
111 S.W.3d 328 (2003)
Antonio AGUIRRE, et al., and Chevron U.S.A., Inc., et al., Appellants,
v.
PHILLIPS PROPERTIES, INC., Appellee.
No. 13-00-426-CV.
Court of Appeals of Texas, Corpus Christi-Edinburg.
August 7, 2003.
*330 Alberto Luis Guerrero, J. Scott McLain, Roger Reed, Reed, Carrera & McLain, J. W. Dyer, Sharon Almaguer, Dyer & Associates, Reynaldo Ortiz, McAllen, Alex E. Cosculluela, Adams & Reese, L.L.P., Chester J. Makowski, Ruth A. Silvers, Royston, Rayzor, Vickery & Williams, L.L.P., Jeffrey S. Davis, Kevin L. Colbert, Gardere Wynne Swell & Riggs, L.L.P., Larkin C. Eakin, Winstead, Sechrest & Minick, Houston, David G. Oliveira, Roerig, Oliveria & Fisher, Gilberto Hinojosa, J.A. Magallanes, Magallanes, Hinojosa & Mancias, Keith N. Uhles, Royston, Rayzor, Vickery & Williams, Brownsville, Richard G. Roth, Law Office of Richard Roth, Edinburg, William R. Towns, Royston, Rayzor, Vickery & Williams, San Antonio, for appellants.
Dan Miller, Austin, Francisco J. Enriquez, Enriquez & Cantu, Francisco J. Rodriguez, Rodriguez, Tovar & Garcia, McAllen, Frank E. Weathered, Dunn & Weathered, Corpus Christi, Ramon Rosales, Jr., Law Office of Ramon Rosales, Jr., Mission, Rolando Cantu, Edinburg, for appellees.
Before the court en banc.[1]

OPINION ON MOTION FOR REHEARING
Opinion by Chief Justice VALDEZ.
Appellant Antonio Aguirre[2] filed a motion for rehearing en banc, arguing that *331 this Court made a dispositive error of fact concerning the proceedings in the trial court, in our disposition of issue one. Upon review of the record, we grant Aguirre's motion for rehearing, withdraw our prior opinion, and substitute the following opinion.

Facts and Procedural History
This appeal arises from five separate lawsuits[3] filed by numerous plaintiffs against a voluminous number of defendants, involving allegations of contamination resulting from leakage from fuel storage tanks. Four of these five cases were consolidated. Only cause number C-4565-95-A was not consolidated; the plaintiffs in that case were Antonio G. Aguirre, Miriam M. Aguirre, and Chevron.[4] One of the defendants was Phillips Properties, Inc.,[5] the appellee. Phillips Properties moved for summary judgment in both the consolidated cases and in cause number C-4565-95-A, and said motions were granted.
The subject of this appeal is the summary judgment granted in favor of Phillips Properties. This summary judgment was signed by the trial court on April 6, 2000, and dismissed all claims against Phillips Properties in each of the cases in which Phillips Properties was a defendant. Furthermore, it severed the dismissed claims into a separate case, which was assigned cause number C-4565-95-A-1. Thereafter, on May 4, 2000, Aguirre filed a motion for new trial in cause number C-4565-95-A-1, seeking to set aside the summary judgment in favor of Phillips Properties on the grounds that Aguirre did not receive notice of the submission date. On May 8, 2000, Aguirre filed responses to Diamond Shamrock's and Mobil Oil's motions for summary judgment which were still pending in cause numbers C-4597-92-E, C-4566-95-B, C-4568-95-D, and C-4570-95-F.
On June 19, 2000, the trial court denied Aguirre's motion for new trial, stating that it had considered Aguirre's response to the motion for summary judgment as timely filed.

Analysis
Appellants' sole issue in the motion for rehearing argues that this Court was "misled to make a dispositive error of fact about the proceedings in the trial court." *332 Appellants argue that this Court mistakenly held that any error in failing to provide notice of the summary judgment was cured when the plaintiffs/appellants late filed a response. They assert that this is error because "there was never any such response."
A trial court must give notice of the submission date for a motion for summary judgment, because this date determines the date the nonmovant's response is due. Martin v. Martin, Martin & Richards, Inc., 989 S.W.2d 357, 359 (Tex.1998); Carpenter v. Cimarron Hydrocarbons Corp., 98 S.W.3d 682, 684-85 (Tex.2002). The failure to give notice of the submission date for a motion for summary judgment constitutes error; but, such error is rendered harmless when the trial court considers the nonmovant's response and reconfirms its ruling. Martin, 989 S.W.2d at 359. Rule 166a of the Texas Rules of Civil Procedure requires that a party serve notice of a summary judgment hearing on opposing counsel at least twenty-one days before the hearing date. TEX.R. CIV. P. 166a(c); Mosser v. Plano Three Venture, 893 S.W.2d 8, 11 (Tex.App.-Dallas 1994, no writ). Rule 21a of the Texas Rules of Civil Procedure provides:
Service by mail shall be complete upon deposit of the paper, enclosed in a postpaid, properly addressed wrapper, in a post office or official depository under the care and custody of the United States Postal Service.... A certificate by a party or an attorney of record, or the return of an officer, or the affidavit of any person showing service of a notice shall be prima facie evidence of the fact of service. Nothing herein shall preclude any party from offering proof that the notice or instrument was not received....
TEX.R. CIV. P. 21a. Under rule 21a, if notice of the hearing is properly addressed and mailed, postage prepaid, a presumption arises that the notice was properly received by the addressee. Cliff v. Huggins, 724 S.W.2d 778, 780 (Tex.1987); Mosser, 893 S.W.2d at 11. The certificate of service of the party or attorney is the basis for the presumption. Cliff, 724 S.W.2d at 780. The presumption may be rebutted by an offer of proof of nonreceipt. Id.
In this case, Phillips Properties filed two motions for summary judgment, one entitled "Defendant Phillip's[sic] Properties, Inc. Motion for Summary Judgment as to all Plaintiffs," and another entitled "Defendant Phillip's[sic] Properties, Inc. Motion for Summary Judgment (No Evidence) as to Plaintiff Antonio Aguirre." The motion for summary judgment as to all plaintiffs did not contain a certificate of service. The rule 21a certificate of service accompanying the motion for summary judgment (no evidence) as to plaintiff Antonio Aguirre stated:
A true and correct copy of the above and foregoing has been served on January, 2000, to the following: Law Office of Reynaldo Ortiz, 801 Nolana, Suite 202, McAllen, Texas 78504[;] Law Office of Richard G. Roth, 134 East Price Road, Brownsville, Texas 78520[;] CORCORAN & MCLAIN, L.L.P., 100 South Bicentennial, McAllen, Texas 78501.
Immediately preceding the certificate of service was the motion for summary judgment (no evidence) as to plaintiff Antonio Aguirre, and a proposed final summary judgment. Although the certificate indicates the motion itself and the proposed order granting the motion were served on counsel for Aguirre, it does not indicate Aguirre was ever notified of the date and time of the hearing. The motions for summary judgment are likewise silent with respect to a date and time for the hearing. Aguirre asserts that appellants never received notice of the hearing scheduled on *333 Phillips Properties' summary judgment motions.
At a minimum, notice of a summary judgment hearing under rule 21a requires that (1) the opposing party be advised that the motion has in fact been set for hearing, and (2) the date and time of the hearing be included in the fiat. See TEX.R. CIV. P. 21a; TEX.R. CIV. P. 166a. Because the record does not contain a certificate of service stating that Phillips Properties mailed notice of the scheduled hearing to Aguirre, we conclude there is no presumption of notice in the present case. Because there is nothing in the record to otherwise show that Aguirre received notice of the hearing, we find that Aguirre did not receive actual or constructive notice of the summary judgment hearing.
The dissent concedes that "the January 26 order setting submission date does not include a certificate of service ..." It argues however, that "the docket sheet reflects that copies of the order mailed to all parties on January 27, 2000."
In the present case, what the docket sheet reflects are two identical but separate entries, one dated January 27, 2000, and the other February 2, 2000, which state "copies mailed to all parties." The docket entries do not specify what was mailed. Even if we were to assume that the docket entries refer to the orders setting hearing on the motions for summary judgment, we do not consider the docket entries a part of the record.
A docket entry forms no part of the record which may be considered; it is a memorandum made for the trial court and clerk's convenience. Energo Int'l Corp. v. Modern Indus. Heating, Inc., 722 S.W.2d 149, 151 & 151 n. 2 (Tex.App.-Dallas 1986, no writ); Azopardi v. Hollebeke, 428 S.W.2d 167, 168 (Tex.Civ.App.-Waco 1968, no writ); Restelle v. Williford, 364 S.W.2d 444, 445 (Tex.Civ.App.-Beaumont 1963, writ ref'd n.r.e.). Consequently, there is no indication in the record that appellants received notice of the hearing on the motions for summary judgment.
Phillips Properties argues that the supreme court has apparently relaxed the absolute prohibition against the use of docket entries in some limited, although apparently undefined, circumstances. "A docket entry may supply facts in certain situations, but it cannot be used to contradict or prevail over a final judicial order." N-S-W Corp. v. Snell, 561 S.W.2d 798, 799 (Tex.1977, orig.proceeding) (citations omitted). However, N-S-W Corp. did not overrule cases holding that a docket entry forms no part of the record that may be considered but is merely a memorandum made for the trial court and clerk's convenience. First Nat'l Bank v. Birnbaum, 826 S.W.2d 189, 191 (Tex.App.-Austin 1992, no writ). Docket entries remain inherently unreliable because they lack the formality of orders and judgments. Energo, 722 S.W.2d at 151 n. 2.
As for waiver, the dissent relies on Smith v. Mike Carlson Motor Co., 918 S.W.2d 669, 672 (Tex.App.-Fort Worth 1996, no writ), to argue that appellants waived this issue because of their failure to file a sworn motion for new trial. However, the dissent misreads the holding in Smith. The Smith court held that a party must file a motion for new trial to bring to the trial court's attention that his failure to respond to a summary judgment was based on a lack of notice. Id. Such a motion also preserves the complaint for appellate review. Tex.R.App. P. 33.1; Smith, 918 S.W.2d at 672. The court then went on to hold that because the record included a certificate of service, a presumption of valid service was created. Smith, 918 S.W.2d at 672. With no facts in the record to support his allegations of *334 lack of notice, the court held that Smith failed to overcome the presumption of valid service. Id. at 673. In the present case, we have no presumption of valid service of the hearing notice, nor does the record contain any evidence that appellants received notice of the hearing. Because Aguirre's motion for new trial brought this issue to the trial court's attention, and because this issue may be resolved by an examination of the record in this case, we find Aguirre's motion for new trial sufficient to preserve this issue for appellate review. Tex.R.App. P. 33.1(a). Furthermore, because there is nothing in the record to otherwise show that Aguirre received notice of the hearing, we find that Aguirre did not receive actual or constructive notice of the summary judgment hearing.
Moreover, even if we were to assume Aguirre did receive notice of the summary judgment hearing, the record indicates two stay orders were entered by the trial court on January 26, 2000, and February 28, 2000. The February stay order stated that all pending motions pertaining to the Northern Plume parties were ordered deferred and not set for hearing until after conclusion of the Southern Plume trial.[6] We hold that said orders serve to negate any notice of the summary judgment submission date that Aguirre might have received.
Phillips Properties argues that even if there had been a lack of notice, as Aguirre alleges, by considering the response to the motion for summary judgment and reconfirming its ruling, the trial court rendered any such error harmless. Martin, 989 S.W.2d at 359.
In Martin, the Texas Supreme Court held that the district court erred in granting the defendant's motion for summary judgment without notice. The court concluded however, that the "error was harmless... because the court fully considered Gary's [petitioner] response and reconfirmed its ruling." Martin, 989 S.W.2d at 359. The court further noted that the district court's actions did not prevent the petitioner from "presenting to the court a full response to defendant's motion for summary judgment." Id.
Appellant's argument fails to recognize, however, that the record reflects no response to Phillips Properties' motions for summary judgment was ever filed by Aguirre. The record further reflects that the trial court was never presented with any response to Phillips Properties' motions for summary judgment. Aguirre did not file a response to the motions for summary judgment which were granted in favor of Phillips Properties. The only responses filed by Aguirre specifically note that they were made in response to the motions for summary judgment of Diamond Shamrock and Mobil Oil; however, no mention is made of the motions for summary judgment filed by Phillips Properties. More importantly, said response was never filed in cause number C-4565-95-A-1, the only cause in which Phillips Properties was still a party after the trial court's severance order of April 6, 2000. As such, the trial court could not have considered any response by Aguirre in denying appellant's motion for new trial. Therefore, the trial court had no opportunity to consider any response in reconfirming its ruling and erred in failing to provide a party with the requisite 21-day *335 notice of a setting on a motion for summary judgment.
In the present case, the failure to provide notice prevented Aguirre from presenting any response to defendant's motion for summary judgment. Accordingly, this Court holds the error was not rendered harmless. We therefore sustain appellant Aguirre's issue one. Because of our disposition in issue one we need not address Aguirre's remaining issues. TEX.R.APP. P. 47.1.

Chevron
As for appellant Chevron, we dismiss its issues on appeal due to lack of standing. Standing is a component of subject matter jurisdiction and cannot be waived. Texas Ass'n of Bus. v. Texas Air Control Bd., 852 S.W.2d 440, 445-46 (Tex.1993). As a general rule of Texas law, to have standing a plaintiff must demonstrate an interest in a conflict distinct from that of the general public, such that the defendant's actions have caused the plaintiff some particular injury. See Hunt v. Bass, 664 S.W.2d 323, 324 (Tex.1984). A party must show that its interest has been prejudiced before it has standing to appeal. Gorman v. Gorman, 966 S.W.2d 858, 864 (Tex.App.-Houston [1st Dist.] 1998, pet. denied). Appellant bears the burden of making a prima facie showing of prejudice. Id. An appealing party may not complain of errors that do not affect its rights. Buckholts Indep. Sch. Dist. v. Glaser, 632 S.W.2d 146, 150 (Tex.1982).
Chevron failed to demonstrate that its interests were prejudiced by the granting of the summary judgment. At the time summary judgment was granted, Chevron and the appellee had no cross-claims filed against each other. As a result, Chevron is not liable as a result of the summary judgment. Accordingly, we hold Chevron has no standing to challenge the judgment in favor of Phillips Properties. See Gorman, 966 S.W.2d at 865-66 (no standing found for appealing defendant because summary judgment granted did not assign liability to appealing defendant). Because Chevron lacks standing to appeal the summary judgment, we do not address the issues raised in its brief.
We therefore reverse the trial court's order granting summary judgment as to appellant Aguirre and remand this cause for further proceedings. As to appellant Chevron, we dismiss its issues on appeal.
Concurring and Dissenting opinion by Justice YAÑEZ joined by Justice HINOJOSA.
Concurring opinion by Justice CASTILLO.
Concurring and dissenting by Justice YAÑEZ joined by Justice HINOJOSA.
In our original opinion in this case, a panel of this Court affirmed a "default" summary judgment granted in favor of appellee, Phillips Properties, Inc. See Aguirre v. Phillips Props., Inc., No. 13-00-426-CV, 2001 WL 961337, 2001 Tex.App. LEXIS 5812 (Tex.App.-Corpus Christi August 23, 2001, no pet. h.) (designated for publication). Appellants, Antonio Aguirre and numerous others, plaintiffs below, filed a motion for rehearing and motion for rehearing en banc, contending, in a single issue, that this Court made a dispositive error of fact in holding that the trial court cured any error caused by lack of notice to appellants of the submission date for Phillips's motion by considering appellants' untimely response to Phillips's motion as if the response had been timely filed. See id., at *6. Appellants contend our holding was in error because appellants did not file any response to Phillips's motion and the "response" relied on by Phillips and the trial *336 court was not, in fact, a response to Phillips's motion and was not even filed in the case in which Phillips was a party. The majority grants appellants' motion for rehearing en banc and holds that appellants' unsworn motion for new trial was sufficient to preserve their challenge to the summary judgment on grounds of "no notice."
We concur with the majority's holding that Chevron lacks standing to challenge the judgment in favor of Phillips. We dissent, however, because we disagree with the majority's holding that appellants' unsworn motion for new trial was sufficient to preserve their challenge to the summary judgment on grounds of "no notice." We would hold that: (1) by failing to file a sworn motion for new trial, appellants waived any right to challenge the summary judgment on grounds of no notice; and (2) the trial court did not abuse its discretion in granting Phillips's no-evidence summary judgment motion because an adequate time for discovery had passed.

Background
Because the issues in this appeal are intertwined with the complex and confusing procedural history of the underlying cases, it is important to lay out the procedural background in some detail. Initially, numerous plaintiffs filed five separate lawsuits against numerous defendants, including Phillips, alleging negligence resulting in the underground contamination of their property. The cause numbers of the five suits are C-4565-95-A ("Aguirre"), C-4566-95-B, C-4597-92-E, C-4570-95-F, and C-4568-95-D ("the four other suits").
Phillips filed three motions for summary judgment pertaining to appellants' claims. The first, a no-evidence motion for summary judgment "as to Plaintiff Antonio Aguirre," was filed on January 20, 2000, under all five cause numbers. Although captioned "as to Plaintiff Antonio Aguirre," the motion refers to plaintiffs' "sixth amended petition" and states that Phillips "moves for summary judgment against plaintiff, ANTONIO AGUIRRE, ET AL," arguing in various paragraphs that "plaintiff's" [sic] and "plaintiffs" "have not provided any evidence" of appellants' causes of action. Accordingly, the January 20 motion pertains to all plaintiffs' claims against Phillips in each of the cases in which it was filed. The motion, which refers to particular paragraph numbers in the "plaintiff's [sic] sixth amended petition," contends there is no evidence of any of the elements of the causes of action alleged by appellants: negligence, negligence per se, negligence and the doctrine of res ipsa loquitor, public and private nuisance, trespass and continuing trespass, and gross negligence. More specifically, in the "Arguments and Authorities" section, Phillips argues that the no-evidence standard requires only adequate time for discovery and that plaintiffs failed to develop expert opinion evidence concerning the measure or extent of their damages by the court-ordered deadline of August 1, 1999. The motion includes a certificate of service.
The record includes a January 26, 2000 "Order Setting Submission Date" in cause number C-4570-95-F, in which "Defendant's Motion for Summary Judgment (No Evidence) as to Plaintiff Aguirre" is set for submission on February 24, 2000, with a "response date" of February 17, 2000. Although the January 26 order setting submission date does not include a certificate of service, the docket sheet reflects that copies of the order were mailed to all parties on January 27, 2000.
On January 20, 2000, the same day Phillips filed its no-evidence motion in all five causes, appellants filed in cause numbers C-4566-95-B, C-4597-92-E, C-4570-95-F, *337 and C-4568-95-D (not in Aguirre) a "Motion to Reset Hearings on Various Defendants' Motions," in which they specifically requested that hearings on motions filed by other defendants (not Phillips) and "a hearing on any other motion which may be filed by any other Northern Plume defendant" be reset until sometime after the Southern Plume trial set to commence on February 7, 2000. On January 26, 2000[1] (the same day the trial court signed the order setting hearing on Phillips's no-evidence motion as to Aguirre), the trial court granted appellants' motion to reset hearings and (1) reset motions filed by other defendants until March 3, 2000; (2) reset Phillips's earlier-filed January 12 motion to dismiss or abate in the four cause numbers until March 3, 2000; and (3) ordered that "all other motions filed by defendants who are not proceeding to trial on February 7, 2000, shall not be set for hearing until after the conclusion of the trial set for February 7, 2000." The order did not specifically reference Phillips's pending no-evidence summary judgment motion as to plaintiff Aguirre.
Two days later, on January 28, 2000, in Aguirre only (not under the other four cause numbers), Phillips filed an "Amended Motion for Summary Judgment (No Evidence) as to Plaintiff Antonio Aguirre."[2] The motion, which refers to the "Plaintiff's Original Petition," states that it "supercedes" the previously filed January 20 motion. See TEX.R. CIV. P. 65. Like the January 20 motion, the January 28 motion contends there is no evidence as to any of the elements of the plaintiffs' claims for negligence, negligence per se, negligence and the doctrine of res ipsa loquitor, public and private nuisance, trespass, and gross negligence. Also, as in the January 20 motion, Phillips argues it is entitled to judgment because adequate time for discovery has passed and plaintiffs failed to develop expert opinion evidence concerning the measure or extent of their damages by the court-ordered deadline of August 1, 1999. In the January 28 motion, Phillips specifically argues that the plaintiffs' negligence claims fail because plaintiffs have produced no expert designations regarding the standard of care Phillips owed to the plaintiffs or the breach of that standard of care. Like the January 20 motion, the January 28 motion contained a certificate of service.
On the same day, an "Order Setting Submission Date" was filed under the other four cause numbers (not Aguirre), setting submission for "Defendant's Amended Motion for Summary Judgment as to all Plaintiffs [sic] Claims"[3] for February 29, 2000, with a response date of February 22, 2000. Although the January 28, 2000 order setting a submission date does not contain a certificate of service, the docket sheet reflects that the order was mailed to all parties on February 2, 2000.
A few days later, on February 1, 2000, Phillips filed a no-evidence summary judgment motion "as to all Plaintiffs [sic] Claims" in cause numbers C-4566-95-B, *338 C-4568-95-D, C-4597-95-E,[4] and C-4570-95-F. The motion refers to the specific paragraphs of "Plaintiffs' Consolidated Seventh Amended Petition." With regard to the plaintiffs' negligence claims, Phillips specifically argues that the plaintiffs' expert designations contain no testimony regarding the standard of care owed by Phillips or breach of that standard of care. Regarding the trespass claims, Phillips argues plaintiffs have no evidence Phillips caused or permitted a physical entry of contaminants onto the plaintiffs' property. With regard to the plaintiffs' public- and private-nuisance claims, Phillips contends plaintiffs have no evidence that its conduct proximately caused actual or threatened injury, that it created the alleged nuisance, or that it caused physical harm to the plaintiffs' property. The record does not include a certificate of service with the February 1 motion.
On February 4, 2000, the trial court signed an order consolidating the four cases, C-4597-92-E, C-4568-95-D, C-4566-95-B, and C-4570-95-F, and then severed the one consolidated case into two cases: (1) the "Northern Plume" case, designated as C-4597-92-E; and (2) the "Southern Plume" case, designated as C-4597-92-E-1.[5]
Shortly thereafter, on February 7, 2000, the Southern Plume trial began. A few days later, on February 11, 2000, the Southern plume trial ended in a mistrial. The trial began again on February 23, 2000.
On February 28, 2000, under all four cause numbers, including the now consolidated and severed Northern Plume case (cause number C-4597-92-E), appellants filed a "Motion for Further Extension of Time and to Stay Discovery," in which appellants reminded the court that by its January 26, 2000 order, it had reset certain motions until March 3, 2000 and ordered hearings in all other motions filed by Northern Plume defendants deferred until after the conclusion of the Southern Plume trial. The motion complained that certain Northern Plume defendants had filed motions and set them for hearing on March 1, 2000. It further complained that certain Northern Plume defendants had served notices for deposition during the Southern Plume trial. The motion requested that "all motions pertaining to the Northern Plume be deferred until the conclusion of the Southern Plume trial and that, similarly, all discovery pertaining to the Northern Plume be stayed pending the conclusion of the Southern plume trial." On the same day, February 28, under the four cause numbers (including the severed Northen Plume cause number C-4597-92-E), the trial court granted appellants' motion for extension of time and to stay discovery. The court ordered that "all pending motions pertaining to the Northern Plume parties or issues as well as all such motions which may hereafter be filed shall be deferred and shall not be set for hearing until after the conclusion of the Southern Plume trial which is ongoing at this time." The court further ordered all discovery regarding the Northern Plume stayed until after the conclusion of the Southern Plume trial.
*339 On March 8, 2000, shortly after granting the stay, the trial court held a hearing at Chevron's request in all five cause numbers to clarify the court's February 28, 2000 order. At the hearing, the parties discussed the status of discovery in the Northern Plume case, the scheduling of the Northern Plume trial, and the issue of whether discovery should continue during the pendency of the Southern Plume trial. At the conclusion of the hearing, the trial court denied the request to vacate its February 28 order staying discovery.
On April 6, 2000, in Aguirre (C-4565-95-A) and in cause numbers C-4566-95-B, C-4568-95-D, C-4570-95-F, and C-4597-95-E,[6] the trial court granted Phillips's summary judgment against "all of the above plaintiffs" in "all of the above cases" and severed those claims into cause number C-4565-95-A-1.
On May 4, 2000, appellants filed an unsworn motion for new trial under the severed Phillips cause number C-4565-95-A-1, as well as under cause numbers C-4597-92-E (severed Northern Plume case), C-4568-95-D, C-4566-95-B, and C-4570-95-F, in which they argued that: (1) the trial court ordered all pending motions regarding the Northern Plume deferred and not set for hearing until after the conclusion of the Southern Plume trial; (2) they did not receive the required twenty-one days notice of the hearing on Phillips's motion for summary judgment; (3) summary judgment was granted in Phillips's favor during a period in which the court had expressly deferred all hearings; (4) appellants did not file a response to Phillips's motion in reliance on the trial court's order deferring action on the motion until the conclusion of the Southern Plume trial; and (5) discovery was still ongoing.
On May 8, 2000, appellants filed responses to various defendants' motions for summary judgment and moved the court for a continuance with regard to the motions for summary judgment under cause numbers C-4597-92-E (Northern Plume case), C-4566-95-B, C-4568-95-D, and C-4570-95-F. The response specifically identified no-evidence motions for summary judgment filed by defendants Diamond Shamrock and Mobil Oil set for hearing on May 16, 2000. The response further argued that the no-evidence motions for summary judgment should not be granted on the grounds that the motions were premature because discovery had not been completed.
On May 10, 2000, Chevron attempted to intervene in the lawsuit by filing a motion for rehearing and to set aside the trial court's April 6, 2000 order.
On June 16, 2000, the trial court held a hearing on appellants' motion for new trial and to set aside the summary judgment granted in Phillips's favor. At the hearing, appellants argued that: (1) they relied on the trial court's stay orders of January 26, 2000 and February 28, 2000 in not filing a response because they believed the orders stayed all proceedings in the Northern Plume case during the pendency of the Southern Plume trial; and (2) the trial court erred in prematurely granting Phillips's no-evidence summary judgment motion because discovery was still incomplete. In response, Phillips argued that: (1) because the cases had been on file for over eight years, there had been an adequate time for discovery; (2) appellants' January 20, 2000 motion to reset hearings specifically listed the motions which they requested to be reset, and Phillips's summary judgment motion was not identified or included in the motion; and (3) any *340 "stay" granted by the trial court in its January 26, 2000 order ended when the Southern Plume trial ended in mistrial on February 11, 2000; and thus, appellants were required to file a response to Phillips's motion when the Southern Plume trial ended. At the hearing, appellants' counsel noted that Phillips's summary judgment motion had been filed in January. Appellants did not argue or represent to the trial court that they were deprived of any notice regarding Phillips's motion.[7]
On June 19, 2000, the trial court denied appellants' motion for new trial. The order states that the court "has fully considered, as if it had been timely filed in the above entitled and numbered cause, the Plaintiffs' Responses to Motions for Summary Judgment and Motion for Continuance with Regard to Defendants' Motions for Summary Judgment." The court's order further finds there has been adequate time for discovery and reaffirms its April 6, 2000 summary judgment in Phillips's favor.
In three issues, appellants contend the trial court erred in granting summary judgment because: (1) they had no notice of a hearing or submission date and moreover, they relied on the trial court's January 26, 2000 and February 28, 2000 orders staying all hearings and discovery; (2) discovery was incomplete; and (3) Phillips is barred by the doctrine of quasi estoppel from arguing there is no evidence it contributed to the contamination because, in previously arguing to the trial court that it lacked jurisdiction, Phillips admitted that contamination leaked from underground storage tanks located on its property.

Standard of Review Applicable to Default Summary Judgment
After our original opinion issued and during the pendency of appellants' motion for rehearing, the Texas Supreme Court addressed the issue of whether the Craddock standard[8] applies to a motion for new trial filed after a default summary judgment. See Carpenter v. Cimarron Hydrocarbons Corp., 98 S.W.3d 682, 683-84 (Tex.2002). In Cimarron, the defendant failed to timely respond to a motion for summary judgment, but discovered its failure to respond two days before the summary judgment hearing. Id. at 684. The defendant filed a proposed response the day of the hearing, along with a motion for leave to file a late response and a motion for continuance. Id. at 685. The trial court denied both motions and granted summary judgment in favor of the defendants. Id. *341 The defendant also filed a motion for new trial, which the trial court denied. Id.
On appeal, the Fort Worth Court of Appeals applied the Craddock standard and reversed the summary judgment. Cimarron Hydrocarbons Corp. v. Carpenter, 35 S.W.3d 692, 696 (Tex.App.-Fort Worth 2000), rev'd, 98 S.W.3d at 683-84. The Texas Supreme Court reversed, holding that the Craddock rule:
does not apply to a motion for new trial filed after judgment has been granted on a summary-judgment motion to which the nonmovant failed to timely respond when the movant [for new trial] had an opportunity to seek a continuance or obtain permission to file a late response.
Cimarron, 98 S.W.3d at 686.
Thereafter, this Court invited rebriefing and resubmitted the case for oral argument in light of the supreme court's holding in Cimarron. Appellants contend that Phillips's motion for summary judgment was "not even set for submission when it [was] granted by default," and that Cimarron suggests that the Craddock standard is therefore inapplicable. Phillips contends appellants had actual notice of submission because the record reflects that notice of submission was mailed to "all parties" on a timely basis and appellants failed to preserve their "no notice" claim by failing to present any sworn proof of lack of notice. Phillips thus argues, because appellants had actual notice, that the holding in Cimarron requires appellants to have availed themselves of the pre-submission remedies provided by the rules of procedure, such as moving for continuance or seeking leave to file a late response. See id. Because appellants failed to do so, Phillips argues, they have waived any right to complain that the trial court abused its discretion in denying their motion for new trial.
Because we would hold that appellants failed to preserve any challenge to the summary judgment on "no-notice" grounds, it is unnecessary for us to apply Cimarron to the facts in this case.

Waiver
Phillips argues appellants waived their challenge to summary judgment on grounds of "no notice" by failing to file a sworn motion for new trial, supported by affidavit or other sworn proof, stating that the failure to respond was due to lack of notice. In support of its position, Phillips cites Smith v. Mike Carlson Motor Co., 918 S.W.2d 669, 672 (Tex.App.-Fort Worth 1996, no writ), in which the Fort Worth court of appeals held that without appropriate affidavits, a motion for new trial based on lack of adequate notice of a summary judgment hearing is fatally defective. See id.
In Smith, the defaulting party (Smith) filed a motion for new trial, asserting that he did not receive notice of either the movant's motion for summary judgment or hearing date. See id. at 671. The Fort Worth court recognized that generally, a party does not need to file a motion for new trial to preserve a complaint on the grounds for which summary judgment has been granted. See id. at 672 (citing TEX.R. CIV. P. 324). However, the court noted, because Smith was not challenging the summary judgment on substantive grounds, that rule 324 was not dispositive. Id. The court held that because Smith failed to attach an affidavit to his motion for new trial verifying that he had no notice of the hearing, his claim of "no notice" was "a mere assertion," and his motion for new trial was defective. See id.; see also Law Offices of Windle Turley v. French, ___ S.W.3d ___, ___, 2003 WL 253643, at *3, 2003 Tex.App. LEXIS 1258, at *8 (Tex.App.-Fort Worth Feb. 6, *342 2003, no pet. h.) (complaint of no notice of summary judgment hearing may be preserved by post-judgment motion, but complaint must be supported by evidence); Rios v. Texas Bank, 948 S.W.2d 30, 33 n. 4 (Tex.App.-Houston [14th Dist.] 1997, no writ) (noting that a party complaining of no notice of a summary judgment hearing in a motion for new trial must present evidence to support the assertion); Welborn-Hosler v. Hosler, 870 S.W.2d 323, 328 (Tex.App.-Houston [14th Dist.] 1994, no writ) (burden of affirmatively showing lack of notice not met by merely claiming lack of notice in a motion for new trial, unsupported by affidavit or other competent evidence).
In responding to Smith's argument that the record showed he "could not have received notice" of the motion and hearing,[9] the court noted that the motion for summary judgment had a certificate of service, which created a presumption of valid service. See Smith, 918 S.W.2d at 672. In the case before us, although the record does not include a certificate of service for Phillips's February 1, 2000 motion for summary judgment, both the January 20 motion and the January 28 amended motion contained certificates of service. Moreover, the emphasis in Smith is on the defaulting party's need to verify to the trial court, by affidavit or other evidence, that he did not receive notice: "Generally, where a new trial is sought because of facts outside the knowledge of the trial court, the factual allegations in the motion should be supported by affidavit unless good reasons for the nonproduction of affidavits is shown." Id. (quoting Abercia v. First Nat'l Bank of San Antonio, 500 S.W.2d 573, 576 (Tex.Civ.App.-San Antonio 1973, no writ)). Thus, we find Smith applicable to the present case, and would hold, as in Smith, that without affidavits or other sworn evidence, appellants' claims they received no notice[10] are "mere assertion[s]," and that appellants' motion for new trial is therefore defective. See id.
The majority contends that we "misread" the holding in Smith, and suggests it is distinguishable from the present case. The majority asserts, without explanation or citation to supporting authority, that in the present case, appellants' motion for new trial "brought this issue to the trial court's attention" and was thus "sufficient to preserve this issue for appellate review." In Smith, however, Smith's motion for new trial, without an affidavit verifying that he had no notice, was "defective" and rendered his claims of no notice as "mere assertions." See id. Moreover, the majority makes no attempt to discuss or distinguish the cases cited above, which hold that a party complaining of no notice must affirmatively show lack of notice by a motion for new trial supported by affidavit *343 or other competent evidence. See French, at *3, 2003 Tex.App. LEXIS 1258, at *8; Rios, 948 S.W.2d at 33 n. 4; Welborn-Hosler, 870 S.W.2d at 328.
The majority acknowledges that in order to be entitled to reversal of the summary judgment, appellants must show how they were harmed by the absence of notice. See Martin v. Martin, Martin & Richards, Inc., 989 S.W.2d 357, 359 (Tex.1998). However, the majority simply asserts that "no response to Phillips Properties' motions for summary judgment was ever filed by Aguirre" and concludes, without explanation or authority, that therefore, "the error was not rendered harmless." As noted above, at the June 16, 2000 hearing on appellants' motion for new trial, appellants argued that: (1) they relied on the trial court's stay orders of January 26, 2000 and February 28, 2000 in not filing a response because they believed the orders stayed all proceedings in the Northern Plume case during the pendency of the Southern Plume trial; and (2) the trial court erred in prematurely granting Phillips's no-evidence summary judgment motion because discovery was still incomplete. These arguments were therefore considered and rejected by the trial court. The majority fails to identify any arguments appellants would have presented in a response had they not been prevented from doing so by the alleged lack of notice, and further fails to explain how appellants were harmed by the failure to present such arguments. The majority's failure to adequately address the requirement to show harm is especially critical given the trial court's statement in the order that it had "fully considered" appellants' summary judgment responses as if timely filed.
For these reasons, we would hold that appellants waived their "no notice" challenge to the summary judgment and would overrule appellants' first issue.

Inadequate Time for Discovery
Because we would hold that appellants failed to preserve their "no notice" challenge to the summary judgment and would overrule their first issue, we would address their second and third issues, in which they argue, respectively, that summary judgment was improperly granted because inadequate time for discovery had passed, and summary judgment was barred by the doctrine of quasi estoppel.
In their second issue, appellants argue that the trial court erred by granting summary judgment prior to the end of the discovery period and while discovery had been stayed by the trial court.
A party may move for a no-evidence summary judgment "after adequate time for discovery." TEX.R. CIV. P. 166a(i); Specialty Retailers, Inc. v. Fuqua, 29 S.W.3d 140, 145 (Tex. App.-Houston [14th Dist.] 2000, pet. denied). The rule does not require that discovery must have been completed, only that there was "adequate time." Specialty Retailers, Inc., 29 S.W.3d at 145 (citing In re Mohawk Rubber Co., 982 S.W.2d 494, 498 (Tex.App.-Texarkana 1998, orig. proceeding)). The comment to the rule change that created the no-evidence summary judgment mechanism states that "ordinarily a motion under paragraph (i) would be permitted after [a period set by a pretrial order] but not before." Tex.R. Civ. P. 166a(i), cmt. This comment, unlike other notes and comments in the rules of civil procedure, was intended to inform the construction and application of the rule. See id.; Specialty Retailers, 29 S.W.3d at 145.
A trial court's determination that there has been inadequate time for discovery is reviewed under an abuse of discretion standard. Specialty Retailers, 29 S.W.3d *344 at 145; McClure v. Attebury, 20 S.W.3d 722, 729 (Tex.App.-Amarillo 1999, no pet.); Dickson Constr. v. Fidelity & Deposit Co., 5 S.W.3d 353, 357 (Tex.App.-Texarkana 1999, pet. denied). A trial court abuses its discretion when it acts arbitrarily, unreasonably, or without reference to any guiding rules or principles. City of Brownsville v. Alvarado, 897 S.W.2d 750, 754 (Tex.1995); Downer v. Aquamarine Operators, Inc., 701 S.W.2d 238, 243 (Tex.1985). The question of whether a nonmovant has had an adequate time for discovery under rule 166a(i) is case-specific. Tempay, Inc. v. TNT Concrete & Constr., Inc., 37 S.W.3d 517, 522 (Tex.App.-Austin 2001, pet. denied); McClure, 20 S.W.3d at 729.
To determine whether adequate time for discovery has passed, appellate courts have considered the following non-exclusive list of factors: (1) the nature of the case; (2) the nature of the evidence necessary to controvert the no-evidence summary judgment; (3) the length of time the case was active; (4) the amount of time the no-evidence motion had been on file; (5) whether the movant had requested stricter deadlines for discovery; (6) the amount of discovery which has already taken place; and (7) whether the discovery deadlines were specific or vague. Martinez v. City of San Antonio, 40 S.W.3d 587, 591 (Tex.App.-San Antonio 2001, pet. denied); Specialty Retailers, 29 S.W.3d at 145; Dickson Constr., 5 S.W.3d at 356.
When a party contends that it has not had adequate opportunity for discovery before a summary judgment hearing, it must file either an affidavit explaining the need for further discovery or a verified motion for continuance. See TEX.R. CIV. P. 166a(g), 251, 252; Tenneco, Inc. v. Enterprise Prods. Co., 925 S.W.2d 640, 647 (Tex.1996); Tempay, 37 S.W.3d at 521-22; Triad Home Renovators, Inc. v. Dickey, 15 S.W.3d 142, 145 (Tex.App.-Houston [14th Dist.] 2000, no pet.) (holding that appellants failed to preserve complaint of inadequate time for discovery in granting of no-evidence summary judgment motion by failing to file affidavit explaining the need for further discovery or verified motion for continuance); Jaimes v. Fiesta Mart, Inc., 21 S.W.3d 301, 304 (Tex.App.-Houston [1st Dist.] 1999, pet. denied) (finding no error in trial court's ruling on no-evidence summary judgment motion where non-movant claimed inadequate time for discovery, but failed to file sworn motion for continuance or affidavit stating reason additional time for discovery was needed).
Here, appellants neither filed an affidavit explaining the need for further discovery nor a verified motion for continuance. Accordingly, we would hold they have failed to preserve their complaint that they did not have adequate time for discovery. See Triad, 15 S.W.3d at 145-46; Fiesta Mart, Inc., 21 S.W.3d at 304.
Even if appellants had preserved their complaint of inadequate time for discovery, we would find that the trial court did not abuse its discretion in granting Phillips's no-evidence summary judgment motion. Although these are complex cases involving allegations of subsurface hydrocarbon contamination, they had been pending for several years prior to Phillips filing its no-evidence summary judgment motion.[11] Except for the very brief period of time immediately preceding judgment, during which discovery was stayed, appellants had ample opportunity to conduct discovery regarding Phillips's role, if any. Accordingly, we would hold that it was not an abuse *345 of the trial court's discretion to conclude that an adequate time for discovery had passed, and overrule appellants' second issue.

Quasi Estoppel
In their third issue, appellants assert that the doctrine of quasi estoppel barred summary judgment in this case. Appellants argue that prior to filing its motions for summary judgment, Phillips filed a motion to dismiss or abate, in which it judicially admitted that contamination leaked from underground storage tanks located on its property. Thus, appellants contend that Phillips is barred from asserting in its motions for summary judgment that there is no evidence that contaminants escaped from its property and contributed to contamination in the area.
Quasi estoppel precludes a party from asserting, to another's disadvantage, a right inconsistent with a previously-taken position. Atkinson Gas Co. v. Albrecht, 878 S.W.2d 236, 240 (Tex.App.-Corpus Christi 1994, writ denied). The doctrine applies when it would be unconscionable to allow a person to maintain a position inconsistent with one in which he acquiesced, or of which he accepted a benefit. Id.; Steubner Realty 19, Ltd. v. Cravens Rd. 88, Ltd., 817 S.W.2d 160, 164 (Tex.App.-Houston [14th Dist.] 1991, no writ); El Paso Nat'l Bank v. Southwest Numismatic Inv. Group, Ltd., 548 S.W.2d 942, 948 (Tex.Civ.App.-El Paso 1977, no writ).
We find appellants' argument that summary judgment was barred by the doctrine of quasi estoppel to be without merit. Phillips's motion to dismiss or abate challenged the trial court's jurisdiction over the case, arguing that the matter was properly before the Texas Natural Resource Conservation Commission ("TNRCC"), and that the litigation should therefore be abated or dismissed pending the TNRCC's review. We have carefully reviewed Phillips's motion to dismiss or abate, and find no support for the argument that Phillips asserted a position contrary to the position it asserted in its motions for summary judgment. Although in its motion to dismiss or abate, Phillips acknowledges "the existence of hydrocarbon contamination on its property," it notes that the TNRCC "will evaluate the evidence and determine whether or not [such contamination] contributed to the hydrocarbon contamination allegedly beneath the Plaintiffs' property ..." (emphasis added). Thus, we find nothing in Phillips's motion or supporting documentation that would constitute a judicial admission of appellants' theories of recovery against Phillips. We therefore would overrule appellants' third issue.
Because we would hold that the trial court did not abuse its discretion in granting summary judgment in Phillips's favor, we respectfully dissent.
Justice FEDERICO G. HINOJOSA joins.
Opinion by Justice CASTILLO, concurring on motion for rehearing.
Respectfully, I concur with the result of the majority opinion.
NOTES
[1]  Retired Justice J. Bonner Dorsey was a member of the en banc panel which heard oral argument on appellant's motion for rehearing and motion for rehearing en banc, which were considered on October 16, 2002. Following his retirement on December 31, 2002, Justice Dorsey was assigned to this Court by the Chief Justice of the Supreme Court of Texas pursuant to TEX. GOV'T CODE ANN. § 74.003 (Vernon 1998) to "complete the adjudication of any and all causes assigned to a panel of which [he was] a member" prior to his retirement. Justice Dori Contreras Garza, whose term of office on this Court began on January 1, 2003, did not participate in this decision.
[2]  Reference to appellant Aguirre in this appeal includes appellants Antonio G. Aguirre, Miriam M. Aguirre, Eva Reyna-Ayala, Eva America Ayala, Omar O. Cavazos, Yvette Cavazos, Ramiro Cavazos, individually and d/b/a/ Centro Musical, Dario Garcia, Laurentina Garcia, Juanita E. Garza, Servando Guerra, S & H Jerrypat, Inc., d/b/a McAllen Grocery, Genaro Hernandez, Sr., Genaro Hernandez, Jr., Valley Modern Plumbing & Hardware Inc., Margarita E. Hernandez, Hernandez Modern Enterprises, Inc., Narciso J. Jacobo, Mario Jacobo, Enrique Molina, Maricela Molina, Molina's Mexican Goods & Bakery, Inc., Ruben B. Molina, Jr., Ofelia Molina, Alejandro Rodriguez, Olivia Rodriguez, Valley Pride Food Distributors, Inc., Emilio G. Rodriquez, Sr., individually and as Independent administrator of the Estate of Maria Olivia Rodriguez, Martin R. Lopez, Antonio S. Lopez, Jose Luis Martinez, Maria Elena Martinez, individually and d/b/a Martinez Laundromat, Ofelia Briseno, Pablo Salinas-Garza, Rene Sanchez, individually and d/b/a Rene's Garage, Jose Salinas, Jr., Maria de la Luz Salinas, Jose R. Flores, Elida R. Flores, Alejandro Rodriquez, Maria Carmen Rodriguez, Lucio Jimenez, Guadalupe R. Jimenez, individually and d/b/a Jimenez Welding Shop, Arturo Ballesteros, Sr., Maria Ballesteros, Dora Alonzo, and First National Bank, f/k/a First National Bank-Edinburg.
[3]  The trial court cause numbers are C-4570-95-F, C-4597-92-E, C-4566-95-B, C-4565-95-A, and C-4568-95-D.
[4]  Reference to appellant Chevron includes Chevron U.S.A., Inc., Ultramar Diamond Shamrock Corp., Canadian Oxy Production Co., American Exploration Co., Louis Dreyfus Natural Gas Corp., Faulconer Energy Joint Venture-1988, Faulconer Energy Corp., Vernon E. Faulconer, Inc., Brownies Oil Co., and Spurgeon Brown.
[5]  Phillips Properties was also named as a defendant in cause numbers C-4597-92-E, C-4566-95-B, and C-4570-95-F.
[6]  The cases are characterized as being the "northern plume" and "southern plume," in reference to two areas of alleged contamination. The southern plume cases were severed into cause number 4597-92-1-E. This appeal involves a summary judgment granted in the northern plume trial cases, which were severed into cause number 4597-92-E.
[1]  At a March 8, 2000 hearing, the parties discussed a January 26, 2000 hearing before the court "where it was decided there was going to be a severance in this case." The court reporter's record of the January 26, 2000 hearing is not included in the record before this Court.
[2]  Like the January 20 motion, the January 28 motion "moves for summary judgment against plaintiff, ANTONIO AGUIRRE, ET AL," and refers throughout to "the plaintiffs." Accordingly, the January 28 motion pertains to all plaintiffs alleging claims against Phillips in the unconsolidated case, cause number C-4565-95-A.
[3]  There is no "Defendant's Amended Motion for Summary Judgment as to all Plaintiffs [sic] Claims" included in the record before us.
[4]  The February 1, 2000 motion was filed in the four other cause numbers (not Aguirre), except that cause number C-4597-95-E was included, and cause number C-4597-92-E was not.
[5]  The "Northern" and "Southern" plumes referred to the claims of groups of plaintiffs against particular groups of defendants. The "Southern Plume" defendants were Coastal Mart, Inc., Maxey Grossenbacher, McAllen National Bank, and Israel Rodriguez. The "Northern Plume" plaintiffs included the Ayalas and "Northern Plume" defendants included Phillips.
[6]  The order reflects that summary judgment was granted in C-4597-95-E, not in the consolidated and severed Northern Plume cause number C-4597-92-E.
[7]  At the hearing, Diamond Shamrock noted that it was deprived of an opportunity to respond to Phillips's motion because it did not receive notice of hearing or notice of submission regarding the motion. Similarly, defendants Chevron and Canadianoxy represented to the trial court that they did not receive notice of a hearing or notice of submission regarding Phillips's motion. Thus, although appellants argued to the court that "apparently none of the Defendants got notice of either the hearing or the submission on [Phillips's] Motion for Summary Judgment," they did not at any time represent to the court that they had been deprived of such notice. Instead, appellants argued only that they had relied on the court's January 26, 2000 order in believing that the court had stayed all proceedings until the conclusion of the Southern Plume trial.
[8]  The Craddock test, applicable in determining whether to set aside a default judgment, requires a movant for new trial to show that: (1) the defendant's failure to appear was not intentional, or the result of conscious indifference, but was due to mistake or accident; (2) the defendant had a meritorious defense; and (3) the motion for new trial was filed when it would not occasion a delay or otherwise work an injury to the plaintiff. Craddock v. Sunshine Bus Lines, Inc., 134 Tex. 388, 133 S.W.2d 124, 126 (1939).
[9]  In Smith, Smith argued he did not receive any of the documents or motions in the case because his address had changed. See Smith v. Mike Carlson Motor Co., 918 S.W.2d 669, 671 (Tex.App.-Fort Worth 1996, no writ).
[10]  Appellants' "no notice" claim rests primarily on two arguments: (1) the record does not show certificates of service for the orders setting hearing (for either the January 26, 2000 order setting submission on Phillips's motion as to Aguirre or the January 28, 2000 order setting submission on Phillips's amended motion as to all plaintiffs); and (2) even if appellants did receive notice, such notice was negated by the trial court's two "stay orders" of January 26, 2000 and February 28, 2000. To preserve a challenge to summary judgment on the basis of no notice, appellants were required to file a sworn motion for new trial verifying, by affidavit or other competent evidence, the facts supporting each of these explanations as to why they lacked notice. See Smith, 918 S.W.2d at 672. Because appellants also failed to preserve any challenge based on their argument that the stay orders negated notice, if any, we need not separately address those claims.
[11]  Although the original petitions are not included in the record before us, Phillips contends the "northern plume" claims had been ongoing for approximately five years at the time Phillips filed its no-evidence motions.
