Work is well under way on new artificial turf playing fields at Leo Mullen Sports Park in Encinitas, and kids should be able to play on the new surface soon if all goes as planned. Part of the project’s $1 million price tag is being covered by a $171,248 water rebate from the Metropolitan Water District, and in order to receive that money, the city has to have the construction activity “substantially complete” by Sept. 6. “We actually think we’ll get the project done before that,” said city Public Works Director Glenn Pruim.