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systems serve mobile home parks, schools, institutions, service <br /> stations, food facilities, apartment buildings, and other public <br /> buildings which have 5 or more service connections or serve at least <br /> 25 people 60 days per year. These systems are classified as Small <br /> Community Water Systems, Non-Community Water Systems, and State Small <br /> Water Systems. <br /> While all water systems are monitored for bacterial and chemical <br /> contaminants, small community water systems are sampled for radiologi - <br /> cal contaminants as well . <br /> After reviewing the sample analysis results of water from existing <br /> water systems for a number of years, the Local Health District is <br /> currently modifying the well ordinance for both public and private <br /> well installation. <br /> Permits and inspections have been required on all water. wells con- <br /> structed since 1972. However, special considerations had to be made <br /> for wells constructed in areas of the County where state maximum <br /> contaminant levels have been exceeded. This may necessitate <br /> (1) placing deeper grout seals on wells, (2) providing increased <br /> surface protection on wells, (3) preventing cross connections (connec- <br /> tion between a potable and non-potable water source) , or (4) increas- <br /> ing distance requirements between water wells and sources of contami - <br /> nation. <br /> Additionally, monitoring wells have been placed in areas to monitor <br /> the ground-water quality at or near points of contamination. Monitor- <br /> ing wells are used to identify plumes of contamination and provide <br /> valuable information for contamination cleanup. <br /> The Small Water System Evaluation Program (AB 1803) requires small <br /> water systems that use ground water as a drinking water source to test <br /> for ground-water contamination. The program uses a four step process <br /> to accomplish its goals: <br /> PJ9 9390502E.00D 13-6 Rev. 1 11/09/88 <br />