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t b. Ground Water -- Preliminary test indicates that the groundwater table occurs from 65 feet during the fall and winter season and 60 feet during the spring and summer months. Mineral analyses conducted on other wells in East Stockton and their location is attached to this report as Appendix B. 6. Climate a. The following seasonal average statistics prevail: AVERAGE MONTH MIN. MEAN. MAX. RAIN January 37.0 44.7 52.4 2.92 inches April 46.5 59.7 72.8 1.08 " July 60.9 78.2 95.4 ---- October 50.2 64.0 77.7 .64 " Yearly 48.4 61.3 74.2 14.11 b. Climate Conditions Affecting Air Quality -- Central San Joaquin County is in line with the Carquinez Strait windbreak. During the summer months, the air flows east from the oecean and splits in a northerly direction towards Lodi, and southerly towards Modesto, gathering particles of dust from the ground as it moves south. During the winter months, the pattern is reversed; however, there is less particulate matter brought north in the winter than what is carried south in the summer. Clear cool nights in the early winter and late autumn precipitant fogs which can last for days if stagnant atmospheric conditions persist. The San Joaquin Valley, with a high number of sunshine hours, seasonal inversions and frequent absence of wind has the potential for a high magnitude of air pollution. c. Air Quality in San Joaquin County -- California has been geographically divided into 12 air basins, and local air pollution control districts have been formed within these areas. The San Joaquin County Air Pollution Control District encompasses the entire County, which is at the northwestern edge of the San Joaquin Valley Air Basin. The district is responsible for regulating stationary pollution sources and monitoring pollutant levels. Vehicle emissions are regulated by the State. Increased growth can be expected to aggravate an air pollution problem which already exists in the Stockton area. The inversion layer which is one -5-