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UTORNE <br /> ENVIRONMENTAL <br /> as groundwater monitoring wells that will yield information on groundwater gradient and <br /> quality. Additionally, these wells can be used as VES extraction/inlet wells. <br /> The borings will be completed inch <br /> dltheebottom of the wells monitoring <br /> 15 feetwells <br /> below <br /> open slotted liner from 5 feet below grade to <br /> grade. Well construction will comply with standard RCRA requirements. <br /> Task 3 - Laboratory Analysis <br /> We anticipate collecting 45 feet of continuously cored soil sample. Each core will be <br /> visually inspected and screened using an organic vapor monitor. Sample lithology will <br /> be described by an experienced environmental geologist, under the direct supervision bf <br /> a California Registered Geologist, and recorded on field boring logs. Six selected soil <br /> samples will be labelled, capped, recorded on a Chain of Custody document and stored <br /> at four degrees centigrade or less. Soil samples will be analyzed for halogenated and <br /> aromatic volatile organics along with total petroleum hydt-ocarbons as gasoline, diesel, <br /> kerosene, motor oil, paint thinner, and MBA's (surfactants) using EPA methods 8240 and <br /> 8270. We anticipate analyzing three water samples which will be analyzed for the same <br /> chemical compounds as the soil samples using the EPA methods analysis 624 and 625. <br /> Task 4 - Monitor Groundwater Elevations <br /> The locations and elevations of the three proposed monitoring wells along with the three <br /> existing wells will be surveyed. The elevation of groundwater will then be monitored in <br /> the wells to assess any tidal effects on elevation, gradient, and gradient direction. <br /> Task 5 - VES Feasibility Study <br /> Thorne Environmental will conduct a vapor extraction system feasibility study at the site. <br /> The proposed monitoring wells will be constructed to be used as vapor extraction/inlet <br /> wells. The objective of the study is to assess the ability of the organic vapors to be <br /> extracted from the vadose zone. Tedlar bag vapor samples will be collected to assess <br /> the concentration and chemical components of the vapor. Finally, vapor pressure will <br /> be measured to estimate the radius of influence for each well and correct blower sizing. <br /> Task 6 - Report of Findings <br /> A report of findings will be prepared for submittal to the Central Valley Regional Water <br /> Quality Control Board which details field activities, sampling procedures, analytical <br /> results, data analysis, recommendations, and conclusions. <br /> 11/89 Y89-199 <br />