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HORIZON ENVIRONMENTAL INC. Specialists in Site Assessment,Remedial Testing,Design and Operation October 12, 1998 Mr Joe Aldridge Ultramar Inc o r 525 West Third Street Hanford, California 93230 r Subject Quarterly Groundwater Monitoring Report Third Quarter- 1998 Former Beacon Station No 419 2350 Waterloo Road, Stockton, California Mr Aldridge Horizon Environmental Inc (Horizon) has prepared this Quarterly Groundwater Monitoring Report which presents results for the third quarter 1998 monitoring activity for the above- referenced site (Figure 1) There are currently six groundwater-monitoring wells, MW-1 through MW-6 associated with this site Wells MW-1, MW-2, MW-3, MW-4, and MW-5 are onsite monitoring wells, while MW-6 is an offsite monitoring well (Figure 2) Groundwater Monitoring Depth-to-groundwater measurements were obtained from all the monitoring wells by Doulos Environmental Company (Doulos) on September 8, 1998 (see Table 1) Static groundwater levels were reported as being measured from the top-of-casing (T O C ) of each well and recorded to the nearest 0 01-foot Water level measurements were subtracted from reference elevations as reported by previous consultants to obtain water elevations, as listed in Table 1 Ultramar Inc (Ultramar) Field Procedures are presented as Attachment A with this report Doulos Field Data Sheets are included as Attachment B Historical groundwater data as reported by previous consultants is included as Attachment D Groundwater samples were collected from all monitoring wells Collected samples were submitted under chain-of-custody (COC) to Kiff Analytical (Kiff), a California Department of Health Services-certified analytical laboratory (ELAN No 2236) located in Davis, California Groundwater samples were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg) utilizing EPA Method 8015, for the volatile aromatics benzene, toluene, ethylbenzene, total xylenes (BTEX) by EPA Method 8020, and for fuel additives such as, methyl tertiary-butyl ether (MTBE) utilizing EPA Method 8260 Laboratory results are also summarized in Table 1 Copies of the laboratory reports and chain-of-custody are included as Attachment C 5011 Golden Foothill Parkway,Suite 7 • EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 PO Box 5283 9 Bakersfield CA 93388 . (805) 589-8389 . FAX(805) 589-1456