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Cheaper#76,890 N Main St.,Manteca,Califorma <br /> December 22,1995 <br /> Page 10 <br /> • Soil Borings <br /> Four soil borings were advanced at the site on May 19, 1992. Continuous sampling <br /> provided the subsurface lithology, and two samples per boring were selected for <br /> chemical analysis. The boring locations were placed close to the 1987 excavation <br /> limits to determine if any residual hydrocarbons were present above the water table. <br /> Soil Boring Sample Results, 5/19/92 <br /> Cheaper Store #76 <br /> 890 North Main Street, Manteca, California <br /> Sample I.D. TPH-gas benzene toluene ethylbenzene xylenes <br /> B-1-2 25 <0 005 026 012 068 <br /> B-1-15 <10 <0 005 <0 005 <0 005 <0 005 <br /> B-2-7 <10 <0 005 <0 005 <0 005 <0 005 <br /> B-2-16 < 10 <0 005 <0 005 <0 005 <0 005 <br /> B-3-10 < 10 <0 005 <0 005 <0 005 <0 005 <br /> B-3-18 <10 <0 005 <0 005 <0 005 <0 005 <br /> B-4-10 <10 <0 005 <0 005 <0 005 <0 005 <br /> B-4-16 <10 <0 005 <0 005 <0 005 <0 005 <br /> *Sample results are m parts per million or mg/Kg <br /> Monitoring Wells <br /> • On March 5, 1987, Kleinfelder consultants reported that 3 monitor wells <br /> (MW-1 through MW-3) were installed on March 2, 1987, south, north and <br /> northwest, respectively, of the former underground storage tank location. <br /> The wells were developed and sampled March 3, 1987. Groundwater was <br /> encountered 13 feet below ground surface A fourth monitoring well was <br /> installed at the site on September 6, 1991, by Parker Environmental Services. <br /> On that day, groundwater was encountered 27 feet below ground surface <br /> Quarterly Monitoring <br /> All three wells were tested for TPH-g, TPH-d, and BTEX during all four <br /> quarters of monitoring. MW-3 was additionally tested for the five LUFT <br /> metals, 28 volatile Halocarbons, and Total Oil and Grease Most samples were <br /> ND, all detected substances during the four quarters are presented in Table 1. <br /> Table 1 <br /> 1994 Monitoring Well Summary <br /> Laboratory Analysis Results <br /> 2770 Camino Tassajara, Danville, CA <br /> Mono► Well Substance Concentration b <br /> • March MW-1 TEX 092, 063,26 <br /> March MW-2 TEX 072, 053,23 <br /> Parker Environmental Services, 190 East 7th Street, Pittsburg, CA 94565-2317 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />