The Department of Energy on Monday will issue regulations for several new standby gasoline conservation measures, including a one-day mandatory reduction in the work week, banning weekend use of pleasure boats, and banning use of all the vehicles in a household on one to three days a week.

The new measures, which are certain to be controversial, could be imposed by the president in states not meeting their targets for a cut in gasoline use after he had declared an energy emergency, presumably because of an interrupton in the nation's oil supply.

After declaration of an emergency, the states would have 45 days to draw plans for meeting mandatory consumption cuts sets by DOE, and the government would have 30 days to okay the plans. If there is at least an 8-percent oil shortage and a state was not meeting its targets, then the president could impose any or all of the nine measures to be published Monday. p

The other measures will include:

Requiring employers of large workforces to take steps to reduce work-related travel, including commuting by car. This could involve anythng from reducing parking space for single-occupant cars, subsidizing public transit costs for employes, van pools and so forth.

State-sponsored advertising campaigns intended to increase use of mass transit, car pools and other energy saving ideas.

Odd-even gasoline sales restrictions.

Minimum gasoline purchase requirements, probably $7 for large cars and $5 for small cars.

Stricter enforcement of the present 55-mph speed limit, and perhaps lowering it to 50-mph.

Making permanent the present mandatory controls on non-residential building temperatures, which expire in April but can be extended by the president.

DOE officials hope to avoid use of any mandatory measures, including most of these, unless a significant oil shortage develops, which most of them think is unlikely in 1980.

All of the measures except the two directly restricting boat and car use will be issued as "interim final regulations" which means the president could impose them at any time consistent with the timetable for developing and implementing the state conservation plans.

The two covering boat and car use will be "proposed regulations," which means they could not be used before the end of a 60-day comment period.

Meanwhile, the administration plans five regional meetings next week with representatives from each state concerning details of the voluntary gasoline conservation plans they are developing.

President Carter has said that if the states do not meet their voluntary targets, he will make their plans mandatory and, in that event, could use some of the measures that will be made public on Monday.

Initially, the states were given proposed targets by the administration that were consistent with average national use of 7 million barrels a day of gasoline in 1980. Last year's use averaged 7.05 million barrels a day, and Energy Secretary Charles Duncan cautioned this week that the 7 million barrel target might be tightened. A barrel has 42 gallons.