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' will continue until at least 6-I0 casing volumes in excess of any water added during <br /> drilling activities have been removed, and monitored parameters have stabilized. Water <br /> level measurements will be collected from all wells including the piezometers a <br /> ' minimum of 72 hours after piezometer development activities are completed. <br /> A.fi Laboratory Analyses <br /> ' All water samples selected for analysis will be transported in a cooler containing ice,under <br /> proper chain-of-custody protocol, to a California-certified mobile and fixed-base <br /> ' laboratory. Selected water samples will be analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg) using Environmental Protection Agency (EPA) modified Method 8015 <br /> and benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl ether <br /> ' (MTBE) using EPA Method 8020. If MTBE is detected, the sample with the highest <br /> MTBE concentration will be reanalyzed for MTBE only at a fixed-site laboratory using <br /> EPA method 8260A. <br /> ' Quality assurance/quality control (QA/QC) samples will be collected and <br /> submitted to a separate State-certified fixed laboratory as follows- <br /> ' • At two depths,one shallow and one deep,duplicates will be collected, <br /> • Each cooler containing groundwater samples will contain a trip blank and <br /> temperature blank;and <br /> • One equipment rinseate blank for each day of field work will be collected <br /> ' A.7 Management of Investigation Derived Waste Material <br /> Concrete, asphalt and soil cuttings removed during drilling activities and liquid <br /> ' generated during decontamination of the sampling equipment and development of the <br /> piezometers will be containerized in 55-gallon drums and stored on site pending <br /> characterization for off-site disposal at an appropriate facility At a minimum, each <br /> drum will be labeled with the site address,boring/piezometer number,type material,date <br /> of accumulation and depth interval,if applicable. When possible, suspected unimpacted <br /> material will be containerized separate from known impacted material. <br /> • <br /> Our reL Page <br /> ' WM_&Wri_8ARSARAICATAIAPRQ 5$OWHOCALIC VA11EYWVP5_REVIPACVN7=oC 12/11 <br /> ARCADIS GERAGHTY&MILLER <br />