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Working To Restore Nature preserved under chain-of-custody documentation Three to four soil samples from each ' well/boring were submitted for analysis Sample selection was based upon previous analytical data and field observations Analytical results are summarized in Table 1 Laboratory reports are presented in Appendix D ' 5.3 Installation of Groundwater Monitoring Wells Groundwater was encountered at approximately 69 feet below grade The wells were constructed of 4-inch diameter F480 PVC 020 slot screen and 4-inch diameter F480 PVC casing The wells were screened between approximately 65 and 85 feet below surface grade RMC Lonestar No 3 sand was utilized for a filter pack Two feet of bentonite was placed above the filter pack prior to sealing the wells with neat cement A water-tight locking cap was placed on each well casing and a water-tight wellbox was concreted over the top of the well Well construction details are included in Appendix C ' Subsequent to well completion, the wellheads were surveyed and tied to a common arbitrary datum estimated from the United States Geological Survey 7.5 minute Escalon Quadrangle Map The wells were then monitored for free product and depth to water readings were collected The wellhead survey data and groundwater monitoring data are presented in Table 2 Surveying and ' monitoring field notes are presented in Appendix E 5.4 Installation of Vapor Extraction Wells Vapor Extraction wells were constructed of 4-inch diameter F480 PVC 0 020 slot screen and ' 4-inch diameter F480 PVC casing The wells were screened between 20 and 50 feet below surface grade RMC Lonestar No 3 sand was utilized for a filter pack Two feet of bentonite was placed above the filter pack prior to sealing the well with neat cement. A water-tight locking cap was placed on each well casing and a water-tight wellbox was concreted over the top of the well Vapor well construction details are included in Appendix C 150047M-031594 FNL 6