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• Quarterly Report - April 1998 Den's Auto Repair 308 South El Dorado Street, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr Den Ueda, Adi,anced GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for Den's Auto Repair at 308 South El Dorado Street, Stockton, California The scope of work included the collection and analysis of soil and ground water samples from three dual-completed ground water monitoring wells The site and Its surroundings are illustrated on Figure 1 -Location Map Locations of structures and monitoring wells on the site are illustrated on Figure 2 - Site Plan The work was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board guidelines for Investigation of underground storage tank (UST) sites Background information Including details of previous site assessment work, was presented in the Prehnnnary Imestigation and Evaluation Report (PIER) dated September 1997, prepared by AGE 2.0. PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 09 April 1998, a Solinst water level meter was used to measure the depth to ground water in each well relative to the tops of the well casings After ground water depth measurements were collected, each monitoring well was purged using a two-stage submersible pump Approximately 8 to 10 gallons of water (minimum of 3 well volumes per well) were evacuated from the shallow-screened casings and 20 gallons of water were from the deep- screened casings of the wells MW-1(AIB) through MW- 3(A/B) Temperature, pH and conductivity of the purging water were measured at 2-gallon or 4-gallon Intervals, as appropriate, using an ICM Model 52200 Water Analyzer to monitor these ground water parameters for stabilization Stabilization data and field logs are included in Appendix A Purged water was stored In 55-gallon drums temporarily on-site 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using new disposable bailers The samples were transferred into 40-m1 EPA-approved vials containing 0 5 ml 18% hydrochloric acid as a preservative The samples were transported in a chilled container, under chain of custody, to McCampbell Analytical, Inc, a state-certified laboratory, for analytical analysis The samples were Ads arced GetsEm it otunrnl d,Inc