A flowing artesian well tapping the Floridan aquifer at Chekika Hammock State Park, Dade County, Florida, has been contaminating the overlying Biscayne aquifer with saline water since 1944. The contaminating plume extends approximately 7 miles downstream and southeast of the well and ranges in width from 1 to 2 miles. The area of contamination is approximately 12 square miles. The primary contaminating chemical constituents are chloride, sodium, and sulfate ions. 17. Document Analysis a. Descriptors *Water quality, *Ground water, *Electric conductance, *Water pollution, Saline water b. Identifiers/Open-Ended Terms Floridan aquifer, Everglades, Grossman well, Dade County, Biscayne aquifer c. COSATI Field/Group 18. Availability Statement No restriction on distribution. 19. Security Class (This Report) Unclassified 20. Security Class (This Page) Unclassified 21. No. of Pages 26 22. Price (See ANSI-Z39.18) See /instructions on Reverse OPTIONAL FORM 272 (4-77) (Formerly NTIS-35)