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• <br /> $NTH <br /> conducted by a State-licensed (C57) drilling company. A field geologist will be present to log <br /> all drill cuttings and soil samples. Descriptions of soil types encountered, sample collection <br /> intervals, and well construction details will be recorded on boring/well logs and included in the <br /> PSA report. Soil samples will be collected at five foot intervals and selected samples will be <br /> submitted for laboratory analysis of TPHg and BTEX. <br /> All drill cuttings will be placed in 55-gallon drums approved for hazardous waste storage and <br /> stored on-site pending laboratory results. Selected soil samples will be sent using chain-of- <br /> custody record to a State-certified laboratory for,analysis of TPHg and BTEX by EPA methods <br /> 8015/8020, respectively. The borings will be completed as groundwater monitoring wells. The <br /> monitoring wells will be constructed of 2-inch inside diameter PVC well screen and casing. A <br /> 0.010-inch well screen slot and #2/12 mesh sand pack will be used. Neat cement will be used <br /> to seal the wells in accordance with California Well Standards (December 1981). To protect the <br /> integrity of the wells, locking, water-tight well plugs will be installed on each well and a water- <br /> tight, locking wellhead labeled "monitoring well" will be concreted over each well. Based on <br /> the historical depth to groundwater in the area near the site, the wells are proposed to be <br /> constructed as shown on Figure 3. <br /> Task 3 - Well Surveying, Monitoring, Development, and Sampling <br /> The top of the new wellheads will be surveyed and tied together. Measurement of depth to <br /> Lwater in the wells will be completed to evaluate the direction and magnitude of the groundwater <br /> gradient beneath the site. The new wells will be developed using surge and bail techniques until <br /> the produced water is relatively sediment free. Prior to the collection of groundwater samples, <br /> a minimum of three well volumes (casing and sandpack) will be purged. Temperature, pH, <br /> water elevation, and electric conductivity will be measured and allowed to stabilize. Water <br /> { samples will be collected using disposable bailers, one dedicated to each well. Groundwater <br /> L samples collected from all monitoring wells will be submitted using chain-of-custody record to <br /> a State-certified laboratory for analysis of TPHg and BTEX using EPA methods 8015/8020, <br /> 951 MREPORTSIWP-0495.FNL 3 <br />