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a k, Quarterly Report - February 1998 - NOMELLINI CONSTRUCTION CO. ' _ } 1045 West Charter Way Stockton, California 10. INTRODUCTION A '! In accordance with a request from Mr Dante John Nomellini of Nomellini Construction Co Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for 1045 West Charter Way, Stockton, California The location of the site and the immediately surrounding area are ' 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 concentrations 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 Seivices - ' Enviromnental Health Division (PHS-EHD) and the Central Valley Regional Water Quality Control, Board (CVRWQCB) for investigation of underground storage tank (UST) sites A summary of precious investigations at the site was included in the Quarterly Repui t - Februa?y 1996, dated 17 ' May 1996, prepared by AGE J j A iv r i k 20. PROCEDURES 21 _ i MONITORING WELL PURGE PROCEDURES On 25 February 1998,the depth to ground water in each monitoring well was measured to the nearest 0 01 foot utilizing a Solist water level meter Ground water elevations frons MW-1 through MW-9 were then calculated,by subtracting the measured depth to ground water from the surveyed casing elevations (Table 1) Ground water elevations were plotted and contoured on a scaled site snap (Figure 3) After water levels were measured, approximately twelve to eighteen gallons (minimuin'of three well - volumes per well) of water were purged from wells MW-1 through MW-9 utilizing a two-stage submersible pump Temperature,'pH and conductivity were measured at regular intervals from each well using an ICM Model 52200 water analyzer, to monitor for stabilization of these characteristics ' during purging Dissolved oxygen was measured in water purged from each monitoring well using a YSI,Mode155 Dissolved Oxygen Meter following stabilization of the produced water Stabilization 41 data 'and field logs are included with Appendix A, dissolved oxygen field measurements are Iv summarized in Table"2 Purged ground water was containerized in 55-gallon drums and stored on- site'in an area lackmgigeneraltpublic access E Advmrced CcoEmironmental,Inc