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Quarterly Report - October 1997 6, ARCO MINI-MART 4511 Pacific Avenue, Stockton, California 10. INTRODUCTION AND SCOPE OF WORK In accordance with the request of Mr Art Wyatt, Advanced GeoEnviroiunental, Inc , (AGE) has prepared this Quarterly Report for the site located at 4511 Pacific Avenue, Stockton, California (the site) The location of the site is illustrated in Figure 1 - Location illap Structures, monitoring well ' and soil boring locations are illustrated in Figure 2 - Site Plan Site history and a description of previous ,N ork performed at the site were detailed in Quarte?ly ' Repos t - Mar ch 1996, dated 30 April 1996 prepared by AGE The scope of work was to monitor and sample ground water at the site Monitoring was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional N� ater Quality Contiol Board (CVRWQCB) guidelines for investigations of underground storage tank (UST) sites In addition to the routine analyses ran Ifor quarteily monitoring events selected ground water samples were analyzed for manganese and iron content, and for bio-enumeration and ph,,sicochenlical analysis During this quarter, AGE prepared a letter dated 13 November 1997, addressed to the PHS-EHD requesting approval of the �Nork plan addendum dated 08 October 1997 in oider to begin interim remediation and curtail the miQralion of hydiocarbons off-site The PHS-EHD could not approved the request at this tone due to the lack of a demonstrable immediate threat to drinking eater posed by the migrating hydrocarbons A reN ised NNork plan is in preparation 20 PROCEDURES ' 2 1 MONITORING WELL PURGE PROCEDURES ' On 30 October 1997 a Solinst v ater level meter was used to measure the depth to ground water in each well relative to the top of the well casings After ground «rater depth measurements were collected, monitoring wells IMV-1 through NNW-7 and vapor well VW-1 were purged using a PVC Siihnrersible numn Approximate ly IS to 18 oal Ions of wnti-r werr- evacuated from monitoring wt,-11-, MW-1 through MW-3 and approximately 6 to 8 gallons of water were evacuated from monitoring ' wells MW-4 through MW-7 Ten gallons �,Nere removed from vapor, well VW-1 Temperatuie, pH and conductivity of purged NN ater (ground v,ater stabilization data) were measured at 2-gallon and 3-gallon intervals dependina, on total piiroc -,nhime� icing an 1CM rnorlel 5704 -,rater analyzPi The ground water stabilization data and field logs are included in Appendix A Adm arced GmEnN ironmental Inc