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F <br /> UST Closure Report <br /> Sharpe Defense Distribution Region West <br /> Lathrop,California Page 11 <br /> parameters of 14 days was exceeded before CAL INC received an approval from the USACE for <br /> a contract modification to cover the cost of the analyses. <br /> 4.1.2 Excavation Floor Samples (T-1W through T-7W, IE through 7E and Tank 8� <br /> Mr. Rollin Hall of Neil O. Anderson & Associates collected 10 soil samples from the floor of the <br /> UST excavations on December 24 (lE-7E, 1S and 7N series). Mr. Rene Sanchez of Neil O. <br /> Anderson collected 7 additional soil samples from the UST excavation floor on December 28 (T- <br /> 1W to T-7W series). The series were collected under the direction of Messrs. Travena and <br /> Sasson of the SJCEHD. Mr. Travena described the samples as predominantly sandy loam with <br /> some clay. He noted that the soil had no odor or obvious discoloration (Appendix 8). The <br /> samples were collected from the soil just beyond the sides and ends of the concrete hold-down <br /> slab, opposite the ends of the USTs (Figure 5). They were analyzed by North State <br /> Environmental Laboratories on January 2, 5 and 8, 1999. <br /> 4.1.3 UST Groundwater Samples (H2O #1 through#7) <br /> Seven groundwater samples were collected from the UST excavation on December 23 and 24 by <br /> Neil O. Anderson. Mr. Travena noted that only two of the samples had an oily sheen. Only one <br /> of those had a petroleum hydrocarbon odor. These water samples were also not analyzed. <br /> 4.1.4 UST Sub-Holddown Pads Samples (South, Center and North) <br /> Mr. Sasson (SJCEHD) requested the collection of three soil samples from beneath the concrete <br /> UST anchor pads. On December 29, three holes were bored through the pads about 25 feet apart <br /> (Figure 5). The holes were drilled to a 3 to 4-inch diameter by Cal West Concrete. The 15-inch <br /> thick pad was underlain by 6 inches of 1.5-inch diameter gravel. On December 30, Mr. Sanchez <br /> of Neil O. Anderson collected samples of the soil beneath the pads through each of the three bore <br /> holes, and labeled them South, Center and North. The three samples were analyzed on January 6, <br /> 7 and 8, 1999 by the North State Environmental Analytical Laboratory. <br /> 4.1.5 Stockpiles SPA and SPB Samples (SP-1-SH through SP-16-SH) <br /> Soil samples SP-1-SH through SP-16-SH were collected by Mr. Steve Essert of CAL INC on <br /> January 11, 1999. They are from the two stockpiles (SPA and SPB) formed by consolidating the <br /> original five stockpiles around the perimeter of the UST excavation. The samples were grouped <br /> into four composite samples (SP-1,2,3,4-SH; SP-5,6,7,8-SH; SP-9,10,11,12,13-SH and SP- <br /> 13,14,15,16-SH) and analyzed by GeoAnalytical Laboratories, Inc. on January 11 and 12. Mr. <br /> Sasson (SJCEHD) told CAL INC that sample analyses could not be used to characterize the <br /> stockpile material and determine its suitability as UST excavation backfill. This would, <br /> according to Mr. Sasson, require a `third party' collecting the samples in the presence of a <br /> ® representative from the SJCEHD, and analysis of only discrete samples. <br /> N:\PROJECTS\3546\Reports\3546 UST Closure Report Draft.doc March 24,1999 <br />