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s . <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment Remedial Testing Design and Operation <br /> July 27, 1998 <br /> Mr Joe Aldridge <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject QUARTERLY GROUNDWATER MONITORING REPORT <br /> J <br /> Second Quarter- 1998 <br /> Beacon Station No 641 <br /> 1210 East Hammer Lane, Stockton, California <br /> Mr Aldridge <br /> Horizon Environmental Inc (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report which presents results for the second quarter 1998 monitoring activity for the above- <br /> referenced site (Figure 1) There are currently five groundwater monitoring wells (MW-1 <br /> through MW-5) and one sparge well (SW-1) associated with this site Wells MW-1, MW-3, <br /> MW-4, and MW-5 are onsite monitoring wells, while MW-2 is an offsite monitoring well <br /> (Figure 2) <br /> Groundwater Monitoring <br /> Depth-to-groundwater measurements were obtained from all the monitoring wells by Doulos <br /> Environmental (Doulos) on June 10, 1998 (see Table 1) Static groundwater levels were <br /> measured from the top-of-casing (TOC) of each well and recorded to the nearest 0 01 foot <br /> Water level measurements were subtracted from reference TOC elevations to obtain <br /> groundwater elevations, as listed in Table 1 Ultramar Field Procedures are presented as <br /> Attachment A, and Doulos Sampling Information Sheets are included as Attachment B <br /> Groundwater samples were collected from all five momtori<ng wells Collected samples <br /> were submitted under chain-of-custody (COC) to Kiff Analytical (Kiff), a California <br /> Department of Health Services-certified analytical laboratory (ELAN No 2236) located in <br /> Davis, California Groundwater samples were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg) utilizing modified Environmental Protection Agency (EPA) Method 8015 <br /> or 8260B, and for the volatile aromatics benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX) and the fuel oxygenate methyl tertiary-butyl ether (MTBE) utilizing EPA Methods <br /> 8020 or 8260B Laboratory results are summarized to Table 1 Copies of the laboratory <br /> data sheets and the chain-of-custody report are included as Attachment C <br /> 5011 Golden Foothill Parkway,Suite 7 - El Dorado Hills,CA 95762 - (916)939-2170 - FAX (916)939-2172 <br /> PO Box 5283 - Bakersfield,CA 93388 - (805)589-8389 9 FAX(805)589-1456 <br />