Laserfiche WebLink
<br /> <br />Foothill Sanitary Landfill Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring ©2025 County of San Joaquin. All rights reserved. <br /> <br />i <br />Table of Contents ____________________________________ <br />1.0 INTRODUCTION ................................................................................................................. 1 <br />1.1 General ...................................................................................................................... 1 <br />1.2 Hydrogeology ............................................................................................................ 1 <br />1.3 Construction .............................................................................................................. 1 <br />2.0 COMPLIANCE HISTORY SUMMARY................................................................................ 3 <br />2.1 History ....................................................................................................................... 3 <br />2.2 Impermeable Barrier Placement – Potential Impact to Groundwater ........................ 6 <br />3.0 MONITORING PROGRAM ................................................................................................. 8 <br />3.1 Groundwater .............................................................................................................. 8 <br />3.2 Surface Water ........................................................................................................... 9 <br />3.3 Leachate .................................................................................................................... 9 <br />4.0 UNSATURATED ZONE MONITORING ............................................................................ 12 <br />4.1 Soil-Pore Gas .......................................................................................................... 12 <br />4.2 Lysimeters ............................................................................................................... 12 <br />5.0 WATER QUALITY PROTECTION STANDARD ............................................................... 13 <br />5.1 Constituents of Concern .......................................................................................... 13 <br />5.2 Concentration Limits ................................................................................................ 13 <br />5.3 Monitoring Points ..................................................................................................... 13 <br />5.4 Point of Compliance ................................................................................................ 13 <br />5.5 Compliance Period .................................................................................................. 13 <br />6.0 MONITORING RESULTS ................................................................................................. 14 <br />6.1 Statistical Analysis ................................................................................................... 14 <br />6.2 Groundwater ............................................................................................................ 14 <br />6.3 Surface Water ......................................................................................................... 16 <br />6.4 Leachate .................................................................................................................. 17 <br />6.5 Vadose Zone Soil Gas ............................................................................................ 17 <br />6.6 Lysimeters ............................................................................................................... 17 <br />7.0 GROUNDWATER DIRECTION AND FLOW RATE ......................................................... 18 <br />8.0 STANDARD OBSERVATIONS ........................................................................................ 19 <br />9.0 RUN-OFF/RUN-ON FACILITIES ...................................................................................... 20 <br />10.0 OTHER ANALYSES ......................................................................................................... 21 <br />11.0 5-YEAR TOPOGRAPHIC SURVEY ................................................................................. 22 <br />12.0 LEACHATE COLLECTION AND RECOVERY SYSTEM - PROCEDURES AND <br />MAINTENANCE ................................................................................................................ 23 <br />12.1 Facilities ............................................................................................................... 23 <br />12.2 Disposal: Return of Leachate to the Refuse ........................................................ 23