Level 1 Water-Quality Inventory of Baseline Levels of Pesticides in Urban Creeks - Golden Gate National Recreation Area and the Presidio of San Francisco, California

Hladik, Michelle L.; Orlando, James L.

Abstract:

To characterize baseline water-quality levels of pesticides in Golden Gate National Recreation Area and the Presidio of San Francisco, the U.S. Geological Survey collected and analyzed surface-water and bed-sediment samples at 10 creeks during February, April, and July 2006. Pesticide data were obtained using previously developed methods. Samples from sites in the Presidio were analyzed only for pyrethroid insecticides, whereas the remaining samples were analyzed for pyrethroids and additional current and historical-use pesticides. Pesticide concentrations were low in both the water (below 30 ng/L) and sediment (below 3 ng/g). The pyrethroid bifenthrin was detected in water samples from two sites at concentrations below 2 ng/L. Other compounds detected in water included the herbicides dacthal (DCPA) and prometryn, the insecticide fipronil, the insecticide degradates p,p‘-DDE and fipronil sulfone, and the fungicides cyproconazole, myclobutanil and tetraconazole. The only pesticides detected in the sediment samples were p,p‘-DDT and its degradates (p,p‘-DDD and p,p‘-DDE). Pesticide information from the samples collected can provide a reference point for future sampling and can help National Park Service managers assess the water quality of the urban creeks.

Genre:

USGS Numbered Series

ProdID:

81821

Citation Author:

Hladik, Michelle L.; Orlando, James L.

Citation Contributing Office:

USGS California Water Science Center

Citation Datum:

Citation Day:

Citation Edition:

Citation Editor:

Citation End Page:

Citation Issue:

Citation Keywords:

Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0381000

Citation LatS:

0372500

Citation LonE:

-1221000

Citation LonW:

-1225000

Citation Month:

Citation No Pagination:

Citation Number Of Pages:

Citation Online Only Flag:

Citation Phsyical Description:

vi, 14 p.

Citation Projection:

Citation Public Comments:

Prepared in cooperation with the National Park Service

Citation Publisher:

Geological Survey (U.S.)

Citation Series:

Data Series

Citation Series Code:

Citation Series Number:

338

Citation Search Results Text:

Level 1 Water-Quality Inventory of Baseline Levels of Pesticides in Urban Creeks - Golden Gate National Recreation Area and the Presidio of San Francisco, California; 2008; DS; 338; Hladik, Michelle L.; Orlando, James L.