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WASTE DISCHARGE REQUIREMENTS -4- <br /> JOHNS-MANVILLE MANUFACTURING COMPANY, INCORPORATED <br /> FORMOSA PLASTICS, USA <br /> SAN JOAQUIN COUNTY <br /> known activity associated with this fault occurred in 1881, producing a magnitude 5 + <br /> earthquake (Richter scale). This is considered to be the maximum probable earthquake <br /> for this site. <br /> SITE DESCRIPTION <br /> 16. Land within 1000 feet of the facility is used for industrial and agricultural purposes. <br /> 17. The facility is within the 100-year flood plain where flood depths are between one and <br /> three feet. <br /> 18. Groundwater levels are encountered at 18 to 47 feet below ground surface. The <br /> variances in elevations are possibly due to the presence of more than one water-bearing <br /> zone. The flow is to the east-northeast, with a gradient of 0.1 - 0.2%. A perched zone <br /> might exist in the area south of the surface impoundments. <br /> 19. The beneficial uses of ground water are domestic, municipal, agricultural and industrial <br /> supply. <br /> 20. The facility receives an average of 14.17 inches of precipitation per year, as measured at <br /> the Stockton Airport (data US Weather Service, 1949 - 1980). The annual evaporation <br /> is approximately 67.4 inches per year. <br /> 21. The 100 year, 24 hour precipitation is approximately 2.8 inches. <br /> 22. Surface drainage is west-southwest to North Littlejohn Creek, tributary to French Camp <br /> Slough which flows into the San Joaquin River. <br /> 23. Beneficial uses of surface water are domestic, municipal, agricultural, and industrial <br /> supply; recreation; esthetic enjoyment; fresh water replenishment; and preservation and <br /> enhancement of fish, wildlife and other aquatic resources. <br /> OPERATION AND DESIGN OF FACHITIES <br /> 24. The Discharger ceased A/C pipe production in July, 1987. The Discharger still <br /> produces PVC pipe at the facility, but the process is a completely closed system where <br /> all of the water is recycled and no process wastewater is generated. Currently, the only <br /> wastes discharged to surface impoundments are water from an air compressor after- <br /> cooler and condensation water from the office air conditioning system. <br />