Evidence
12 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-12).
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[1]research packet 1005-packet.md (1 sources cited) [other_primary]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- correction
- Documentation level
- ship_specific
- Evidence ID
- uss-pgm-51-pgm51-pkt-1005-packet-md
-
[2]NavSource Online: Motor Gunboat/Patrol Gunboat Photo Archive, PGM-51 - construction, transfer, reclassification, specifications (verified live 2026-10-04) [other_primary]
- Locator
- NavSource 12/11051.htm header block and specifications block
- Finding type
- vessel_history
- Finding
- Documented for this hull: 'PGM-51 was built for Burma.' Laid down '26/28 May 1961' as PGM-51 by the Peterson Builders, Sturgeon Bay, WI; 'Transferred to Burma in June 1961 under the Military Assistance Program and reclassified PGM-405'; 'Fate unknown.' Specifications: displacement 100 t.; length 101'; beam 21'; draft 7.5'; speed 17 kts.; complement 17; armament one Mk 3 40mm mount, two Mk 24 twin 20mm mounts and two .50 cal. machine guns; propulsion eight 255bhp General Motors 6-71 diesel engines, two shafts. 'There is no DANFS history available for PGM-51.' No photograph of the hull exists in the archive.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1961-forward
- Population
- Peterson Builders construction trades (1960-61); Burmese crews (1961-forward)
- Limitations
- Ship-specific history only; no asbestos or material content. NavSource is a volunteer secondary compilation - the 'laid down 26/28 May 1961' line is an apparent mislabel combining the delivery dates of both Burma boats (see ev-06); transfer month (June 1961) conflicts with a secondary August 1961 'loaned' variant. 'Fate unknown' - no disposal or current-status documentation.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-01
-
[3]Shipbuilding History (T. Colton), Peterson Builders yard table, Sturgeon Bay WI - build record for this hull (verified live 2026-10-04) [other_primary]
- Locator
- Peterson yard table, '4 Motor Gunboats (PGM)' rows; yard-history header text
- Finding type
- vessel_history
- Finding
- Peterson Builders yard production table, section '4 Motor Gunboats (PGM)': 'PGM 51 | Unnamed (PGM 405) | Burma | Patrol Gunboat | 100d | 101 | 26-May-61' - delivery 26 May 1961; sister 'PGM 52 | Unnamed (PGM 406) | Burma | ... | 28-May-61'. Yard history: Martin Peterson founded Peterson Boat Works in 1907; yard built sub chasers during WWII, reorganized as Peterson Builders 1946; 'a major producer of the more complex types of small naval vessels'; closed 1998 when the site was converted for residential use (Wikipedia gives January 1996 - minor conflict).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1961
- Population
- Peterson Builders construction trades (1960-61)
- Limitations
- Build/delivery record only; no asbestos or material content. Confirms the 26-May-61 date is a DELIVERY date - NavSource's 'laid down' label is a mislabel (see ev-06). Shipbuilding History is a curated secondary table compiled from builder/registry data; not a primary contract record. Yard close date conflicts with Wikipedia (1998 vs Jan 1996) - immaterial.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-02
-
[4]Erdheim, Judith C., 'Market Time' (Department of the Navy, Naval Historical Center, September 1975; prepared for Office of Naval Research / CNO), Appendix A - Characteristics of VNN PCE and PGM, Fig. A-2 (verbatim transcription via HyperWar/ibiblio; verified live 2026-10-04) [other_primary]
- Locator
- Market Time, Appendix A, Figure A-2 'Patrol Motor Gun Boat (PGM)'
- Finding type
- historical_record
- Finding
- Official Department of the Navy characteristics for the PGM type as operated by the Vietnamese Navy (same PGM-39-class design): length 100 feet; beam 21 feet; draft 7 feet; speed 17 knots; crew 1 officer, 14 enlisted; endurance 1,000 n.mi. at 12 knots; armament 1 - 40mm single-mount Mk 3, 2 - .50-caliber, 2 - 20mm single-mount Mk 10 Mod 2. The study also documents the operational context of allied-navy PGM operations (VNN Coastal Force/Sea Force patrol organization).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1975 (document); class in service 1959-1970 build era
- Population
- Class-level; allied-navy PGM crews
- Limitations
- Class-level official characteristics for the VNN fit of the design - the Burma fit may differ (armament and crew figures conflict with NavSource's Burma-hull specs: NavSource shows twin 20mm Mk 24 mounts and complement 17 vs App. A's single Mk 10 mounts and crew of 15). Documents the class design, not this hull specifically. No asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-03
-
[5]navypedia.org, 'PGM401 patrol gunboats (1959-1961)', Myanmar (Burma) coastal forces - Burma service record for this hull (verified live 2026-10-04) [other_primary]
- Locator
- navypedia Myanmar PGM401 class table (ships and technical data sections); photo caption 'PGM406 1992'
- Finding type
- vessel_history
- Finding
- Burma/Myanmar PGM-401 class table: PGM405 built by Peterson Builders, Sturgeon Bay, USA; completed 6.1961; 'in service (2019)'. Series: PGM401-404 built by Marinette Marine (completed 8-9.1959), PGM405-406 by Peterson Builders (6.1961). Class data: 100 t standard / 141 t full; 30.8 m; 8 General Motors 6-71 diesels, 2040 hp, 2 shafts; 17 kts; diesel oil 16 t; endurance 1000 nm at 16 kts; armament 1 x 1 - 40/60 Mk 3, 2 x 2 - 20/70 Mk 24, 2 x 1 - 12.7/90; PGM405-406 fitted Raytheon 1500 radar (PGM401-404 EDO320); complement 17. Project note: 'USN PGM type, austere export service. USCG 95ft type.'
- Verification
- partial
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1961-2019
- Population
- Burmese crews (1961-forward, unverified continuity)
- Limitations
- Secondary database, not a primary registry - the 'in service (2019)' status is unverified against any official Myanmar source and may be stale. Confirms builder, completion month, and Burma series numbering. Machinery spec (8 x GM 6-71) agrees with NavSource but conflicts with a third secondary compilation (Detroit Diesel 6-110 x2 - see gaps). No asbestos or material content.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-04
-
[6]NavSource Motor Gunboat (PGM) Index - class composition and transfers; corroborated by Wikipedia 'PGM-39-class gunboat' (class design origin, MAP purpose) and Wikipedia 'List of equipment in the Union of Myanmar Navy' (serials 401-406, 1959-1961, Marinette + Peterson builders) [other_primary]
- Locator
- NavSource 12/11idx.htm 'PGM-39 Class Motor Gunboat' sections; Wikipedia class article infobox and text; Wikipedia Myanmar Navy equipment list, PGM-39-class row
- Finding type
- historical_record
- Finding
- Class context: PGM-39-class motor gunboats - PGM-39 to PGM-46 (US-built export boats: PGM-39 to -42 to the Philippines as Agusan/Catanduanes/Romblon/Palawan; PGM-43 to -46 to Burma as PGM-401 to -404), PGM-47 to -50 built in Denmark (Daphne/Havmanden/Najaden/Neptun), PGM-51 to -58 (PGM-51 to Burma as PGM-405; PGM-52 to Burma as PGM-406; PGM-53/54 to Ethiopia as PC-13/PC-14; PGM-55/56/57 to Indonesia; PGM-58 to Ethiopia as PC-15), PGM-59 to -83 to South Vietnam and other recipients. Wikipedia (needs-citations flagged secondary): 59 boats built 1959-1970 at Marinette Marine, J.M. Martinac, Peterson Builders, and Tacoma Boat; design derived from the USCG 95-ft Cape-class cutter with a five-foot hull extension, specifically designed for the U.S. Military Assistance Program; steel hull with aluminum superstructure (galvanic corrosion noted as a service-life issue).
- Verification
- partial
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1959-1970 (class build era)
- Population
- Allied-navy PGM crews; MAP program
- Limitations
- Class/era background only - establishes the export program context and sister-hull disposition, not any fact about asbestos aboard this hull. Wikipedia class article carries a needs-more-citations flag and its propulsion figure (Mercedes-Benz 12V493 TY57 x2) conflicts with hull-specific sources; treated as orientation, not authority. Myanmar equipment list is secondary compilation.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-05
-
[7]uswarships.jounin.jp PGM compilation (Japanese-language secondary database) - construction dates for this hull (verified live 2026-10-04) [other_primary]
- Locator
- jounin.jp PGM table, PGM-51 row (1960/8/16 keel, 1961/4/8 launch, 1961/5/26 completion, 1961/8 Burma loan)
- Finding type
- historical_record
- Finding
- CORRECTION + UNVERIFIED DATES: NavSource's 'Laid down 26/28 May 1961' is a mislabel - those are the delivery dates of PGM-51 (26 May 1961) and PGM-52 (28 May 1961) per the Peterson yard table (ev-02). The jounin.jp compilation gives for PGM-51: laid down 16 August 1960, launched 8 April 1961, completed 26 May 1961, loaned to Burma August 1961 and reclassified PGM-405 - the completion date matches the yard table's delivery date exactly. The keel and launch dates are unverified secondary figures carried in gaps; the August 1961 'loaned' transfer conflicts with NavSource's June 1961 transfer month.
- Verification
- partial
- Role
- correction
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 1960-1961
- Limitations
- Secondary compilation (apparently derived from Conway's/Jane's-type references); keel/launch dates could not be traced to a primary source - carried in gaps, not asserted as fact. The August-loan variant conflicts with NavSource June-transfer; unresolved. Same source notes PGM-43 to -46 plus PGM-51/52 are sometimes grouped as a 'PGM-43 class' on spec differences. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-06
-
[8]NIOSH walk-through survey report IWS 74-48, Peterson Builders Inc., Sturgeon Bay, Wisconsin (survey 15 December 1978; published November 1979; CDC Stacks) [other_primary]
- Locator
- CDC Stacks cdc/233468, abstract/metadata (8-page report IWS 74-48)
- Finding type
- gov_survey
- Finding
- Government documentation of this hull's builder yard: a NIOSH industrial-hygiene walk-through evaluated Peterson Builders (SIC-3731 ship building and repairing) for health and safety hazards of paint materials. Approximately 731 employees worked in the boat production yard; the company had no industrial hygiene program; indoor paint spraying with poor ventilation and respirator use documented. The authors concluded Peterson would be an excellent facility for further study given the large volume of paint used and steady workload.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1978-1979
- Population
- Peterson Builders workforce (~731 employees, 1978)
- Limitations
- Yard-level survey, not a hull record - and it is a PAINT-materials hazard evaluation: it contains NO asbestos evaluation, exposure measurement, or material inventory. It postdates this hull's construction by ~17 years (yard still active, workforce documented at 731). Does not establish asbestos presence, use, or exposure for this hull or this yard.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-07
-
[9]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (full text blocked, HTTP 403)
- 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 - postdating this hull's 1960-61 construction.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1979
- Population
- Navy shipyard workers; asbestos program review
- Limitations
- Program-level documentation of U.S. Navy shipbuilding practice; supports era context only, not any fact specific to this hull. Caveat particular to this record: the hull was a MAP export built to a U.S. design at a commercial Wisconsin yard - Navy-spec materials practice is a reasonable but unverified inference for export-fit construction. Full text not retrieved (gao.gov blocks automated fetch, HTTP 403, standing) - content via product-page description.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-08
-
[10]U.S. EPA Superfund Site Profile, PETERSON BUILDERS INC (EPA ID WID096828975), 107 East Walnut Street, Sturgeon Bay, WI - NPL status and deferral (verified live 2026-10-04) [other_primary]
- Locator
- EPA Superfund site profile WID096828975
- Finding type
- environmental_record
- Finding
- EPA Superfund profile exists for the Peterson Builders site: 'Not on the NPL', non-NPL status 'Deferred to RCRA (Subtitle C)' - i.e., the former yard site's environmental management was handled under hazardous-waste (RCRA) rather than Superfund authorities.
- Verification
- verified
- Role
- archival_lead
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- undated profile
- Population
- Peterson Builders site/environmental file
- Limitations
- Archival lead only: the profile establishes that the builder yard had a federal hazardous-waste/environmental file; it contains no asbestos-specific content and nothing about this hull. Any RCRA case file for the site (Wisconsin DNR / EPA Region 5) is the next repository for yard-level material or demolition records.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-09
-
[11]Era inference built on: NavSource propulsion specs (8 x GM 6-71 diesels, 2 shafts - diesel plant, no steam); 1960-61 build window at Peterson Builders (yard table); DoN class characteristics (Market Time App. A); GAO HRD-80-2 substitution-era documentation (ev-08) [other_primary]
- Locator
- NavSource specifications block; Peterson yard table; Market Time App. A Fig. A-2; GAO HRD-80-2
- Finding type
- asbestos_application
- Finding
- A 100-ton diesel motor gunboat built 1960-61 at a U.S. commercial yard to a U.S. Navy MAP design precedes the early-1970s asbestos-substitution era; era-consistent candidate materials aboard a small diesel patrol craft of this period are engine/exhaust lagging, gaskets, valve packing, electrical insulation, and interior deck/surface coverings. The plausible material set is materially narrower than for steam vessels - no boiler or turbine lagging pathway exists; eight small truck-derived diesels (GM 6-71) in an austere 101-ft hull present limited lagging volume.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-04
- Study period
- 1960-present
- Population
- Peterson Builders construction trades (1960-61); Burmese crews (1961-forward) - no U.S. Navy crew population
- Limitations
- Class/era inference only - no hull-specific material list, insulation survey, or work package located for PGM-51. Names era-candidate applications, not confirmed installed materials; no quantity; no manufacturer attribution. Export-fit (MAP austere variant) may have differed from USN fits - materials practice on FMS export hulls is not documented here.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-10
-
[12]Batch-8621 search ledger (this record): NavSource vessel page + class index; Peterson yard table (Shipbuilding History); DoN Market Time App. A; navypedia Myanmar PGM401 class; Wikipedia class article + Myanmar Navy equipment list; jounin.jp PGM compilation; NIOSH IWS 74-48; GAO HRD-80-2 product page; EPA WID096828975; NHHC DANFS (no entry); NVR (no entry); NARA catalog (blocked); CourtListener API v4 (3 of 4 base queries complete, all negative/noise; 4th paced - see sl-10) [other_primary]
- Locator
- search_ledger rows sl-uss-pgm-51-pgm51-01 through -14
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, work package, or verified litigation naming PGM-51 or Burma PGM-405 was found in the public sources searched. CourtListener: 'USS PGM-51' opinion = 0 results; 'USS PGM-51' docket = 137 results, all name collisions (none of the 20 returned dockets contains 'PGM-51' or vessel-related text - tokenized noise including unrelated FLSA, RICO, talc MDL, and criminal matters); 'PGM-51' opinion = 150 results, all name collisions (no 'PGM' text in any returned snippet). The 'PGM-51' docket base query was deferred by the fleet-wide request pacer - logged as blocked/pending, not a negative result. Secondary sweeps surfaced no law-firm marketing claims for this hull either - an unusually quiet record.
- Verification
- verified
- Role
- negative_finding
- Documentation level
- ship_specific
- Accessed
- 2026-10-04
- Study period
- 2026-10-04
- Limitations
- Absence of a located public record does not prove absence of asbestos aboard. One of four CourtListener base queries incomplete at report time (paced, not run) - the litigation sweep is nearly but not fully closed; re-run 'PGM-51' type=r when the pacer frees. MAP delivery/transfer documentation (DSCA/MAP records, deck or delivery logs) and Myanmar Navy service records are undigitized or inaccessible. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-pgm-51-pgm51-11