A state board that controls the sale of alcohol has been keeping an eye on the town of Oak Bluffs this spring, and the result this week was citations to four establishments for selling alcohol to minors.

The most serious violator is The Ritz Cafe, which has been ordered to close its doors for 10 days in July by the state Alcoholic Beverages Control Commission (ABCC).

A 17-year-old male working undercover for the ABCC on April 4 was served a beer at the Ritz and also bought alcohol at Tony’s market, O-Sun and Bangkok Thai Cuisine — all without being carded, the Oak Bluffs selectmen learned in a letter from the ABCC this week.

The harshest penalty went to the Ritz, because this is the eighth violation since 2000. The well-known bar will be asked to close from July 15 to July 25; the owners have 30 days to appeal the decision.

Oak Bluffs town administrator Michael Dutton said at the selectmen’s meeting Tuesday that he expects the Ritz will appeal to move the closure to the fall or winter, to avoid losing so much business during the short summer season.

Tony’s Market, which has had no prior violations, was issued a warning by the ABCC, after owner David Richardson responded in detail, saying that the employee who made the sale had since been taken off the cash register, and that in the future all employees will be required to go through alcohol sales training.

The violations also were a first offense for O-Sun and Bangkok Thai Cuisine, which were handed three-day suspensions; the suspensions were stayed providing there are no violations for the next two years.

On Tuesday selectmen also heard a report from town administrator Michael Dutton about a diesel spill at the White-Brothers Lynch garage at 20 Vineyard avenue early Thursday morning.

An incident report from assistant fire chief Anthony Ferreira said the fire department was dispatched just before 8 a.m., and upon arrival observed a sheen of petroleum coming out of the parking area. Half of a five gallon bucket spilled on the ground and an employee used a special type of soap to break up the spill and used a hose to try and dilute it, he said.

“It appears at this time the release was accidental, the result of a vehicle fueling,” the report from Mr. Ferreira said. “The exact quantity of product released is unknown, but did not appear at the time to be a significant amount, although dispersed into the rain water made it appear to look significant.”

Later in the meeting, Vineyard avenue resident Matt Cramer said the spill might have been more serious, and may have spilled into the wetlands behind School street or mixed with the groundwater. Mr. Cramer said fuel also got into his lawn and garden.

“The entire area smelled like diesel fuel . . . it really was a bad situation,” Mr. Cramer said. ““How do we prevent them from washing it into the street. And why weren’t they containing it on their property, with some type of absorbent materials?”

Selectman Kerry Scott said she talked to town health agent Shirley Fauteux, who was unaware of the spill.

“In this case the fire department didn’t notify the board of health, and that’s unfortunate.”

After the meeting, fire chief Peter Forend said the department of environmental protection (DEP) does not need to be notified of spills under 10 gallons. He said the spill was minor and was contained quickly.