4128 RUCKER AVE SAFEWAY FUEL STATION 2016-01-01 MF Import

1.7s. Shartnan BraN, Sateway Inc. EPI Pro�ect No. 082tB3.� August S. 20�2 Monitoring wells sampled solely by EPI (i.e. A1W-10, MW-2, and Unknownt) were purged and sampled using a peristaltic pump to minimize sample volatilization and silt uptake. Dedicated tubing was used in each well and ground water was pumped directly into appropriate sample containers at a flow rate of less than 100 milliliters/minute. Monitoring wells sampled by both AMEC and EPI were purged by AMEC using a submersible electric pump and sampled using disposabie bailers. Immediately upon collection, ground water samples were labeled and phced in an iced cooler pending submittal to the analytical laboretory. All samples were transported w:Je- standard chain-of-cusbdy protocols to CC� Analytical Laboratories, Inc. (Everett, WA) for analysis. Each ground water sample was suGmitted for analysis of: • Gasoline-range petroleum hydrocarbons (GRPH), • Diesel-range pelroleum hydrocarbons (DRPH), • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), • Methyl tertiary butyl ether (MTBE), and • Dissolved lead. In addition, the ground water samples from ihree of the wells (i.e., MW-2, MW-5, and MW-7) were also analyzedfor: . Volalile Organic Compounds (VOCs), including 1,2 Dichloroethane (EDC), • Other fuel addilives, including 1,2 Dibromoethane (EDB), methanol, ethanol, tert-butanol, tertiary amyl butyl ether (TAME), and ethyl tertiary butyl ether (ETBEj. The requesled analyses for ground water samples are presented in Table 1. Ground Water Sample Petroleum Hydrocarbon Analytical Results GRPH were detected in samples (rom MW-5, MW-7, and UnKnown-1. Detected concentrations ranged (rom GO micrograms/Liter (�ig/L) to 68,000 Fig/L. The detected GRPH concentrations in M\N-7 and Unknown-1 exceeded the Model Toxics Control Act (MTCA) Method A Ground Water Cleanup Level of 800 F�c�/L. Laboratory analytical results are summarized in Tables 2 and 3. The distribution of detected GRPH concentrations is mdicated on Figure 3. At Ieast one o( the BTEX compounds was detected in three of the ground water samples. Benzene �vas detected above the MTCA Method A Ground Water Cleanup Level of 5 pg/L in MW-5 (i.e. 36 ug/L) and Unknown-t (i.e. 380 pg/L). The method deteclion limit (MDL) (or benzene exceeded the cleanup level in A1W-7 due to lhe high GRPH concentralions. Toluene was delected above lhe MTCA Method A C N V I R O N M f N i A l I` p µ T N C M1 1 I N c Page 2