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0 <br /> 1.0 INTRODUCTION/HISTORY <br /> BJJ Company, Inc. operates a trucking facility located at <br /> 2431 East Mariposa Road, Stockton, California (Figure 1 ) . <br /> Three underground fuel storage tanks are maintained at the <br /> facility. Two of the tanks are newly installed double- <br /> walled tanks used to contain diesel for company trucks. <br /> These tanks are located near the facility entrance. The <br /> ' other tank is a 3500 gallon underground tank located <br /> partially beneath one of the maintenance buildings. This <br /> tank is the subject tank proposed for an-place abandonment. <br /> ' Figure 2 depicts the tank and piping locations relative to <br /> other facility features. <br /> Although this tank is approximately 43 years old, there had <br /> ' been no indications of product loss or tank leakage. A <br /> monitoring program was implemented beginning in 1985 , <br /> pursuant to local and state requirements for all underground <br /> ' storage tanks. Annual tank system tightness tests utilizing <br /> static pressure by applied product head have been conducted <br /> as part of the monitoring program. The most recent test was <br /> ' conducted on March 16, 1990. These tests have consistently <br /> found the tank system to be "tight" pursuant to local and <br /> state requirements and NFPA guidelines. Tank test results <br /> from 1989 and 1990 tests are presented an Appendix A. Daily <br /> ' volume gauging by "stacking" the tank and inventory record <br /> checks are also conducted as part of the monitoring program. <br /> Records have reflected no observable losses over the <br /> monitoring period. <br /> Due to the location of the tank, BJJ Company, Inc. requested <br /> and received conditional approval for an-place abandonment <br /> from the Montezuma Fire Protection Distract. A copy of the <br /> Fare Districts letter is presented in Appendix I. <br /> ' A phased approach to abandonment in place was proposed by <br /> WaterWork. Phase I was to include a demonstration that the <br /> tank had not leaked and does not present a threat to <br /> groundwater. Upon conducting a successful demonstration and <br /> acceptance by the County Public Health Services , <br /> Environmental Health Division and the Central Valley <br /> Regional Water Quality Control Board, Phase II would be <br /> ' implemented. Phase II would include actual tank abandonment <br /> activities and a final report. Phase I field activities <br /> were conducted on June 15, 1990. <br /> 1 <br />