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WASTE DISCHARGE REQUIREMENTS -2- <br /> CLOSURE AND POST CLOSURE MAINTENANCE OF <br /> CORRAL HOLLOW SANITARY LANDFILL <br /> CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> solid waste' and 'inert waste' using the criteria set forth in Chapter 15. The <br /> discharge rate is about 1800 cubic yards (or 331 tons) per day. <br /> DESCRIPTION OF SITE <br /> 5. Land within 1,000 feet of the site is primarily used for pasture land with a small <br /> amount of agriculture. <br /> 6. The climate in the area is typical of that in the Sacramento Valley. Summers are hot <br /> and dry, and winters are mild and wet, with the most precipitation in the months from <br /> November to March. <br /> 7. There are several faults in the area of the landfill. These include the Tesla Fault, the <br /> Livermore Fault, and the Calaveras Fault. The fault that would most likely be the <br /> source of the maximum probable earthquake (WE) is the Calaveras Fault. The MPE <br /> for,this fault was calculated by Kleinfelder & Associates in a report called "Geologic <br /> Investigation, Foothill Sanitary Landfill, San Joaquin County, March 1988". The <br /> value of the MPE was given as 7.0 on the Richter scale. This would produce a <br /> maximum average peak horizontal ground acceleration of 0.20g. <br /> 8. There are three distinct alluvial units underlying the site. The upper unit immediately <br /> underlying the landfill consists of semi-consolidated sand-gravel mixtures from 1 to <br /> 10 feet thick. Underlying these is the Corcoran Clay which is approximately 50 feet <br /> thick beneath the east side of the site, and thins rapidly and pinches out-near the <br /> westernedge of the site. The lowest unit is a clay-sand matrix supported gravel <br /> which is at least 200 feet-thick. <br /> 9. The ground water monitoring reports show a ground water mound underneath the <br /> landfill with the ground water gradient in the shallow aquifer indicating bi-directional <br /> flow to the northwest and southeast. The monitoring wells in the deep aquifer were <br /> dry in 1991, 1992, and 1993. The aquifers are separated by the Corcoran Clay <br /> member of the Tulare Formation. Depth to ground water is approximately 70 feet in <br /> the shallow aquifer and 320 feet in the deep aquifer. <br /> 10. The ground water monitoring network detected a release of wastes to ground water in <br /> 1991. Since 1991, pollutants found in ground water include: trichlorofluoromethane <br /> (Freon 11), tetrachloroethane (PCE), dichlorodifluoromethane (Freon 12), and <br /> methylene chloride. Ground water samples from wells MW-4 and MW-5 exhibit <br />