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I <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone (209)838-9888 <br /> Facsimile (209)838-9883 <br />' August 18, 2004 <br />' Mr Jeff Wong <br /> San Joaquin County -Z U <br /> Environmental Health Department <br />' 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br />' Subject Quarterly Groundwater Monitoring Report,April through June 2004 <br /> Including Groundwater Treatment System Status <br /> And Installation of Monitoring Wells MW15 and MW16 <br />' Speedy Mart, 8200 N Highway 99, Morada, CA <br /> Dear Mr Wong ' <br /> This letter report summarizes the Second Quarter 2004 groundwater monitoring, sampling, and <br />' remediation activities at the subject site Figure 1 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 <br /> wells, collecting groundwater samples from nearby domestic wells, analyzing groundwater and <br /> treatment system samples for appropriate constituents of concern, and installation of two new <br />' groundwater monitoring wells <br /> i <br /> I <br />' 2.0 INTERIM GROUNDWATER EXTRACTION AND TREATMENT SYSTEM <br /> The interim groundwater extraction and treatment system generally operated continuously during <br />' the reporting period Approximately 100,149 gallons of water was treated during the reporting <br /> period A total of approximately 325,862 gallons of groundwater has been treated between <br /> November 2003 and June 28, 2004 During that period, approximately 57 pounds of petroleum <br /> hydrocarbons, including approximately 21 pounds of MTBE, were removed through the treatment <br /> system Treatment system flow data and maintenance notes through June 30, 2004 are summarized <br /> in Table 1 Analytical results of samples collected from the treatment system through June 30, <br /> G IGROUNOZEITULEBURG1Repo11slQMR1200412QM2004 dor- <br />