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q { <br /> Cumulative FP Recovered to Date NIA <br /> Current Remediation Techniques SVE/Air Bubbling (SVE system down since <br /> 11/24/97 due to low TPHG concentrations in sod <br /> vapor) <br /> Approximate Depth to Groundwater 39 93 to 42 16 <br /> Groundwater Flow Direction Northeast <br /> Groundwater Gradient 0 001 ft/ft <br /> SVE QUARTERLY OPERATION AND PERFORMANCE <br /> Equipment Inventory Airex Katox Catalytic Oxidizer 100-scfm <br /> Operating Mode Catalytic <br /> SJVUAPCD Permit No N-3218-1-0 <br /> Total Petroleum Hydrocarbons (TPH) SVE system down since 11124/97 due to low <br /> Conc End of Period (lab) TPHG concentrations in soil vapor_ <br /> Benzene Conc End of Period (lab) NA <br /> Flow Rate End of Period NA <br /> Applied Vacuum This Period NA <br /> HC Destroyed This Period (lab) NA <br /> Utility Usage (electrical/gas/propane) NA <br /> Operating Hours This Period NA <br /> Percent Time Operational NA <br /> Number of Auto Shutdowns NA <br /> CURRENT SOURCE (BEFORE DILUTION) INFLUENT SUMMARY (LAB) <br /> Total Petroleum Hydrocarbons as <br /> Gasoline (TPHG) Conc This Period SVE system down since 11/24/97 due to low TPHG <br /> concentrations in soil vapor and equipment failure <br /> TPHG Conc Last Period NA <br /> Initial TPHG Conc 9,900 m /m3 November 9, 1994[following system upgrade]) <br /> Benzene Conc This Period NA <br /> Benzene Conc Last Period NA <br /> Initial Benzene Concentration 290 mg/m3 November 9, 1994 (followino system u rade <br /> DISCUSSION <br /> Results of this monitoring event indicate that concentrations of dissolved gasoline hydrocarbons in wells <br /> MW-1 through MW-7, and MW-10 are generally consistent with levels detected to previous sampling <br /> events In well MW-2 TPHG, benzene, ethylbenzene, and MTBE concentrations increased to 4,820 <br /> micrograms per liter (µg/I), 764 µg/l, 375 µ.g/I, and 191 µg/I, respectively MTBE was confirmed In well <br /> MW-2 at a concentration of 5 6 µg11 using USEPA Method 8260 The groundwater gradient and direction <br /> of groundwater flow (northeast) were generally consistent with previous data The groundwater elevation <br /> decreased approximately 4 56 feet from the previous sampling event (.tune 1999) <br /> CP\E\ARC0121301QTRLY12130Q299 DOC-9811sg 1 �Cott2�iC� <br />