Jaime Torres pled guilty in district court 2 tо conspiracy to distribute methamphetamine in violation of 21 U.S.C. §§ 841(a)(1) and 846. Torres appeals his sentence and the authority of the magistrate judge 3 to hear Torres’s guilty plea. We affirm.
I.
On September 22, 2000, Torres pled guilty in exchange for dismissal of two other counts оf the indictment. Pursuant to Torres’s consent, the magistrate judge conducted the plea colloquy pursuant to Federal Rule of Criminal Procedure 11. The plea was accepted by the district court on October 13, 2000, in accordance with the magistrate judge’s report and recommendation.
The district court conducted a sentencing hearing on December 16, 2000. Three of Torres’s co-conspirators testified at the hearing. Melanie Berliе testified that she had purchased methamphetamine from Torres and Cassandra Brunick testified that she had purchased methamphetamine indirectly from Torres through his former girlfriend, Brandy Goatley, who testified that she and Torres had engaged in repeated methampthetamine sales. In addition, Rita Hemmer, a police officer with the city of Grand Island, Nebraska, testified that a cooperating individual had purchased methamphetamine from Torres. Torres testified on his own behalf and admitted that he had sold methamphetamine, but disputed the quantities alleged by the other witnesses. The court determined that Torres was responsible for 5.85 kilograms of methamphetamine and determined his total offense level to be 33 and his criminal history category to be II. The court sentenced him at the low end of the guidelines range to a prison term of 151 months, followed by five years of supervised release, and imposed a $100 special assessment.
II.
On appeal, Torres argues that his sentence was excessive and that the magistrate judge did not have constitutional authority to conduct the plea proceedings. 4
A. Drug Quantity
Torres arguеs that the district court’s finding that he was responsible for 5.85 kilograms of methamphetamine was excessive and that we should therefore remand the case for resentencing. We review the district court’s calculation of drug quantity for clear error.
United States v. Williams,
*794
Torres contends that the court’s quantity finding was erroneous because, although it was supported by the testimony of witnesses at the sentencing hearing, it substantially exceeded the quantity that Torres admitted to selling. Tоrres does not contest that the district court’s determination was supported by the testimony of Berlie, Brunick, Goatley, and Hemmer; he simply asserts that the determination was erroneous because it does not comport with his testimony. Evaluations of witness credibility, however, are within the province of the district court.
United States v. Buford,
Torres also argues that the district court ran afoul of
Apprendi v. New Jersey,
Torres frames his argument thus: “Sentencing Torres to 151 months when he would have faced 0-20 years imprisonment and eligibility for probation under § 841(b)(1)(C) was plain error.”
Apprendi,
however, does not bar the imposition of a sentence unless it exceeds the statutory maximum for the offense of conviction.
Chavez,
B. Magistrate Judge’s Acceptance of the Plea
Torres contends that the District of Nebraska’s practice of allowing magistrate judges to conduct plea colloquies pursuant to a defendant’s consent violated his due process right to have an Article III judge preside over his case. Because this argument was not raised before the district court, we review the claim for plain error.
United States v. Olano,
Federal magistrate judges are not empowered to exercise judicial functions under Article III of the Constitution. Instead, their authority is that conferred by Congress under the Magistrates Act, 28 U.S.C. § 636. The Act enumerates certain duties, excepts others, and provides that a “magistrate may be assigned such additional duties as are nоt inconsistent with the Constitution and laws of the United States.” § 636(b)(3). The Supreme Court has held that “the carefully defined grant of authority to conduct trials of civil matters and of minor criminal cases should be construed as an implicit withholding of the authority to preside at a felony trial.”
Gomez v. United States,
*795
Although this is a matter of first impression in our circuit, the Second,
United States v. Williams,
In reaсhing their conclusions that magistrate judges may conduct plea hearings, our sister circuits have drawn on a pair of Supreme Court decisions addressing the authority of magistrate judges to conduct jury
voir dire
proceedings in felony cases.
Gomez
held that a magistrate judge may not, as an “additional duty” sanctioned by the Magistrates Act, conduct
voir dire
without the defendant’s consent, and
Peretz v. United States,
The Second Circuit applied the Peretz holding to its analysis of whether the Magistrates Act empowers magistrate judges to accept pleas:
In order for a Rule 11 allocution properly to fall within the sphere of “additional duties” authorized by Congress in the Magistrates Act, it must bear some relationship to those duties already assigned to magistrates by the Act. An allocution is an ordinary garden variety type of ministerial function that magistrate judges commonly perform on a regular basis.
Williams,
Even were a magistrate’s taking of a guilty plea to be viewed as an additional duty of greater importance than those duties specifically assigned to magistrates, the consent requirement ... saves the delegation. Cоnsent is the key. With the parties’ consent, a district judge may delegate to a magistrate judge the conduct of civil and misdemeanor trials. We think these duties comparable in responsibility and importance to administering a Rule 11 fеlony allocution.
Id.
at 633 (citing
Peretz,
Applying the
Peretz
requirement that “additional duties” bear some relationship to duties expressly assigned by the Magistrates Act, the Fifth Circuit in
Dees
held that because it had previously found “that evidentiary proceedings to determine the
*796
vоluntariness of a plea fall within the Act’s explicit assignment of duties,” and because a plea allocution is a “substantially similar” procedure, allocution is a permissible additional duty under § 636(b)(3).
Article Ill’s structural guarantees, however, encompass more than the interests of the individual defendant. Recognizing that a delegation of judicial authority to a magistrate judge may also violate Article Ill’s case and controversy clause “when a magistratе judge possesses final decision-making authority over a substantial issue in a case,” the Fifth Circuit further concluded that the taking of a plea was sufficiently reviewable that its delegation does not present a structural problem. Id. at 268.
We find that plea proceedings conducted by magistrate judges are sufficiently reviewable so as not to threaten Article Ill’s structural guarantees. The taking of a plea by a magistrate judge does not bind the district court tо accept that plea. Rather, the district court retains ultimate control over the plea proceedings, which are submitted to the court for its approval. Moreover, district courts review plea prоceedings on a de novo basis, contributing to the ministerial nature of the magistrate’s task.
Id. (citations omitted). Ultimately, the court rested its determination on the Per-etz decision: “If voir dire is a sufficiently reviewable procedure to permit its delegation to a magistrate judge, so too must be a plea proceeding.” Id.
We agree with the reasoning of the Second and Fifth Circuits. When Torres consented to have the magistrate judge hear his plea, he waived any personal right to have an Article III judge do so. After the magistrate judge conducted the plea colloquy, he submitted his report and recommendation to the district court and notified the parties of their right to file objections. The district court then conducted a de novo review of the magistrate judge’s recommendation before entering the conviction. This is precisely the procedure authorized by Williams and Dees. We conclude that the magistrate judge’s involvement did not violate Torres’s rights, exceed the grant of power conferred by the Magistrates Act, or violate the structural guarantees of Article III. The entry of the judgment of conviction on the plea was therefore proрer.
The judgment is affirmed.
Notes
. The Honorable Richard G. Kopf, Chief Judge, United States District Court for the District of Nebraska.
. The Honorable David Piester, United States Magistrate Judge for the District of Nebraska, hearing the plea by the consent of the parties under 28 U.S.C. § 636.
.Torres also contends that he has newly discovered evidence that Goatley committed perjury during the sentencing hearing. This claim has not been presented to the district court, and we will not consider it for the first time on аppeal. In any event, Goatley's perjury at sentencing, if it in fact occurred, would have no bearing on the validity of Torres’s conviction.
. The Seventh Circuit held similarly in an unpublished opinion,
United States v. Javens,
. Like Torres, the defendant in
Dees
had waived any non-structural constitutional claims by consenting to the delegation to the magistrate judge.
