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�Arff�� <br /> July 21, 1993 Working To Restore Nature <br /> Fire Engine Company No 2, Stockton, California <br /> On October 21, 1992, a groundwater pumping test was conducted to evaluate the aquifer <br /> characteristics of the first encountered groundwater zone Preliminary results of the <br /> pumping test indicated the capture zone is 12 feet with a pumping rate of 3 S gallons per <br /> minute. A complete evaluation of the pumping test results will be included in the pending <br /> RAP <br /> ADDENDUM WORK PLAN <br /> To further assess the distribution of residual gasoline in soil and evaluate remedial <br /> alternatives, RESNA will drill four soil borings, install two vapor-extraction wells, conduct <br /> a vapor-extraction test, and install one groundwater monitoring well Our field methods for <br /> well installation are discussed in the attached Field Methods The proposed location of the <br /> groundwater monitoring well is shown on Plate 1 and the proposed locations all onsite soil <br /> borings and vapor-extraction wells are shown on Plate 2 Schematics of the well designs are <br /> shown on Plates 3 and 4 <br /> A second vapor-extraction test will be conducted to further assess vapor extraction as a soil <br /> remediation alternative and to evaluate the most appropriate type of off-gas treatment, if <br /> applicable. The test will provided additional data of the soil volume influenced by vapor <br /> extraction The groundwater monitoring well will be installed offsite to further evaluate the <br /> lateral extent of dissolved hydrocarbons in groundwater <br /> RESNA will conduct the following tasks <br /> Task 1 Permitting and Office Operations <br /> o Contact Underground Service Alert at least 48 hours before drilling to delineate <br /> public utility lines at the site In addition, we will subcontract a line locating service <br /> to locate underground lines near the drilling area <br /> o Obtain a permit from the City of Stockton Department of Public Works to drill and <br /> install one monitoring well in Madison Avenue <br /> o Acquire drilling permits from the San Joaquin County Public Health Services, <br /> Environmental Health Division (SJCPHS-EHD), to drill four borings and install two <br /> vapor-extraction wells and one monitoring well <br /> 0 38009-sw 2 <br />