The investigation that led to the arrest Tuesday of nine members of an alleged cocaine smuggling ring lasted 10 months and included court-ordered wiretaps in an expensive Northern Virginia apartment and clandestine meetings by undercover drug agents.

That was the picture that emerged yesterday from testimony in U.S. District Court in Alexandria and papers filed in the case. The defendants in clude a former Arlington masseuse, and Alexandria real estate salesman and a National Airport employe.

Federal prosecutors yesterday described the investigation, which they said concentrated on East Coast cocaine trade, at a lengthy hearing before U.S. District Judge Oren Lewis at which he reduced bond for eight of the nine defendants.

Eleven alleged members of the ring were indicted Monday by a federal grand jury in Richmond. Two ware still at large. The nine arrests were announced Tuesday by police officials, who said a task force of local police and Drug Enforcement Agency agents participated in the investigation.

Lewis yesterday unsealed the 20-count indictment and affidavits filed by DEA agent Charles Howard used as the basis of r police searches fo two Virginia apartments where the extensive cocaine dealing allegedly took place.

One of the apartments is in The Representative, a condominium building located at 1101 S. Arlington Redge Road, Arlington. Defendant Michael F. Tillery, who testified he was a Vietnam veteran and a "skip tracer" for a bail bond agency owned by another defendant, told Lewis that the apartment rendted for $850 per month.

"Thaths living high on the ridge," Lewis said, to which Tillery replied, "I'm barely making it, your honor."

The other apartment is in the expensive Park Center complex, 2801 Park Center Driver, Alexandria. It was leased by "M. Hussey," which is one of the aliases allegedly used by defendant Marian Teresa Addair Starr, according to the indictment.

According to one of the affidavits, Metropolitan police Detective Michael E. Hubbard met a woman named "Ginger' on July 27, 1978, who informed Hubbard that "she could sell him multi-pound quatities of cocaine every two weeks."

"Ginger" is listed in the indictment as another alias allegedly used by Starr.

The woman then took Hubbard to another apartment, located at 5106 Columbia Pike in Arlington, where he met "Eva, a woman appearing to be of Spanihs origin. She told him them they would have to wait for Carlos," according to the affidavit.

Defendant Eva D'Oliveria, who told Lewis yesterday she lived at that address, described herself in court as a former Arlington massage parlor employe who now earns $300 a week in commissions at an area health salon.

The man identified only as Carlos was among those indicted and is still at large.

During the first meeting, Carlos gave Starr a heavy bag which the woman and Hubbard took to the Park Center apartment, the affidavit states. "There she took out a scale and weighed out a small quantity of while powder which she gave to Detective Hubbard in exchange for $1,000," according to the papers.

The powder weighed 50.2 grams and contained 10-percent cocaine, the document states.

Cocaine is an illegal narcotic which is usually "cut," or reduced in volume, by the addition of nonnarcotic substances, according to drug officials. tDuring August and September 1978 and January and April of this year, Hubbard allegedly purchased cocaine from some of the defendants at the Park Center apartment, the Representative condominium, and in a hotel room at the Hospitality House, an Arlington motel on Jefferson Davis Highway.

Tillery allegedly told Hubbard that in addition to Virginia apartments he had two other "places": on e in Maryland, and one which the affidavit states in located at 1208 Euclid St. NW, in the District.

When police raided the Representative on May 22, they found "white power," and $10,032 in cash, according to court papers.

Thirty-day wiretape on two phones in the Representative were authorized Feb. 26 by U.S. District Judge Robert Merhige Jr., according to court documents.

Other defendants include Llewyin Joseph Quander, identified in court as an employe at National Airport and a member of a long-time Northern Virginia family, and Henry J. Walker, a salesman for Mount Vernon Realty in Alexandria.

Also indicted on conspiracy and cocaine distribution charges were Wayne McNair Hargrove, Alfred D. C. McCoy and Paulette Ashton, "a/k/a Shorty," according to court papers.

The man called Carlos and defendaant William Barry Robinson have not been arrested.

Lewis reduced bond for eight defendants from $100,000 to $25,000 because of their ties to the area. Only Antonio L. Perdiz, a White Plains, N.Y., restaurant manager described by prosecutors as "the supplier of narcotics to the group," was denied bond reduction.