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The Acetochlor Registration Partnership State Ground Water Monitoring Program

^a LFR Levine·Fricke, 1900 Powell Street, 12th Floor, Emeryville, CA 94608
^b Syngenta Crop Protection, P.O. Box 18300, Greensboro, NC 27419
^c Monsanto Company, 800 North Lindbergh Boulevard, St. Louis, MO 63167
^d Dow AgroSciences LLC, 9330 Zionsville Road, Indianapolis, IN 46268
^e Klein & Associates, LLC, 12917 Topping Estates Drive, Town & Country, MO 63131
^f Syngenta Ltd., Jealott's Hill Research Station, Bracknell, Berkshire, England RG42 6ET
^g LFR Levine·Fricke, 630 Tollgate Road, Suite D, Elgin, IL 60123
^h LFR Levine·Fricke, 3382 Capital Circle NE, Tallahassee, FL 32308

View larger version (88K): [in a new window]   Fig. 1. Typical monitoring program plot features and well construction details.

View larger version (28K): [in a new window]   Fig. 2. Location of monitoring program sites.

View larger version (22K): [in a new window]   Fig. 3. Minimum, maximum, and mean depths to water for all program wells.

View larger version (9K): [in a new window]   Fig. 4. Co-occurrence of acetochlor parent and acetochlor soil degradate (tertiary amide sulfonic acid and tertiary amide oxanilic acid) residues. Values reflect the number of program wells with observed residues in samples collected from 1999 through study completion. ESA, ethanesulfonic acid; OXA, oxanilic acid.

View larger version (9K): [in a new window]   Fig. 5. Co-occurrence of alachlor parent and alachlor soil degradate (tertiary amide sulfonic acid and tertiary amide oxanilic acid) residues. Values reflect the number of program wells with observed residues in samples collected from 1999 through study completion. ESA, ethanesulfonic acid; OXA, oxanilic acid.

View larger version (9K): [in a new window]   Fig. 6. Co-occurrence of metolachlor parent and metolachlor soil degradate (tertiary amide sulfonic acid and tertiary amide oxanilic acid) residues. Values reflect the number of program wells with observed residues in samples collected from 1999 through study completion. ESA, ethanesulfonic acid; OXA, oxanilic acid.

View larger version (26K): [in a new window]   Fig. 7. Co-occurrence of parent herbicide (acetochlor, alachlor, atrazine, and metolachlor) residues. Values reflect the number of program wells with observed residues. No parent herbicide residues were observed in 64 of the 182 wells.

View larger version (12K): [in a new window]   Fig. 8. Co-occurrence of (a) tertiary amide sulfonic acid (ethanesulfonic acid, ESA) soil degradate residues and (b) tertiary amide oxanilic acid (OXA) soil degradate residues. Values reflect the number of program wells with observed residues. No ESA soil degradate residues were observed in 49 of the 182 wells and no OXA soil degradate residues were observed in 110 of the 182 wells.