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k'g KLEINFELDER Total petroleum hydrocarbons as referenced to gasoline (TPH-G) was detected in the groundwater sample collected from temporary well EB-1/TW-1 at a concentration of 62.4 µg/1. UEHs were reported at 0.130 mg/1 and 0.262 mg/l, respectively, from groundwater samples collected from temporary wells TW-1/EB-1 and TW-2/EB-2. No other analytes were detected in the two groundwater samples at or above laboratory reporting limits. The UEHs found in groundwater may be a result of cross contamination. It is Kleinfelder's opinion that the TPH-G found in groundwater is likely the result of an unknown offsite source. Two sets of blanks were submitted for analyses during construction of the two temporary wells. The field and trip blanks submitted for analyses during sampling of groundwater from temporary well EB-2/TW-2 did not contain any detectable concentration of the requested analyses. However, toluene was detected in the field and trip blank collected during the groundwater sampling of TW-1/EB-1 at 0.709 µg/1 and 0.654 µg/l, respectively. Toluene, was not detected in any of the soil or groundwater samples submitted for analyses. Because toluene was not detected in either soils or groundwater during our assessment, it is unlikely that the toluene was a result of contamination originating from the project site. Although blank water is periodically checked at the analytical laboratory prior to use, it is Kleinfelder's experience that blank water from the laboratory may on rare occasions be contaminated, depending on the blank waters source or potential contaminants in the lab. Toluene is a common constituent in wide variety of applications including adhesives, solvents, dyes, detergents, gums, lacquers, resins etc.. Based on the results of this assessment, Kleinfelder has detailed several conclusions and recommendations on the handling of soil and groundwater during construction of the site. Those recommendations and others are detailed in Chapter 7 of this report. This report is subject to the limitations found in Chapter 8 of this report. 20-3712-08.E01/2018R510 Page 2 of 16 © 1998,Kleinfelder, Inc. July 9, 1998