MEMORANDUM OPINION
Denying The Defendants’ Motion To Dismiss
I. INTRODUCTION
This matter comes before the court on the defendants’ motion to dismiss. The plaintiff is a teacher who worked for the District of Columbia Public Schools (“DCPS”) before being dismissed from his employment pursuant to a reduction in force (“RIF”). He brings suit against the District of Columbia and the former DCPS Chancellor, Michelle Rhee (“defendant Rhee”),1 alleging age discrimination in violation of the Age Discrimination in Employment Act (“ADEA”), 29 U.S.C. §§ 631-34. The defendants move to dismiss the plaintiffs claims under Federal Rule of Civil Procedure 12(b)(6), asserting that such claims are barred for failure to exhaust administrative remedies, as well as by res judicata, collateral estoppel, and parallel litigation. For the reasons discussed below, the court denies the defendants’ motion.
II. Factual Allegations & Procedural Background 2
The plaintiff is a 53-year-old teacher who worked for DCPS for 28 years before being terminated in October of 2009 under a RIF, pursuant to the D.C. Municipal Regulations, 5-E DCMR §§ 1501, 1503. Compl. $ 4. The plaintiff claims that the defendants engaged in age discrimination and used the RIF as a pretext to remove 200 DCPS teachers — the vast majority of whom were over 40 years old-and replace them with younger teachers. Id. §§ 9-10. The defendants cited inadequate budgetary funds or poor performance when terminating the older teachers. Id. ¶ 10. In that vein, the plaintiff was subjected to the RIF after being adversely evaluated in a Competitive Level Documentation Form. Id. ¶ 7. Though he was an instrumental music teacher, his RIF competitive standing was governed by the standards for a vocal music teacher, a position that required a skill set different from his own. Id. §§ 7-8. As a result, the plaintiff was terminated. Id. §§ 5-7.
According to the plaintiff, former Chancellor Rhee “personally planned and directed the implementation of the RIF separations,” a “strategy” she chose after unsuccessful attempts to persuade the City Council to allow her to terminate DCPS employees without cause. Id. §§ 14-16. She then publicly commented that many of the RIF separations-an action justified on the basis of budget short- • falls-were necessary because the separat*130ed teachers had been low performers, and continued carrying out the separations even after the D.C. Council obtained funds to address the budget shortfalls. Id. §§ 19-20.
Further, under the D.C. Municipal Regulations, an agency must maintain a list of employees who were separated under a RIF for one year after their terminations. Id. ¶ 11. If a qualified person on the list is available for an opening within his or her discipline, that person must have priority in filling the position over a new appointment, transfer, or former employee who is not on the list. Id. ¶ 12. Through the fall of 2010, however, the defendants hired hundreds of new DCPS teachers and employees, “most of whom were much younger than the plaintiff and were just beginning their careers.” Id. ¶ 13. Because the plaintiff never received priority appointment before the “new, transferred, or non-listed teachers who were hired for positions of his type,” the defendants either failed to maintain the requisite reemployment priority list, did not include the plaintiff on it, or did not use the list. Id. §§ 14-16.
The plaintiff filed a complaint with the Equal Employment Opportunity Commission after he was terminated (“EEOC”). See Pl.’s Mot., Ex. A, at 1. In March of 2011, the EEOC issued him a right-to-sue letter, id., and he then filed an action in this court in June of 2011. The plaintiff alleges age-based discrimination in contravention of the ADEA. Id. §§ 23-24. In response, the defendants have filed a motion to dismiss the plaintiffs claims for failure to state a claim. The court now turns to the parties’ arguments and the applicable legal standards.3
III. ANALYSIS
A. Legal Standard for a Rule 12(b)(6) Motion to Dismiss
A motion to dismiss under Federal Rule of Civil Procedure 12(b)(6) tests the legal sufficiency of a complaint. Browning v. Clinton, 292 F.3d 235, 242 (D.C.Cir.2002). The motion does not test a plaintiffs ultimate likelihood of success on the merits, but rather, whether a plaintiff has properly stated a claim. Scheuer v. Rhodes, 416 U.S. 232, 236, 94 S.Ct. 1683, 40 L.Ed.2d 90 (1974). The complaint is only required to set forth a short and plain statement of the claim, in order to give the defendants fair notice of the claim and the grounds upon which it rests. Kingman Park Civic Ass’n v. Williams, 348 F.3d 1033, 1040 (D.C.Cir.2003) (citing Fed. R.Civ.P. 8(a)(2) and Conley v. Gibson, 355 U.S. 41, 47, 78 S.Ct. 99, 2 L.Ed.2d 80 (1957)).
A court considering this type of motion presumes the factual allegations of the complaint to be true and construes them liberally in the plaintiffs favor. See, e.g., United States v. Philip Morris, Inc., 116 F.Supp.2d 131, 135 (D.D.C.2000). It is not necessary for the plaintiff to plead all elements of his prima facie case in the complaint, Swierkiewicz v. Sorema N.A., 534 U.S. 506, 511-14, 122 S.Ct. 992, 152 L.Ed.2d 1 (2002), nor to plead law or match facts for every element of a legal theory, Krieger v. Fadely, 211 F.3d 134, 136 (D.C.Cir.2000) (internal citations omitted). Nonetheless, “[t]o survive a motion *131to dismiss, a complaint must contain sufficient factual matter, accepted as true, to state a claim to relief that is plausible on its face.” Ashcroft v. Iqbal, 556 U.S. 662, 678, 129 S.Ct. 1937, 173 L.Ed.2d 868 (2009) (internal quotation marks omitted); Bell Atl. Corp. v. Twombly, 550 U.S. 544, 562, 127 S.Ct. 1955, 167 L.Ed.2d 929 (2007). A claim is facially plausible when the pleaded factual content “allows the court to draw the reasonable inference that the defendant is liable for the misconduct alleged.” Iqbal, 556 U.S. at 678, 129 S.Ct. 1937 (citing Twombly, 550 U.S. at 556, 127 S.Ct. 1955). “The plausibility standard is not akin to a ‘probability requirement,’ but it asks for more than a sheer possibility that a defendant has acted unlawfully.” Id. (citing Twombly, 550 U.S. at 556, 127 S.Ct. 1955).
The court need not accept as true inferences unsupported by facts set out in the complaint or legal conclusions cast as factual allegations. Warren v. District of Columbia, 353 F.3d 36, 39 (D.C.Cir.2004); Browning, 292 F.3d at 242. “Threadbare recitals of the elements of a cause of action, supported by mere conclusory statements, do not suffice.” Iqbal, 556 U.S. at 678, 129 S.Ct. 1937 (citing Twombly, 550 U.S. at 555, 127 S.Ct. 1955).
B. Legal Standard for a Rule 56 Motion for Summary Judgment
Because the court will rely on documents outside of the pleadings, the defendants’ 12(b)(6) motion must be treated as a motion for summary judgment under Federal Rule of Civil Procedure 56. Colbert v. Potter, 471 F.3d 158, 164 (D.C.Cir.2006); Fed.R.Civ.P. 12(d). Summary judgment is appropriate when “there is no genuine dispute as to any material fact and the movant is entitled to judgment as a matter of law.” Fed.R.Civ.P. 56(a); see also Celotex Corp. v. Catrett, 477 U.S. 317, 322, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986); Diamond v. Atwood, 43 F.3d 1538, 1540 (D.C.Cir.1995). A “genuine dispute” is one whose resolution could establish an element of a claim or defense and, therefore, affect the outcome of the action. Celotex, 477 U.S. at 322, 106 S.Ct. 2548; Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 248, 106 S.Ct. 2505, 91 L.Ed.2d 202 (1986). To determine which facts are “material,” a court must look to the substantive law on which each claim rests. Anderson, 477 U.S. at 248, 106 S.Ct. 2505.
In ruling on a motion for summary judgment, the court must draw all justifiable inferences in the nonmoving party’s favor and accept the nonmoving party’s evidence as true. Id. at 255, 106 S.Ct. 2505. A nonmoving party, however, must establish more than “the mere existence of a scintilla of evidence” in support of its position. Id. at 252, 106 S.Ct. 2505. To prevail on a motion for summary judgment, the moving party must show that the nonmoving party “failfed] to make a showing sufficient to establish the existence of an element essential to that party’s case, and on which that party will bear the burden of proof at trial.” Celotex, 477 U.S. at 322, 106 S.Ct. 2548.
C. Exhaustion of Administrative Remedies
1. EEOC
The defendants contend that the plaintiff has failed to exhaust his administrative remedies because he did not timely file a complaint with the Equal Employment Opportunity Commission (“EEOC”). Defs.’ Mot. at 5. In response, the plaintiff has attached to his opposition a right-to-sue letter that he received from the EEOC. See Pl.’s Opp’n, Ex. A, at 1. In order to bring an ADEA action in court, a plaintiff must first file a charge of discrimi*132nation with the EEOC. Washington v. Wash. Metro. Area Transit Auth., 160 F.3d 750, 752 (D.C.Cir.1998). Upon receiving a right-to-sue letter from the EEOC, the plaintiff is allowed 90 days to file the ADEA action in court. 29 U.S.C. § 626(e). This period begins the day after the letter is received and expires on the 90th day thereafter. See FED. R. CIV. P. 6(a)(1); Abridge v. Gallaudet Univ., 729 F.Supp.2d 172, 178 (D.D.C.2010). Absent evidence indicating otherwise, courts generally assume that an EEOC right-to-sue letter was mailed on the date that it was issued. Baldwin Cnty. Welcome Ctr. v. Brown, 466 U.S. 147, 148, 104 S.Ct. 1723, 80 L.Ed.2d 196 (1984); Lucas-Bolden v. Potter, 2005 WL 3273725, at *3 (D.D.C. Sept. 29, 2005). If the delivery date is unknown, it is presumed that the letter was received 3 to 5 days after being mailed, which includes counting weekends and holidays. Ruiz v. Vilsack, 763 F.Supp.2d 168, 171 (D.D.C.2011); Abridge, 729 F.Supp.2d at 178. The 90-day period then commences, and if the 90th day falls on a weekend or holiday, the statutory period ends on the following business day. Fed.R.Civ.P. 6(a)(1).
In this case, the plaintiff has provided the EEOC’s right-to-sue letter, which states that it was issued on March 29, 2011. Pl.’s Opp’n, Ex. A, at 1. Because neither party indicates otherwise, it is assumed that the letter was mailed that same day. Further, because the plaintiff provides no evidence of the delivery date, the court will presume that the plaintiff received the letter 3 to 5 days later, or some time between April 1-3, 2011. Ninety days after April 3, 2011 is July 2, 2011. As July 2 was a Saturday, the plaintiff had until the following business day, Tuesday, July 5, 2011 to file an action.4 Because the plaintiff filed his complaint on June 29, 2011, he exhausted his administrative remedies and his claims are considered timely.5
2. D.C. Municipal Regulations and the CMPA
The defendants also argue that the plaintiff has failed to exhaust his administrative remedies under the D.C. Municipal Regulations. Defs.’ Mot. at 6. The statutory sections that the defendants cite, however, describe the procedure by which an agency must maintain an employee reemployment priority list in the event of a RIF, not how a separated employee must satisfy certain measures before filing suit in court. 6-B DCMR §§ 2427.1, 2427.4, 2427.6, 2428.1. The defendants further state that under the D.C.Code, an employee “may appeal ... a reduction in force” with the Office of Employee Appeals (“OEA”), but it puts forward nothing indicating that this type of appeal is required. See D.C.Code §§ 1-606.03, 1-624.04. In-*133deed, while an employee grievance must typically be appealed to the OEA pursuant to the Comprehensive Merit Personnel Act, “that particular statutory remedy does not foreclose” a plaintiff from bringing claims arising under the laws of the United States, as this court has original jurisdiction over such claims. Matthews v. District of Columbia, 675 F.Supp.2d 180, 185 (D.D.C.2009); see also Savage v. District of Columbia, 2004 U.S. Dist. LEXIS 4422, *11-12 (D.D.C. Mar. 19, 2004); Crockett v. D.C. Metro. Police Dep’t, 293 F.Supp.2d 63, 67 (D.D.C.2003). The plaintiff here was thus not required to exhaust any administrative remedies with the OEA before bringing federal statutory claims in this court.6
D. Res Judicata and Parallel Litigation
The defendants contend that because the plaintiff filed an action in the Superior Court of the District of Columbia (“Superior Court”) alleging claims arising out of the same set of facts as does the instant complaint, his claims in this court are barred by res judicata, collateral estoppel, and parallel litigation. Defs.’ Mot. at 8. “The doctrine of res judicata prevents repetitious litigation involving the same causes of action or the same issues.” I.A.M. Nat’l Pension Fund v. Indus. Gear Mfg. Co., 723 F.2d 944, 946 (D.C.Cir.1983). Res judicata has two distinct aspects— claim preclusion and issue preclusion (commonly known as collateral estoppel) — that apply in different circumstances and with different consequences to the litigants. NextWave Pers. Commc’ns, Inc. v. Fed. Commc’ns Comm’n, 254 F.3d 130, 142 (D.C.Cir.2001); Novak v. World Bank, 703 F.2d 1305, 1309 (D.C.Cir.1983).
Under claim preclusion, “a final judgment on the merits of an action precludes the parties or their privies from relitigating issues that were or could have been raised in that action.” Drake v. Fed. Aviation Admin., 291 F.3d 59, 66 (D.C.Cir.2002) (quoting Allen v. McCurry, 449 U.S. 90, 94, 101 S.Ct. 411, 66 L.Ed.2d 308 (1980)). Here, the plaintiff filed an action in the Superior Court in November of 2010, before he filed suit in this court in June of 2011. Defs.’ Mot., Ex. A, at 1. In the Superior Court case, the plaintiff outlined essentially the same facts as he has in the instant complaint, and alleged several common law and other claims. Id. at 3-4. Although he amended his Superior Court complaint on two separate occasions, he ultimately filed a praecipe for voluntary dismissal without prejudice in June of 2012. Praecipe, Brewer v. Rhee et al., No. 2010-CA-008565-B (D.C.Super. Ct. June 20, 2012), No. 2; see Weil v. Markowitz, 829 F.2d 166, 173 n. 15 (D.C.Cir.1987) (“We are free to take judicial notice of [a] related proceeding in another court.”).7
*134A final judgment requires that a court decide an issue of fact or law necessary to its judgment. Bode & Grenier, LLP v. Knight, 2010 WL 908934, at *5 (D.D.C. Mar. 10, 2010). If the prior action has been dismissed without prejudice, there has been no final judgment on the merits, and a plaintiff will not be precluded by the doctrine of res judicata from having his claims heard on the merits in a separate court. Dozier v. Ford Motor Co., 702 F.2d 1189, 1194 (D.C.Cir.1983); McAlister v. Potter, 843 F.Supp.2d 117, 121 (D.D.C.2012). Thus, because the prior Superior Court action was dismissed without prejudice, there was no final judgment on the merits, and the plaintiffs ADEA claims in this court are not barred by claim preclusion. See Ponder v. Chase Home Finance, LLC, 865 F.Supp.2d 13, 16-18, 2012 WL 1931237, at *2-3 (D.D.C. May 23, 2012) (holding that dismissal without prejudice of a prior case arising from the same set of facts was not a final judgment, and that the plaintiffs claims where thus not barred by res judicata); Knight, 2010 WL 908934, at *5 (determining that res judicata did not apply to the instant action because there was no evidence of a final judgment on the merits from the prior action).
Similarly, under collateral estoppel, or issue preclusion, “once a court has decided an issue of fact or law necessary to its judgment, that decision may preclude relitigation of the issue in a suit on a different cause of action involving a party to the first case.” Yamaha Corp. of Am. v. United States, 961 F.2d 245, 254 (D.C.Cir.1992) (quoting Allen, 449 U.S. at 94, 101 S.Ct. 411). Thus, as collateral estoppel “prevents the relitigation of any issue that was raised and decided in a prior action,” Novak, 703 F.2d at 1309, the plaintiffs claims here are not barred because the prior action was dismissed without prejudice and consequently no issues of fact or law had been decided. See Ponder, 865 F.Supp.2d at 16-18, 2012 WL 1931237, at *2-3 (holding that the plaintiffs claims were not barred by issue preclusion because the prior action had been dismissed without prejudice).8
Finally, the defendant argues that the plaintiffs claims should be dismissed under a theory of parallel litigation because he has a separate cause of action in the Superior Court. Defs.’ Mot. at 8. “District courts have the discretion to ... dismiss a pending suit when parallel litigation that is factually related is ongoing in another forum.” Holland v. ACL Transp. Serv., LLC, 815 F.Supp.2d 46, 55 (D.D.C.2011). Essentially, courts should “avoid duplicative litigation.” Id. (internal citation omitted). When the defendant filed the instant motion in this matter, the plaintiffs action in the Superior Court was still pending, but in the months since, that case has been voluntarily dismissed. Thus, because there is no longer an ongoing related action in another jurisdiction, there is no parallel litigation, and therefore, no basis for the court to dismiss this *135matter. See id. (determining that because the related case in a separate jurisdiction was no longer “ongoing” after it was transferred and consolidated with the initial case, the plaintiff’s claims were not barred by parallel litigation).
IV. CONCLUSION
For the foregoing reasons, the court denies the defendants’ motion to dismiss. An order consistent with this Memorandum Opinion is issued this 20th day of September, 2012.