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�. Quarterly Report Oc#ober 1.998 STRONG PROPERTY - ' 5157 West'Business Loop 205 Tracy, California . I.O. ' INTRODUCTION • . Advanced-GeoEnvironmental," Inc.. (AGE) .has prepared. this Quarterly Report for 51'.5.7 West' .. Business Loop 205, Tracy, California. The site setting is illustrated on Figure 1. Site structures and monitoring well,locations are depicted on Figure 2. The objective of the work was to monitor dissolved petroleum hydrocarbon cortcentrations in ground. ; water and to characterize ground water' flow direction and gradient on the site. This report is prepared•in accordance .with guidelines established,by the ,San Joaquin County Public Health Services - Environmental Health Division(PHS='EHD) and by,the Central Valley Regional Water IQuality Control Board (CVR%N,QCB) for investigation of underground storage tank (UST) sites. A summary of previous investigations at the site'was included .in the Preliminary-Evaluation And Investigation Report -July 1998, dated, 14 September 1998, prepared by AGE. 2.0. QUARTERLY MONITORING AND SAMPLING PROCEDURES 10 On lb October 1998, ground Ni7ater monitoring and sampling was performed at wells MW-l'through MW-4. MONITORING WELL PURGE PROCEDURES r. Depths to ground water were measured from the top of each well casing`at the-site to the nearest 0.01 foot.utilizing .a Sol inst water level meter. Ground water elevations in, each-well at the site were calculated by,subtracting'ili'e measured depth.to'ground water,from surveyed.casing elevations (Table 1). Ground•'water elevations were plotted and contoured on a scaled site map.(Figure 3). . After water levels were measured, approximately eight gallons of ground water(a minimum of three well volumes per'well) were removed from wells. MW-1. through MW-4 utilizing a,two-stage ;submersible pump; the .first t��ro gallons were removed utilizing a teflari bailer'.and new rope., P Temperature, pH and conductivity Nvere.measured.for stabilization at regular purge volume intervals I from each well using an IC.1\4 Model..52200.w' ater analyzer. Field data and logs are included with Appendix A. Purged ground nater Was containerized in 55-gallon drums and was stored on=site in an area lacking general.public'access. Advanced GeoEnvironmental„Inc.