| Figure
3.37. |
Total chlorpyrifos concentrations in water (ppq)
at 16 RMP stations sampled in January, April, and
August 1997. 
= not analyzed, 
= below detection, M = matrix intereference, Q =
outside the QA limit. Concentrations ranged from
below detection to 950 ppq (see Appendix B
for MDLs). The highest concentration was sampled
at Sacramento River (BG20) in August. Average concentrations
were highest (725 ppq) in the Rivers in August and
lowest (56 ppq) in the Central Bay in April. All
stations were below the EPA 4-day criteria of 41,000
ppq for freshwater and 5,600 ppq for saltwater.
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