Ten sites were selected for the La Mesa study, all of which had been on a monthly cleaning schedule. The sites were first cleaned to establish a clean-pipe baseline, and then the ADS ECHO monitors were installed.
The city of La Mesa is located in San Diego County, California, 12 miles east of downtown San Diego. The “Jewel of the Hills” boasts being one of the earliest pioneer locations of the American movie industry. Its rolling hills and relatively arid landscape were ideal to make more than 100 Westerns.
Today, La Mesa has a population of more than 57,000. The city is a mix of quaint downtown villages, surrounding businesses and residential areas. To support these areas, the...
