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GROUND ZERO ANALYSIS, INC. <br /> 1714 Maw Street 2a�� <br /> Escalon,California 95320-1927TelePhone <br /> Facsunile(209)838-9M38 V1R�ti�t�1���1 V GAS <br /> p�RM1�IS`�R <br /> 1 <br /> June 17, 2004 <br />' Mr Jeff Wong <br /> San Joaquin County <br /> Environmental Health Department <br />' 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br />' Subject First Quarter 2004 Groundwater Monitoring and Sampling Report <br /> Speedy Mart, 8200 N Highway 99,Morada, CA <br />' Dear Mr Wong <br /> This Ietter report summarizes the First Quarter 2004 groundwater monitoring and sampling <br /> activities at the subject site Figure I presents a site vicinity map <br /> 1.0 SITE ACTIVITIES <br /> Activities at the site included operation and maintenance of an interim groundwater extraction and <br />' treatment system, conducting routine quarterly groundwater monitoring and sampling of site wells, <br /> collecting groundwater samples from nearby domestic wells, and analyzing groundwater and <br /> treatment system samples for appropriate constituents of concern <br /> 1 <br /> 2.0 INTERIM GROUNDWATER EXTRACTION AND TREATMENT SYSTEM <br />' The interim groundwater extraction and treatments stern generally operated continuously during the <br />' reporting period Approximately 163,463 gallons of water was treated during the reporting period A <br /> total of approximately 225,713 gallons of groundwater has been treated between November 2003 and <br /> March 30, 2004 During that period, approximately 44 pounds of petroleum hydrocarbons, including <br />' approximately 18 pounds of MTBE, were removed through the treatment system Treatment system <br /> flow data and maintenance notes through March 30, 2004 are summarized in Table 1 Analytical <br /> results of samples collected from the treatment system through March 30, 2004 are summarized in <br />' Table 2 The estimated mass removal is summarized in Table 3 Treatment system monitoring logs <br /> and laboratory reports are included in Attachments A and B, respectively <br />' G 1GROUNDZEITULEBURG\Reports\QMR1200311QM2004 doc <br />