OPINION AND ORDER DENYING DEFENDANT’S MOTION FOR SUMMARY JUDGMENT
WILLIAMS, Judge.
Plaintiff Judith A. Mansfield, a female employee at the Library of Congress (LOC), alleges that the LOC violated the Equal Pay Act by paying male employees higher wages for doing substantially the same work under similar circumstances. Specifically, Plaintiff claims that she was paid less than four male employees — her supervisor when she was temporarily promoted to his position, two coworkers in the same position and a co-worker she supervised. Additionally, Plaintiff claims that the LOC violated the Equal Pay Act by failing to follow the recommendation of a classification consultant to upgrade her position. Plaintiff seeks back pay, benefits and a retroactive promotion.
This matter comes before the Court on Defendant’s motion for summary judgment.1 Defendant argues that any pay disparity between Plaintiffs pay and that of her male supervisor and co-workers was the result of legitimate business reasons or factors other than gender. Because the record on summary judgment does not establish that Defendant’s articulated reasons justified the pay disparity and because there are genuine issues of material fact regarding the reasons for the disparity, Defendant’s motion is denied.2
Factual Background
3
Plaintiff has been employed by the LOC since July 1, 1969, and has served as the Chief of the Arts and Sciences Cataloging Division (ASCD) since May 1988. Compl. ¶¶ 1, 5, 6; Pl.’s App. at 36, 40. Prior to this, Plaintiff served as an Automated Operations [689]*689Coordinator in Library Services, pay grade GS-13, Step 10, where she worked under the supervision of the Director of Cataloging, Mr. Beacher Wiggins. Compl. ¶ 6; Wiggins Decl. ¶ 6, Def.’s App. at 7, 8. Plaintiff was selected for her current position, Chief of ASCD, pay grade GS-15, by Mr. Wiggins in 1998. Compl. ¶ 6; Wiggins Decl. ¶ 6, Def.’s App. at 8.
At that time, there were eight divisions under Mr. Wiggins’ supervision: Regional and Cooperative Cataloging (senior level pay grade),4 Cataloging Policy and Support (senior level pay grade), Social Sciences Cataloging, History and Literature Cataloging, Arts and Sciences Cataloging, Special Materials Cataloging, Cataloging in Publication, and Decimal Classification. Pl.’s App. at 120. The Chief of each division reported directly to Mr. Wiggins. Id.
Plaintiff’s Tenure As Acting Director for Cataloging: September 2002 — June 2004
In September 2002, then Associate Librarian for Library Services, Winston Tabb, retired. Def.’s App. at 8, Wiggins Deck ¶4. Mr. Tabb was Mr. Wiggins’ direct supervisor. Id. Until Mr. Tabb’s replacement was appointed in August 2003, the LOC detailed Mr. Wiggins to the position of Acting Associate Librarian for Library Services. While Mr. Wiggins was detailed, he assigned Plaintiff to his former position as Acting Director for Cataloging. Id. ¶¶ 5, 7. Plaintiff served in this position from September 2002 until June 2004 and was paid at the Senior Level (SL) pay grade for two nonconsecutive periods of 120 days, from September 2002-Janu-ary 2003, and February-May 2004. Wiggins Deck ¶¶ 7-10, Def.’s App. at 9-10.5 At all other times Plaintiff served in this position, she was paid at the GS-15 level. Id.
Mr. Wiggins explained Plaintiffs temporary promotion as follows:
I ... temporarily promoted [Plaintiff] to the SL pay grade because as Acting Director she would be performing the full range of duties of the position, which is an SL position. Temporary promotions are customary for any detail of a manager or staff member to a higher-graded position.
Under Library of Congress regulations, a staff member may only be temporarily promoted for up to 120 days during any twelve-month period. Temporary promotions to the SL pay grade in excess of 120 days are restricted to those situations where a permanent candidate for the position is being sought and the position is being posted. Therefore, since the position of Director for Cataloging was not being filled, Ms. Mansfield’s temporary promotion could not exceed 120 days.
Wiggins Deck ¶7-8, Def.’s App. at 9. Mr. Wiggins continued to assign Plaintiff the duties of Acting Director after her first 120-day promotion because he “wanted continuity of a single manager leading the directorate and ... had been very pleased with her work during her first 120 days as Acting Director.” Wiggins Deck ¶ 9, Def.’s App. at 10. He stated:
Ms. Mansfield’s gender had nothing to do with my decision to keep her assigned to the duties of Acting Director nor did it have anything to do with the amount of pay she received while assigned to these duties. Moreover, ... she could have declined to continue as Acting Director when the temporary promotion ended. Howev[690]*690er, based on Ms. Mansfield’s explicit agreement in continuing to perform the duties of Acting Director and my desire to have her continue, I allowed her to do so.
Id.
During Plaintiffs tenure as Acting Director for Cataloging, Plaintiff was the immediate supervisor of a male employee — John Byrum, Chief of the Regional and Cooperative Cataloging Division, who was paid at the Senior Level. Wiggins Decl. ¶ 16, Def.’s App. at 13. In June 2004, Plaintiff returned to performing the duties of Chief of ASCD. Id. ¶ 10.
Mr. Wiggins’ Prior Temporary Promotion to Acting Director for Cataloging
In 1995, prior to his permanent appointment as the Director for Cataloging, Mr. Wiggins also was temporarily promoted to Acting Director for Cataloging. From January 1995 to June 1997, he served as Acting Director for Cataloging and was temporarily promoted for three 120-day periods, and paid at the SL grade. Other than during these periods, he was paid his regular GS-15 pay. Wiggins Decl. ¶ 3, Def.’s App. at 7-8. Mr. Wiggins received his first temporary promotion on January 16, 1995, his second temporary promotion on November 12, 1995, and his third temporary promotion on November 10, 1996. Pl.’s App. at 64-68. The LOC posted a vacancy announcement for the Director for Cataloging position on September 17, 1996. Def.’s Reply, App. at 48. Mr. Wiggins’ third temporary promotion was extended on March 10, 1997, until June 8, 1997, when he received his permanent promotion. Pl.’s App. at 158, 64.
The Recommendation to Reclassify the Chief Positions to Senior Level Status in August 2003
Prior to his appointment as Acting Associate Librarian, Mr. Wiggins requested that HRS review the position descriptions for the eight Chief positions in Cataloging because he “had long thought that the Chief positions in Cataloging merited being classified at the SL grade and at the time, three6 of the Chiefs were already at the SL grade and the remaining five positions, including Ms. Mansfield’s position, were at the GS-15 pay grade.” Wiggins Decl. ¶ 11, Def.’s App. at 11. Therefore, in April 2003, HRS hired a classification consultant to review the Chief positions. Id.
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OPINION AND ORDER DENYING DEFENDANT’S MOTION FOR SUMMARY JUDGMENT
WILLIAMS, Judge.
Plaintiff Judith A. Mansfield, a female employee at the Library of Congress (LOC), alleges that the LOC violated the Equal Pay Act by paying male employees higher wages for doing substantially the same work under similar circumstances. Specifically, Plaintiff claims that she was paid less than four male employees — her supervisor when she was temporarily promoted to his position, two coworkers in the same position and a co-worker she supervised. Additionally, Plaintiff claims that the LOC violated the Equal Pay Act by failing to follow the recommendation of a classification consultant to upgrade her position. Plaintiff seeks back pay, benefits and a retroactive promotion.
This matter comes before the Court on Defendant’s motion for summary judgment.1 Defendant argues that any pay disparity between Plaintiffs pay and that of her male supervisor and co-workers was the result of legitimate business reasons or factors other than gender. Because the record on summary judgment does not establish that Defendant’s articulated reasons justified the pay disparity and because there are genuine issues of material fact regarding the reasons for the disparity, Defendant’s motion is denied.2
Factual Background
3
Plaintiff has been employed by the LOC since July 1, 1969, and has served as the Chief of the Arts and Sciences Cataloging Division (ASCD) since May 1988. Compl. ¶¶ 1, 5, 6; Pl.’s App. at 36, 40. Prior to this, Plaintiff served as an Automated Operations [689]*689Coordinator in Library Services, pay grade GS-13, Step 10, where she worked under the supervision of the Director of Cataloging, Mr. Beacher Wiggins. Compl. ¶ 6; Wiggins Decl. ¶ 6, Def.’s App. at 7, 8. Plaintiff was selected for her current position, Chief of ASCD, pay grade GS-15, by Mr. Wiggins in 1998. Compl. ¶ 6; Wiggins Decl. ¶ 6, Def.’s App. at 8.
At that time, there were eight divisions under Mr. Wiggins’ supervision: Regional and Cooperative Cataloging (senior level pay grade),4 Cataloging Policy and Support (senior level pay grade), Social Sciences Cataloging, History and Literature Cataloging, Arts and Sciences Cataloging, Special Materials Cataloging, Cataloging in Publication, and Decimal Classification. Pl.’s App. at 120. The Chief of each division reported directly to Mr. Wiggins. Id.
Plaintiff’s Tenure As Acting Director for Cataloging: September 2002 — June 2004
In September 2002, then Associate Librarian for Library Services, Winston Tabb, retired. Def.’s App. at 8, Wiggins Deck ¶4. Mr. Tabb was Mr. Wiggins’ direct supervisor. Id. Until Mr. Tabb’s replacement was appointed in August 2003, the LOC detailed Mr. Wiggins to the position of Acting Associate Librarian for Library Services. While Mr. Wiggins was detailed, he assigned Plaintiff to his former position as Acting Director for Cataloging. Id. ¶¶ 5, 7. Plaintiff served in this position from September 2002 until June 2004 and was paid at the Senior Level (SL) pay grade for two nonconsecutive periods of 120 days, from September 2002-Janu-ary 2003, and February-May 2004. Wiggins Deck ¶¶ 7-10, Def.’s App. at 9-10.5 At all other times Plaintiff served in this position, she was paid at the GS-15 level. Id.
Mr. Wiggins explained Plaintiffs temporary promotion as follows:
I ... temporarily promoted [Plaintiff] to the SL pay grade because as Acting Director she would be performing the full range of duties of the position, which is an SL position. Temporary promotions are customary for any detail of a manager or staff member to a higher-graded position.
Under Library of Congress regulations, a staff member may only be temporarily promoted for up to 120 days during any twelve-month period. Temporary promotions to the SL pay grade in excess of 120 days are restricted to those situations where a permanent candidate for the position is being sought and the position is being posted. Therefore, since the position of Director for Cataloging was not being filled, Ms. Mansfield’s temporary promotion could not exceed 120 days.
Wiggins Deck ¶7-8, Def.’s App. at 9. Mr. Wiggins continued to assign Plaintiff the duties of Acting Director after her first 120-day promotion because he “wanted continuity of a single manager leading the directorate and ... had been very pleased with her work during her first 120 days as Acting Director.” Wiggins Deck ¶ 9, Def.’s App. at 10. He stated:
Ms. Mansfield’s gender had nothing to do with my decision to keep her assigned to the duties of Acting Director nor did it have anything to do with the amount of pay she received while assigned to these duties. Moreover, ... she could have declined to continue as Acting Director when the temporary promotion ended. Howev[690]*690er, based on Ms. Mansfield’s explicit agreement in continuing to perform the duties of Acting Director and my desire to have her continue, I allowed her to do so.
Id.
During Plaintiffs tenure as Acting Director for Cataloging, Plaintiff was the immediate supervisor of a male employee — John Byrum, Chief of the Regional and Cooperative Cataloging Division, who was paid at the Senior Level. Wiggins Decl. ¶ 16, Def.’s App. at 13. In June 2004, Plaintiff returned to performing the duties of Chief of ASCD. Id. ¶ 10.
Mr. Wiggins’ Prior Temporary Promotion to Acting Director for Cataloging
In 1995, prior to his permanent appointment as the Director for Cataloging, Mr. Wiggins also was temporarily promoted to Acting Director for Cataloging. From January 1995 to June 1997, he served as Acting Director for Cataloging and was temporarily promoted for three 120-day periods, and paid at the SL grade. Other than during these periods, he was paid his regular GS-15 pay. Wiggins Decl. ¶ 3, Def.’s App. at 7-8. Mr. Wiggins received his first temporary promotion on January 16, 1995, his second temporary promotion on November 12, 1995, and his third temporary promotion on November 10, 1996. Pl.’s App. at 64-68. The LOC posted a vacancy announcement for the Director for Cataloging position on September 17, 1996. Def.’s Reply, App. at 48. Mr. Wiggins’ third temporary promotion was extended on March 10, 1997, until June 8, 1997, when he received his permanent promotion. Pl.’s App. at 158, 64.
The Recommendation to Reclassify the Chief Positions to Senior Level Status in August 2003
Prior to his appointment as Acting Associate Librarian, Mr. Wiggins requested that HRS review the position descriptions for the eight Chief positions in Cataloging because he “had long thought that the Chief positions in Cataloging merited being classified at the SL grade and at the time, three6 of the Chiefs were already at the SL grade and the remaining five positions, including Ms. Mansfield’s position, were at the GS-15 pay grade.” Wiggins Decl. ¶ 11, Def.’s App. at 11. Therefore, in April 2003, HRS hired a classification consultant to review the Chief positions. Id. The consultant recommended that four of the GS-15 Chief positions, Plaintiffs position, ASCD, as well as Chief of the History and Literature Cataloging Division, Social Sciences Cataloging Division and Special Materials Cataloging Division, be upgraded to SL pay grade positions. Id.7 The consultant explained:
[The four positions recommended for reclassification to SL] manage divisions with substantial resources, i.e., diverse functional responsibilities, a multi-million dollar budget, and large staffs. This diversity requires exceptional administrative skill to coordinate and integrate the various functions and resolve broad internal management issues, e.g., managing change, internal restructuring of functions, automation, cost reduction, and initiating, changing, or discontinuing ongoing projects. Those positions are recommended for consideration for elevation to senior level.
Pl.’s App. at 28. The classification consultant explained that the remaining two Division Chief positions “differed] significantly from the [others] in terms of scope and complexity of functions managed,” and therefore, did not recommend them for elevation to SL. Id.
In August 2003, the Director of HRS submitted the classifier’s recommendation for [691]*691the position upgrades to the newly appointed Associate Librarian for Library Services, Deanna Marcum, for her consideration. Ms. Marcum believed that the Library Services’ budget could not support the additional SL positions and therefore did not approve the recommended upgrades. Wiggins Decl. ¶ 12, Def.’s App. at 11. As a result, HRS never reclassified or upgraded the four Cataloging Chief positions. Id.
Plaintiff’s Tenure as Assistant Director For Bibliographic Access: August 2004— March 2005
On July 15, 2004, Mr. Wiggins sent an email to the Division Chiefs regarding potential new Assistant Director positions, stating in pertinent part:
Directors are to let Deanna know by next week their views on the assistant director positions. Deanna’s preference is that the assistant director serve in [that] capacity with collateral duties. She sees the duties of the assist directors as primarily a coordinating function. Directors are to let her know if we disagree and what the rationale is for having the position be full time. I responded in the meeting that I want the assist director for acq and the assist for cat to be full time positions. I’ve taken on collateral duties in the past — to do so is draining.
Pl.’s App. at 154. Mr. Wiggins advocated that the assistant director positions be full-time. Id. On August 4, 2004, Mr. Wiggins informed the Division Chiefs via e-mail that the assistant director positions would not be full-time stating in pertinent part:
Deanna has determined that she cannot agree to any assistant director positions being full time.... Deanna stated that after experimenting with assistant directors in collateral roles for a while, we can later reevaluate its effectiveness. It is not clear if the concept of director/deputy director will come to be, later in fy05.
Pl.’s App. at 126.
On August 6, 2004, Ms. Marcum announced the appointments of Beacher Wiggins as Acting Director for Acquisitions, Plaintiff as Assistant Director for Bibliographic Access, Steve Herman as Assistant Director for Collections Management and Mark Dimunation as Assistant Director for Special Collections and Services. Pl.’s Opp. App. at 34, 119; Wiggins Decl. ¶ 14, Def.’s App. at 12. Ms. Marcum stated that she was “grateful to each of these assistant directors for taking on additional responsibilities.” Id.
While serving as Assistant Director for Bibliographic Access, Plaintiff, who was paid at the GS-15 level, earned less than other Assistant Directors, Messrs. Herman and Dimunation. She also served as the immediate supervisor of a Senior Level male employee — John Byrum, Chief of the Regional and Cooperative Cataloging Division, who was paid at the SL grade and earned more.8 Wiggins Decl. ¶ 16, Def.’s App. at 13.
By letter dated March 15, 2005, Plaintiff advised the Librarian of Congress that she had been paid less than her male counterparts in violation of the EPA and Title VII and requested “to negotiate a satisfactory resolution.” Pl.’s App. at 156.9
Less than a month later, on April 13, 2005, Ms. Marcum sent a memorandum to the LOC’s Directors and Division Chiefs explaining that she had eliminated the three Assistant Director positions, which had been created eight months earlier. Pl.’s App. at 121. The memorandum stated:
When we realigned Library Services last July, I mentioned that the organizational structure would be adjusted as needed. We were trying something new and we would adjust as experience required. At my suggestion, the directors of Acquisitions and Bibliographic Access and Collections and Services named three division chiefs to take on collateral duties as assistant directors, but these positions have not worked out as intended, so I have eliminated the three coordinating positions. I [692]*692have asked the directors of the two largest units to look anew at the organizational structure that best fits the directorate’s needs. The result is likely to be that more high-level staff will be asked to take on collateral duties. We will continue to monitor the workloads of the directorates and make structural changes as needed.
Pl.’s App. at 121.
Discussion
Jurisdiction
The Tucker Act, 28 U.S.C. § 1491(a)(1), both confers jurisdiction upon the United States Court of Federal Claims and waives sovereign immunity with respect to certain actions for monetary relief brought against the United States. See United States v. Mitchell, 463 U.S. 206, 212-18, 103 S.Ct. 2961, 77 L.Ed.2d 680 (1983); Fisher v. United States, 402 F.3d 1167, 1172 (Fed.Cir.2005). Under the Tucker Act, sovereign immunity is waived for “any claim against the United States founded either upon the Constitution, or any Act of Congress or any regulation of an executive department, or upon any express or implied contract with the United States, or for liquidated or unliquidated damages in cases not sounding in tort.” 29 U.S.C. § 1491(a)(1) (2000).
The United States Court of Federal Claims “has jurisdiction over suits founded on the Equal Pay Act, 29 U.S.C. § 206, under the Tucker Act....” Harbuck v. United States, 58 Fed.Cl. 266, 267-68 (2003), aff'd, 378 F.3d 1324, 1330 (Fed.Cir.2004), cert. denied, 543 U.S. 1153, 125 S.Ct. 1386, 161 L.Ed.2d 118 (2005) (finding jurisdiction over Equal Pay Act claim but dismissing because the same claim was filed simultaneously in federal district court and was barred by 28 U.S.C. § 1500); Barnes v. Levitt, 118 F.3d 404, 410 (5th Cir.1997), cert. denied, 523 U.S. 1136, 118 S.Ct. 1839, 140 L.Ed.2d 1090 (1998) (District Court lacked jurisdiction over employee’s Equal Pay Act claims against United States under the Tucker Act, because claims exceeded jurisdictional limits, thereby requiring action to be brought in Court of Federal Claims).10
Summary Judgment In Equal Pay Act Cases
The Equal Pay Act (EPA) was enacted in 1963 as an amendment to the Fair Labor Standards Act (FLSA) and was extended to apply to the Federal Government in 1974. 29 U.S.C. §§ 201, 203(e)(2). The Equal Pay Act provides;
Prohibition of sex discrimination
(1) No employer having employees subject to any provisions of this section shall discriminate, within any establishment in which such employees are employed, between employees on the basis of sex by paying wages to employees in such establishment at a rate less than the rate at which he pays wages to employees of the opposite sex in such establishment for equal work on jobs the performance of which requires equal skill, effort, and responsibility, and which are performed under similar working conditions, except where such payment is made pursuant to (i) a seniority system; (ii) a merit system; (iii) a system which measures earnings by quantity or quality of production; or (iv) a differential based on any other factor other than sex: Provided, That an employer who is paying a wage rate differential in violation of this subsection shall not, in order to comply with the provisions of this subsection, reduce the wage rate of any employee.
29 U.S.C. § 206(d) (2005).
To establish a prima facie ease under the Equal Pay Act, a plaintiff must demonstrate that “an employer pays different wages to employees of opposite sexes ‘for equal work on jobs the performance of which requires equal skill, effort, and responsibility, and which are performed under similar working conditions.’” Corning Glass Works v. [693]*693Brennan, 417 U.S. 188, 195, 94 S.Ct. 2223, 41 L.Ed.2d 1 (1974); see Lissak v. United States, 49 Fed.Cl. 281, 284 (2001); Raymond v. United States, 31 Fed.Cl. 514, 518 (1994); Molden v. United States, 11 Cl.Ct. 604, 610 (1987). Once the plaintiff establishes a prima facie case, the burden shifts to the defendant to show that the differential is justified under one of the Act’s four exceptions: (1) a seniority system; (2) a merit system; (3) a system which measures earnings by quantity or quality of production; or (4) a differential based upon any factor other than sex.11 29 U.S.C. § 206(d)(1). As a general rule, the application of an exemption is an affirmative defense on which the employer has the burden of proof. Corning Glass Works, 417 U.S. at 196, 94 S.Ct. 2223; County of Wash. v. Gunther, 452 U.S. 161, 170, 101 S.Ct. 2242, 68 L.Ed.2d 751 (1981).
The employer’s burden to establish an affirmative defense under the EPA is a heavy one. See, e.g., Hauschild v. United States, 53 Fed.Cl. 134, 139 (2002) (citing Ellison v. United States, 25 Cl.Ct. 481, 487 (1992) (“Merely asserting a plausible, non-gender based explanation is not sufficient.”)). As the Third Circuit recognized in Stanziale v. Jargowsky, “[bjecause the employer bears the burden of proof at trial, in order to prevail at the summary judgment stage, the employer must prove at least one affirmative defense ‘so clearly that no rational [fact-finder] could find to the contrary.’” 200 F.3d 101, 107 (3d Cir.2000) (citing EEOC v. Del. Dep’t of Health & Soc. Servs., 865 F.2d 1408, 1414 (3d Cir.1989)).
To successfully demonstrate that the pay differential is justified under one of the four exemptions, an employer must prove that the gender-neutral factor it identified is actually the factor causing the wage differential in question. Stanziale, 200 F.3d at 107-08. A plaintiff may “counter the employer’s affirmative defense by producing evidence that the reasons the defendant seeks to advance are actually a pretext for sex discrimination.” See Aldrich v. Randolph Cent. Sch. Dist., 963 F.2d 520, 526 (2d Cir.1992) (“The appropriate inquiry to determine if the factor put forward is a pretext, is whether the employer has use[d] the factor reasonably in light of the employer’s stated purpose as well as its other practices.”) (citations omitted). If the factor is a mere pretext used by an employer who intended to discriminate on the basis of gender, then the affirmative defense fails. See Kouba v. Allstate Ins. Co., 691 F.2d 873, 876-77 (9th Cir.1982).
As in any summary judgment context, the Court may neither make credibility determinations nor weigh the evidence and seek to determine the truth of the matter. Id. Further, summary judgment is inappropriate if the factual record is insufficient to allow the Court to determine the salient legal issues. E.g., Statesman II Apts. v. United States, 66 Fed.Cl. 608, 624 (2005) (denying summary judgment because record was insufficient for Court to construe term “material differences”); H.N. Wood Prods., Inc. v. United States, 59 Fed.Cl. 479, 486 (2003) (“[T]he better course is to proceed to trial because the Court lacks a sufficient factual record to [694]*694determine whether or not the Forest Service’s suspension of H.N. Wood’s Contract violated the implied duty to cooperate and not hinder or was otherwise per se unreasonable.”).
Plaintiff’s Temporary Promotion To Her Supervisor’s Position: September 2002— June 2004
Plaintiff claims that Defendant violated the EPA by failing to pay her Senior Level pay throughout her tenure as Acting Director for Cataloging because she was performing the same duties as her male predecessor, who was paid at the Senior Level. Plaintiff served as the Acting Director for Cataloging from September 2002 until June 2004 but was only promoted to the SL pay grade for two 120-day periods during this time. Defendant contends that Plaintiffs temporary promotions to Senior Level had to be limited to 120 days per year due to gender-neutral Library regulations — not because of any gender bias. Def.’s Mot. at 16. Two regulations are implicated. First, LCR 2017-2.1, § 13, governing the Senior Executive System, provides:
The Librarian or designee may temporarily promote employees from other pay plans into Senior Level Executive positions for a period not-to-exceed 120 days provided they meet the position’s minimum qualification requirements. Temporary promotions beyond 120 days are restricted to those instances when a permanent candidate is being sought through a competitive announcement. Such temporary promotions may not exceed nine months unless preceded by a temporary promotion in which case the total amount of time spent in a temporary promotion cannot exceed one year. If a temporary promotion is to exceed four months, the position must be posted.12
Second, the LOC regulation governing details provides that a “staff member may not be detailed to perform the work of a higher grade position or of a position at the same grade with known promotion potential for more than 120 days.” LCR 2010-15 § 4(A), PL’s App. at 152-53. It appears that Defendant did not follow either regulation with respect to Plaintiff or Mr. Wiggins in that both performed the work of SL positions for more than 120 days when a permanent candidate for the SL position was not being solicited.13 As such, Defendant has not established on this record that its purported compliance with its regulations is a factor justifying Plaintiffs disparate pay.
In addition, a genuine issue of fact exists as to whether Plaintiff should have received SL pay for a temporary promotion from September 2002 until June 2004, while she was Acting Director for Cataloging because she supervised a SL employee. Plaintiff was paid at the SL grade for only two 120-day periods even though she supervised a SL male employee, Mr. Byrum, for her entire tenure in this job. Defendant argues that the pay differential was warranted because Mr. Byrum was already being paid SL pay when Plaintiff became his supervisor. However, the record does not contain sufficient evidence showing why the LOC paid a male subordinate more than Plaintiff, his female supervisor, for at least one year and one month.14 Cf. Kouba, 691 F.2d at 876-77 [695]*695(“[A]n employer might assert some business reason as a pretext for a discriminatory objective,” such as “prior salary,” which can “easily be used to capitalize on the unfairly low salaries historically paid to women.”).
The Library’s Decision Not To Reclassify the Chief of Arts & Sciences Cataloyiny Division Position to Senior Level
Plaintiff claims that the LOC violated the EPA by failing to reclassify her position as Chief of the Arts & Sciences Division to the Senior Level to put her on par with a male employee who was performing the same duties. Plaintiff claims that once the classification consultant recommended that Plaintiffs position and three other Cataloging Chief positions be upgraded from GS-15 to Senior Level positions, the Library should have either increased her compensation to the Senior Level or reduced her duties to GS-15 work. Defendant argues that Associate Librarian Marcum’s decision not to follow the recommendations of the classification consultant was premised on budgetary and restructuring issues, not on Plaintiff’s gender. Marcum Decl. ¶¶ 7-8, Def.’s App. at 3-4.
The record does not indicate the process for the reclassification of positions at the LOC or whether the classification consultant’s recommendation was correct or warranted implementation.15 Genuine issues of material fact exist as to whether Plaintiff’s position — Chief of ASCD — involved Senior Level work as the classifier recommended and should have been reclassified. If it should have been reclassified, there is an additional question of fact as to whether the Library’s budget could sustain the creation of additional Senior Level positions.16
The Library’s Creation of Three Assistant Director Positions
In August 2004, the Library created three new Assistant Director positions, which it filled with Plaintiff and two male co-workers. Plaintiff argues that Defendant violated the EPA by paying Plaintiff less than the male Assistant Directors for performing the same work. Defendant argues that any disparity in pay between Plaintiff and the males was based on the fact that both of the males held Senior Level positions prior to taking on the Assistant Director responsibilities, not on Plaintiff’s gender. This raises the same issues as the LOC’s paying Plaintiff less than a male she supervised, ie., whether the prior salary of the males was a legitimate basis to differentiate Plaintiffs pay.
Defendant further argues that the Assistant Director duties were collateral duties which did not require a position upgrade. Plaintiff maintains that her duties as Assistant Director were not collateral to her duties as Chief of ASCD, but instead, consumed the majority of her work day. The record does not sufficiently indicate what the Assistant Director duties were or what percentage of time was devoted to these duties. As such, summary judgment is not appropriate.17
Conclusion
1. Defendant’s Motion for Summary Judgment is DENIED.
[696]*6962.The Court will convene a telephonic status conference to discuss further proceedings in this action on July 13, 2006 at 11:00 a.m. EST. The Court will initiate the teleconference.