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IC- VV A S S O C I A T E S i N C 2,.5 Soil Sampling and Analysis The soil samples from boring MW4 were collected at five-foot intervals using a 2-inch diameter split-spoon sampler containing three brass tubes. The cored samples and drill cuttings were characterized for soil type, moisture content, and visual evidence of petroleum hydrocarbons. An FID was used as a field screening device for the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples. Drill cuttings were temporarily stored on site in 55-gallon DOT approved steel drums. ' Selected _ soil samples were kept on ice and delivered under chain-of-custody documentation to ' Argon Laboratories for chemical analysis. Selected soil samples were analyzed by Argon for TPHg, TPHd, TPHss, BTEX, and oxygenate fuel additives. The analytical results for soil samples are summarized in Table 1. Laboratory data sheets and chain-of-custody documentation ' are included in Appendix C. 2.6 Groundwater Monitoring Well Construction Soil boring MW4 was completed as a groundwater monitoring well to assess groundwater beneath the site, and to provide measurement points for the determination of groundwater flow direction and hydraulic gradient. The well was surveyed on April 11, 2000 and tied into the existing groundwater monitoring wells. Survey data is contained in Table 3. ' The well was constructed with 2-inch PVC casing to approximately 38 feet bgs. The screened interval of the well was positioned from approximately 5 feet above to 15 feet below the encountered water table to allow for seasonal water level fluctuations. The screen slot size is 0.020-inch. Well construction details are depicted on the well log contained in Appendix A. ' 2.7 Monitoring Well Development Groundwater monitoring well MW4 was developed on April 10, 2000. The well was purged until the extracted water was relatively sediment free. The development log is included in Appendix D. Purgewater was temporarily stored on site in 55-gallon drums. ' 2.8 Groundwater Sampling and Analysis On April 10, 2000, a groundwater sample as collected from well MW4. Fluid levels were taken on April 11, 2000 from wells MW1 MW2, MW3, and MW4 utilizing an electronic water probe capable of measuring with an accuracy of 11100 of a foot. Groundwater elevation data are presented in Table 3. The sample was collected after purging a minimum of three well volumes ' and stabilization of electric conductivity, pH, and temperature. Field purge logs are presented in Appendix D. Subsequent to purging, groundwater was sampled and transferred to appropriate sample containers, using a clean, disposable bailer with a bottom emptying device to reduce volatilization. w:1172951reportslsumiii.doc 4