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GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br /> May 13,2002 <br /> Ms Lon Duncan <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject Quarterly Groundwater Monitoring Report, I"Quarter 2002 <br /> 640 N El Dorado Street, Stockton, California <br /> Dear Ms Duncan <br /> Tlus letter report presents the results of the first quarter 2002 groundwater monitoring and sampling <br /> activities at the subject site(Figure 1) <br /> SITE ACTIVITIES <br /> • Activities at the site included removing free product from well MW3, re-surveying site wells pursuant to <br /> AB2886, monitoring water level elevations in all site wells, purging and sampling groundwater from site <br /> wells, and analyzing groundwater samples for oxygenated gasoline additives and volatile organic compounds <br /> (VOCs) <br /> FIELD WORK <br /> Free Product Measurement and Recovery <br /> A Ground Zero technician measured and removed free product from well MW3 on eleven separate <br /> occasions during the reporting period The thickness of measured product averaged 0 26 feet during <br /> the reporting period Approximately 5 9 gallons of product/water mixture was removed from well <br /> MW3 during the reporting period by manually bailing the product from the well, and transferring into <br /> 5-gallon drums The waste is being stored according to 49 CFR part 172 and 40 CFR part 262 Table <br /> 1 summarizes product thickness measurements and volume removed Field notes associated with <br /> product bailing, including a chart showing the decline in measured product thickness over time, are <br /> included in Attachment A <br /> Monitoring Well Survey <br /> Pursuant to AB 2886, all monitoring wells were surveyed by a Registered Surveyor to a horizontal <br /> accuracy of less than one meter and a vertical accuracy of 0 01 feet In January 2002, Morrow <br /> Surveying surveyed the latitude and longitude of the site wells relative to the North American Datum <br /> (NAD83), and surveyed the wellhead elevations relative to City of Stockton Benchmark No 27 A site <br /> map showing monitoring well locations, latitude and longitude coordinates and wellhead elevations is <br /> G1Data1GROUNDZBIGABBARDIrcports11QM2002 doc <br />