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e - <br /> ' Quarterly Report - Third and Fourth Quarters 2005 <br /> . CHAPIN BROTHERS INVESTMENTS, INC. <br /> ' 1766 Monte Diablo Avenue, Stockton,California <br /> ' 1.0. INTRODUCTION <br /> At the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> report for the site located at 1766 Monte Diablo Avenue, Stockton, California This report <br /> documents the third and fourth quarter 2005 ground water monitoring events The site setting is <br /> illustrated in Figure 1 Structures and well locations on or near the site are illustrated in Figure 2 <br /> ' Background information and a description of prior investigations at the site are included in the <br /> Appendix A Quarterly monitoring well data from January 1994 to the present is summarized in <br /> ' Tables 1 and 2 in this report <br /> r2.0 PROCEDURES <br /> ' All field work was performed in accordance with Central Valley Regional Water Quality Control <br /> Board(CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites <br /> t Ground water sampling procedures for monitored natural attenuation (MNA) parameters was <br /> outlined in Ground Water Monitoring- Natural Attenuation Work Plan dated 21 March 2005 and <br /> Ground Water Sampling and Monitoring Natural Attenuation Work Plan Addendum dated 12 April <br /> ' 2005,approved by the San Joaquin County Environmental Health Department(EHD)by letter dated <br /> 18 April 2005 Ground water monitoring activities were performed in accordance with guidelines <br /> established by the EHD and the CVRWQCB <br /> 21 QUARTERLY GROUND WATER MONITORING AND SAMPLING <br /> ' Quarterly ground water monitoring and sampling events were performed on monitoring wells MW-1 <br /> through MW-6,vapor wells VE-1,VE-6 and ground water extraction wells EW-1,EW-2 and EW-3 <br /> ' on 10 August 2005 and 25 October 2005 <br /> 2 1 1 Low-Flow Well Monitoring and Ground Water Sample Collection and Analysis <br /> 1 On 10 August and 25 October 2005 a Solinst water level meter was used to measure the depth to <br /> ground monitoring water in the wells relative to the tops of the well casings(Table 1) Subsequently, <br /> the ground water elevation in each well was calculated by subtracting the measured depth to ground <br /> ' water from the surveyed casing elevation After water levels were measured, ground water was <br /> purged at a rate of approximately 500-m1 per minute from ten wells utilizing low-flow technology <br /> • A peristaltic pump and disposable tubing was lowered to a depth of 20 feet below casing,and ground <br /> ' Advanced GeoEnvironmcntal,Inc <br /> s <br /> 1 <br />