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HORIZON ENVIRONMENTAL INC. <br /> Specialists In Site Assessment,Remedial Testing,Design and Operation <br /> July 28, 1999 <br /> Mr. Joe Aldridge <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Hanford, California 93230 <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Second Quarter- 1999 <br /> Beacon Station No. 474 <br /> 3443 East Main Street, 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 1999 monitoring activity for the above- <br /> referenced site (Figure 1). There are currently nine groundwater-monitoring wells (MW-1 <br /> through MW-9) and six vapor extraction wells (VW-1 through VW-6) associated with this <br /> site. All of the wells are located onsite, except for wells MW-4 and MW-5, which are offsite <br /> groundwater monitoring wells (Figure 2). <br /> Groundwater Monitoring <br /> Depth-to-groundwater measurements were obtained from all the monitoring wells by'Doulos <br /> Environmental Company (Doulos) on June 3, 1999 (see Table 1). Static groundwater levels <br /> were reported as being measured from the top-of-casing (T.O.C.) of each well (with water <br /> present) and recorded to the nearest 0.01-foot. Water level measurements were subtracted <br /> from reference elevations as reported by previous consultants to obtain water elevations, as <br /> listed in Table 1. Ultramar Inc. (Ultramar) Field Procedures are presented as Attachment A <br /> with this report. Doulos Sampling Information Sheets are included as Attachment B. <br /> Historical groundwater data as reported by previous consultants is included as Attachment <br /> D. <br /> Groundwater samples were collected from monitoring wells MW-1 through MW-9 and <br /> vapor extraction wells VW-1 and VW-4. A groundwater sample was not collected from <br /> monitoring well MW4 because the wellhead appears to.have been paved over. Collected - --_—- <br /> - samp es 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. As requested by the,San Joaquin County Public Health Services" <br /> 1 Environmental Health Division (SJCPHS/EHD), the groundwater samples were analyzed <br /> for Total Petroleum Hydrocarbons as gasoline (TPHg) and the volatile aromatics benzene, <br /> toluene, ethylbenzene, total xylenes (BTEX) utilizing Environmental Protection Agency <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 (805)589-8389 FAX(805)589-1456 <br />