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3" <br /> iF <br /> tti <br /> MOM <br /> �1 <br /> 4. SUMMARY OF REVISED PAR <br /> Since the previous version of the Problem Assessment Report (PAR) <br /> for the site of former Exxon RS 7-1050, 909 W. Hammer Lane, <br /> Stockton, was prepared, two quarterly samplings have been carried <br /> out. The information from those samplings has had an effect on <br /> the responses to concerns expressed by the San Joaquin County <br /> Environmental Health Division and the Central Valley Regional <br /> Water Quality Control Board. The responses have been included in <br /> Chapter 1 of this revised PAR. <br /> Additio0al water gauging at the site since August 1969 indicates <br /> that. the groundwater elevation is currently rising. Results of <br /> the analysis of samples collected from the groundwater wells in <br /> December. .1989 and: February 1990are largely consistent with <br /> trends in contaminant concentrations established over the last <br /> two 'years. An exception' is that: water collected from MW4 on 14 ' <br /> February 1990 was found to contain benzene at a concentration of <br /> 'ug/L, ' for the first' time since June 1987. . This. sainple may ' <br /> not-have been representative of the groundwater. outside ,the -well, <br /> ( i <br /> casing; as it was highly turbid. and MW4 could not -be properly } <br /> purged before-',the samples were. collected (nor could ,MW5) { <br /> . - - f y <br /> ' e35/77050/2-90/tx 26. <br /> .. _ <br /> 4 <br />