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UPDATE 30 11-11-94 <br /> 40 SITE ACTIVITIES <br /> WEGE personnel visited and/or monitored the site on August 17, <br /> and 31, September 19, October 10, and 12 , and November 7, 1994 <br /> During the August 17 , 31, October 12, and November 7, 1994 visits <br /> the vapor extraction system (VES) was sampled and the results <br /> were used to update the Fate Modeling presented with this report, <br /> see Appendix A The scheduled October 10, 1994 site visit <br /> obtained quarterly ground water samples as requested in the <br /> August 29, 1994 SJCPHS letter These samples were chain of <br /> custody delivered to American Environmental Network, Inc (AEN) <br /> for analysis using EPA method 5030/8020, TPHg/BTEX. Laboratory <br /> results indicated the absence of gasoline range hydrocarbons and <br /> BTEX' s in the ground water with the exception of MW5 (being used <br /> for vapor extraction) which contained 0 . 1 mg/L gasoline range <br /> hydrocarbons and 2 ug/L Xylenes The vapor stream contained only <br /> minor gasoline range hydrocarbons and Xylenes at 0 .4 mg/L and 6 <br /> ug/L respectively, see Tables 1 and 3 and Appendix B - Laboratory <br /> Reports and Field Notes <br /> RESULTS - WATER <br /> GROUND WATER GRADIENT <br /> The ground water gradient maps have been produced from <br /> measurements obtained on August 17, October 12 , and November 7 , <br /> 1994 , see Figures 4A, 42 and 4C <br /> Figure 4A, August 17 , 1994 depth to water measurements were <br /> obtained with the vacuum system on These measurements indicate <br /> a discharge to the area, with a basin forming at MWS, due in part <br /> to vapor extraction removal of water vapor <br /> Figure 4B, October 12 , 1994 depth to water measurements were also <br /> obtained with the vacuum system on These measurements show a <br /> potentiometric low valley forming from MW3 towards MW5 (the area <br /> of greatest vacuum influence) Overall depth to water <br /> measurements indicate that ground water discharge is still <br /> occurring to the area <br /> Figure 4C, November 7, 1994 depth to water measurements were also <br /> obtained with the vacuum system on These measurements show a <br /> potentiometr.ic high at vapor extraction well MW5 Overall depth <br /> to water measurements indicate that ground water discharge is <br /> still occurring with flow direction (gradient) to the east, see <br /> Table 2 and Appendix B <br /> TOTAL PETROLEUM HYDROCARBONS <br /> Float.inProduct - <br /> No floating product has ever been observed an any of the <br /> monitoring wells or borings at this site <br /> page2 <br />