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S E C 0 R Conceptual Site Model Chevron Service Station #9-6171 March 25, 2005 Page 19 benzene ranging from 9 1 pg/[- to 1,900 pg/L, toluene ranging from 3 3 pg/L to 2,700 µg/L, ethylbenzene ranging from below method detection limits to 150 pg/L, total xylenes ranging from 65 pg/L to 3,000 pg/L, and MtBE ranging from 12 pg/L to 170 pg/L I In November 2001, Cambria installed monitoring wells MW-10 and MW-11 Monitoring wells MW-8 and MW-9 could not be Installed at their proposed locations due to the presence of utilities Concentrations of TPHg, BTEX, and MtBE were not reported above the method detection limits In either of these groundwater monitoring wells In August 2002, Cambria Installed groundwater monitoring wells MW-8 and MW-9 in a location across Pacific Avenue from the subject site Concentrations of TPHg, BTEX, and MtBE were not reported above the method detection limits in either of these groundwater monitoring wells I6.3 Canepa's Carwash — 6230 Pacific Avenue This site consists of an automated car wash, fuel station, and a convenience store It is located across Pacific Avenue from the Shell Station and has been operating continuously in that location for over 20 years In the spring of 1993, three USTs, fuel lines, and fuel dispensers were removed and replaced with a double-walled UST system The USTs consisted of two 12,000-gallon capacity gasoline tanks and one 5,000-gallon capacity diesel tank When the tanks were removed, contaminate soil was discovered The causes of the contamination were leaking fuel lines and overfilling of the USTs Approximately 600 cubic yards (yd3) of soil were removed from the excavation area and properly disposed In September 1993, WHF Environmental (WHF) collected 16 soil samples during excavation of the USTs Laboratory results of the soil samples indicated that TPHg concentrations range from less than 15 mg/kg to 3,800 mg/kg and BTEX concentrations ranged from 26 mg/kg to 560,000 mg/kg Based on these results, one soil boring (B-1) was advanced Analyses of the soil samples show TPHg concentrations ranged from below the method detection limits to 5,200 mg/kg Concentrations of BTEX ranged from below the method detection limits to 190,000 gg/kg, 800,000 pg/kg, 750,000 pg/kg, and 940,000 pg/kg, respectively Laboratory results reported that there is no TPHd present In I conjunction with soil boring, nine soil vapor extraction (SVE)wells were Installed In the area of the fuel dispenser islands There were no samples collected during the SVE well installation However, the WHF consultant responsible for drilling those wells reported that I "field observations supported gasoline contamination" In September 1993 and March 1994, eight groundwater monitoring wells (MW-1 through MW-8) were installed Groundwater samples collected from the newly-Installed wells were analyzed for TPHg, BTEX and TCE Laboratory results reported there was no TCE present in the system Concentrations of TPHg ranged from below the method detection limits to 93 I ' N IFdes\Projects\Chevron\Retadl#9-61711Site Conceptual Model\FINAL_CSM doc