We use organic methods in our maintenance, without the use of toxic chemicals. We have some natural gas trucks. We recycle and re-use as a standard practice, both in our office and in the field. We use drip irrigation instead of spray. We actively promote sustainable methods in all jobs. We pioneered many sustainable practices, including the use of pervious concrete. We always use mulch, mychorrizae and compost tea to improve the soil without synthetic fertilizers.