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QUARTERLY REPORT <br /> August 1996 <br /> Former CHASE CHEVROLET (Van Buren) Facility <br /> 424 North Van Buren Street <br /> IStockton, California <br /> 10 INTRODUCTION <br /> In accordance with a request from Mr Jeffery Setness of Hartmann & Setness, Advanced <br /> GeoErivlronnlental, Inc (AGE) has prepa7 ed this Quarterly Report summarizing field activities <br /> performed during the second and third quarters of 1996 at 424 North Van Buren Street, Stockton, <br /> California (Figure 1 - Location Map) Structures and monitoring well locations on the site and <br /> adjacent area are illustrated in Figure 2 - Vicinity Map <br /> Field activities were performed in accordance with guidelines for investigation of underground <br /> tstorage tank (UST) sites established by both the Cential Valley Regional Water Quality Control <br /> Board (CVRWQCB) and the San Joaquin County Public Health Services - Environmental Health <br /> Division (PHS-EHD) Background information was summarized in the February 1996 Quarterly <br /> Report prepared by AGE <br /> 20 PROCEDURES <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 07 May and 07 August 1996 a Solinst water level meter was used to measure the depth to <br /> ground water in each well relative to the tops of the well casings An Ullage interface probe was used <br /> to check for the presence of free product in MW-3 and MW-9 The relative ground eater elevations <br /> and hydraulic gradient were determined from these data (Table 1) <br /> On 08 May August and 08 g st 1996, each monitoring well was purged using a 2-stage submersible <br /> purge pump Well MW-3 was not purged during the May 1996 momtoinlg due to the presence of <br /> free product The pump was decontaminated prior to purging each well using an Alconox solution <br /> and clean tap water Temperature, pH and conductivity were measured at regular intervals during <br /> the puigtng process on 08 May 1996, using an ICM model 52200 water analyzer These ground <br /> water parameters stabilized during purging Seven to twelve gallons of water(minimum of three well <br /> volumes) were removed from each well Fifty gallons of water was purged from MW-9 Due to <br /> equipment malfiuiction, ground water parameter data was not measured for the August monitoring <br /> During the August ground water monitoring event, nine to fifteen gallons of water (approximately <br /> four well volumes)were removed from each well, except for the fifty-five gallons of water removed <br /> from MW-9 All purged water was stored in 55-gallon DOT drums on-site Stabilization data and <br /> field logs are included in Appendix A <br /> I <br />