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Former Beacon Station No 12419 September 10,2001 <br /> Stockton.California Groundwater <br /> Davis, California The samples were analyzed for total petroleum hydrocarbons as gasoline <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 1 Copies of the laboratory data sheets and chain- <br /> of-custody documents are included as Attachment C Benzene concentration data from this <br /> sampling event were used to construct a benzene isoconcentration map as shown on Figure 3 <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 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, ����" G Ep�O <br /> RIZON ENVIRON ENTAL INC. <br /> yU REXFORD K SM13H <br /> T--� cc <br /> No 5307IPA <br /> Gary D Barker Rexford Smith 9IlF ��Fo4 <br /> CA <br /> Senior Project Manager Registered Geologist No7 <br /> . Attachments <br /> 419gmr41Q2 doc <br /> 141944 2 HORIZON ENVIRONMENTAL INC. <br />