Master Gardener’s Soil Management
http://www.mastergardenerssandiego.org/schools/gardenbook/soil_management/testing.html
Nautilus Environment
4340 Vandever Ave.
San Diego, CA 92120
858-587-7333
http://nautilusenvironmental.com
Group Delta- San Diego
9245 Actiity Rd., Suite 103
San Diego, CA 92126
858-536-1000
https://groupdelta.com/locations/san-diego/
Wallace Laboratories
365 Coral Circle
El Segundo, CA 90245
310-615-0116
http://us.wlabs.com
Waypoint Analytical
4741 E Hunter Ave., Suite A
Anaheim, CA 92807
714-282-8777
http://www.waypointanalytical.com