SITE INFORMATION AND CORRESPONDENCE_1

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1 '�- Ir { � ih II E Attachment 1 4 I Soil Generated 11/94 - 2/95 Site activity during the period 11/94 through 2/95 included the construction of the two AS/SVE wells, two nested piezometers, and the supplemental investigation. During the AS/SVE well and nested piezometer construction, soil generated as drill cuttings was stored in 32 drums. Some of this drill cutting material was observed to have visible gasoline contamination. Each drum was labeled with the boring location and approximate depth of cuttings. Based on cutting depth and observations/PID readings made during boring 11 activity, drums were composite sampled(by hand-pushed soil core) in 6 groups per the following tabular list. There were approximately 7 cubic yards of material stored in the drums The supplemental investigation involved the completion of 7 borings around the outside perimeter of the gasoline plume and the completion of 4 monitoring wells MW-DIS-8S, 8D, 9,and 10. Drill cuttings from these borings were stored in two debris boxes (bins)placed on the disco site. One composite sample was collected from each bin by combining 6 hand pushed soil cores. The combined volume of soil stored in the debris boxes was approximately 20 cubic yards. Analysis of Drill Cuttings Del Monte is researching the disposal issues which will be presented in a supplemental letter. This supplemental letter will linclude the results of the drum composite sample analyses. The drill cuttings that were stored in the two bins were composited and analyzed for.IIBTEX, lead, corrosively, ignitability'l and reactivity. All test results were non-detect and therefore the contents of the bins were,used on site to fill the depressions left near the former service station islands. E Pump Test Water Generated Pump tests were performed on MW-DIS-BS and 8D. Groundwater produced was collected at to a 9 000 allon"rental the well head in a forklift mounted 300 gallon tank and transferred g tank supplied by Rain-for-Rent. We used the quarterly monitoring analytical results,from the subsequent sampling period to characterize the contents of the 9,000 gallon tank. These results were non-detect for BTEX. This will be addressed in a supplemental letter. Disposal of Purge Water from Quarterly Monitoring According to the onsite operator, Don Light, all purge water collected from quarterly monitoring is collected in drums. This will also be further addressed in a supplemental letter.