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Stantec
<br /> UST and Line Removal Report
<br /> ARCO Service Station No. 6080
<br /> March 15, 2011
<br /> Baker tank on-site awaiting transport for disposal. Stantec was unable to obtain information
<br /> related to the total volume of water removed during the fueling facility upgrade.
<br /> 2.3 DISPENSER, PRODUCT-LINE, AND USTS REMOVAL ACTIVITIES
<br /> In December 2010, three existing double-walled 12,000-gallon fiberglass USTs, fuel dispensers,
<br /> product lines, and associated piping were removed by Gettler Ryan as part of the gasoline
<br /> station upgrade activities. A total of 900 gallons of non-hazardous tank rinsate water was
<br /> transported by Nieto and Sons Trucking, Inc. to DeMenno Kerdoon in Compton, California for
<br /> treatment and disposal. The three fiberglass USTs were hauled under manifest and disposed of
<br /> off-site at the Republic Services Vasco Road Landfill in Livermore, California. Stantec was
<br /> unable to obtain copies of the UST disposal manifest. The new USTs were installed in a new
<br /> tank pit that was extended south of the existing tank pit (Figure 2). Mr. Muniappa Naidu of the
<br /> SJCEHD observed the UST removal and directed the soil and groundwater sample collection
<br /> activities. The USTs were subsequently replaced by one 10,000-gallon, one 12,000-gallon, and
<br /> one 20,000-gallon fiberglass USTs. Field notes detailing the UST and fuel system removal
<br /> activities are included in Appendix A.
<br /> 2.4 DISPENSER AND PRODUCT-LINE SOIL SAMPLE COLLECTION
<br /> On December 8, 2010, Stantec's field geologist collected a total of four soil samples beneath
<br /> the fuel dispensers (D-1-3.5, D-2-3.5, D-3-2.5, and D-4-3) and 13 soil samples beneath the
<br /> product lines (P-1-2.5, P-2-3, P-3-3.5, P-4-2, P-5-2, P-6-2, P-7-2.5, P-8-2, P-9-3, P-10-2.5, P-
<br /> 11-3, P-12-2, and P-13-2). All soil samples were collected under the direct supervision of Mr.
<br /> Muniappa Naidu of the SJCEHD. Each soil sample was screened for hydrocarbon vapors using
<br /> a portable photo-ionization detector (PID). Dispenser and product line soil samples were
<br /> collected in clean, two-inch diameter by six-inch long stainless steel sample liners that were
<br /> driven approximately two feet into the native soil.
<br /> The dispenser and product line soil samples collected for analysis were retained in the stainless
<br /> steel liners, labeled, and capped with Teflon° sheets and plastic end caps. The samples were
<br /> then sealed in a zip-lock bag, placed on ice, and transported to Calscience Environmental
<br /> Laboratories, Inc. (Calscience) of Garden Grove, California, accompanied by the appropriate
<br /> chain-of-custody (COC) documentation. The soil samples were analyzed for gasoline range
<br /> organics (GRO) and methanol by Environmental Protection Agency (EPA) Method 8015B (M),
<br /> benzene, toluene, ethylbenzene, total xylenes (collectively BTEX), methyl tert-butyl ether
<br /> (MTBE), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME),
<br /> tert-butyl alcohol (TBA), 1,2-dibromoethane (EDB), 1,2-dichloroethane (1,2-DCA), and ethanol
<br /> by EPA Method 8260B.
<br /> Field notes detailing the dispenser and product-line sample collection activities are included in
<br /> Appendix A and the soil sample locations are shown on Figure 2.
<br /> 2.5 UST EXCAVATION SOIL SAMPLE COLLECTION
<br /> On December 13, 2010, Stantec's field geologist collected a total of 10 soil samples from the
<br /> UST excavation floor (T87-A-12, T87-B-12, T-87-C-12, T89-A-12, T89-B-12, T89-C-12, T91-A-
<br /> 12, T91-B-12, T91-C-12, and V-1-3). All soil samples were collected under the direct
<br /> 6080 UST and Line Removal Report.doc 2
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