ARCHIVED REPORTS_2008_26 - Laserfiche WebLink

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INFORMATION SHEET FORWARD INC.,FORWARD LANDFILL SAN JOAQUIN COUNTY Forward,Inc. owns and operates a waste management facility on Austin Road, seven miles southeast of the City of Stockton. The south fork of Littlejohns Creek traverses the southern portion of the 157- acre site. There are 23 existing or proposed waste management units (WMUs) at the facility. Order No. 94-014 classified landfill WMU D-93 and all future units in W i'VIUs D and H as Class H landfills. These waste discharge requirements approve the use of a geosynthetic clay liner(GCL) in place of two feet of compacted clay in the composite liner system for both landfill and surface impoundment waste management units.For landfills units, the GCL design is typically used for those portions of side-slope liners that overlap older landfill units while compacted clay is used for the base liners.The GCL is overlain by a 60 mil HDPE geosynthetic liner,followed by a geocomposite drainage net, and a 1-foot thick protective operations layer.For surface impoundments,the double liner design will use a lower composite liner system with a GCL and geomembrane liner overlain by a drainage layer and an upper geomembrane. The Discharger made the demonstrations required by Section 2510(b) and (c)of Chapter 15 to use the alternative liner design.The Discharger demonstrated that the engineered alternative is consistent with the performance goal of the prescriptive standard and affords equivalent protection against water quality impairment and that the prescriptive standard is unreasonable,unnecessarily burdensome and will cost substantially more. Active WMUs at the facility include Class III landfalls, a Class H landfill, one interim Class II surface impoundment for landfill leachat, a Class II landfill dedicated to coal ash disposal, and a soil remediation pad. Inactive units include three Class III landfill WMUs with interim cover, one Class H land treatment unit for petroleum contaminated soils which was clean closed, and one Class I landfill (WMU A, formerly a Class U-1 unit) closed under a closure plan approved by USEPA,DISC and the Board. The older Class III landfill units are lined with four feet of compacted clay. These units are designed so that a portion of their volume is isolated from acidic landfill leachate. This allows for disposal of waste such as contaminated soil which is not a'designated waste'based on results of a Waste Extraction Test using deionized water,rather than the standard citrate buffer SER