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1 <br /> Quarterly Groundwater Monitonng Report No 1 November 3, 1997 <br /> 1 <br /> • were purged until dry or until four well-volumes of groundwater were removed The purged <br />' water was monitored for temperature, pH, and conductivity Purging was considered <br /> complete when these parameters had stabilized When possible,the wells were sampled after <br /> 80 percent or greater recovery Turbidity, dissolved oxygen, and oxidation-reduction <br /> potential of the samples were also measured Appendix A contains copies of the <br /> Purge/Sampling Worksheets <br /> • To minimize potential cross-contammation between wells, all measuring, purging, and <br /> sampling equipment was washed in a non-phosphate detergent solution, rinsed with tap <br />' water, and then rinsed with distilled water prior to sampling each well <br /> • The sampling procedures for each monitoring well consisted of extracting well water with <br /> ' a clean TeflonTm bailer attached to a clean nylon cord Water collected for analysis of TPHg <br /> and BTEX was decanted into 40-milliliter glass vials with TeflonTM-lined septa The <br /> samples were preserved with hydrochloric acid and acidified to a pH of approximately 2 0 <br /> ' All samples were labeled and placed in a refrigerated cooler with the chain-of-custody <br /> document Samples transported to the laboratory were analyzed within the specified holding <br /> time Samples stored overnight at On-Site Technologies,Inc (OST) were refrigerated at a <br /> temperature of approximately 4°Celsius <br /> , . The groundwater samples were analyzed for TPHg utilizing EPA Method 8015M and for <br /> BTEX and MTBE utilizing EPA Test Method 8020 One trip blank was submitted with the <br /> samples for analytical quality control <br /> Groundwater produced during purging and sampling was contained in 55-gallon dramsand <br /> temporarily stored at the site <br /> 3.0 PROGRESS REPORT <br /> 1 <br /> This section presents a summary of the progress made during the reporting period of July <br /> ' through September 1997 <br /> On July 23, 1997, the Corrective Action Plan, Implementation of Soil/Groundwater <br /> ' Remediation, former Diamond Lumber Site, 151 South Main Street, Manteca, California(CAP) <br /> report was submitted to the SJCPHS This report recommended installation of a soil vapor and <br /> ' groundwater co-extraction system to initiate site remediation On August 19, 1997,the SJCPHS <br /> reviewed the CAP and stated that the submitted report did not meet the SJCPHS criteria for a <br /> CAP, however, the SJCPHS did approve the co-extraction system as an interim corrective <br /> ' action <br /> ' OST <br /> 701-1-2 qml Page 2 <br />