Growth Watch
Second Quarter 1996

Water Quality Samples
Barton Springs
Month	Total No. Samples	Samples Excluded	Acceptable Geo Mean	No. Samples > 400	Recreation Criteria Met?
April	9	0	3	0	Yes
May	11	4	7	0	Yes
June	14	6	26	0	Yes
McKinney Falls (Upper)
Month	Total No. Samples	Samples Excluded	Acceptable Geo Mean	No. Samples > 400	Recreation Criteria Met?
April	9	1	27	0	Yes
May	8	0	12	0	Yes
June	8	2	38	0	Yes

Water samples are regularly collected and tested for fecal coliform (F/COL) bacteria because they are a common variety of microorganism relatively easy to detect and serve to indicate the extent to which pathogenic organisms, which are more difficult to detect, may be present.

The state water quality standards for contact recreation is a maximum geometric mean of 200 c/100ml for at least five samples within a 30-day period. Readings exceeding the acceptable range are common during periods of heavy rainfall.

The National Ambient Air Quality (NAAQ) Standard for ozone is 0.12 parts per million (ppm).