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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Es-alon, California 95320-1927 <br /> Telephone (209) 838-9888 <br /> FaLslin le (209)838-9883 �1] <br /> J AN 2 5 zon <br /> January 21, 2002 BPERWTISERVICES " <br /> Mr Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Fourth Quarter Groundwater Monitoring and Sampling Report, <br /> Speedy Mart, 8200 N 1-hghway 99, Morada, CA <br /> Dear Mr Wong <br /> This letter report summarizes the Fourth Quarter 2001 groundwater monitoring and sampling activities at <br /> the subject site (Figure 1) <br /> 1 0 SITE ACTIVITIES <br /> Activities at the site included removing free product from well MW 1, monitoring groundwater levels in all <br /> site wells, and purging and sampling groundwater from site wells Groundwater samples were analyzed <br /> for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX), and oxygenated gasoline additives including the Iead scavengers 1,2-dichloroethane (1,2-DCA) <br /> and ethylene dibromide(EDB) <br /> 2 0 FIELD WORK <br /> 2.1 Free Product Measurement and Recovery <br /> As an interim remedial action, Ground Zero is actively bailing product from well MW1 Since August 16, <br /> 2001, a total of approximately 38 gallons of product/water mixture has been extracted by manually bailing <br /> the well and transferring the liquid into a Department of Transportation (DOT) approved storage <br /> container From October 12, through December 18, 2001, a Ground Zero technician measured free <br /> product thickness and removed approximately 15 gallons of product/water mixture from well MW 1 The <br /> average product thickness during the quarter was 0 15 feet, a reduction from the previous quarter when <br /> the average product thickness wa 0 97 feet The waste is being managed pursuant to 49 CFR part 172 <br /> and 40 CFR part 262 Table 1 summarizes product thickness measurements and volumes removed Field <br /> notes are included in Attachment A <br /> G 1Dzta1Gi2GUNDzE1TULEBURG\ReportslQMR14QM2001 doc <br />