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/ � <br /> Tc ream <br /> ark <br /> July 21, 1993 J U L 2 3 1993 <br /> Ms Brooke Birkie PIRMIITISE VICENTAL ES TM <br /> Neumiller & Beardslee <br /> 509 West Weber Avenue, Fifth Floor <br /> Stockton, California 95201-3020 <br /> Dear Ms Birkie. <br /> JUNE 1993 QUARTERLY GROUNDWATER SAMPLING AND ANALYSIS <br /> CONDUCTED AT 4555 NORTH PERSHING AVENUE IN STOCKTON, CALIFORNIA <br /> Enclosed please find the results of the June 1993 quarterly groundwater sampling and analysis <br /> conducted at the former cardlock refueling facility located at 4555 North Pershing Avenue in <br /> Stockton, California. This work was conducted in accordance with the State Water Resources <br /> Control Board Leaking Underground Fuel Tank (LUFT) and Regional Water Quality Control <br /> Board (RWQCB) Guidelines for the preliminary evaluation and investigation of underground tank <br /> sites <br /> Petroleum hydrocarbons as gasoline were detected in groundwater samples collected from <br /> monitoring wells MW1 and MW4 at concentrations of 0.69 milligrams per liter (mg/1) and 0.84 <br /> mg/l, respectively Concentrations of benzene were detected in groundwater samples collected <br /> from monitoring wells MW2, MW3 and MW4 at concentrations of 9 5 micrograms per liter <br /> (µg11), 78 µg/l and 430 µg/1, respectively The groundwater flow direction was determined to <br /> be to the northeast during the June 1993 groundwater sampling event <br /> If you have any questions regarding this report, please do not hesitate to call either of us at (5 10) <br /> 521-5200 <br /> Sincerely, <br /> J M Christensen, REA Christopher S Alger, C E.G <br /> Mager, Environmental Assessments Senor Geoscientist <br /> Principal Geoscientist <br /> Enclosure <br /> cc, Michael Collins <br /> moaioa2 <br /> 1135 Adanac Avenue,Alameda,CA 94501 (510)521-5200 FAX(510)521-1547 <br />