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Former Beacon Station No 12419 January 15,2002 <br /> Slockton.California _ _____ __ Groundwater GroundwagLMonitoring Repo <br /> (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 is in <br /> the process of completing a draft, Problem Assessment Report / Corrective Action Plan, for <br /> the site <br /> Report Distribution <br /> We recommend a copy of this report be forwarded to <br /> Mr Michael J Infurna, 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 /> Sincerely, ��4�u Gr <br /> HORIZON ENVIRONMENTAL INC. <br /> V REXFORD K SMITH � <br /> o[ <br /> • <br /> No 530 <br /> Gary D ker Rexford Smith F OF C A`\E <br /> Senior Project Manager Registered Geologist No 5307 -- <br /> 419gmr41Q4 doe <br /> 141944 2 HORIZON ENVIRONMENTAL INC. <br />