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01 November 2002 <br /> • AGE-NC Prod ect No 01-0865 <br />' Page 5 of 6 <br /> • TPH-g was detected at a maximum concentration of 4,000 mg/kg (MW6-5) <br />' BTEX was detected at a maximum concentration of 34mg/kg, 310 mg/kg, 110 mg/kg and <br /> 720 mg/kg, respectively(MW6-5) <br />' The fuel oxygenates MTBE and TAME were detected at maximum concentrations of <br /> 56 mg/kg (EPA Method 8260B) and 2 2 mg/kg In sample MW6-5 TBA was detected at a <br />' concentration of 0 30 mg/kg in soil sample MW7-5 <br /> • Petroleum hydrocarbon-Impacted soil appears to be concentrated in the peat layer that <br />' extends from surface grade to approximately 12 feet bsg <br /> • No target analytes were detected in soil sample MW6 at 60 feet bsg, and BTEX and MTBE <br /> concentrations of In soil samples MW6 at 55 feet bsg and MW6 at 50 feet bsg were at orjust <br />' above laboratory detection limits,based on this Investigation and previous site assessments, <br /> the vertical extent of soil contamination has been defined <br />' No target analytes were detected in soil samples collected from borings MW8 and MW10, <br /> and only a low concentration of MTBE detected in sample MW5-14, based on this <br /> Investigation and previous site assessments,the lateral extent of soil contamination has been <br />' defined to the east and the north and generally defined to the south and west <br />' 5.0. RECOMMENDATIONS <br /> Based on the findings of the environmental activities recounted in this report, AGE recommends <br /> • Continuation of the quarterly monitoring program, the next monitoring event should be <br /> performed In December 2002 <br /> 1 • _Monitoring well MW 1 at the top of the levee has been damaged and is currently unusable, <br /> it should be properly abandoned and replaced with another well at the former USTs location <br /> to help refine the hydraulic gradient and delineate the western extent of petroleum <br /> hydrocarbons-Impacted ground water <br /> • 'Conducting a ground water pumping test as approved by the CVRWQCB by letter dated <br />' 25 September 2002, the test has been scheduled for mid-November 2002 <br /> 6.0. LIMITATIONS <br /> l <br />' Our professional services were performed using that degree of care and skill ordinarily exercised by <br /> • environmental consultants practicing in this or similar localities The findings were based upon <br /> Advanced GcoEnvironmental,Inc <br /> 1 <br />