Inland General QAPP Workshop
May 23, 2007
Notes, HandoutsIssues
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Information - Questions
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Study
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Results
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Findings
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Conclusions
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Recommendations
Stages of a monitoring programIssues
Possible health effects from swimming
Aquatic plants taking over lake
Information need - Questions
Do bacteria levels exceed state criteria
a. Are there exotic species in lake
b. Have plant densities & coverage increased over time
Study
Sample E. coli in vicinity of swimming areas.
Annual plant mapping, identification
Spot surveys of lake several times, looking for exotics
Results
E. coli levels were between 270 - 2000 on all dates. Samples were taken during dry and wet weather.
a. 2 exotic species found.
b. Macrophyte coverage estimated at 60%, density estimated at 30-80% in those areas.
Stages of a monitoring program, with examples.
Findings
Bacteria levels exceed standards. At 8 of 10 sites, 3 highest readings occurred on wet weather events.
a. Exotic species exist, heaviest density at boat ramp.
b. 1980 study revealed coverage was 35% of lake; density was 20-40% in those areas. Density and coverage were greater in 2001 than in 1980.
Conclusions
Water is unsafe for swimming under all conditions, but especially after storm events.
a. Exotic species have appeared in the lake, probably due to non-resident boats putting in at the public boat ramp.
b. Macrophyte coverage and densities seem to be increasing, but there is a limited pool of data with which to compare.
Recommendations
Post all swimming areas. Conduct followup monitoring to locate pollution sources.

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