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I SII'] f34� ftRi off zt <br /> I d r l.� t fh_ <br /> GROUND ZERO ANALYSLS, INC, I t t;° S;F 1) ((1,;:, <br /> 22915 U21I - PH..2` 37 _. <br /> W. March Lane, Suite 127D <br /> Stockton, California 95207 <br /> Telephone: (209) 952-3481 <br /> Fatsunile: (209) 952-9892 <br /> November 1, 1996 <br /> Mr. Michael Infurna <br /> San Joaquin County PHS/EHD <br /> P O Box 0388 <br /> Stockton, CA 95201-0388 <br /> Subject Third Quarter 1996 Monitoring and Sampling Report <br /> Former Reeve's Exxon, 2360 East Street, Tracy, California <br /> Dear Mr. Infurna- <br /> • This Ietter report presents the results of the Third Quarter 1996 groundwater monrtonng and <br /> sampling at the subject site (Figure 1) <br /> Groundwater monitoring was conducted on October 7, 1996 on wells MW1, MW2, and MW3 <br /> The groundwater elevations across the site fell an average of 0.04 feet since the last monitoring <br /> event on June 27, 1996 (Table 1) Figure 2 depicts the groundwater flow direction and <br /> hydraulic gradient on October 7, 1996 Flow direction at the site was generally to the northeast <br /> at a gradient of approximately 0 005 ft/ft Monitoring data are included in Attachment A <br /> On October 7, 1996 after purging at least three casing volumes of groundwater and stabilization <br /> of temperature, pH, and electrical conductivity, samples were collected from each well in <br /> accordance with the site Well Sampling Protocol Samples were analyzed by Argon Laboratories <br /> (FLAP #1873) of Ceres, California for benzene, toluene, ethylbenzene, xylenes (BTEX), and <br /> methyl tert-butyl ether (MTBE) using EPA method 8020, and total petroleum hydrocarbons as <br /> gasoline (TPHg) using modified EPA method 8015 <br /> TPHg, BTEX, and MTBE were not present above laboratory method detection limits in well <br /> MW3 which is consistent with data collected during previous monitoring events TPHg was <br /> detected at concentrations of 210 and 380 parts per billion (ppb) in wells MW1 and MW2, <br /> respectively Benzene was detected at concentrations of 30 and 42 ppb, respectively <br />.� MTBE was detected at concentrations of 14 and 12 ppb in wells MW1 and MW2, respectively, <br /> which are below the State's recommended cleanup goal of 35 ppb Laboratory analytical data <br />