Evidence
9 evidence entries recorded; each entry has a stable permalink (#ev-1 … #ev-9).
-
[1]research packet 896-packet.md (4 sources cited) [nhhc_danfs]
- Finding type
- vessel_history
- Finding
- Identity packet verdict: VERIFIED
- Verification
- verified
- Role
- supporting
- Documentation level
- ship_specific
- Evidence ID
- uss-jasper-pc486-pkt-896-packet-md
-
[2]DANFS, Jasper II (PC-486) - construction, sponsor, commissioning, Northwestern Sea Frontier/Aleutians service, Canal Zone ASW duty, 1956 naming, decommissioning, Venezuelan sale (live NHHC page verified 2026-10-03) [nhhc_danfs]
- Locator
- DANFS Jasper II (PC-486) entry, spec block + service narrative
- Finding type
- vessel_history
- Finding
- DANFS record for this hull: laid down by Consolidated Shipbuilding Corp., Morris Heights, N.Y., 25 October 1941; launched 25 January 1942, sponsored by Mrs. A. B. Miller; commissioned 14 May 1942, Lt. (j.g.) Drayton Cochran in command. After shakedown assigned to the Northwestern Sea Frontier, operating out of Alaska and the Aleutians during the war, patrolling North Pacific shipping lanes and escorting convoys from San Francisco and Seattle to Alaska. Post-WWII assigned to ASW duty in the Canal Zone; 1946-1959 operated out of the Canal Zone on ASW patrol and air-sea rescue missions. On 5 February 1952 rescued 18 people adrift for 6 days on disabled Columbian schooner Gloria; three years later rescued 10 people from sunken U.S. tuna boat Toni B in the Caribbean, 90 miles off the Panama coast. Named Jasper 15 February 1956; decommissioned 30 April 1959; struck from the Navy List 1 May 1959; sold October 1960 to Venezuela, serving as Mejillon (P-1). Spec block: dp. 295; l. 174'; b. 23'; dr. 8'; s. 20 k.; cpl. 58; a. 1 3", 1 40mm., 5 20mm., 2 rkt, 2 dcp., 2 dct.; cl. PC-451. Namesake: 'an opaque and impure variety of quartz, usually red in color, used as a gem'; PC-486 was named for towns in Alabama, Indiana, and Texas.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1960
- Population
- Consolidated Shipbuilding construction trades (1941-42); crew 1942-1959 (design complement 58)
- Limitations
- Ship-specific history only; no asbestos or material content. DANFS spec block lists the class as 'PC-451' while NavSource, uboat.net, and the class literature use 'PC-461 class' - the PC-451/452 experimental antecedent designation; carried in gaps. 'Columbian' is the DANFS spelling (Colombia). The 1955 Toni B rescue date is approximate in the source ('three years later' from the 1952 rescue).
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-01
-
[3]NavSource Online: Submarine Chaser Photo Archive, Jasper (PC 486) ex-PC-486 - designation timeline, specifications, propulsion detail, NARA-captioned photography (live navsource.net URL verified 2026-10-03); corroborated by uboat.net Allied Warships, USS PC-486 ship page (ship 8508) [other_primary]
- Locator
- NavSource 12/010486.htm header block, specifications block, commanding-officer table
- Finding type
- vessel_history
- Finding
- NavSource timeline for this hull (PC-461 Class Submarine Chaser): laid down 25 October 1941 at Consolidated Shipbuilding Corp., Morris Heights, NY; launched 25 January 1942; commissioned USS PC-486 14 May 1942; named Jasper 15 February 1956; decommissioned 30 April 1959; struck from the Navy Register 1 May 1959; sold to Venezuela in October 1960 and renamed Mejillon (P-1); fate unknown. Specifications: displacement 280 t. (lt), 450 t. (fl); length 173'8"; beam 23'; draft 10'10"; speed 20.2 kts; complement 65; armament one 3"/50 dual purpose gun mount, one 40mm gun mount, three 20mm guns, two rocket launchers, four depth charge projectors, two depth charge tracks. Propulsion: two 1,440 bhp Fairbanks Morse 38D8 1/8 diesel engines (Serial No. 832227 and 832228), Westinghouse single reduction gear, two shafts. Commanding officers listed: LTJG Drayton Cochran, USN (14 May 1942); LT Robert Russell Robertson, Jr., USN (June 1957). Call sign November-Bravo-Sierra-Foxtrot. uboat.net corroborates the milestones (ordered 26 December 1940; end service 30 April 1959) and lists wartime commanding officers Drayton Cochran, USNR (14 May 1942 to early 1943) and Lt. Robert Bacon Whitney, USNR (from early 1943).
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1960
- Population
- Construction trades (1941-42); crew 1942-1959; Venezuelan Navy crew post-1960
- Limitations
- NavSource is a volunteer secondary compilation, not a primary registry - milestone dates track DANFS exactly here, but its specification block conflicts with DANFS on displacement (280/450 vs 295), draft (10'10" vs 8'), complement (65 vs 58), and 20mm gun count (3 vs 5); DANFS carried where conflicting, conflicts logged in gaps. Contains no asbestos content. 'Fate unknown' after Venezuelan transfer - no authoritative Venezuelan disposition record located.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-02
-
[4]NARA photograph 80-G-89442, 'USS PC-486 off the coast of Kiska Island, Alaska on 18 September 1943' (National Archives photo caption transcribed in NavSource) [other_primary]
- Locator
- NavSource 12/010486.htm photo caption (National Archives photo 80-G-89442)
- Finding type
- historical_record
- Finding
- A Bureau of Ships-series NARA photograph (80-G-89442) documents this hull off Kiska Island, Alaska, on 18 September 1943 - weeks after the August 1943 Allied reoccupation of Kiska - corroborating the DANFS Aleutians assignment. Physical-presence documentation for the North Pacific war service period.
- Verification
- partial
- Role
- archival_lead
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1943-09-18
- Population
- Crew aboard during Aleutians service (1943)
- Limitations
- Archival lead only: establishes presence off Kiska 18 Sep 1943, not any work or material record. NARA catalog is JS-rendered and the NAID could not be independently fetched this session; photo identifier and caption transcribed via NavSource. No asbestos content.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-03
-
[5]Colton, T., ShipbuildingHistory.com, 'Consolidated Shipbuilding, Morris Heights NY' yard history and vessel table [reputable_press]
- Locator
- shipbuildinghistory.com consolidated.htm - Consolidated Shipbuilding Co. (1920-1945) table, hull 3113 row; yard-history narrative header
- Finding type
- historical_record
- Finding
- The standard shipyard reference table for this hull's builder records PC 486 as Consolidated yard hull number 3113, type 'Sub Chaser', delivered 14 May 1942 to the US Navy; disposition 'Named Jasper 1956, to Venezuela 1960 as Mejillon (P-1).' Sister hulls in the same Consolidated run: PC 483 (yard 3110, later Rolla, to Venezuela 1961 as Camaron P-08), PC 484 (3111, later Cooperstown, to Venezuela 1961 as Togogo P-09), PC 485 (3112, to Korea 1952 as Han Ra San PC 705), PC 487 (3114, later Larchmont, to Venezuela 1960). Yard context: Consolidated Shipbuilding at Morris Heights (Matthewson Road, southern end of present Roberto Clemente State Park, Bronx) was a small-craft/yacht builder formed from Gas Engine & Power Co. and Charles L. Seabury Co.; after WWII it bought the Robert Jacob and B. F. Wood yards on City Island and closed Morris Heights; ceased active boatbuilding in 1958.
- Verification
- verified
- Role
- context
- Documentation level
- ship_specific
- Accessed
- 2026-10-03
- Study period
- 1941-1960
- Population
- Consolidated Shipbuilding trades, Morris Heights (1941-42)
- Limitations
- Specialist secondary reference (Tim Colton's shipbuildinghistory), not a government record - yard-number and delivery data are table entries consistent with DANFS dates. Yard-history narrative is secondary. No asbestos content; does not document materials or working conditions at the Morris Heights yard.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-04
-
[6]Bureau of Ships, Navy Department, 'USA - PC-487 USS PC-487 Booklet of General Plans (194X)' - BuShips general arrangement plans for the sister hull (Internet Archive scan) [other_primary]
- Locator
- archive.org/details/pc487bogp194x - sheet 02 'General Dimensions & Data' (complement table); sheet 04 'Inboard Profile' (engine room B-1, aux. eng. rm. B-201-E)
- Finding type
- historical_record
- Finding
- The BuShips Booklet of General Plans for PC-487 - the sister hull in this hull's Consolidated build run (yard 3114 vs this hull's 3113) - documents the class arrangement as built by the same yard in the same period: nine sheets covering dimensions and data, outboard and inboard profiles, deckhouse and platform decks. The Dimensions & Data sheet gives design complement 58 (3 officers, 1 chief petty officer, 54 enlisted men) - matching the DANFS spec figure for this hull - and the inboard profile shows the machinery arrangement: diesel engine room B-1 and auxiliary engine room B-201-E amidships with the funnel/uptake above, consistent with the Fairbanks Morse diesel plant (no boiler spaces).
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- circa 1942-1944
- Population
- Design complement 58 (class documentation)
- Limitations
- Sister-hull document, not this hull's plans - class_or_era only. An arrangement drawing set: material callouts (insulation, lagging specifications) are not legible or not present on the sheets examined; the booklet does not establish materials aboard this or any hull. Scanned images (no text layer) - read visually on sheets 02 (dimensions/data) and 04 (inboard profile).
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-05
-
[7]Era inference built on: DANFS spec block + NavSource specifications (2 x Fairbanks Morse 38D8 1/8 diesels, Westinghouse gear, 2 shafts); BuShips PC-487 Booklet of General Plans (diesel machinery arrangement, no steam plant); GAO HRD-80-2 program documentation (see ev-07) [other_primary]
- Locator
- DANFS spec block; NavSource specifications; BuShips PC-487 BoGP inboard profile; GAO HRD-80-2
- Finding type
- asbestos_application
- Finding
- A steel-hulled diesel patrol craft built 1941-42 sits inside the Navy's documented asbestos-use era; era-standard applications aboard a small diesel combatant of this period were machinery and diesel-exhaust lagging, thermal insulation, gaskets and flange packing, valve stem packing, electrical insulation, and interior deck coverings. As a diesel vessel she carried no steam plant - the boiler/turbine lagging pathway of steam vessels does not apply; the asbestos-relevant systems are the diesel machinery/exhaust, piping, and habitability materials in a small, compartmented hull.
- Verification
- inferred
- Role
- supporting
- Documentation level
- class_or_era
- Accessed
- 2026-10-03
- Study period
- 1941-1960
- Population
- Consolidated construction trades (1941-42); crew 1942-1959 incl. Canal Zone era; Venezuelan crew post-1960
- Limitations
- Class/era inference only - no hull-specific insulation survey, material list, spec sheet, or work package located for PC-486. Names era-standard applications, not confirmed installed materials. No quantity, no manufacturer attribution, no present-day presence. The builder's yard is undocumented at yard level for asbestos (not an Atlas shipyards.json entry; no government survey located).
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-06
-
[8]GAO, Navy Efforts To Protect Workers From Asbestos Exposure, HRD-80-2 (Oct 18, 1979) [gao]
- Locator
- GAO product page HRD-80-2 (highlights/summary text)
- 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 (1941-42) and U.S. service era (1942-59); the Navy's 1975 policy was to remove and replace with nonasbestos materials only insulation that was damaged or had to be removed to accomplish necessary repairs, modified in 1979 to include selectively replacing asbestos insulation in high-maintenance areas.
- Verification
- verified
- Role
- context
- Documentation level
- class_or_era
- 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. Direct fetch of gao.gov returns HTTP 403 to automated clients (confirmed this session); product-page description retrieved via Firecrawl - full report text not extracted.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-07
-
[9]Batch-7861 search ledger (this record): NHHC DANFS (live); NavSource; uboat.net; NavalCoverMuseum; Colton shipbuildinghistory; BuShips PC-487 BoGP (archive.org); GAO product page; NVR (no entry - pre-coverage disposal); NARA leads; secondary web litigation sweep [other_primary]
- Locator
- search_ledger rows sl-uss-jasper-pc486-01 through -14
- Finding type
- historical_record
- Finding
- No qualifying ship-specific asbestos record located: no asbestos survey, abatement contract, hazmat disclosure, or litigation naming PC-486 / USS Jasper was found in the public sources searched (see search_ledger). Secondary web sweeps surfaced only law-firm marketing material (mesothelioma.net patrol-boat listicle naming 'USS Jasper' without primary sourcing - excluded by source policy). CourtListener status recorded in search_ledger (fleet pacing this session).
- Verification
- verified
- 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 - a 1942 steel diesel combatant is era-consistent with asbestos materials. NARA deck logs, builder records, and Venezuelan service/disposal records are undigitized or unlocated leads. Does not establish or defeat any claim of exposure or legal eligibility.
- Atlas source
- true
- Evidence ID
- ev-uss-jasper-pc486-08
