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Groundwater Quality Monitoring - 152 East 11th Street, Tracy Page 3 Directly north of the subject property (i e 152 East 11th Street), and across 11th Street, there is a Beacon station located at 153 East 11th Street The station is owned by Ultramar Inc (Ultramar) of Hanford, California In connection with investigations of a release of hydrocarbon fuels at the Beacon station, a total of nine ground water monitoring wells have been installed on and around that property The SJCPHS has assigned the Ultramar property Site Code 1389 The locations of the monitoring wells that have been installed for the subject site at 152 East 11th Street that is owned by the Navarras, for the site of Ultramar Inc 's Beacon Station at 153 East 11th Street and in surrounding areas are shown on Figure 2 Wells installed for the Navarras are designated NAV and those installed for Ultramar are designated ULT GROUNDWATER QUALITY MONITORING On February 25th , 1994 a round of groundwater sampling was conducted at the 152 East 11th Street site The work was part of the program established by the Groundwater Sampling Plan - Property at 152 East 11th. Street, Tracy, California which has been approved by the SJCPHS The first round of groundwater sampling conducted according to the Plan was performed on July 8th , 1993 and included analysis of samples from all of the wells in both the Navarra and Ultramar arrays The results of that comprehensive program of groundwater sampling and analysis were presented in the report titled Extended Investigation of Groundwater Quality - Property at ._152 East 11th Street, Tracy, California, that was submitted to the SJCPHS on July 25th 1993 The sampling round reported herein was intended to investigate depths to groundwater, the groundwater gradient, the groundwater flow direction and groundwater quality during the regional wet season A round of sampling to investigate conditions during the dry season was conducted on October 13th 1993 and the results reported in Quarterly Status and Monitoring Report, August 1 to October, 3l_,_ 1993 - 152 East 1 lth_ Street, Tracy,, California. Well Purging and Sampling Procedures To initiate the February 25th 1994 sampling program, the depth to groundwater in each of the Navarra monitoring wells (NAV-1 through NAV-8) was measured using a conductivity probe These depth are recorded in Table 1 which also gives the water table elevations computed relative to a local datum established on the top of the casing of Well ULT-7 (Note For convenience of reference, all depth-to-groundwater data that has been obtained during successive sampling rounds conducted for the wells installed for both the 152 and 153 East 1 Ith Street properties, since the well heads of all wells in the array were surveyed in July 1993 to establish their elevations relative to a common datum, are compiled in Table 3 )