Cross-posted from East Bay Express. When Laura Blakeney moved into her house in West Oakland, Calif. last year, she was thrilled to have a backyard. Her young daughter loved playing in the dirt. And all that space seemed perfect for a vegetable and herb garden. What she didn't see was the danger lurking in her soil. To help get the garden started, a neighbor suggested Blakeney contact City Slicker Farms, a West Oakland nonprofit that advocates for urban agriculture and installs backyard gardens in homes throughout the Bay Area. After Blakeney called to request a garden, City Slicker visited her …