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... .�,�, <br /> HORIZON ENVIRONMENTAL INC. <br /> Specialists in Site Assessment,Remedial Testing,Design and Operation <br /> October 13, 1998 <br /> /HT1' ' ' ! ! "_ °•� <br /> Mr. Joe Aldridge <br /> Ultramar Ince 4 <br /> 525 West Third Street ENVIRONMENTAL HEALTH <br /> Hanford, California 93230 PERMIT/SERVICES <br /> Subject: Quarterly Groundwater Monitoring Report <br /> Third Quarter - 1998 <br /> Beacon Station No. 474 <br /> 3443 East Main Street, Stockton, California <br /> Mr. Aldridge: <br /> Horizon Envirorunental Inc. (Horizon) has prepared this Quarterly Groundwater Monitoring <br /> Report which presents results for the third quarter 1998 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 /> i <br /> Groundwater Monitoring <br /> Depth-to-groundwater measurements were obtained from all the monitoring wells by Doulos <br /> Environmental Company (Doulos) on September 8, 1998 (see Table 1). Static groundwater <br /> levels were reported as being measured from the top-of-casing (T.O.C.) of each well (with <br /> water present) and recorded to the nearest 0.01-foot. Water level measurements were <br /> subtracted from reference elevations as reported by previous consultants- to obtain water <br /> elevations, as listed in Table 1. Ultramar Inc. (Ultramar) Field Procedures are presented as <br /> Attachment A with this report. Doulos Field Data 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-5 through MW-9 and - -"' <br /> vapor extraction wells V W-1 'and VW-4. Groundwater samples were not collected from <br /> monitoring wells MW-1 through MW-4 because the screened interval for each of these wells <br /> is submerged, and each of these wells is located adjacent to wells MW-5 through MW-9. <br /> Collected samples were submitted under chain-of-custody (COC) to Kiff Analytical (Kifo, 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 /> 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 />