Question: The shooting of Stephen Ballard took place at what chain of gas stations?

Context articles: Shooting of Stephen Ballard
High's Dairy Store
Quick Chek
H. Earl Clack Service Station
Wawa Inc.
Horne's (restaurant)
Gad Zeevi
Marc Trujillo
Mohawk Oil
Corporación Trebol Gas C.A.

Corporal Stephen J. Ballard (1985 – 26 April 2017) was a Delaware State Police Officer.
 On 26 April 2017 Cpl. Ballard was shot and killed after approaching a suspicious vehicle at a Wawa in Bear, Delaware.
 Ballard was the first Delaware state police officer to be killed on duty since 1972.
High's of Baltimore, LLC, doing business as High's Dairy Stores, is an American chain of gas stations and convenience stores based in Baltimore, Maryland.
 As of 2016, the chain has 45 locations, all of which are in Maryland.
 High's previously had stores in Virginia, Delaware and Washington, D.C. as well.
 High's is currently owned by the Baltimore-based Carroll Independent Fuel Company.
Quick Chek is a privately owned, Whitehouse Station, New Jersey based chain of convenience stores with 140 stores in New Jersey and New York.
 The first store opened in Dunellen, New Jersey in 1967, and has since then grown into a chain.
 Several stores include pharmacies, gas stations, and liquor departments.
It was one of a number of gas stations in H. Earl Clack's chain of filling stations, and was probably built in the early 1930s.
 It was used as a gas station into the 1960s, and in 1994 served as restrooms for a park.
Wawa Inc. is a chain of convenience store/gas stations located along the East Coast of the United States.
 It operates in Pennsylvania, New Jersey, Delaware, Maryland, Virginia, and Florida.
 The company's corporate headquarters is located in the Wawa area of Chester Heights, Pennsylvania in Greater Philadelphia.
 s of 2008 , Wawa was the largest convenience store chain in Greater Philadelphia, and it is also the third-largest retailer of food in Greater Philadelphia, after ACME Markets and ShopRite.
Horne's was a Southern-style restaurant chain located primarily in the Southeast and Southern United States along major highways.
 It was headquartered in Bayard, Florida.
 At the chain's peak there were over 60 Horne's locations, but today only one original restaurant remains.
 Many restaurant locations featured diner-style sit-down service as well as lodging, Texaco gas stations, gift shops, and an ice cream bar, creating a one-stop shop atmosphere.
 Since many locations were on highways, many Horne's restaurants were open 24 hours a day, 7 days a week.
Gad Zeevi (Hebrew: גד זאבי, also Gad Zevi; born November 13, 1939) is an Israeli industrialist.
 Zeevi is the owner and chairman of the Zeevi Group, a multimillion-dollar private equity corporation.
 The Zeevi Group, through its subsidiaries, produces, refines, and sells petroleum products.
 It manages petroleum refineries and a chain of gas stations in the United States.
 The company also engages in the construction and exploitation of electric power stations, producing electric power for the national network; development, building, and construction of city housing estates, trade centers, places of residence, grain elevators, airports, water projects, and roads in Africa, America, and Israel; and distribution of automobiles.
 In addition, the Zeevi Group provides information technologies, logistical, retailing, and other business services, as well as medical equipment and sanatoria.
His paintings depict places common to North American urban and suburban landscapes such as big chain and warehouse stores, gas stations, shopping malls, and chain restaurants.
Mohawk is a chain of gas stations in Canada that is wholly owned by Husky Energy.
 Mohawk was an independent chain of gas stations before acquired by Husky in 1998.
Corporación Trebol Gas C.A. is a Venezuelan privately owned oil company reporting 280 gas stations located in every state of the country and about 16% of the oil distribution market in Venezuela.
 Trebol was founded in 1998 and is a chain of gas stations, each operated by a franchisee. Almost every gas station has a convenience store and sells Venoco lubricants.