Laserfiche WebLink
Groundwater Quality Monitoring ' 152 East I Ith Street, Tracy Page 3 <br /> Directly north of the subject property (i e 152 East 11th Street), and across 1 Ith Street, <br /> ! there is a Beacon station located at 153 East llth 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 I Ith Street that is owned by the Navarras, for the site of Ultramar Inc 's Beacon <br /> Station at 153 East 1 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 (iroundwatu Sa pling Plan - Pr nerty at 152 Et 1 1 th Street.. <br /> al (Ref 9) 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 lny�:stigatiou_of <br /> Groundwater Quality - Property at 152 East 1 1th Street, Tracy__California, that was <br /> submitted to the SJCPHS on July 26th 1993 (Ref 8) As called for by the approved <br /> sampling plan, samples of groundwater from selected wells installed for the 152 East 1 Ith <br /> Street site were subsequently recovered in October 1993 (Ref 7) and September 1994 <br /> (Ref 3) during the regional dry season and in February 1994 (Ref 5) and February 1995 <br /> (Ref 2) during the wet season so as to monitor seasonal changes in groundwater quality <br /> Because the onset of the wet season in Northern California was delayed, the round of <br /> sampling scheduled for the end of the 1995 dry season was deferred until November 15th <br /> 1995 <br /> The data reported herein are from a sampling round conducted in November 15th , 1995 <br /> Well Purging and Sampling Procedures <br /> To initiate the November 15th , 1995 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 1 Ith Street properties, since the well heads of all wells in the array were <br />