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eoogic Associates <br /> Geologists,Mydrogeologists and Engineers <br /> t <br /> October 12,2007 <br /> Job No. 2006-06� <br /> Forward Landfill, Inc. (An Allied Waste Company) / <br /> Forward Sanitary Landfill <br /> 9999 S. Austin Road � ® <br /> 01> <br /> Manteca, California 95336 ' <br /> Attention: Mr. Lochlin Caffey <br /> FIRST YEAR MOISTURE MONITORING PERFORMANCE REPORT <br /> NORTH SLOPE—STAGE 1A PARTIAL FINAL CLOSURE <br /> FORWARD SANITARY LANDFILL,SAN JOAQUIN COUNTY, CALIFORNIA <br /> 1.0 INTRODUCTION <br /> GeoLo is Associates GLA is leased to submit this first annual moisture monitoring <br /> g (GLA) p <br /> performance report for Stage 1 A.of the partial final closure of the Forward Sanitary Landfill <br /> (FSL) in San Joaquin County, California. This report has been prepared for Forward Landfill, <br /> Inc. (FLI) as a part of the requirements of the Workplan for Moisture Monitoring of the Forward <br /> Sanitary Landfill(the Workplan, GLA, 2005). As recommended in the Workplan,this system <br /> performance review and an annual report is being submitted to the Regional Water Quality <br /> Control Board—Central Valley Region(RWQCB) and the San Joaquin County Local <br /> Enforcement Agency (LEA) for their evaluation of the performance of the alternative final cover <br /> system at the landfill. <br /> This report includes data from the final cover moisture monitoring demonstration program <br /> established for the FSL Stage I alternative cover system. As presented in the Workplan, <br /> monitoring of soil moisture content was to be conducted at two locations for a period of two <br /> years. As presented and agreed to by agencies,the locations of the two monitoring stations are <br /> shown on Figure 1. Monitoring for this program began on July 28 2006, and this report <br /> incorporates data from initial monitoring through the end of July,2007 <br /> 1.1 BACKGROUND <br /> State and Federal regulations (Title 27 CCR, Section 21090 and Title 40 CFR, Subpart F, <br /> Section 258.60) require that closed landfills construct a prescriptive final cover system <br /> that incorporates a two foot thick foundation layer, a one foot thick low-hydraulic <br /> conductivity layer, and a one foot thick erosion resistant layer. As part of the prescriptive <br /> final cover system,the low-hydraulic conductivity layer must exhibit a saturated <br /> hydraulic conductivity of less than 1x10-6 cm/sec, or equal to the hydraulic conductivity <br /> of the bottom liner system or underlying natural geologic materials. <br /> 1 <br /> 250 W. First Street, Suite 228, Claremont, California 91711 Phone: (909) 626-2282 FAX: (909) 6R6-1233 <br />