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Former Beacon Station No 12419 October 9,2001 <br /> wrrw <br /> Davis, California The samples were analyzed for total petroleum hydrocarbons as gasoline <br /> i (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes <br /> (BTEX), and the fuel oxygenate methyl-tert-butyl ether (MTBE) by Environmental Protection <br /> Agency (EPA) Method 8260B <br /> Groundwater Monitoring Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate groundwater elevations Groundwater elevation data were used to construct a <br /> groundwater contour map as shown on Figure 2 <br /> Analytical results are summarized in Table I Benzene concentration data from this sampling <br /> event were used to construct a benzene isoconcentration map as shown on Figure 3 Copies <br /> of the laboratory data sheets and chain-of-custody documents are included as Attachment C <br /> Recommendations <br /> Horizon recommends continued quarterly monitoring be performed to evaluate trends in the <br /> groundwater gradient and concentrations of dissolved hydrocarbons over time Horizon also <br /> recommends completion of site feasibility testing on the recent installations followed by <br /> development and installation of remedial systems <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Inf ima, R E H S Mr Gordon Boggs <br /> Environmental Health Division CRWQCB - Central Valley Region <br /> San Joaquin County Public Health Services 3443 Routier Road, Suite A <br /> P O Box 2009 Sacramento, California 95827-3098 <br /> Stockton, California 95201 <br /> If you have any questions, please contact Horizon at (916) 939-2170 <br /> ED Gro,0 <br /> Sincerely, �h 0 <br /> HORIZON ENVIRONMENTAL INC. w REXFORD K SMITH <br /> No 5307 <br /> r p <br /> Gary D arker Rexford Smith OF C <br /> Senior Project Manager Registered Geologist No 530 <br /> 419gmr01Q3 doc <br /> 141944 2 HORIZON ENVIRONMENTAL INC. <br />