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2.0 SUBSURFACE INVESTIGATION METHO To evaluate if groundwater extraction is a viable option and groundwater, a soil boring was advanced approxii location at the location shown on Figure 2. All field with Foothill Engineering's Work Plan for Extraction This workplan was approved by SJCEHD with modifica 2.1 Drilling Activities Hollow stem auger drilling was conducted on October 8 license no. 512268). Soil boring EW -1 was advanced t inch diameter groundwater extraction well. A soil sam feet bgs, but due to a miscommunication with the analyt sample was not analyzed. A field geologist logged th Classification System. The cored sample was character visual evidence of petroleum hydrocarbons. The soil c Ionization Detector (FID) for the presence of volatile or types encountered is included on the well constructio cuttings were temporarily stored on site in 55 -gallon DO 2.2 Groundwater Extraction Well Construction AND PROCEDURES r remediating petroleum impacted soil tely 25 feet south of the former UST dvities were performed in accordance ell Pump Test, dated April 12, 2000. 2001, by Spectrum Drilling (State C57 61.5 feet and was completed as a six - le was collected from the boring at 60 ;al lab the holding time expired and the soil sample utilizing the Unified Soil ped for soil type, moisture content, and mple was field screened with a Flame anic compounds. A description of soil log contained in Appendix A. Drill approved steel drums. Soil boring EW -1 was completed as a six-inch diameter groundwater extraction well to be used in the groundwater extraction and treatment pilot test. The screen interval of the extraction well was positioned from approximately 50 feet bgs to 60 feet bgs. The screen slot size was 0.020 - inch. The well construction details for well EW -1 are shown on the well construction log contained in Appendix A. 2.3 Extraction Well Development Groundwater extraction well EW -1 was surge blocked on October 22, 2001 by Spectrum Drilling. The groundwater extraction well was developed by ATC on November 7, 2001. The well was purged until the extracted water was relatively sediment free. Development logs are included in Appendix B. Purgewater was temporarily stored on site in 55 -gallon drums. 3.0 GROUNDWATER PUMPING PILOT TEST A groundwater pumping test was proposed in Foothill Well Pump Test, dated April 12, 2000. The goal of the aquifer data necessary to characterize the feasibility of op -� the site by providing the following parameters: w A259571reporlslpumptest.doc IJ 4 ineering's Work Plan for Extraction mdwater pumping test was to provide ing a groundwater treatment system at