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Beacon Station No 3641 August 28, 2001 <br /> Stockton. CahfbMiae <br /> total petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, <br /> toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenate methyl tert-butyl <br /> ether (MTBE) by Environmental Protection Agency (EPA) Method 8260B The laboratory <br /> data sheets and the chain-of-custody document are included as 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 isoconcentration map (Figure 3) <br /> Recommendations <br /> Horizon recommends continued quarterly monitoring to evaluate groundwater quality <br /> trends, and development of a Problem Assessment Report and Corrective Action Plan as <br /> recommended in the Horizon document Results of Additional Subsurface Investigatign <br /> dated June 15, 2000 <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 /> 641gmrO1Q2 doc <br /> 164144 2 HORIZON ENVIRONMENTAL INC <br />