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V <br /> r <br /> k , Quarterly Report - First Quarter 2006 <br /> NATIONAL FREIGHT <br /> ' 2850 Loomis Road, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr Daniel Folcher of Vineland Construction Co ,Advanced GeoEnvironmental, <br /> Inc (AGE) has prepared this report of environmental activities conducted at 2850 Loomis Road, <br /> Stockton,California(site) The scope of work included the monitoring and sampling of four ground .,t ails <br /> water monitoring wells, analysis of the ground water samples, and preparation of this report The f41R1 <br /> location of the site and surrounding area are illustrated on Figure 1 On-site structures and the v�askN <br /> locations of monitoring wells are illustrated on Figure 2 <br /> ' Site background information can be found in the AGE-prepared Preliminary Investigation and <br /> Evaluation Report, dated 12 October 1999, and Additional Site Assessment Report, dated 09 April <br /> ' 2002 <br /> 2.0. PROCEDURES <br /> Field procedures were performed in accordance with Central Valley Regional Water Quality Control <br /> ' • Board(CVRWQCB) guidelines for the investigation of underground storage tank(UST) sites and <br /> San Joaquin County Environmental Health Department(EHD)guidelines for the sampling ofground <br /> water monitoring wells The procedures were performed in accordance with the AGE-prepared and <br /> ' EI-ID-approved Monitoring Well Installation Work Plan, dated 09 June 2000 <br /> ' 2 1 WELL MONITORING AND PURGING <br /> ' On 27 February 2006, the depth to ground water in monitoring wells MW-1 through MW-4 were <br /> measured from the top of each well casing to the nearest 0 01-foot utilizing a Solinst water level <br /> meter The area aroun^mtoring well MW-5 was flooded and was inaccessible this quarter The <br /> ground water elevation in each well was calculated by subtracting the measured depth to ground <br /> ' water from the surveyed casing elevation(Table 1) <br /> ' After water levels were measured, 5 25 to 6 gallons of water (a minimum of three casing water <br /> volumes per well) were purged from the three wells using a Waterra Hydro-Lift II pump equipped <br /> with a mechanical arm utilized to surge each well with dedicated tubing Ground water temperature, <br /> �v pH, and conductivity were measured at regular intervals during purging using an Oakton water <br /> T analyzer Field sheets and data are included m'Appendix A Purged'water was stored on-site in <br /> properly labeled, Department of Transportation (DOT)-approved 55-gallon drums pending proper <br />' disposal <br /> • <br /> V Advanced GeoEnvironmentai,Inc <br />