mm mount, five 20mm guns, two rocket launchers, and two depth charge tracks. Propulsion is listed as two 1,440-bhp Hooven-Owen-Rentschler R-99DA diesel engines (serial numbers 7017 and 7018), Westinghouse single-reduction gear, and two shafts - a diesel plant with no steam machinery.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-1952
- Population
- PC-820 construction and operating crew
- Limitations
- The specification block is not a surviving-hull survey and does not identify insulation or other asbestos-containing products. It supports propulsion and vessel identity only; no ship-specific asbestos inference is made from the diesel machinery.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-02
-
[4]shipbuildinghistory.com, Albina Machine & Engine Works (Portland OR) hull-production table; corroborated by the site-mirrored PC/SC/PCE/PCS small-ships table at navalmarinearchive.com/sbh/smallships/pc2.html [other_primary]
- Locator
- Albina yard table, hull #104 row; pc2.html PC-820 row
- Finding type
- historical_record
- Finding
- The builder's-yard production table lists this hull as Albina yard hull number 104: 'PC 820 | U.S. Navy | Sub Chaser | 284 | 174 | 30-Sep-43 | To Mexico 1952 as GC-30' (Hull # / Original Name / Original Owner / Type / GT / Ft. / Delivery / Disposition columns). The mirrored PC table gives the identical entry (Albina E. & M., Portland OR; 30-Sep-43; 'To Mexico 1952 as GC-30') and documents sister hulls to the same Mexican GC-3x series (e.g., PC-819 'To Mexico 1952 as GC-37'; PC-608 and PC-614 to GC-31 and GC-32) - class-level corroboration that Mexico acquired a block of ex-US PC-461s reclassed as guardacostas GC-30 through GC-38 (nine boats per class secondary sourcing). Confirms the yard serial, delivery/commissioning date, and Mexican disposition independently of NavSource.
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-1952
- Population
- Albina Engine and Machinery Works construction trades (1943)
- Limitations
- shipbuildinghistory.com is a respected secondary compilation of yard production records, not a government registry; the 'Delivery' column coincides with the commissioning date and gross-tonnage/length figures (284 GT / 174 ft) differ in kind from NavSource's displacement figure (450 t). No asbestos, materials, or crew information.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-03
-
[5]uboat.net Allied Warships of WWII, USS PC-820 (PC-820) patrol craft of the PC-461 class - builder, order date, milestones, wartime commanding-officer roster [other_primary]
- Locator
- uboat.net PC-820 ship page, ship-data table and 'Commands listed' roster
- Finding type
- vessel_history
- Finding
- uboat.net's warship entry for this hull lists: built by Albina Engine & Machine Works (Portland, Oregon); ordered 10 August 1942; laid down 19 May 1943 (variant - NavSource carries 10 May 1943, see gaps); launched 2 August 1943; commissioned 30 September 1943. Its wartime commanding-officer roster lists: A. D. Maddalena, Jr., USNR (30 Sep 1943 - late 1944); W. E. Goding, USNR (late 1944 - early 1945); R. J. Campbell, USNR (early 1945 - mid/late 1945); G. S. Fletcher, USNR (mid/late 1945 - early 1946).
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1942-1946
- Population
- PC-820 wartime crew (complement ~65) and commanding officers
- Limitations
- uboat.net is a specialist secondary compilation; its laid-down date (19 May 1943) conflicts with NavSource (10 May 1943) and the conflict is carried in gaps rather than silently reconciled. The roster covers WWII only and lists no postwar officers. No asbestos, materials, or exposure information.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-04
-
[6]Published obituary of Antonio 'Tony' Fazzolari (1925-2016), Portland, OR - machinist's mate aboard USS PC-820 May 1944-June 1946 (republished at ourwarheroes.org tribute site) [reputable_press]
- Locator
- ourwarheroes.org Fazzolari tribute page reproducing the Portland obituary (military service block)
- Finding type
- historical_record
- Finding
- A published obituary documents a named crew member aboard this hull: Tony Fazzolari served aboard USS PC-820 as a machinist's mate from May 1944 until June 1946; the obituary describes him 'fishing off the deck in Adak, Alaska' and notes that he had worked in the Portland shipyards building Navy PC boats while in high school. This is a secondary-source indication that PC-820 operated in Aleutian/Alaska-area waters during 1944-46 - the only service-theater detail located for this hull.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1944-1946
- Population
- Tony Fazzolari (MM, USN, May 1944-Jun 1946); PC-820 wartime crew
- Limitations
- Obituary/family-tribute source, not an official service record: it establishes one crew member's stated service aboard the hull and an Adak area association, not the ship's full operating area, dates of station, or mission record. No deck log or muster roll was located to corroborate; carried as an archival lead. No asbestos or materials content.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-05
-
[7]Navy and Marine Corps Awards Manual, NAVPERS 15,790 (Rev. 1953), Part IV 'Campaign and Service Medals', Section 2-16 ship tables (American, European-African-Middle Eastern, and Asiatic-Pacific Areas) - verbatim transcription via HyperWar/ibiblio (live fetch verified 2026-10-03) [other_primary]
- Locator
- Awards-IV-16.html, Section 2-16 ship tables (all three theater areas; 'PC'-prefixed rows checked)
- Finding type
- historical_record
- Finding
- PC-820 does not appear anywhere in the 1953 awards manual's ship-eligibility tables for World War II campaign and service medals (American Area, European-African-Middle Eastern Area, Asiatic-Pacific Area sections searched). Sister hulls do appear - 'PC 800', 'PC 802', and 'PC 803' are listed with Asiatic-Pacific campaign rows. PC-820's absence means no campaign-medal ship-eligibility listing was published for this hull in the 1953 manual.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1953 (manual coverage)
- Limitations
- Absence from the eligibility tables is not proof of where the ship operated - it shows the Navy published no campaign-medal eligibility rows for this hull as of 1953. Some operating areas (e.g., stateside, training, or non-qualifying patrol stations) did not generate ship-table entries. This row documents a records check, not the vessel's actual movements.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-06
-
[8]DANFS, Bluffton I (PC-461) - class-lead specifications and representative class service record (Wayback capture 2025-02-22; live NHHC page returned 404 to automated fetch 2026-10-03) [nhhc_danfs]
- Locator
- DANFS Bluffton I (PC-461) entry, spec block and service narrative (Wayback capture)
- Finding type
- vessel_history
- Finding
- The DANFS entry for the class lead documents the PC-461 pattern and spec block: 'PC-461: dp. 280; l. 173'8"; b. 23'0"; dr. 10'10"; s. 20.2 k.; cpl. 65; a. 2 3", 2 20mm., 2 .50-cal. mg., 2 .30-cal. mg., 2 dcp., 2 dct.; cl. PC-461' - the same 173'8" / 23' / 20.2-knot / complement-65 characteristics NavSource lists for PC-820. PC-461's own record (Caribbean Sea Frontier, Panama Sea Frontier convoy escort, then Pacific Fleet service from October 1944) illustrates the escort/patrol employment typical of the class; Albina Engine and Machinery Works of Portland built 21 class units including this hull (PC-820 = yard hull 104).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1946
- Population
- PC-461-class construction and operating personnel (1941-45)
- Limitations
- Class-lead context only - PC-461's service narrative is not PC-820's; no service facts are attributed to this hull from this row. The live NHHC page returned 404 to automated fetches this session (standing NHHC link-rot defect noted since BATCH-01); the February 2025 Wayback capture is cited and labeled as archived.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-07
-
[9]Era inference built on: NavSource specifications for this hull (two 1,440-bhp Hooven-Owen-Rentschler R-99DA diesels, Westinghouse reduction gear, two shafts - a diesel plant, no steam); DANFS PC-461 class-lead spec block; GAO HRD-80-2 Navy asbestos-era program documentation (see ev-09) [other_primary]
- Locator
- NavSource PC-820 specification block; DANFS Bluffton I spec block; GAO HRD-80-2 product page
- Finding type
- asbestos_application
- Finding
- A steel-hulled PC-461-class submarine chaser built in 1943 with twin diesel propulsion falls within the period in which Navy vessels commonly used asbestos insulation and related products. For a diesel small craft, plausible era-standard applications include machinery or exhaust insulation, gaskets, valve packing, and electrical insulation; no boiler or steam-pipe lagging pathway is established for this hull.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1943-1952
- Population
- Albina construction trades (1943); Navy operating crew (1943-48); Mexican Navy crew (1952-forward)
- Limitations
- This is an inference from class, construction era, hull type, and propulsion, not documentation that asbestos was installed aboard PC-820. It does not establish product identity, quantity, location, remaining material, exposure, causation, or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-08
-
[10]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2
- Finding type
- gov_survey
- Finding
- GAO documented that the Navy used asbestos insulation extensively aboard ships and did not begin substituting alternative insulation materials until the early 1970s - spanning this hull's entire construction (1943) and U.S. Navy service era (1943-48).
- Verification
- verified
- Role
- context
- Documentation level
- context_only
- Accessed
- 2026-10-03
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation; supports era context only, not any fact specific to this hull. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403, confirmed 2026-10-03 - consistent with the standing BATCH-01/-98 defect); content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-09
-
[11]Batch-8191 search ledger (this record): NavSource PC-820; shipbuildinghistory Albina yard table + sbh PC mirror table; uboat.net PC-820; DANFS Bluffton I via Wayback; NAVPERS 15,790 awards manual; MARAD Vessel History Database; SEMAR DIREHICUN guardacostas article; GAO product page; CourtListener (pacing-blocked); NARA catalog; secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-pc-820-pc820-01 through -14
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, bill of materials, or verified litigation naming USS PC-820 was found in the public sources searched. Checked registries returned negatives of their own: the MARAD Vessel History Database holds no record for PC-820 or GC-30 (sisters PC-800 and PC-823 have status cards; PC-820 does not); the NVR holds no entry (disposed before its coverage window); no DANFS entry exists. CAVEAT: CourtListener could not be queried this session - the authenticated helper's fleet-wide pacing limiter returned 'budget momentarily spent' on five spaced attempts (four on the exact-name opinion query, one on the hull-number opinion query); logged as blocked in search_ledger, not as a negative result. Secondary web sweeps surfaced no qualifying case; the only 'asbestos' material is law-firm marketing content (ship/asbestos listicle sites asserting asbestos aboard PC-class hulls without primary sourcing) - excluded by source policy.
- Verification
- partial
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 2026-10-03
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard - and the litigation repository search is a genuine open gap (pacing-blocked, not run to completion). Deck logs, Albina work packages, WSA transfer documents, and Mexican naval records are undigitized leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pc-820-pc820-10