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DOULOS ENVIRONMENTAL COMPANY <br /> 1537 PINE VALLEY CIRCLE <br /> ROSEVILLE, CA 95661 <br /> (916) 782-9054 <br /> July 15, 1999 <br /> Mr Joseph Aldndge <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93232-0466 <br /> Subject First Quarter 1999 Groundwater Monitoring Report <br /> Former Beacon Station #610 <br /> 3300 Waterloo Rd , Stockton, California <br /> Dear Mr Aldridge <br />�) This report documents the results of ground-water monitonng conducted on March 25, 1999, at the <br /> subject site(Figure 1) The momtonng included measurements of depth to ground-water, subjective <br /> analysis for free product, ground-water purging and collection of ground-water samples All field <br /> activities pertaining to events in this report were conducted according to the Ultramar Field <br /> Procedures included in the Attachments <br /> GROUNDWATER ELEVATIONS <br /> Prior to purging, Doulos Environmental personnel collected depth to ground-water measurements <br /> Ground-water level data from April, 1987 to-date are summarized in the Table On the basis of the <br /> current measurements (collected from MW-1, MW-2, MW-3, and MW-4), ground-water flows to <br /> the southwest(Figure 2) at a gradient of less than 0 0I ft/ft Ground-water levels have increased an <br /> average of approximately 15 15 feet compared to the last monitoring event Monitoring wells MW-5, <br /> MW-6, and MW-7 were not used in the groundwater contour map because they were completed at <br /> deeper depths <br /> Y <br />