ROGERS, Chief Judge:
In this certified appeal
we are asked to decide whether the District of Columbia Workers’ Compensation Act of 1979, D.C. Code § 36-301
et seq.
(1988 Repl.) (the 1979 Act), covers a worker’s injury or disease if the employment events giving rise to the injury occurred before the 1979 Act took effect, but the worker did not become aware of the injury and its job-relatedness until after that time. We hold that the 1979 Act applies unless there is no subject matter jurisdiction of a claim under that Act or other state law, in which event, to avoid depriving an injured worker of any workers’ compensation coverage, the Long-shore and Harbor Workers’ Compensation Act, 33 U.S.C. §§ 901-50 (1982) (LHWCA), as extended by Congress to District of Columbia private sector workers in 1928, D.C. Code § 36-501
et seq.
(1973) (the 1928 Act), will apply.
I
The relevant facts are not in dispute.
Respondent Robert Gardner worked for nine years as a construction worker on the Washington Metropolitan Area Transit Authority’s subway project. His last employer was Railco Multi-Construction Company (Railco), a District of Columbia employer for whom he worked from September 1981 until September 15, 1982, when the project was completed. Until June 1982 he worked for Railco at the L’Enfant Plaza station in the District of Columbia. Thereafter, from June to September 1982, he worked in Virginia.
In January 1983 Gardner filed a claim for worker compensation benefits under the 1928 Act. He alleged that as a result of his exposure to noisy machinery while employed by Railco in the District of Columbia and in Virginia, he had suffered a hearing loss.
An administrative law judge found that Gardner first became aware of his hearing loss on September 16, 1982. Acknowledging that the District’s new workers’ compensation act, the 1979 Act, had taken effect,
the administrative law judge ruled that Gardner’s injury was covered by the 1928 Act because “[ajlmost all of this injury really occurred prior to" the
effective date of the District’s Act.
Petitioners Raileo and its insurance carrier, Lumbermens Mutual Casualty Company,
appealed to the Benefits Review Board (the Board), which affirmed the decision of the administrative law judge on different grounds, relying in part on the 1984 amendments to the LHWCA.
Gardner v. Railco Multi-Construction Co.,
18 BRBS 264 (1986)
(Gardner I).
On remand from the United States Court of Appeals for the District of Columbia Circuit for reconsideration in light of
Keener v. Washington Metro. Area Transit Auth., supra,
255 U.S.App.D.C. 148, 800 F.2d 1173, the Board reaffirmed its decision on the coverage issue.
Gardner v. Railco Multi-Construction Co.,
19 BRBS 238 (1987)
(Gardner II).
Raileo then appealed to the United States Court of Appeals for the District of Columbia Circuit. Following briefing and oral argument, the court certified the question of law to this Court.
II
Before us is a question of law regarding legislative intent and we apply the usual standard of review.
See Thomas v. District of Columbia Dep
't
of Employment Servs.,
547 A.2d 1034, 1037-38 (D.C.1988). Accordingly, to determine which statute applies to a claim, we review the language of the statutes and their legislative histories in light of the purposes of the workers’ compensation statutory scheme.
Id.
Such a question involves considerations generally not invoking the reasons for which courts will defer to agency expertise.
Keener, supra,
255 U.S.App.D.C. at 154, 800 F.2d at 1179 (whether amended statute applies to a claim);
O’Connell, supra,
495 A.2d at 1141 9 (jurisdiction of court);
Castorina v. Lykes Bros. S.S.,
578 F.Supp. 1153, 1159 n. 3 (S.D.Tex.1984) (agency’s interpretation on question of law given significant consideration but not binding),
aff'd,
758 F.2d 1025 (5th Cir.),
cert. denied,
474 U.S. 846, 106 S.Ct. 137, 88 L.Ed.2d 113 (1985);
Petrou Fisheries, Inc. v. I.C. C.,
727 F.2d 542, 545 (5th Cir.1984) (issues of pure statutory construction not within agency’s field of technical expertise to which court necessarily owes deference). We also are guided by the well-established principle in this jurisdiction that workers’ compensation statutes are to be liberally construed for the benefit of the employee in accordance with the humanitarian nature of the statutes generally.
See Meiggs v. Associated Builders, Inc.,
545 A.2d 631, 637 (D.C.1988), ce
rt. denied,
— U.S. -, 109 S.Ct. 3178, 104 L.Ed.2d 1040 (1989);
Ferreira v. District of Columbia Dep’t of Employment Servs.,
531 A.2d 651, 655 (D.C.1987), citing decisions of the United States Court of Appeals for the District of Columbia Circuit;
see also Dunston v. District of Columbia Dep’t of Employment Servs.,
509 A.2d 109, 111 (D.C.1986) (citing
Wheatley v. Adler,
132 U.S.App.D.C. 177, 183, 407 F.2d 307, 313 (1968) (en banc)).
The United States Court of Appeals posed the issue of how to define the relevant “date of injury” in long-latency occupational diseases for purposes of determining whether the 1979 or the 1928 Act provides coverage, and identified it as a question of local and not federal law. Unlike an accidental injury, in which the trauma effects are felt almost immediately, it is unclear in long-latency diseases whether the injury occurs when the employee is exposed to the employment event (time of last exposure theory) or when the disease actually manifests itself (the date of man
ifestation theory).
See generally Castorina v. Lykes Bros. S.S., supra,
758 F.2d at 1029-30. The court suggested that if the manifestation rule is adopted, then the injury occurred when Gardner first became aware of his hearing loss on September 16, 1982, and the 1979 Act applies; if the exposure rule is adopted, then the injury occurred prior to 1979 and the 1928 Act applies, pursuant to the general savings statute. The court noted, however, that this court is free to adopt some other alternative, including the one we adopt today.
Railco contends that the express and complete repeal of the 1928 Act precludes its application to an occupational disease arising thereafter, regardless of when exposure occurred, and that the 1979 Act suffices to provide coverage for Gardner so long as the injury is manifested after the effective date of the 1979 Act; the matter of where Gardner worked while covered by the 1979 Act, Railco claims, is a compensation issue which should not determine whether the 1979 or 1928 Act applies. Ra-ilco also asserts that the general savings clause does not provide Gardner coverage under the 1928 Act because Gardner’s exposure alone did not give rise to a proper claim.
Respondents Gardner and the Office of Workers’ Compensation Programs of the United States Department of Labor (OWCP) contend that the relevant employment events determine coverage, and that here substantially all the employment events occurred prior to the 1979 Act, giving rise to coverage under the 1928 Act. They point out that Gardner, who worked in Virginia from June to September 1982, may be without coverage under the 1979 Act because of its geographic limitations on coverage,
see
D.C.Code § 36-303(a) (1988 Repl.), and contend that even if Gardner’s rights under the 1928 Act were inchoate as of the effective date of the 1979 Act, Railco’s liability arose, and must be recognized, under the 1928 Act, particularly where the claimant may be provided no substitute coverage by the 1979 Act.
Respondents also refer to a regulation promulgated by the Secretary of Labor providing that the 1928 Act “applies to all claims for injuries or deaths based on employment events that occurred prior to [the effective date of the 1979 Act],” 51 Fed.Reg. 4281, 20 C.F.R. § 701.101(b) (1987), which they claim reflects “the fundamental nature and operation of the LHWCA and the 1928 Act.”
A.
In 1928 Congress extended the provisions of the LHWCA to District of Columbia private sector employees and provided that the local act would be administered by the United States Department of Labor with review of departmental administrative decisions by the United States Court of Appeals for the District of Columbia Circuit. D.C.Code §§ 36-501, -502 (1973);
see District of Columbia v. Greater Washington Cent. Labor Council,
442 A.2d 110, 112, 116 (D.C.1982),
cert. denied,
460 U.S. 1016, 103 S.Ct. 1261, 75 L.Ed.2d 487 (1983). Following the enactment by Congress of
the District of Columbia Self Government and Governmental Reorganization Act in 1973,
the Council of the District of Columbia enacted the 1979 Act.
See
D.C.Code § 36-301
et seq.
(1988 Repl.). The 1979 Act, designed to enable the District of Columbia to be competitive with Maryland and Virginia in attracting and retaining business, narrowed the scope of coverage
and lowered the level of benefits available to injured workers.
See Hughes v. District of Columbia Dep’t of Employment Servs.,
498 A.2d 567 (D.C.1985);
O’Connell, supra,
495 A.2d at 1141. In many other respects, however, it retained provisions of the 1928 Act.
The 1979 Act is administered by the District of Columbia Department of Employment Services (DOES) and provides for appeals from the agency’s decisions to this court.
It took effect after its validity was upheld by this court.
See O’Connell, supra,
495 A.2d at 1141 & n. 14 (citing
District of Columbia v. Greater Washington, supra,
442 A.2d 110).
The 1979 Act repealed the 1928 Act.
However, under the general savings statute of the United States Code, the 1928 Act continues in effect as it existed in 1982, the effective date of the repeal of the 1928 Act, and without regard to subsequent amendments to the federal LHWCA, for the purpose of “sustaining any proper action or prosecution for the enforcement of [any] penalty, forfeiture or liability ... incurred under such statute.” 1 U.S.C. § 109 (1982);
see Keener, supra,
255 U.S.App.D.C. at 154, 800 F.2d at 1175 (citing
O’Connell, supra,
495 A.2d at 1141-42);
see also Estep, supra,
546 A.2d at 378.
B.
The 1979 Act provides, in relevant part, that “[t]his chapter shall apply in respect to the injury or death of an employee of an employer.... provided that at the time of such injury or death this employment is principally localized in the District of Co-lumbia_” D.C.Code § 36-303(a) (1988 Repl.). The definition of injury, in pertinent part, is an:
accidental injury or death arising out of and in the course of employment, and such occupational disease or infection as arises naturally out of such employment or as naturally or unavoidably results from such accidental injury....
D.C.Code § 36-301(12) (1988 Repl.). The 1979 Act provides that liability for compensation for any generally recognized occupational disease “rests with the employer of last known exposure,” D.C.Code § 36-310
(1988 Repl), and adopts a “discovery rule” for the time of filing a claim for compensation, stating that such time does not begin to run “until the employee or beneficiary is aware, or by the exercise of reasonable diligence should have been aware, of the relationship between the injury or death and the employment.” D.C.Code § 36-314(a) (1988 Repl.).
Although neither these nor any other provision of the 1979 Act specifies when the “time of injury” occurs where an employee does not become aware of an occupational disease until long after the injurious exposure, and the legislative history does not refer to a decision by the D.C. Council to adopt the manifestation rule, we conclude that adoption of this rule is most consistent with the intent of the D.C. Council.
In defining the time of the discovery of the injury under D.C.Code § 36-314(a) as the relevant point for determining when an employee has a claim for compensation, the D.C. Council did not change the language that was in the 1928 Act, as amended in 1972. The 1979 Act is modelled on the LHWCA in other respects as well,
see Grillo, supra,
540 A.2d at 749 n. 15, and thus, decisions under the 1928 Act and LHWCA are instructive.
See Meiggs v. Associated Builders, Inc., supra,
545 A.2d at 635 (in adopting statute modelled after statute in another jurisdiction, legislature deemed to have adopted judicial construction as well);
Dunston, supra,
509 A.2d at 111 n. 2;
United States v. Brown,
422 A.2d 1281, 1284 (D.C.1980) (Congress presumed to be aware of preexisting statutes).
Under the LHWCA the courts held that the time of injury for purposes of determining the date when the statute of limitations begins to run is the time of manifestation of a disease or injury.
Sun Shipbuilding & Dry Dock Co. v. Bowman,
507 F.2d 146, 150 (3d. Cir.1975);
Travelers Ins. Co. v. Cardillo, 225 F.2d
137, 142-43 (2d Cir.),
cert. denied,
350 U.S. 913, 76 S.Ct. 196, 100 L.Ed. 800 (1955). The rule also was adopted for determining the amount of compensation to which the injured occupational disease claimant is entitled.
See, e.g., Todd Shipyards Corp. v. Black,
717 F.2d 1280, 1291 (9th Cir.1983),
cert. denied,
466 U.S. 937, 104 S.Ct. 1910, 80 L.Ed.2d 459 (1984). As explained by the Ninth Circuit Court of Appeals, the manifestation rule best accomplishes the purposes, of the LHWCA in compensating employees for the loss of wage earning capacity resulting from occupational injury or disease since the statute “necessarily focuses on
future
earning capacity rather than on some past period of employment,” and “is far more likely to insure that injury workers will be fairly compensated for their lost future earning capacity.”
Todd Shipyards, supra,
717 F.2d at 1289 (emphasis in original).
Recently, a federal court adopted the manifestation rule for choosing between two versions of the LHWCA. In
Castori-
na v. Lykes Bros. Steamship, supra,
758 F.2d 1025, the court held that, even though the claimant was exposed to asbestos between 1965 and 1972, the LHWCA as amended in 1972 applied to the claimant’s injury, which was diagnosed in 1979. In concluding, for purposes of determining which statute to. apply, that the date of injury “is most realistically defined as the date that the disease actually manifests itself,”
id.
at 1031, the court relied on Judge Learned Hand’s observation in
(Grain Handling Co. v. Sweeney,
102 F.2d 464, 466 (2d Cir.),
cert. denied,
308 U.S. 570, 60 S.Ct. 83, 84 L.Ed. 478 (1939)), that the LHWCA “is not concerned with pathology, but with industrial disability; and a disease is no disease until it manifests itself.”
As the court noted, mere exposure to injurious elements does not necessarily mean that the employee will contract an occupational disease.
See Castorina, supra,
758 F.2d at 1031.
The trend toward applying the manifestation rule in a number of contexts, including coverage, is also evident in state workers’ compensation decisions. Professor Larson reports:
In contrast with accidental injury cases, in which there are usually two or more distinct “injuries,” occupational disease cases typically involve long periods of exposure during which the disease is latent or even asymptomatic. In the search for an identifiable instant in time which can be used to determine when the “injury” occurred for purposes of determining which year’s statute to apply, and who is the last employer for purposes of the last injurious exposure rule, the date of disability [i.e. the date of manifestation] is frequently chosen.
4 LARSON’S WORKMEN’S COMPENSATION LAW § 95.25(a), at 17-149-50 and cases cited therein.
C,
Adoption of the manifestation rule, which means that the 1979 Act would apply in long-latency cases, could work unintend
ed hardships as the result of substantive changes made in the 1979 Act regarding coverage. This appears to be the concern underlying the U.S. Department of Labor’s position in support of application of the 1928 Act. Indeed, it is how we view the Secretary’s promulgation of a regulation to assure coverage in light of uncertainties under the 1979 Act and its regulations and. indications of the administrative interpretation of the 1979 Act.
Under the 1979 Act, if “at the time of the injury the employment was [not] principally located in the District,” D.C.Code § 36-303, there is no subject matter jurisdiction, and such claimants would be without any workers’ compensation coverage under District of Columbia law.
Most jurisdictions adopting the manifestation rule do so to give occupational disease claimants the benefit of expanded coverage or benefits under the amended statute, the courts viewing the amendments as fulfilling the purpose of assuring compensation for disabled workers.
The statutory trend in the District of Columbia has been the reverse, however, starting with broad coverage and generous benefits levels under the 1928 Act and moving to narrower coverage and lower benefits under the 1979 Act.
The coverage concern of the D.C. Council undoubtedly arose from the broad interpretation by the courts of coverage under the LHWCA.
Given the Council’s express statement that its amendments would not prove inequitable for injured workers,
we conclude, that in narrowing subject matter jurisdiction under the 1979 Act to employment "principally localized” in the District of Columbia, the Council fairly assumed that an injured worker who did not meet that requirement would be “principally localized” elsewhere where coverage would be available.
There is nothing to suggest that the Council intended such workers to resort to tort remedies if they were not
covered by the 1979 Act,
or that the Council intended to change the fundamental nature of the District’s workers’ compensation scheme assuring compensation for disability in an efficient and economical matter.
See Meiggs, supra,
545 A.2d at 637.
In addition, the principles of retroactivity dictate against applying a statute where doing so would be “manifestly unjust.”
Hastings v. Earth Satellite Corp.,
202 U.S.App.D.C. 85, 92-94, 628 F.2d 85, 92-94,
cert. denied,
449 U.S. 905, 101 S.Ct. 281, 66 L.Ed.2d 137 (1980) (citing
Bradley v. School Board,
416 U.S. 696, 711, 94 S.Ct. 2006, 2016, 40 L.Ed.2d 476 (1974)). Although it is true, as Railco asserts, that Gardner had no legitimate expectation that the 1928 Act would forever prescribe the precise extent of his workers’ compensation remedy for a disability derived from a future injury,
he certainly had a legitimate expectation that he would be covered by some workers’ compensation scheme for injuries incurred from his employment with Railco (regardless of whether he would in fact actually receive disability benefits).
See
note [26],
supra.
This expectation is consistent with the “liability incurred” language of the federal savings clause, see
supra
note [16], and several general rules which have emerged from state decisions to ensure coverage to injured workers under amended statutes.
See also Greene v. Owens-Corning Fiberglas Corp.,
682 F.Supp. 304, 307 (M.D.La.1988) (employer’s liability is incurred for acts which occurred during employment relationship);
Agostin v. Pittsburgh Steel Foundry Corp.,
354 Pa. 543 at 547-50, 47 A.2d 680 at 683 (1946) (law at time of exposure gives rise to substantive right to compensation, notwithstanding procedural changes in later amendment);
Todd Shipyards Corp. v. Black, supra,
717 F.2d at 1291 (coverage under LHWCA does not usually terminate because injuries manifest themselves after employment has ended);
Pennsylvania Nat’l Mut. Casualty Ins. Co. v. Spence,
591 F.2d 985 (4th Cir.),
cert. denied,
444 U.S. 963, 100 S.Ct. 448, 62 L.Ed.2d 375 (1979) (employer’s insurance carrier liable for death benefits arising from the employee’s death in 1972 even though its policy with employer terminated in 1971). Even Railco distinguishes between cases involving “a change in the nature or location of the work, which gives rise to a question of subject jurisdictional coverage,” and cases involving only a “temporal coverage issue, that is, whether an amendment enacted between the time of exposure and manifestation applies to bar the claim,” and concede that the former category of cases “may properly be resolved with reference to the time of exposure because the mere fact of later non-covered exposure should not defeat the claim.” The federal courts also have recognized the continued availability of workers’ compensation coverage under the LHWCA where state law is inadequate. Cf
. Sun Ship, Inc. v. Pennsylva
nia,
447 U.S. 715, 100 S.Ct. 2432, 65 L.Ed.2d 458 (1980) (Congress intended LHWCA to have concurrent jurisdiction with state compensation laws to remedy paucity of state coverage);
Todd Shipyards, supra,
717 F.2d at 1286 n. 5 (no guarantee that claimant would be fully covered by states’ workers’ compensation statute).
D.
Accordingly, we hold that the 1979 Act applies to Gardner’s claim unless he is deprived of coverage under that statute, and under any other state statute, in which event the 1928 Act will apply. The 1979 Act applies because his disease did not manifest itself until after the 1979 Act became effective and the employer of last exposure, Railco, was his employer at the time of the last exposure and at the time the disease became manifest. Our holding is consistent with the intent of the D.C. Council to replace the 1928 Act with an economically competitive workers’ compensation scheme in the 1979 Act and with the rule against retroactive application of statutes affecting substantive rights. Affording coverage under the 1928 Act where the employer is the same at the time of the injurious exposure as well as at the time of manifestation after the effective date of the 1979 Act also is consistent with such indications as there are that the Council did not intend for an injured employee to be without workers' compensation coverage as a result of the enactment of the 1979 Act.
Thus, an occupational injury claimant who meets both the temporal and geographic jurisdictional requirements of the 1979 Act will be covered by the 1979 Act, and, like accidental injury victims covered by the 1979 Act, subject to the benefit levels of the 1979 Act. This is not a retroactive application of the new statute since only the claimant’s remedy is affected. A worker whose claim is covered by the 1979 Act cannot seek compensation under the more generous 1928 Act just because some of the claimant’s exposure occurred prior to the effective date of the 1979 Act.
Pursuant to our holding, we anticipate that most long-latency cases will be adjudicated under the 1979 Act, which accords with the D.C. Council’s intent to “divorce[ ] the local workers’ compensation system entirely from the [LHWCA].”
O’Connell, supra,
495 A.2d 1134 (D.C.1985).
In a small category of cases, claimants with occupational injuries may not be covered by the 1979 Act because of its stricter jurisdictional requirements. Since such a result would affect a worker’s substantive right to coverage under the 1928 Act to receive workers’ compensation in some form for injuries incurred while working in the District, the 1928 Act will apply unless the claim is covered under a state workers’ compensation statute.