The St. Johns River Water Management District performed an extensive collection effort of both sediments and biological tissues from the Lower St. Johns River.

The St. Johns River Water Management District performed an extensive collection effort of both sediments and biological tissues from the Lower St. Johns River during the summer and fall of 1996, and extending into 1997.

The St. Johns River Water Management District performed an extensive collection effort of both sediments and biological tissues from the Lower St. Johns River.

The St. Johns River Water Management District is performing an extensive collection effort of both sediments and biological tissues from the Lower St. Johns River during the summer and fall of 1996, and extending into 1997.