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'• Quarterly Report - Second Quarter 2003 ' GRANT LINE GAS & FOOD 2420 Grant Line Road, Tracy, California ' 1.0. INTRODUCTION ' At the request of Mr Joe Toste Jr, Advanced GeoEnvironmental, Inc (AGE), has prepared this quarterly report for field activities performed at 2420 Grant Line Road,Tracy, California during the second quarter 2003 The site setting is illustrated in Figure 1 Monitoring well and boring locations ' on the site are illustrated in Figure 2 A detailed summary of previous work performed at the site was presented in the AGE-prepared ' documents titled Quarterly Report-March 1996,dated 15 April 1996 and Quarterly Report-March 1999, dated 10 May 1999 Monitoring and sample data from January 1994 to the present are summarized in Tables 1 through 3 of this report 2.0. PROCEDURES ' This report is prepared in accordance with Central Valley Regional Water QualityControl Board ' (CVRWQCB)guidelines for investigation of underground storage tank(UST) sites The field work was conducted in accordance with San Joaquin County Environmental Health Department (EHD) guidelines for sampling ground water monitoring wells I 2 1 WELL MONITORING AND EVACUATION ' On 28 June 2003,the water levels in monitoring wells MW-1 through MW-8 were measured relative to the tops of the well casings using a Solmst water level meter After water levels were measured, ' wells MW-1 through MW-8 were evacuated(purged)utilizing adedicated,disposable plasticballer, approximately 125 to 5 25 gallons (a minimum of three casing-water volumes per well) of water were removed from each well Temperature, pH and conductivity of the purged ground water were measured at regular intervals using an Oakton water analyzer during purging,the measurements had stabilized by the end of the purging process Purged water was stored on-site in labeled 55-gallon, Department of Transportation (DOT)-approved drums Field logs are included in Appendix A 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Prior to collection of ground water samples, the depth to ground water was gauged in the purged wells to ensure that a minimum of 80%of the initial well volume had recharged Afterwards, water ' samples were collected from each well using the dedicated,disposable plastic bailer and transferred into three chilled 40-m1 volatile organic analysis (VOA)vials containing 0 5 ml 18%hydrochloric acid(HCl)as a sample preservative and into one 1-liter amber bottle without a sample preservative I Advanced GcoEnvuonmental Inc 1