Baseline porewater and soil organic matter sampling at Bayou aux C - PowerPoint PPT Presentation

Estelle 3 Canal 2 B A Baseline porewater and soil organic matter sampling at Bayou aux C Carpes 404 (c) property 1 Christopher Swarzenski Christopher Swarzenski USGS Baton Rouge E March 4 th 2013 D EXPLANATION Porewater and soil sampling Water level Storm water sampling

Soils appear robust, healthy; porewater and fiber content data indicate breakdown of organic matter highest at site B, closest to Estelle Canal influx note: did not measure fiber content at site D because of Typha ingrowth B non-fractionated as a percent of original volume 100 1.6 m ent u u Fiber content in perce 90 i 1.5 c l m 80 a c u 1.4 70 i d s e e 1.3 60 v n l g o 50 a 1.2 s m s 40 i d Direct entry of Estelle 1.1 o o t Canal water to marshes i t fractionated as a percent of orginal volume p g 1.0 1.0 a a R 100 Fiber content in percent 0.9 90 0.8 80 0.0 0.5 1.0 1.5 2.0 2.5 70 Salinity (ppt) 60 M as N) 35 50 40 30 30 ed ammonium (uM 25 fractionated as a percentage of non-fractionated volume 90 iber content in percent 20 80 15 70 B 60 10 50 Dissolve 5 5 F 40 P. hemitomon P. hemitomon P. hemitomon mixed 0 (average of (interior, floating) (gage, non-floating) (edge, non- four marshes) floating) 0 20 40 60 80 100 120 Figure 8. Fiber content analysis of soil samples at Bayou aux Carpes marshes. Values are compared with the Dissolved ortho-phosphate (uM as P) averages from a control group of four marshes dominated by P. hemitomon at the Barataria Preserve of Jean Lafitte National Historical Park and Preserve. Values are averaged in 5-cm increments for the top 25 cm, with three replicates per depth interval.

Atrazine and fipronil concentrations in surface waters sampled March 22, 2011 3 on Runoff purposely sampled no flo Pumping Stations during a period when ow concentrations were expected d off f to be at a peak; 2 No inferences possible about p actual loads or potential SITE Atrazine Fipronil Carbaryl Metalo ‐ exposure of marshes to (ug/l) chlor (ug/l) (ug/l) contaminants (ug/l) 1 0.146 < 0.018 b.d. b.d. 2 0.238 < 0.018 b.d. b.d. 3 9.14 0.046 0.095 0.095 Detection 0.008 0.018 0.060 0.020 lvl

Water level gradients in wetlands and water surrounding the BAC 404 (c) property Hydraulic gradient Swamp (match peak of COR gage adjusted to CRMS 185) Marsh (match to TS Lee peak of COR gage adjusted to CRMS 185) appears to be from north appears to be from north CRMS 185 unadjusted j subtract .51 from Corps gage to approximate CRMS 185 beyond start date to south wetlands and 3 then to Pipeline canal/GIWW majority of 2 time; marsh water levels i h l l higher than swamp. R LEVEL IN FEET 1 Assumption: During p g WATER 0 Tropical Storm Isaac, peaks of all water level -1 stations are assumed to match match -2 2/1/11 4/1/11 6/1/11 8/1/11 10/1/11 12/1/11 Date