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Sampling of monitoring wells occurred no less than 24 hours following well <br /> development AGS collected ground water samples from each monitoring well after <br /> I ' purging between three and five well volumes of ground water from each well During <br /> purging, ground water quality parameters were monitored and recorded on the <br /> appropriate well sampling forms Wells were purged until water quality stabilization <br /> occurred Stabilization was determined to have been reached when two consecutive <br /> temperature, pH, and conductivity readings do not vary by more than 10% Purged well <br /> water was containerized and stored on-site in metal 55 gallon drums pending analytical <br /> results <br /> ' The pump, hose, and electrical leads were decontaminated before and between each well <br /> purging by washing the exterior with a solution of laboratory grade detergent and <br /> pumping the solution through the pump and hose The exterior of the pump, hose, and <br /> ' electrical leads were rinsed with potable water and potable water was pumped through the <br /> pump and hose <br /> ' After purging, sampling of each well was conducted using new, clean, dedicated <br /> disposable polyethylene bailers Distilled water was poured into each bailer and a bailer <br /> blank was collected prior to well sampling The bailers were then lowered into the wells <br /> ' via dedicated poly cords to collect ground water samples The samples were gently <br /> poured into two 40 ml VOA vials Each VOA vial was immediately sealed, checked for <br /> headspace, labeled with the date, time and location and placed in a cooler containing blue <br /> ice at 4° Celsius The samples were transported under strict chain-of-custody protocol to <br /> GeoAnalytical Laboratories in Modesto, California for analysis Appendix B contains <br /> analytical data and chain-of-custody forms <br /> 3.2.3 Laboratory Analysis of Soil Samples <br /> ' Soil samples collected for laboratory analysis were stored in a cooler chilled to 4° Celsius <br /> and shipped under strict chain of custody protocol to the analytical laboratory The <br /> ' samples were analyzed in Modesto, California by GeoAnalytical Laboratories, a <br /> California State certified analytical laboratory for the following constituents <br /> • TPH - gasoline, Method 5030/LUFT <br /> detection lima 1 0 mg/Kg <br /> • Benzene, Toluene, Ethyl Benzene and Total Xylenes (BTEX), EPA Method 8020 <br /> ' detection limits 5 0 µg/Kg <br /> American Geological Services Inc <br /> 5� g <br />�i CA95DE-029 <br /> 8 <br />