Bacterial Numbers Lab Report-guidelines

Bacterial Numbers Lab Report-guidelines - Bacterial Numbers...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Bacterial Numbers Lab Report The Scenario Your team collected a sample from Severn River, MD, right outside the Naval Academy. In this particular section of the river cadets train for their sailing competitions and rescue of water accident victims, with means that they are in direct contact with the water, where they frequently swim. The director of the Naval Academy contacted your team because he received a memo indicating concerns regarding the level of E. coli contamination in the river’s water, specially because there is suspicion that some business and private vessels are inadequately disposing of their waste directly into the river. Upon collection of the sample (we will consider that Tube #1 was a sample from the Severn River water) your team performed a viable cell count to determine if the water is adequate for recreation or not, based on EPA’s standards. For the purpose of our report let’s pretend you were collected 10mL of water. Regulation of Recreational Water State and local governments establish and enforce regulations to protect recreational water against naturally occurring or human-made contaminants. Standards for operating, disinfecting, and filtering public swimming and wading pools are regulated by state and local health departments and, as a result, vary throughout the United States. In 1986, EPA published guidelines for microbiologic water quality for recreational freshwater (e.g., lakes and rivers) and marine water (EPA, 1986). For freshwater, the guideline recommends that the monthly geometric mean water-quality indicator concentration be < 33 CFU/100 mL for enterococci or < 126 CFU/100 mL for Escherichia coli . For marine water, the guideline recommends that the monthly geometric mean water-quality indicator concentration be < 35 CFU/100 mL enterococci. States have latitude regarding their guidelines or regulations and can post warning signs to alert
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
potential bathers until water quality improves. Unlike treated venues, in which disinfection can be used to address the majority of problems with the microbiologic quality of water, contaminated freshwater can require weeks or months to improve or return to normal. However, pools in treated venues might need to be closed until the water has been adequately treated and filtered or the pool drained and refilled to remove protozoan contamination. Prompt identification of potential sources of contamination and remedial action is necessary to return bathing water to an appropriate quality for recreational use. EPA's Action Plan for Beaches and Recreational Waters (Beach Watch) was developed
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/07/2008 for the course CHEM 115 taught by Professor Hatwell during the Spring '08 term at Villa Julie.

Page1 / 8

Bacterial Numbers Lab Report-guidelines - Bacterial Numbers...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online