OPINION
Opinion by
Martin Perez sued the City of Dallas under a theory of premises liability for injuries he sustained when he fell from the bed of his truck into an open pit at a trash transfer station owned and operated by the City. The trial court granted the City of Dallas’s plea to the jurisdiction where it claimed sovereign immunity and dismissed Perez’s claim against the City. In four points on appeal, Perez contends the trial court erred in granting the City’s plea to the jurisdiction, asserting that the City’s sovereign immunity was waived because the City’s trash disposal pit was an unreasonably dangerous condition, i.e., it constituted a premises defect. We decide Perez’s points against him and affirm.
I. FACTUAL AND PROCEDURAL BACKGROUND
On November 9, 2002, Perez drove his truck to the Northwest (Bachman) Transfer Station to dispose of his personal trash. The Bachman Transfer Station, which is owned and operated by the City of Dallas, is an enclosed location for disposing of trash. Upon demonstrating to a City employee that he was a resident of Dallas, Perez was directed by the City employee where to park in order to deposit his trash. He backed his truck up to the edge of the concrete pit where trash is deposited, climbed into the bed of the truck, and began unloading his trash. While unloading his truck, Perez fell from the bed of his truck into the concrete pit. He fractured *909 his wrist and suffered a comminuted fracture to his right ankle.
Perez brought this suit against the City claiming in his original and amended petitions that the cause of his injuries was a premises defect at the transfer station. He asserts that his pleadings and evidence submitted in response to the City’s plea to the jurisdiction reflect a waiver of sovereign immunity by the City based on the alleged premises defect and that he has met his burden to create at least a fact question as to the trial court’s jurisdiction. In particular, he asserts in his petitions that the alleged premises defect is a “drop-off” of seven to eight feet at the open trash pit, which was not protected by a guardrail, which he states Dallas Building Code section 1716 required, coupled with directions for use of the pit given to him by the City’s employee, in accordance with City policy.
The City filed a plea to the jurisdiction, claiming sovereign immunity. The City challenged the existence of jurisdictional facts, contending that Perez had not pled a premises defect, or in the alternative, that the City’s facility, its design, and any limitations on its use fall within the discretionary function exception to wаiver of immunity pursuant to section 101.056 of the Texas Civil Practice and Remedies Code. Evidence was submitted by both parties to support their respective positions. Perez appealed after the trial court granted the City’s plea.
II. STANDARD OF REVIEW
A plea to jurisdiction contests a trial court’s subject matter jurisdiction.
Tex. Dep’t of Transp. v. Jones,
In
Miranda^
the Texas Supreme Court identified the regimеn courts are to follow in analyzing whether a plea to the jurisdiction should be granted.
See Miranda,
III. APPLICABLE LAW
A. Premises Liability and Sovereign Immunity
In Texas, sovereign immunity deprives a tidal court of subject matter jurisdiction for lawsuits against the State or other governmental units unless the State consents to suit.
Miranda,
The Tort Claims Act expressly waives sovereign immunity in three areas: (1) property damage and personal injury caused by the use of publicly owned automobiles (section 101.021(1)); (2) personal injury caused by a condition or use of tangible personal or real property (section 101.021(2)); and (3) claims arising out of premises defects (section 101.022).
Wadley,
The Texas Tort Claims Act creates certain exceptions to the wаiver of sovereign immunity. Section 101.056 provides that the waiver provisions of the Act do not apply to claims based on: “(1) the failure of a governmental unit to perform an act that the unit is not required by law to perform; or (2) the governmental unit’s decision not to perform an act or on its failure to make a decision on the performance or nonperformance of an act if the law leaves the performance or nonperformance of the act to the discretion of the governmental unit.” Tex. Civ. Peao. & Rem. Code AnN. § 101.056. This latter provision is commonly referred to as the “discretionary function” exception.
See Mitchell v. City of Dallas,
*911
The discretionary function exception to waiver of sovereign immunity is designed to avoid judicial review of governmental policy decisions.
Mitchell,
While a governmental entity is immune from liability if an injury results from the formation of policy, a governmental entity is not, however, immune if an injury is caused by the negligent implementation of that policy.
Mitchell,
B. Statutory Construction
Because Perez argues that section 1716 of the 1973 Dallas Building Code applies to the transfer station and the City disputes that it applies, we must address the rulеs of interpretation for municipal ordinances. The same rules apply to the construction of municipal ordinances that apply to the construction of statutes.
Mills v. Brown,
Where the construction of municipal ordinances is involved, the primary duty of this Court is to carry out the intentions of the municipal lеgislative body.
Bolton v. Sparks,
If a statute is unambiguous, rules of construction or other extrinsic aids cannot be used to create ambiguity.
Fitzgerald,
IV. DISCUSSION AND ANALYSIS
In this case, Perez alleges in his second amended petition that the City’s sovereign immunity was waived because the unguarded trash disposal pit is a premises defect. The transfer station disposal location of which Perez complains in his second amended petition is an open pit with a drop-off of seven to eight feet, which is not protected by a guardrail. He argues that the unguarded pit, along with the requirements imposed on his use of the premises by the City’s operational policies and the directions given to him by the employees of the transfer station, constituted an unreasonably dangerous condition, of which the City was aware, and which caused his injuries. Perez further alleges that the placement of a guardrail at the disposal pit was required by section 1716 of the 1973 City of Dallas Building Code and the failure to comply with section 1716 removes the City’s design decision regarding the transfer station from the discretionary function exception. In its plea and here, the City contends that Perez failed to adequately plead or submit any evidence of a waiver of immunity from suit for a premises liability claim under thе Texas Tort Claims Act. The City asserts that no premises defect has been alleged *913 which falls within the Texas Tort Claims Act. Moreover, even if a premises defect was successfully alleged, the design of the pit is within the discretionary function exception, an exception to waiver of sovereign immunity. We agree with the City that immunity from suit is not waived and that the trial court did not err in granting the plea to the jurisdiction.
In this case, the City challenges the pleadings by contending that Perez did not plead a premises defect claim. Under the analytical framework articulated in
Miranda,
we must determine whether the pleader has alleged facts affirmatively demonstrating the trial court’s jurisdiction over the matter when a plea to the jurisdiction challenges the pleadings.
See Miranda,
We need not decide whether the trash pit without guardrails is a premises defect since the allegеd defect relates to the design of the transfer station. Design decisions by the City are discretionary under section 101.056.
See
Tex. Civ. Prao. & Rem.Code Ann. § 101.056;
see also Ramirez,
In an attempt to overcome the discretionary function exception, Pеrez claims that section 1716 of the 1973 City of Dallas Building Code requires the City to have guardrails around the pit. Under section 1716,
All unenclosed floor and roof openings, open and glazed sides of landings and ramps, balconies and porches which are more than 30 inches above grade or floor below, and roofs used for other than service of the building, shall be protected by a guardrail. Guardrails shall be not less than 42 inches in height. Open guardrail and stair railings shall have intermediate rails or an ornamental pattern such that a sphere 9 inches in diameter cannot pass through. The height of stair railings on open sides may be as specified in Section 3305(1) in lieu of providing a guardrail. Ramps shall, in addition, have handrails when required by Section 3306. EXCEPTION: Guardrails need not be provided on the loading side of loading docks.
It is Perez’s position that the requirement of a guardrail contained in section 1716 constitutes an act that the City was required to perform under section 101.056 of the Tort Claims Act. He urges this Court to determine that the exception for loading docks is inapplicable to the pit at the transfer station because, according to Perez, the pit does not conform with the common purposes and functions of a loading dock, which he claims are to provide for the easy crossing, back and forth, of men, machines, or materials between a building and the loading surface of a truck or rail-car.
*914 The City contends that section 1716 does not apply to the transfer station because the transfer station is an enclosed locatiоn which does not fall within any of the terms mentioned in section 1716. The City notes that, by its own terms, section 1716 applies to “unenclosed floor and roof openings, open and glazed sides of landings and ramps, balconies and porches.” Furthermore, the City contends that even if section 1716 does apply to the transfer station, the exception for loading docks also applies, аnd there is no dispute that the side of the pit was for unloading trash.
Our construction of section 1716 need not address whether it applies to the “enclosed” premises at the transfer station. Rather, we need only address whether the exception for “loading docks” applies to the City’s facility. Construction of section 1716 is a legal matter.
See Dallas Morning News,
While the term “loading dock” is not defined in section 1716, the plain meaning of the words “loading dock” in section 1716 indicates a place where things are loaded or unloaded. Specifically, the term “load” is defined by Webster’s Dictionary as “[t]o put a load in or on.” WebsteR’s ThiRD Int’l Dictionary 1325 (1981);
see also Pratt-Shaw,
Perez also claims that the directions given by the City employees at the transfer station regarding his use of the trash pit amount to negligent implementation of policy and do not qualify for immunity. We disagree.
Thе negligent implementation of policy theory does not itself waive sovereign immunity. Waiver of immunity must be demonstrated under some provision of the Texas Tort Claims Act before a claim of negligent implementation of policy can be invoked.
See Pitonyak,
Perez has raised and combined separate recognized legal propositions to support his claim of waiver of sovereign immunity: a premises defect due to the absence of a guardrail around an open garbage pit and negligent implementation of policy due to allegedly faulty directions given by City employees, pursuant to City policy. Whether we analyze these propositions individually or in combination, we conclude no fact question is raised as to the jurisdictional issue by Perez’s amended petition or by the evidence submitted. Immunity from liability has not been waived. We decide Perez’s points against him.
V. CONCLUSION
Perez’s allegations fail to establish a waiver of sovereign immunity. We decide Perez’s points against him and affirm the trial court’s order of dismissal.
