Officers seized 350 mature marijuana plants last Thursday on private property abutting Walker Creek near Tomales, according to the Marin County Sheriff’s Office. The grow site sported useable bud worth $700,000 in street sales, and officers also found 100 pounds of fertilizer, some of which was spilling into the stream from bags left in the creek bed. The long-term impacts of the fertilizer spill are “intangible,” Lieutenant Doug Pittman said in an email, but sheriffs will work with California Department of Fish and Wildlife to monitor the area. The five-foot-tall plants, grown on private property without the owner’s knowledge, were irrigated with a natural spring. A helicopter spotted the grow site in July, yet subsequent monitoring revealed no suspects tending to the site. The latest bust is a follow-up to the seizure of around 1,000 plants early in July on two separate sites near Nicasio. Walker Creek is home to salmon and trout habitat, and a family of otters lives across from the grow site, Lt. Pittman said. Since 2006, he added, the Sheriff’s Marijuana Eradication Team has seized nearly a half-billion dollars from public and private lands, all with grows that arose without the landowners’ knowledge.