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Quarterly Report - July 1997 ' ART & ARTISTS 204 East Lodi Avenue,Lodi, California 1.0. INTRODUCTION ' In accordance with a request from Ms Mary Lehr,Advanced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for 204 East Lodi Avenue, Lodi, California Quarterly ground water monitoring activities were performed on 29 July 1997 Background information was summarized in the Closure Summary Report prepared by AGE in April 1997 The location of the site and its surroundings are illustrated in Figure I -Location Map Structures and well locations on the site are ' illustrated in Figure 2 - Site Plan The monitoring activities were performed in accordance with guidelines for investigation of underground storage tank (UST) sites established by the San Joaquin County - Public Health Services - Environmental Health Division (PHS-EHD) and by the Central Valley Regional Water Quality Control Board (CVRWQCB) 20 PROCEDURES '• 2 I MONITORING WELL PURGE PROCEDURES ' On 29 July 1997, a Solinst water level meter was used to measure the depth to ground water in each well,except MW-2,relative to the tap of each well casing The relative ground water elevations were calculated by subtracting the measured ground water depths from the surveyed casing elevations ' (Table 1) ' After recording the depth to ground water measurements, monitoring wells MW-1, MW-4, MW-5 and MW-6 were purged using a Grundfos purge pump Monitoring wells MW-3, MW-7 and MW-8 were purged using pre-cleaned PVC bailers A minimum of three well volumes of water was ' removed from each well Ground water stabilization parameters (temperature, pH and electrical conductivity) were measured during purging at regular intervals in each well using an ICM water analyzer Purged water was stored on-site in 55-gallon drums Stabilization data and field logs are ' included 1n Appendix A ' 22 COLLECTION OF GROUND WATER SAMPLES Prior to sampling, the depth to water was remeasured in each purged well to assure a minimum of ' 80% recharge Water samples were then collected from each purged well using new disposable • bailers The samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of ' 18%hydrochloric acid as a preservative and were transported in a chilled container, under chain-of- Ad+,anced GeoEnvironmenta1,Inc