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Nations Groundwater Associates <br /> 0 <br /> HYDROGEOLOGISTS&GEOLOGISTS <br /> December 31, 1994 <br /> y^^5l-j-r <br /> Mr Randall K Stephenson <br /> Ultramar Inc <br /> 525 West Thud Street <br /> Hanford, California 93232-0466 <br /> Subject Fourth Quarter 1994 Groundwater Monitoring Report <br /> Beacon Station #419 <br /> 2350 Waterloo Road, Stockton, California <br /> Dear Mr Stephenson1j �,.� <br /> This report documents the results of quarterly groundwater monitoring conducted on October 11. <br /> 1994 at the subject site(Figure 1) The monitoring, conducted by Doulos Environmental,included <br /> measurements of depth to groundwater, subjective analysis for free product, groundwater purging <br /> and collection of groundwater samples All field activities pertaining to events in this report were <br /> conducted according to the Ultramar Field Procedures included in the Attachments <br /> GROUNDWATER ELEVATIONS <br /> Prior to purging, Doulos Environmental personnel collected depth to groundwater measurements <br /> Groundwater level data from July 1994 to date are summarized in Table 1 On the basis of the <br /> current measurements, groundwater flows to the sguthwest(Figure 2) at a gradient of less than 0 <br /> ft/ft Groundwater levels have decreased an average of approximately 4 feet compared to the last <br /> monitoring event <br /> GROUNDWATER SAMPLING AND ANALYSES <br /> Groundwater samples were collected from all three wells All samples were analyzed for <br /> concentrations of <br /> • TPH, as gasoline, modified EPA Method 8015 <br /> • BTEX by EPA Method 602 <br /> P.O Boa 276325 Sacramento,California 95827-6325 (916)3614095 <br /> (916)36141096 FAX <br />