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i STANDARD OBSERVATIONS Regular site inspections were performed during the first semester of 2008. Monthly standard observations � P have been summarized (Appendix H). The electronic signatures on the forms certify that all observations were performed and are accurate. RUN-OFF/RUN-ON FACILITIES The Foothill Sanitary Landfill utilizes several methods to control run-on and run-off. The natural topography of the area controls any run-on into the site. Also, the working area is a significant distance from ithe property boundary, so run-on from surrounding properties is minimal. To control run-off, a perimeter ditch along the north, west and east ends of the unit directs all storm water run-off into a sedimentation basin on the east side of the site. The rest of the run-off from the unit gathers into a sedimentation basin at the southeast corner of Module 1. There were no breeches to any of the run- on/run-off facilities during this monitoring period. OTHER ANALYSIS Groundwater samples were collected from landfill supply well LW-1 and analyzed for all monitoring and field parameters. The well is not a point of compliance, as stated in the WDRs. LEACHATE COLLECTION AND RECOVERY SYSTEM - PROCEDURES & MAINTENANCE iFacilities The leachate collection and recovery system (LCRS) for Module I was designed in accordance with Title 27, Section 20340(g). This system consists of: ■ East/west oriented collection troughs running the entire length of Module 1 ■ A 4-foot deep sump at the southeast corner of the Module ■ A leachate removal pump installed in anl8-inch diameter HDPE pipe ■ A 2-foot deep secondary extraction trench beneath the primary composite liner, with 12-inch HDPE riser pipe ■ A pumping system that allows recording of leachate flows and volumes ■ A 10,000 gallon leachate storage tank Pumping Procedures iLeachate drains by gravity to the Module 1 sump, from which it is pumped to the 10,000-gallon storage tank by the pump installed in the sump. The pump operates automatically, based on leachate level within the sump. Control points for the pump are: Pump Off. 12" Pump On: 36" Alarm:48" i Foothill Sanitary Landfill 10 Department of Public Works/Solid Waste 15`Semester 2008 Groundwater Monitoring County of San Joaquin—July 31,2008