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11C8I_ VV <br /> A S S O C I A T E S I N C <br /> fuel additives utilizing EPA 8260 methodology. The analytical results for soil samples are <br /> summarized in Table 1. Laboratory data sheets and chain-of-custody documentation are included <br /> 1 in Appendix C. <br /> 2_3 Groundwater Monitoring Well Construction <br />' Soil boring MW1 was subsequently completed as groundwater monitoring well to assess <br />' potentially impacted groundwater beneath the site. <br /> The well was constructed with 2-inch PVC casing to a depth of 23 feet bgs. The screened <br />' interval of the well was positioned from approximately 5 feet above to 10 feet below the <br /> encountered water table to allow for seasonal water level fluctuations. The screen slot size is <br /> 0.020-inch. The well was secured with a traffic rated utility box and a paddle lock. Well <br /> construction details are depicted on the well log contained in Appendix B. <br /> 2.4 Monitoring Well Development <br /> 1 Groundwater monitoring well MW1 was developed on February Y26, 1999. The well was purged <br /> until the extracted water was relatively sediment free. Development/purge logs are included in <br /> MAppendix D. Purge water was temporarily stored on site in 55-gallon drums. After fluid levels <br /> had been allowed to stabilize, groundwater level was obtained from MW L Fluid levels were <br /> taken on February 26, 1999, utilizing an electronic water probe capable of measuring with an <br />' accuracy of 11100 of a foot. Groundwater elevation data are presented in Table 2. <br /> 2.5 Groundwater Samplina and Analysis <br /> On February 26, 1999, groundwater samples were collected from well MWL The samples were <br /> collected after purging a minimum of three well volumes and stabilization of electric <br /> conductivity, pH, and temperature. Field development/purge logs are presented in Appendix D. <br /> Subsequent to purging, groundwater was sampled and transferred to appropriate sample <br /> containers, using a clean, disposable bailer with a bottom-emptying device to reduce <br /> volatilization. Sample containers were then labeled with sample identification, placed on ice, <br /> and shipped under chain-of-custody to Sequoia Analytical. <br />' The groundwater samples from well MW1 were analyzed by Sequoia Analytical for TPHg, <br /> BTEX, and oxygenate fuel additives. Groundwater analytical results are summarized in Table 3, <br />' and laboratory data sheets are presented in Appendix E. <br />' 3.0 SUBSURFACE CONDITIONS <br /> 3.1 GeojM <br /> w A 172921repoaslsumwel.doc 3 <br />