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J Site Assessment Report fir ' <br /> Former Texaco Service Station <br /> Chevron Site ID 309075 <br /> March 18, 2010 <br /> V <br /> Frequency Range of California Concentration <br /> of Detected Primary Frequency of of <br /> Constituent Detection Concentrations MCLS Exceedances Exceedances <br /> Above <br /> the MDL' (Ng/L)2 (Ng/L) (Ng/L) by Well <br /> TPH-DRO 2/2 62— 170 -- -- -- <br /> TPH-DRO 1/2 80 -- -- <br /> "" w/Silica gel -- <br /> TPH-MO 1/2 350 -- -- -- <br /> TPH-MO 2/2 86-230 <br /> w/Silica gel -- <br /> Toluene 1/2 2 150 -- -- <br /> Ethylbenzene 1/2 0.7 300 -- -- <br /> Total Xylenes 1/2 2 1,750 -- -- <br /> Notes: <br /> 1. MDL=method detection limit. <br /> 2. pg/L=microgram per liter,equivalent to part per billion(ppb). <br /> 3. MCL=maximum contaminant level. <br /> rr <br /> TPH-MO was detected in groundwater samples collected from MW-6D screened by 8015B. <br /> TPH-MO was detected in both monitoring wells (MW-6 and MW-6D) screened by 8015B with <br /> silica gel clean-up. <br /> Toluene, ethylbenzene and total xylenes were detected above the respective method detection <br /> limit (MDL), but not above MCLs, in groundwater samples collected from monitoring well <br /> MW-613. Concentrations are generally consistent with previous results from other monitoring <br /> wells in the monitoring well network. <br /> Concentrations of TPH-GRO, benzene, MTBE, methanol, ethanol, TBA, DIPE, ETBE, TAME, <br /> 1,2-DCA, and EDB were not detected above the laboratory MDL in groundwater samples <br /> collected from MW-6 and MW-6D. <br /> 1.r <br /> 4.3 SITE CONCEPTUAL MODEL <br /> There are no site conceptual model (SCM) updates. Historical and current analytical soil and <br /> groundwater data and well construction details are presented as Tables 1, 2 3, and 4. <br /> Groundwater gradient and flow direction data is included as Attachment D. Information <br /> regarding the collection of soil samples associated with the removal of the UST and analytical <br /> data for the samples collected from monitoring well MW-1 is not available. <br /> �1 <br /> \\CA5FP\Data\Aproject\ENV\CHEVROM309075\6 Deliverables\Reports\DG Wells Assessment\Assessment Report_4741010950.doc 7 <br />