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o � <br /> J. H. KLEINFELDER & ASSOCIATES <br /> File: S-1008-21/12 : 337 <br /> Revised: July 8 , 1986 <br /> Page 7 <br /> The above compatibility rating does not consider <br /> absorption/adsorption of contaminants onto or into the PVC <br /> polymer matrix and the potential for leading solvents and certain <br /> heavy metals from the PVC into the ground water samples. These <br /> concerns have been raised and documented to occur under <br /> laboratory conditions, but to date, there are few data <br /> documenting these effects in the field. It is the dominant <br /> consensus that under low organic contamination conditions, <br /> sufficient purging and proper sampling and decontamination <br /> procedures should eliminate the introduction of sample bias. <br /> The potential contaminant of concern at the Harney Lane <br /> Landfill is typical non-hazardous landfill leachate; <br /> characterized by high-dissolved solids and slightly acidic <br /> conditions . Monitoring over the last four years at the site <br /> appears to substantiate a Regional Board conclusion that the <br /> probability of the landfill causing degradation of the ground <br /> water is relatively remote. None of the wells used for <br /> monitoring have shown any indication of ground water degradation. <br /> In addition, there is no reason at this time to suspect the <br /> presence of any hazardous organic contaminates in the waste which <br /> would justify concern for the use of PVC as a monitoring well <br /> material . Therefore, the monitoring well at these facilities <br /> will employ PVC casing. <br /> WATER QUALITY SAMPLING <br /> Cross contamination of samples can occur if proper equipment <br /> techniques and procedures are not followed, particularly when a <br /> single pump is used. therefore, to prevent potential <br /> contamination of samples and to facilitate collection of water <br /> samples on a long term basis, it is proposed that electric <br /> submersible pumps be installed in the wells. There are a number <br /> of economically available pumps for dedicated installation. The <br /> pump diameter should be in the 3- to 4-inch range and be capable <br /> of a minimum 6 gal/min flow from 100 feet. A dedicated pump, <br /> such as a Brainard/Kilman TriLoc Float Pump, a QED Well Wizard, <br /> or equivalent, should be used. Actual pump selection will be <br /> made during the monitoring well installation phase. The pumps <br /> can be set up for direct on-demand electrical connection or <br /> equipped with plug fixtures for use with a portable electric <br /> generator. - - <br />