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a ` <br /> File No. 2070-2 <br /> 19 September 1988 <br /> tanks; 3) the lack of a well directly downgradient from the old <br /> tank excavation; and 4) a general lack of cross sectional soil <br /> information. <br /> 10. As a result of these concerns, Mr. Boggs requested the <br /> following additional work: <br /> a. Identification of possible underground conduits or <br /> utilities that may cause contamination to move <br /> upgradient. <br /> b. Installation of two neer monitoring wells, one upgradient <br /> (to the west) of MW-4, and one .jownrradient MW-1 (see <br /> Fig. 1) . <br /> C. Two additional soil borings--on the we;,,t and east sides <br /> of the excavation---to confirm the soil t�ps_s and possible <br /> residual soil contamination. <br /> d. Plotted cross sections of the soil hypes encountered on <br /> the site. This information would come from the existing <br /> borings as well as the two new borings requested in 3 <br /> above. <br /> Following is a detailed description of the work procedure to <br /> accomplish the requested work. <br /> Monitoring well Installation <br /> 11. Two borings will be drilled to depths of 55-60 feet in the <br /> locations requested by Mr. Boggs. The bor'ngs will be converted <br /> to monitoring wells. Hollow stem augers will be Wed. <br /> 12. Using a split: barrel sampler, undisturbed soil samples from <br /> the soil borings will be retrieved at five foot intervals. The <br /> samples will be end-sealed in their brass liners with teflon <br /> tape, capped, labelled, and placed in an ice chest for transport <br /> to California Analytical Labs for chemical analysis. The chain <br /> of custody of the samples will be documented. Soil from the <br /> monitoring well borings will be logged continuously in order to <br /> obtain a complete soil profile. <br /> 13. The samples will be screened in the field using a <br /> photoionization detector to confirm the absence/presence of <br /> contamination. Using these results, up to two samples per boring <br /> will be chosen for analysis by California Analytical Labs to . <br /> -3- <br />