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Blass EnvironInenta/Management Inc U-Haul 704-50 <br /> ' 002-70950 04 Groundwater Momtonng Report <br /> 09/09/02 <br /> Analytical results of groundwater samples collected from the "C" casing wells, screened between <br /> ' approximately 60 and 100 feet bgs, revealed the highest concentration of hydrocarbons to be located <br /> around wells MW-4C and MW-7C All other "C" casing wells reported hydrocarbon concentrations <br /> below 1,000 gg/L TPHg, or concentrations below laboratory detection limits The approximate extent of <br /> ' hydrocarbon contamination in groundwater associated with "C" casing wells is shown in Figures 7 and 8 <br /> The laboratory analysis of groundwater samples for fuel additives (MTBE, TBA, DIPE, ETBE, and <br /> TAME)yielded concentrations below laboratory reporting limits <br /> 1 <br /> Analytical results of the groundwater sample collected from well MW-2C (analyzed by EPA Method <br /> ' 8260 full list) indicated detections of BTEX, 1,2-dichloro ethane, and 1,2,4-trimethylbenzene Refer to <br /> the analytical report included in Appendix D for details ' <br /> 3 4 PURGE WATER TREATMENT AND DISPOSAL <br /> ' Purged groundwater generated during groundwater sampling activities at the site is stored in a 1,000- <br /> gallon poly tank on the west side of the U-Haul building Prior to conducting purging activities during <br /> the June 2002 sampling event, Blaes Environmental contracted Integrated Wastestream Management, <br /> Inc for the removal, transport, and treatment of purge water generated during the March 2002 <br /> groundwater sampling event Approximately 1,000 gallons of purge water was transported from the site <br /> and treated at the Seaport Environmental treatment facility in Redwood City, California A copy of the <br /> ' certificate of disposal is included in Appendix E <br /> 1 � <br /> 1 <br /> 8 <br />