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' k4 KLEINFELDER 2 MONITORING WELL SAMPLING ' Plate 1 presents the location of the Overhead/Lodi Door Corporation Facility, Lodi, California. The locations of the monitoring wells are shown on Plate 2. Three monitoring wells (MW-1, MW-2, MW-3) were sampled ' on April 20, 1987 using an ISCO air-operated bladder pump with stainless steel casing, silicone rubber bladder, and Teflon sample lines. Prior to ' sampling, the wells were purged and pH, electrical conductivity (EC), and temperature of the discharged ground water were measured and recorded. ' Sampling was conducted after the field measurements stabilized. Unfiltered and non-preserved samples were collected for analyses of major ' ions and standard parameters. A 0.45 micron polyproplyene filter was installed on the Teflon discharge line prior to collection of preserved samples for metals analyses. A new filter was used prior to sampling each ' monitoring well. Purge characteristics are shown on Table 1. The ISCO pump, sampling lines, and associated equipment were rigorously steam cleaned between wells. At least 5 gallons of hot water were pumped through the sampling assembly before sampling each well. Samples were collected in appropriate containers supplied by the contract laboratory. ' Select samples were preserved by adding 5 ml of concentrated nitric acid Per quart of sample. Other samples did not require the addition of preservatives. Samples were labeled, placed in cooled ice chests, and delivered under chain-of-custody procedures to the laboratory. The date, sampler's name, job number, and sample identification number were recorded of the chain-of-custody documents are on each sample label. Copies attached with the lab results and may be found in Appendix A. Quality assurance (QA) procedures included the collection of: o One field blank (composed of distilled water) o Three blind duplicate samples (one from each monitoring well) ' o One blind triplicate sample (from MW-1) 57-87-621 2