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AILA <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists In Site Assessment,Remedial Testing,Design and Operation <br /> October 29, 1999 <br /> Mr Joe Aldndge <br /> Ultramar Inc <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject QUARTERLY GROUNDWATER MONITORING REPORT <br /> Third Quarter - 1999 <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 third quarter 1999 monitoring activity for the above- <br /> referenced site (Figure 1) There are currently five groundwater-monitoring wells (MW-1 <br /> through MW-5), eight vapor wells (VW-1 through VW-4 and VE-5 through VE-8) and one <br /> sparge well (SW-1) associated with this site Wells MW-1, MW-3, MW-4, and MW-5 are <br /> onsite groundwater monitoring wells, while well MW-2 is an offsite groundwater monitoring <br /> well (Figure 2) <br /> Groundwater Monitoring <br /> Doulos Environmental Company (Doulos) obtained depth-to-groundwater measurements <br /> from monitoring wells MW-1 through MW-5, sparge well SW-1, and three of the eight vapor <br /> wells on August 31, 1999 (see Table 1) Static groundwater levels were measured from the <br /> top-of-casing (TOC) of each well and recorded to the nearest 0 01-foot Water level <br /> measurements were subtracted from reference TOC elevations to obtain groundwater <br /> elevations, as listed in Table 1 Ultramar Field Procedures are presented as Attachment A, <br /> and Doulos Sampling Information Sheets are included as Attachment B <br /> Groundwater samples were collected from all five groundwater monitoring wells, the sparge <br /> well, and three of the eight vapor wells (VW-1, VW-3 and VW-7) Locations of the wells <br /> are shown with other pertinent site features on the attached Site Map (Figure 2) The <br /> collected samples were submitted under chain-of-custody protocol to Kiff Analytical (Kiff), a <br /> California Department of Health Services-certified analytical laboratory (ELAN No 2236) <br /> located in Davis, California The groundwater samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPHg), the volatile aromatics benzene, toluene, ethylbenzene and <br /> • <br /> 5011 Golden Foothill Parkway,Suite 7 + EI Dorado Hills,CA 95762 • (916)939-2170 • FAX(916)939-2172 <br /> PO Box 5283 • Bakersfield,CA 93388 9 (805)589-8389 • FAX(805)589-1456 <br />