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yf , Coen •1 FUGRO WEST, INC. September 18, 1996 1050 Melody tie suite 160 Fugro Project No 9647-0771 Roseville California 95678 Tel (916)782-2110 FAX (916)786-7830 Ms Pamela Lopez c/o Bob Holiday 26500 Nowell Road Thornton, California 95686 Subject Third Quarter 1996 Ground Water Monitoring Report Lopez Property 26500 Nowell Road, Thornton, California Dear Ms Lopez Fugro is pleased to provide this report documenting the results of quarterly ground water monitoring conducted at the subject site (Figure 1 - Site Location Map) on August 22, 1996 The monitoring event included collection of depth to ground water measurements, and the collection of ground water samples for chemical analyses from monitoring wells MW-1 through MW-3 (refer to Figure 2 - Site Map) This report is based, in part, on information provided to Fugro by Ms Pamela Lopez, and is subject to modification as new information is received • BACKGROUND The site is a pnvate residence located on the east side of Nowell Road in a rural portion of Thornton, Cahforrua Adjacent to and south of the property is a Tri-Valley Growers canning facility The canning facility includes former underground storage tanks (USTs) and a forklift shop within 50 feet of the southern site boundary The subject site was purchased by Ms Lopez in 1979 with an existing 500-gallon-capacity gasoline UST on the property According to the previous owners, the UST had not been used for 10 to 15 years On October 9, 1989, the UST was removed One soil sample was collected from the base of the excavation and analyzed for the presence of total petroleum hydrocarbons identified as gasoline (TPH-g) and benzene, toluene, ethylbenzene, and total xylenes (BTEX) The analytical results uidicated that a release of petroleum hydrocarbons had occurred The analytical results are included as Attachment 1-Analytical Results Soil and Ground Water-Previous Investigations In November 1994, three soil borings were drilled and sampled at the subject site by RAH Environmental, Inc (Figure 2) Two of the soli bonngs (SB-3 and SB-4) were advanced in conjunction with a subsurface uivestigation of the adjacent Tri-Valley Growers' property, and one boring (SBA) was advanced at the former UST location to evaluate the vertical extent of the release Soil samples collected from the sod borings were analyzed for the presence of TPI-g and BTEX. TPH g and BTEX concentrations were below the Iaboratory detection limits in soil samples collected from soil bonngs SB-3 and SB-4 Chemical analysis of the soil samples collected from soil boring SBA indicated that petroleum hydrocarbons were present below the water table The analytical results are included in Attachment 1 A member of the Fugro group of companies with offices throughout the world 96470771 AQM