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Soil cuttings generated during the drilling process will <br /> also be screened for the presence of volatile organics using <br /> the above methods. <br /> Soil samples submitted for analysis will be selected based <br /> on lithologic observations and obvious signs of <br /> contamination ( i. e. PID readings, odors , and/or soil <br /> discoloration) . At a minimum, the sample collected <br /> immediately above the water table will be submitted for <br /> laboratory analysis. <br /> Samples will be collected, preserved, and transported under <br /> chain-of-custody in accordance with WaterWork ' s Quality <br /> Assurance/Quality Control ( QA/QC ) Plan (Appendix II ) . <br /> Select samples will be analyzed for benzene, toluene, <br /> ethylbenzene, and xylenes ( BTEX ) and total petroleum <br /> hydrocarbons as gasoline (TPHG) by appropriate FT and DHS <br /> methods. Sequoia Analytical (CA certification No. 145 ' ill <br /> perform the analyses. <br /> Soil cuttings will be placed on and covered with 6 mil <br /> plastic on-site. Somal cuttings and groundwater will be <br /> properly disposed of in a timely and appropriate manner <br /> after reviewing the analytical results and obtaining agency <br /> approval. The storage area will be posted with a sign <br /> indicating the source and contents of each pile or drum. <br /> Groundwater will be monitored in accordance with WaterWork ' s <br /> QA/QC Plan. A survey mark tied to a common datum will be <br /> established on each wellhead for determining groundwater <br /> gradient direction. Surveying will be performed under the <br /> direct supervision of a California Registered Civil <br /> Engineer. Groundwater contours will be constructed using a <br /> kriging program. <br /> Subsequent- to installation and well development , water <br /> samples will be collected from the monitoring well after <br /> purging a minimum of four well volumes (casing and sandpack) <br /> from each well. Stabilization of EC, pH, and temperature <br /> will be checked after purging and before and after sample <br /> collection to ensure samples collected are representative of <br /> formation water. The purged water w3.11 remain on-smote, in <br /> secured 55-gallon drums, until laboratory results are <br /> received. A proposal for treatment or disposal of the water <br /> produced during development will then be prepared. Water <br /> sample collection and preservation will be in accordance <br /> with WaterWork's QA/QC Plan. Bailers with bottom emptying <br /> devices to reduce volatilization will be used. The water <br /> samples will be analyzed by Sequoia Analytical for BTEX and <br /> TPHG by appropriate EPA and DHS methodologies. <br /> During well development/purging, drawdowns will be monitored <br /> in order to estimate formation transmissivity. This data <br /> will be used along with the lmthologic descriptions to <br /> assess contaminant pathways and velocities. <br /> 4 <br />