ARCHIVED REPORTS XR0008945 - Laserfiche WebLink

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C A M B R I A 0 2002 Aquifer Punip Test During October 2002, Cambria performed an extended aquifer pump test extracting 4,248 5 gallons of groundwater from MW-4 over a 5-day period Based on the extracted volume and sample analytical results, approximately 3 33 pounds of MTBE were removed Complete results from the aquifer pump test are documented in Cambria's December 13, 2002 Aquifer Pump Test Report 2003 Soil Vapor Extraction (SVE) Test- During September 2003, Cambria installed three SVE wells (SVE-1, SVE-2, and SVE-3) During October 2003, Cambria performed a 5-day SVE test using these wells During this test, approximately 2 68 pounds of TPHg and 1 42 pounds of MTBE were removed Due to low influent concentrations, which indicate that there is insignificant impact to the source area, Cambria does not recommend additional SVE Cambria documents this test in our November 14, 2003 Soil Vapor Extraction Test Report 2003 Well Installation During July 2003, Cambria installed three offsite wells (MW-8, MW-9, and MW-10) and one deep onsite well (MW-11) No TPHg, BTEX, or fuel oxygenates were detected in soil from well borings MW-8, MW-9, or MW-10, although the samples were analyzed outside of hold time Soil samples were not collected from well boring MW-11 because • it is located near MW-1 These results complete lateral definition of petroleum hydrocarbons and fuel oxygenates in soil at this site Cambria describes this investigation in our December 3, 2003 Site Investigation/Third Quarter Groundwater Monitoring Report and Site Conceptual Model Groundwater Monitoring Program There are currently eight monitoring wells (MW-1 through MW-7 and MW-11) and two piezometers (P-1 and P-2) located onsite and three offsite wells (MW-8, MW-9, and MW-10), which are sampled quarterly During the second quarter 2004 sampling event, MTBE was detected in wells MW-1, MW-3 through MW-5, MW-7, P-1, and P-2 at concentrations ranging from 4 3 to 6,700 ppb TBA was detected in wells MW-1 through MW-4, P-1, and P-2 at concentrations ranging from 79 to 240,000 ppb MTBE and TBA were not detected in groundwater from wells MW-6, MW-8, MW-9, or MW-10 No other fuel oxygenates were detected TPHg and BTEX sample analyses were not conducted during this event These constituents are typically not detected at elevated reporting limits INTERIM REMEDIATION The objective of interim remediation was to implement periodic batch groundwater extraction (GWE) to remove fuel oxygenate mass from groundwater beneath the site Batch GWE events • 0955 4