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ATG Associates, Inc Project No 99975 7501 <br /> ' GROUNDWATER MONITORING <br /> AND REMEDIATION STATUS REPORT -NO. 6 <br /> ' Second Quarter 1999 <br /> ' 151 South Main Street <br /> Manteca, California <br /> ' October 5, 1999 <br /> ' 1.0 INTRODUCTION <br /> This report has been prepared on behalf of Value Reclamation Corporation by ATC Associates, <br /> Inc (ATC) <br /> ' The purpose of this report is to fulfill quarterly monitoring requirements by the San Joaquin <br /> County Public Health Services(SJCPHS),to maintain a groundwater monitoring history for the <br /> N site and to present data addressing the status and effectiveness of the soil and groundwater <br /> remediation program implemented at the site Included in this report are the results of the latest <br /> groundwater monitoring event conducted in July 1998 Section 2 0 presents the groundwater <br /> sampling procedures Section 3 0 presents the analytical results and water level measurements <br /> for this monitoring period, and Section 4 0 addresses the remediation program <br /> ' 2.0 GROUNDWATER SAMPLING PROCEDURES <br /> The locations of the groundwater monitoring wells and other relevant features are shown on <br /> tFigure 2 Table I summarizes the construction details for all monitoring and co-extraction wells <br /> related to the site investigation <br /> ' Following groundwater level measurements, groundwater samples were collected on July 8, <br /> 1999 The following protocol was used in obtaining groundwater samples <br /> ' Before purging, water levels were measured with an electronic interface tape capable of <br /> measuring the static water level and Hydrocarbon product/water interface in one immersion <br /> ' Before sampling, the wells were purged to replace stagnant water in the well with fresh <br /> aquifer water The wells were purged using either an air diaphragm or submersible pump <br /> All wells were purged until dry or until four well-volumes of groundwater were removed <br /> ' The purged water was monitored for temperature, pH and conductivity Purging was <br /> considered complete when these parameters had stabilized When possible, the wells were <br /> sampled after 80 percent or greater recovery Turbidity, dissolved oxygen and oxidation- <br /> Groundwater Monitoring and Remediation Status Report Page 1 <br /> 1 <br />