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. 15 November 2000 , <br /> AGE-NC Project No 95-0142 <br /> Page 4 of 9 - <br /> Joaquin County Flood Control District and Water Conservation District(FCD&WCD), the estimated <br /> depth to ground water at the site to be 30 feet bsg Review of the map Lanes of Equal Elevation of <br /> Groundwater Sprang 1998'(FCD&WCD) depicts the regional ground water flow direction towards <br /> the northwest and west Between May 1995 and current, depth to ground water measured from wells ` <br /> on the site have shown an increase of the depth to ground water from 50 feet bsg to 25 feet bsg, with <br /> a general ground water flow direction towards the east and southeast Ground water elevation <br /> contour maps for the site were included in previous Quarterly Reports prepared by AGE <br /> Review of previous ground water monitoring at the site and historical depth to ground water maps <br /> (FCD&WCD) dating back to 1971 suggests that ground water depth near the site has fluctuated <br /> between 60 feet bsg <br /> 3 0 SCOPE OF WORK <br /> The scope of the work includes the installation of ground water extraction wells, performance of a <br /> ground water extraction pump test, analysis of grab water samples and soil samples to assess vertical <br /> extent of impacted media, and analysis of selected soil samples for permeability and porosity <br /> • s <br /> Two ground water extraction wells should be installed at the southeastern corner of the former UST <br /> area and directly down-gradient fifteen feet from the known hydrocarbon release, also in the area of <br /> the highest concentration dissolved hydrocarbons A pump test at a nearby site having similar soil <br /> compositions yielded a radius of influence of approximately 16 to 17 feet at a pumping rate of 13 <br /> gallons per minute (reported by AGE in Corrective Actaon'Plan Report, SIERRA LUMBER, 375 West <br /> Hazelton Avenue, Stockton, California, dated 15 February 2000) The pump test calculations for the <br /> Sierra Lumber site are included in Appendix A of this report <br /> Field test activities will consist of the following tasks <br /> • Permitting and pre-field work activities, <br /> • Drilling, soil sampling and well instal lation/development, <br /> • Laboratory analysis of soil samples <br /> • Pump test, and <br /> • Properly storing and disposing of produced ground water <br /> • t 1 r <br /> Advanced GeoEnvironniental,[nc <br />