SOLID WASTE

Phase 1A, 1B, 1C & 2B Liner Systems
Lancaster Landfill & Recycling Center
Lancaster, Los Angeles County, California

10-acre Phase 1A consisted of a level base surrounded by 2:1 cut slopes varying in height from 60 to 80 feet. The liner system is a single-composite liner system comprising the following components, from bottom to top:

BASE LINER SYSTEM: Prepared subgrade, Geosynthetic clay liner (GCL), 60-mil HDPE geomembrane (double-sided textured), 12 oz/yd2 Geotextile, 12-inch thick gravel layer, 8 oz/yd2 Geotextile, and 2-foot thick operations layer.

SIDE-SLOPE LINER SYSTEM: Prepared subgrade, GCL, 60-mil HDPE geomembrane (singlesided textured), 16 oz/yd2 cushion geotextile, and 2-foot thick drainage/operations layer (initially placed 11 ft up the slope from the bench).


Installation of single-sided
60-mil HDPE over GCL

10-acre Phase 1B, 11.3-acre Phase 1C, and 10-acre Phase 2B consisted of a level base with a 2:1 cut slopes on the east side and on the east and south sides of the landfill, respectively; varying in height from 40 to 50 feet. The liner system is a single-composite liner system comprising the following components, from bottom to top.

BASE LINER SYSTEM: Prepared subgrade, Geosynthetic clay liner (GCL), 60-mil HDPE geomembrane (double-sided textured), 12 oz/yd2 cushion geotextile, 12-inch thick leachate collection and recovery system (LCRS) gravel, 8 oz/yd2 filter geotextile, and 12-inch thick protective cover soil (PCS).

SIDE-SLOPE LINER SYSTEM: Prepared subgrade, GCL, 60-mil HDPE geomembrane (singlesided textured), 16 oz/yd2 cushion geotextile, and 18-inch thick PCS (measured in the vertical direction).

Note: Phase 1A, 1B and 1C final CQA reports were submitted to the Regional Water Quality Control Board (RWQCB), Lahontan Region, to certify that Phase 1A, 1B, 1C and 2B were constructed and completed in general accordance with the plans and specifications, and Title 27 of the California Code of Regulations.
250 Goddard, Irvine, CA 92618    Phone: (949) 777-1266   Fax: (949) 777-1276   Email: hai@hushmand-associates.com