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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2009-0049 -7- <br /> SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br /> HARNEY LANE LANDFILL <br /> SAN JOAQUIN COUNTY <br /> 34. Carbon dioxide in LFG can cause elevated bicarbonate in groundwater. Also, since <br /> LFG can migrate in all directions, including vertically and upgradient, it can affect <br /> upgradient wells close to the landfill. Given the possibly elevated concentrations of <br /> bicarbonate alkalinity detected in MW-1 and the well's close proximity to the landfill, it <br /> cannot be assumed that this well has not been impacted by LFG. MW-1 may <br /> therefore not be suitable as a background monitoring well for monitoring parameters <br /> that can be affected by LFG, such as alkalinity, TDS and specific conductance. To <br /> resolve this issue, Provision G.5 of these WDRs requires that the Discharger <br /> establish a background monitoring well a sufficient distance from the landfill to be <br /> outside of the influence of LFG and any potential landfill leachate impacts (i.e., either <br /> by installation of a new well or by utilization of an existing monitoring well of suitable <br /> construction). <br /> 35. The following groundwater water quality criteria for constituents of concern (CDCs) <br /> have been exceeded at this site: <br /> Conslit-uent WQ-Obis i-ve- Concentration <br /> VOCs (pg/L): WQ Limit Detected <br /> Benzene Chemical Constituents 1.0' 1.3 <br /> Toxicity 0.152 <br /> 1,2-Dichloropropane ToXicity 0.502 0.7 <br /> PCE Toxicity 0.062 1.4 <br /> General Minerals (mg/Q: <br /> Chloride Chemical Constituents 1063 120 <br /> Chemical Constituents 4503 <br /> TDS 5004 510 <br /> Taste & Odor 5004 <br /> 1. California Primary MCL <br /> 2. California Public Health Goal <br /> 3. Agricultural Goal <br /> 4. California Secondary MCL <br /> CLOSURE AND CORRECTIVE ACTION <br /> 36. Previous WDRs Order No. 93-093 required that the Discharger close the landfill in <br /> accordance with Chapter 15 regulations and an approved Final Closure Plan (FCP). <br /> Landfill closure was also required as a corrective action measure to address <br /> groundwater impacts from the landfill (see Finding 30). The FCP included the <br /> following documents (all prepared by George S. Nolte and Associates): <br /> • May 1986 Closure Plan, Harney Lane Landfill <br /> • January 1992 Harney Lane Sanitary Landfill Final Closure Plan <br /> • April 1-9T4--Harney Lane Sanitary Landfill-Final Closure Construction Plans <br /> . I <br />