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C A M B R I A Mr Jeffrey Wong • February 15, 2006 excavation was performed and additional soil samples were collected One soil sample collected from the excavation sidewall at 14 feet below grade (fbg) contained 380 parts per million (ppm) total purgeable petroleum hydrocarbons as gasoline (TPHg) Two soil samples collected at depths of 4 5 and 6 fbg from the dispenser island areas contained 1,600 and 1,700 ppm TPHg Complete results of the UST removal are documented in the Fugro West, Inc April 19, 1995 Underground Storage Tank Closure Report 1996 Site Investigation During February 1996, Enviros, Inc (Enviros) drilled 10 soil borings in the vicinity of the UST complex and the dispenser islands TPHg was detected in three of the borings at concentrations up to 770 ppm Benzene was detected in one boring at concentrations ranging from 0 0082 to 0 026 ppm Methyl tertiary butyl ether (MTBE) was detected in four of the borings at concentrations up to 15 ppm Enviros' May 21, 1996 Soil Boring Installation Report details this investigation 1999 Well Installation During September 1999, Cambria installed one groundwater monitoring well (MW-1) Soil samples from well boring MW-I contained 0 0208 ppm MTBE No TPHg, benzene, toluene, ethylbenzene, and xylenes (BTEX), fuel oxygenates other then MTBE, or lead scavengers were detected in soil from this boring Cambria's December 21, 1999 Site Investigation/Fourth Quarter 1999 Groundwater Monitoring Report further describes this investigation 2001 Piping Replacement During March 2001, the site's product piping was removed and replaced Cambria collected eight soil samples beneath the piping Six of the samples contained TPHg up to 220 ppm Benzene was detected in three of the soil samples at concentrations up to 0 066 ppm MTBE was detected (by EPA Method 8260B) in all soil samples at concentrations ranging from 0 015 to 0 42 ppm Tertiary amyl methyl ether (TAME) and tertiary butanol (TBA) were also detected in some of the soil samples at low concentrations These activities are summarized in Cambria's August 1, 2001 Soil Sampling and Piping Removal Report 2001 Well Installation During November 2001, Cambria drilled one cone penetration test (CPT) boring (CPT-1) and installed three groundwater monitoring wells (MW-2, MW-3, and MW-4) Soil samples from the well borings did not contain detectable TPHg, BTEX, or MTBE concentrations Soil samples from the CPT boring contained MTBE (up to 3 7 ppm) at depths up to 50 fbg No MTBE was detected in deeper soil samples, and no TPHg or benzene was detected in soil samples from this boring Cambria's February 13, 2002 Fourth Quarter 2001 Groundwater Monitoring/Site Investigation Report and Receptor Survey documents this • investigation 1 2