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Groundwater Quality Monitoring - 152 East l 1 th Street, Tracy Page 3 <br /> Directly north of the subject property (i e 152 East 11th Street), and across I Ith Street, <br /> there is a Beacon station located at 153 East 11th Street The station is owned by <br /> Ultramar Inc (Ultramar) of Hanford, California <br /> In connection with investigations of a release of hydrocarbon fuels at the Beacon station, a <br /> total of nine ground water monitoring wells have been installed on and around that <br /> property The SJCPHS has assigned the Ultramar property Site Code 1389 <br /> The locations of the monitoring wells that have been installed for the subject site at 152 <br /> East 11th Street that is owned by the Navarras, for the site of Ultramar Inc 's Beacon <br /> Station at 153 East l Ith Street and in surrounding areas are shown on Figure 2 Wells <br /> installed for the Navarras are designated NAV and those installed for Ultramar are <br /> designated ULT <br /> GROUNDWATER QUALITY MONITORING <br /> A program of regular groundwater quality monitoring has been established for the subject <br /> site according to the (;roundAater SamplingPl�roperty at 152 East 11th. Street <br /> Tracy, r (Ref 5) which has been approved by the SJCPHS <br /> The first round of groundwater sampling conducted according to the plan was performed <br /> on July 8th , 1993 and included analysis of samples from all of the wells in both the <br /> Navarra and Ultramar arrays The results of that comprehensive program of groundwater <br /> sampling and analysis were presented in the report titled Extended Investigation of <br /> 5 that was <br /> submitted to the SJCPHS on July 26th 1993 (Ref 4) As called for by the approved <br /> sampling plan, samples of groundwater from selected wells installed for the 152 East I Ith <br /> Street site were subsequently recovered in October 1993 (Ref 3) during the regional dry <br /> season and in February 1994 (Ref 4), during the wet season, to monitor seasonal changes _ <br /> in groundwater quality <br /> The data reported herein are from a sampling round conducted in September 3rd , 1994 <br /> during the second dry season following implementation of the program of regular seasonal <br /> groundwater quality monitoring established by the groundwater sampling plan <br /> Well Purging and Sampling Procedures <br /> To initiate the September 3rd , 1994 sampling program, the depth to groundwater in each <br /> of the Navarra monitoring wells (NAV-1 through NAV-8) was measured using a <br /> conductivity probe These depth are recorded in Table 1 which also gives the water table <br /> elevations computed relative to a local datum established on the top of the casing of Well <br /> ULT-7 (Note For convenience of reference, all depth-to-groundwater data that has been <br /> obtained during successive sampling rounds conducted for the wells installed for both the <br />• 152 and 153 East 11th Street properties, since the well heads of all wells in the array were <br />