RICHMOND, FEB. 15 -- The House of Delegates today passed and sent to the Senate legislation that would give voters the chance in November to decide if they want to allow parimutuel betting on horses in Virginia.

Meanwhile, in the Senate, a proposal to allow a private company to build a for-profit extension of the Dulles Toll Road from Dulles International Airport to Leesburg won committee approval, setting the stage for a critical vote on Tuesday.

In other action during its day-long session, the House gave preliminary approval to dozens of proposals, including a Chesapeake Bay cleanup bill that lawmakers said could profoundly change land-use planning in a number of Tidewater counties and several counties in Northern Virginia.

The House also handed state Attorney General Mary Sue Terry a victory by endorsing the creation of a new felony offense called "intoxicated vehicular homicide," which prosecutors could levy against motorists or train operators who kill others while intoxicated.

The horse-racing measure passed on a vote of 54 to 45, with Northern Virginia's delegation splitting 13 to 8 in favor of putting the issue to a referendum.

In contrast to the emotional, one-hour debate that preceded Saturday's preliminary 50-to-45 vote, today's discussion was brief and matter-of-fact.

After today's vote, the bill's chief sponsor, House Minority Leader Raymond R. (Andy) Guest Jr. (R-Front Royal), predicted easier going in the Senate, which historically has supported the idea.

Guest noted that voters responded "loud and clear" in November in a referendum that endorsed a lottery for Virginia, but declined to handicap the outcome on horse-racing, saying, "I'm not a betting man."

Virginia voters rejected gambling on horse racing a decade ago, but Guest said this year's vote, which would coincide with a presidential election, would attract a larger and more representative turnout.

An opponent, Del. William T. Wilson (D-Covington), warned that horse racing would bring to Virginia the same "adverse consequences," including organized crime, that he said it has to Maryland, New Jersey, New York and other states that permit parimutuel betting.

Del. Harvey B. Morgan (R-Gloucester) predicted an increase in lesser crimes also, such as pickpocketing, money laundering and loan sharking.

"Some people see evil in everything," responded Guest, who represents an area of the Shenandoah Valley that has a number of horse farms and horse owners.

The proposal now moves to the Senate, where its chief patron is Sen. Richard L. Saslaw (D-Springfield).

Gov. Gerald L. Baliles has taken no position on the question, but aides have indicated he is likely to sign the bill if it gets to his desk. As a member of the House of Delegates, Baliles voted in favor of putting the question to the voters.

Final Senate action on the toll road proposal is scheduled for Wednesday. The proposal was detoured last week by Sen. Thomas J. Michie Jr. (D-Charlottesville). Today, Michie said he is satisfied that the legislation now contains adequate protections so that the private operators cannot put the state "in the embarrassing situation of either going broke or making scads of money."

The toll road plan was one of the last bills to win committee approval as the Virginia General Assembly raced to meet a Wednesday deadline for each chamber to act on its own bills. The 1988 legislative session ends March 12.

The Chesapeake Bay bill, which grew out of an 18-month study by a round table of legislators, local officials and business representatives, marked a major turning point in Virginia's strategy to clean up the troubled estuary and the state government's traditional hands-off approach to local development policies, according to supporters and opponents alike.

Del. W. Tayloe Murphy Jr. (D-Westmoreland), one of the assembly's leading bay champions, said the bill would expand the authority of localities to regulate shoreline development, while creating a new department and oversight board at the state level to develop land-use rules to guide Tidewater communities.

As defined by Murphy's bill, which he introduced at the behest of Baliles, the Tidewater region includes the cities of Alexandria, Fairfax and Falls Church, as well as Arlington, Fairfax, Prince William and other counties along the bay and the rivers that feed it.

Murphy, aware that several rural legislators oppose the bill, said there was nothing in the legislation allowing the state oversight board to "substitute its judgment" for local zoning agencies. "The purpose of the {state} criteria is not to stop growth," Murphy said.

However, the state would be able to challenge land-use decisions in the courts if it believes a locality is not doing its part to safeguard water quality in the bay, Murphy added.

Del. Robert S. Bloxom (R-Accomack) made an impassioned appeal to defeat the measure, saying it would allow the state to usurp what traditionally has been a local prerogative.

"The concept is correct, but I tell you the approach and the method is wrong," said Bloxom. He called Murphy's bill a "monstrous detour" from the state's established policies for restoring the bay.

In other action, the House narrowly approved, 50 to 48, a measure by Del. Marian Van Landingham (D-Alexandria) to allow the state to contract with attorneys and collection agencies to collect unpaid fees and fines, paying them a percentage of the proceeds.

The House also tentatively approved bills authorizing state officials to create a revolving fund to pay for new and rehabilitated housing units; requiring the state to list the odds for the lottery beginning this spring, and allowing residents to pay court fines with checks or credit cards. Staff writer Sandra Evans contributed to this report.