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`} HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> January 27, 1999 <br /> Mr Joe Aldridge <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject Quarterly Groundwater Monitoring Report <br /> Fourth Quarter- 1998 <br /> Former Beacon Station No 419 <br /> 2350 Waterloo Road, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report which presents results for the fourth quarter 1998 monitoring activity for the above- <br /> referenced site (Figure 1) There are currently ten groundwater monitoring wells, MW-1 <br /> through MW-10, associated with this site All monitoring wells, with the exception of well <br /> MW-6, are located within site boundaries (Figure 2) <br /> Groundwater Monitoring <br /> Depth-to-groundwater measurements were obtained from all the monitoring wells by Doulos <br /> Environmental Company (Doulos) on December 30, 1998 (see Table 1) Static groundwater <br /> levels were reported as being measured from the tap-of-casing (T O C ) of each well and <br /> recorded to the nearest 0 01-foot Water level measurements were subtracted from reference <br /> elevations as reported by previous consultants to obtain water elevations, as listed in Table <br /> 1 Ultramar Inc (Ultramar) Field Procedures are presented as Attachment A with this <br /> report Doulos Field Data Sheets are included as Attachment B Historical groundwater <br /> data as reported by previous consultants is included as Attachment D <br /> Groundwater samples were collected from all ten groundwater monitoring wells at the site <br /> Collected samples were submitted under chain-of-custody (COC) to Kiff Analytical (Kiff), a <br /> California Department of Health Services-certified analytical laboratory (ELAN No 2236) <br /> located in Davis, California Groundwater samples were analyzed for Total Petroleum <br /> Hydrocarbons as gasoline (TPHg) utilizing Environmental Protection Agency (EPA) <br /> Method 8015, for the volatile aromatics benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), and for the fuel oxygenate methyl tertiary-butyl ether (MTBE) by EPA Methods <br /> 5011 Golden Foothill Parkway Suite 7 - EI Dorado Wills CA 95762 - (916)939-2170 . FAX(916)939-2172 <br /> PO Box 5283 - Bakersfield CA 93388 - (805) 589-8389 - FAX (805)589-1456 <br />