Laserfiche WebLink
Frontier Transportation B23502.01A <br /> January 2, 1996 Page 8 <br /> (U.S.G.S.) benchmark or to an assumed reference elevation (datum). The survey data will <br /> be used to calculate groundwater gradient and flow direction consistent with Twinings <br /> SOPS. <br /> 4.1.4 Groundwater Sampling: Groundwater sampling of the monitoring wells will be <br /> conducted a minimum of 24 hours following development. The monitoring wells will be <br /> sampled consistent with procedures outlined in the SOPS. The groundwater sample <br /> analytical results are expected to provide data on the groundwater quality (i.e., PPC <br /> concentrations) and the extent of PPC migration in groundwater. . This data may also be <br /> used to evaluate potential remediation methods. Groundwater sample analyses and <br /> analytical methods to be used for this characterization are summarized in section 4.2 <br /> Laboratory Testing Program, <br /> 4.1.5 Soil Cuttings, Decontamination Rinsate, and Purge Water Disposition: Soil <br /> cuttings from the hand auger borings, drilled borings, monitoring well boreholes, rinsate <br /> from the decontamination of drill tools, and sampling purge water will be containerized in <br /> United States Department of Transportation (DOT)-approved 55-gallon drums, labeled, and <br /> _ stored on site. The disposition of the soil cuttings, rinsate, and purge water will be <br /> determined based on the soil and groundwater sample analytical results. The report for this <br /> site characterization will include a recommended method and time frame for disposal of the <br /> soil cuttings, rinsate, and purge water. However, disposal of the soil cuttings, rinsate, and <br /> purge water will be the responsibility of the client. <br /> 4.2 Laboratory Testing Program : Soil samples will be selected for chemical analysis <br /> based on SJCPHS assessment criteria and previously collected data. Benzene, toluene, <br /> ethylbenzene, xylenes (BTEX), total petroleum hydrocarbons - gasoline range (TPH-G) and <br /> total petroleum hydrocarbons - diesel range (TPH-D) will be used in the laboratory testing <br /> program as indicator parameters for soil samples collected from hand angered soil borings <br /> assessing the extent of PPC migration beneath the former dispenser island and product <br /> piping. BTEX and TPH-G will be used in the laboratory testing program as indicator <br /> parameters for soil samples collected from drilled soil borings and monitoring well boreholes <br /> assessing the extent of PPC migration in the vicinity of the former gasoline USTs. BTEX <br /> and TPH-G will also be used in laboratory testing of groundwater samples collected from <br /> monitoring wells MW- 1 through MW-3 . Proposed preparation and analytical methods for <br /> the laboratory analyses are summarized in Table 4. <br />