Laserfiche WebLink
March 16, 1988 <br />l <br />Roberts Oil Company <br />Page a <br />that underlying ground water within the immediate vicinity of the transfer <br />block is contaminated, and that migration of gasoline constituents and <br />hydrocarbons down the prevailing hydraulic gradient from the transfer block <br />area has not occured. <br />J.H. Kleinfelder followed up their 1985 assessment in April of 1987 by <br />collecting ground water quality samples from the existing ground water <br />quality monitoring network onsite. Samples were collected from all <br />preexisting wells, with the exception of well MW -1, which could not be <br />located by J.H. Kleinfelder & Associates sampling personnel. The samples <br />collected were analyzed for volatile aromatics and total petroleum <br />hydrocarbons, in accordance with USEPA standard methods. The analytical <br />results indicated that no gasoline constituents or petroleum hydrocarbons <br />were detected, within the analytical detection limits, in the ground water <br />quality samples submitted. J.W. Kleinfelder & Associates concluded that <br />based on the sampling effort, contaminated ground water originating from <br />the transfer block would not be detected by the present ground water quality <br />monitoring network. Recommendations by J.H. Kleinfelder & Associates were <br />presented to Roberts Oil Company, for the installation of additional ground <br />water quality monitoring wells, and the drilling and sampling of soil <br />boreholes, at the facility. <br />The results of the assessments conducted by J.H. Kleinfelder & Associates to <br />date indicate soil contamination is limited to the soil profile underlying the <br />eastern portion of the above ground storage tank farm, and the area east of <br />the tank farm, between the transfer block and the loading area. Likewise, <br />ground water quality contamination is limited to the same area onsite. The <br />prevailing natural hydraulic gradient appears to trend northwest to <br />southeast beneath the site. However, this is based on ground water elevation <br />measurements taken from the existing ground water quality monitoring <br />network, which is possibly to widely spaced to allow for such a <br />determination. Floating product has been observed only in MW -1. Use of the <br />existing ground water quality monitoring network for monitoring the <br />migration of a contaminant plume emanating from the transfer block/loading <br />