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' -Quarterly Report - Second Quarter 2002 GRANT LINE GAS & FOOD 5 ' 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 2002 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 1 2.0. PROCEDURES ' This report is prepared in accordance with Central Valley Regional Water Quality Control 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 ' 2 1 WELL MONITORING AND EVACUATION ' On 21 June 2002,the water levels in monitoring wells MW-1 through MW-8 were measured relative to the tops of the well casings using a Solxnst water level meter After water levels were measured, disposable plastic bailers were used to evacuate (purge) each well Approximately three to five ' 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 purgingprocess Purged water was stored on-site in labeled 55-gallon,Department of Transportation (DOT)-approved drums Field logs are included in Appendix A 1 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Prior to collection of ground water samples, the depth to ground water was gauged in each purged well to ensure that a minimum of 80% of the initial well volume had recharged Subsequently, a ' water sample was collected from each well using anew 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 Advanced GeoEnviron mental Inc