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2.3 Litholo is Description of Soil • During installation of the borings, one boring will be geologically logged continuously from 35 feet bgs to the maximum depth of the boring (anticipated to be 60 feet bgs) The samples will be described using standard geological classifications of color, texture, mineral content, etc , and classified according to the Unified Soil Classification System 2.4 Groundwater Sampling Although all prior groundwater sampling conducted at the site has shown groundwater to be free of detectable concentrations of hydrocarbon parameters, there apparently still needs to be further confirmation of groundwater quality near the former tank location Since there is no evidence of groundwater impacts that would suggest the need for long-term future monitoring, monitor wells are not necessary Instead, the need for a final confirmation of groundwater quality can be accomplished by a one-time sampling of appropriate locations with a Hydropunch' A Hydropunch is a stainless steel sampling tool that is capable of collecting a representative groundwater sample from an aquifer without the installation of a groundwater monitor well 1 Because of the uncertainty in groundwater flow directions shown in the site data taken in 19$7 and the regional data available from 1993, WESTON proposes to sample groundwater from both ' the northeast and south sides of the former tank excavation Currently existing wells MW-2 and MW-3 will be used for this purpose The procedure, discussed in more detail in Section 3 2 2, involves extending the internal bore of the existing well casing approximately 10 feet to the current groundwater depth and retrieving a groundwater sample with the Hydropunch tool This procedure is designed to acquire a one- ' time-only sample of roundwater to make a final. determination if roundwater has been impacte in eit er otentia down irection tram the former tank location ' 3.0 SAMPLING AND SAMPLE ANALYSIS PROCEDURES This section details the sampling and analytical protocol to be utilized in the collection and analysis of soil and groundwater samples for the site ' 3.1 General Requirements and Documentation All work will be conducted under the supervision of a California Registered Geologist A hard ' bound field log book will be kept for the project by the sampling crew chief All data relating to the collection of samples and related field activities will be recorded in the log book Samples collected will be documented in the log book by the sample ID number, location, time, date, and ' sampler's initials Any observations regarding the sampling process and field related activities or the surrounding environment which may affect the sampling quality will be noted in the log book Each page of the log book will be dated along with the logger's initials and the project ' name Any deviations from the sampling protocol or approved work plan will be entered in the log book 5 oro9roa ' M\kFTC15JCMVCDWP