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r <br /> CHRONOLOGY � <br /> 230 West Elm St.,Lodi <br /> Lodi Public Safety Building <br /> 05/14/1986 San Joaquin County EHD inspection revealed the existence of two underground <br /> storage <br /> tanks (USl): an 18,400-gallon unleaded regular gas #230-2 (State ID, <br /> 34919002) or UST-2,and 130 feet to the west an 10,000-gallon diesel UST#230-1 <br /> State ID 349 <br /> 19001 or UST-1. UST-1 functioned as a boiler fuel tank,and UST-2 <br /> functioned as a motor vehicle fuel tank and standby generator fuel tank. EHD <br /> required investigation of UST-2 to verify there has been no unauthorized release <br /> before closure in place could be granted. <br /> 10/28/1986 Installed two soil borings next to UST-2 to 59 feet bsg. The borings were converted <br /> to monitoring wells MW and MW2. Sod samples were collected at 35.5 feet bsg. <br /> Analytical results were non-detect(ND) for BTEX. <br /> 11/5/1986 Developed MW1 and MW2. <br /> 11/14/1986 Sampled MWl and MW2. Analytical results were ND for BTEX. <br /> j 09/21/1987 UST-1 was removed. Soil samples were collected from the excavation. Analytical <br /> results were ND for diesel and BTX. <br /> 03/23/1988 Sampled MWl and MW2. Results of water samples were ND for BTEX,but trip <br /> blank had a concentration of 1.4 part per billion of Benzene and 1.1 ppb of xylenes. <br /> 3 <br /> 06/10/1988 Re-sampled IvLWl and MW2. Results of water samples and trip blank were ND for <br /> BTEX. <br /> 8/16/1988 Installed new 2,000-gallon diesel UST immediate northwest of UST-2 <br /> 10/18/1988 Removed new 2,000-gallon diesel UST due to failed precision test. Soil samples <br /> from east end of the tank at 12.6 feet bsg had a diesel concentration of 1,600 parts <br /> per million (ppm) and xylenes at 0.49 ppm. <br /> 12/20/1988 Re-excavated to 16 feet bsg. Soil samples collected at depth were ND for diesel and <br /> BTEX. <br /> 10/5/1995 Sampled MW2. Results of MW2 water sample and trip blank were ND for BTEX <br /> and diesel. <br /> 3/24/1998 Sampled MWl and MW2. Results were ND for diesel,BTEX,and MTBE. <br /> 6/17/1998 EHD inspected sampling of MW1,MW2,and domestic well located in the <br /> basement level of the facility approximately 45 feet northwest of MWl. <br /> Construction detail of the\ domestic well is unknown. Results were ND for diesel, <br /> BTEX,and MTBE,1,2-DCA,and EDB using EPA Method 8260. <br /> 12/15/1998 UST-2 closed in place under permit and inspection of EHD. <br />