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Beacon Station No 3641 June 18, 2002 <br /> Stockton California Quarterly Groundwater Monitoring Repo <br /> as gasoline (TPHg), the volatile aromatic compounds benzene, toluene, ethylbenzene and <br /> •) total xylenes (BTEX), and the fuel oxygenate methyl tert-butyl ether (MTBE) by <br /> Environmental Protection Agency (EPA) Method 8260B Analytical reports and the chain- <br /> of-custody document are contained in Attachment C <br /> Results <br /> Depth-to-groundwater measurements were subtracted from the surveyed TOC elevations to <br /> calculate groundwater elevations Groundwater elevation data, summarized in Table 1, were <br /> used to construct a groundwater contour map (Figure 2) <br /> Analytical data are summarized in Table 1 Benzene concentration data were used to <br /> construct a benzene isoconcentrati.on map (Figure 3) <br /> Recommendations <br /> It is recommended that quarterly groundwater monitoring be continued to evaluate <br /> groundwater quality trends Horizon is preparing a Problem Assessment Report and <br /> Corrective Action Plan in order to facilitate initiation of remedial actions at the site <br /> Distribution <br /> . A copy of this report should be forwarded to <br /> Mr Michael Infurna Jr , R E H S <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> P O Box 388 <br /> Stockton, California 95201-0388 <br /> Mr Gordon Boggs <br /> Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> • <br /> 641grnrOZQ1 doc <br /> 164145 2 HORIZON ENVIRONMENTAL INC. <br />