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rff ,, Quarterly Report - April 1999 <br /> f <br /> ELKHORN COUNTRY CLUB <br /> 1050 Elkhorn Drive, Stockton, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Bob Young of Elkhorn Country Club, Advanced GeoEnvironmental, Inc. <br /> (AGE)has prepared this Quarterly Report of field activities performed during the second quarter of <br /> 1999 at 1050 Elkhorn Drive, Stockton, California(the site). <br /> The scope of work included monitoring, purging and sampling of six monitoring wells and two in- <br /> situ air-sparging (IAS) wells on the site. The site and its surroundings are illustrated in Figure 1. <br /> Structures and.ground water monitoring well locations on the site are depicted in Figure 2. Site <br /> =: history and findings from previous investigations and monitoring events at the site are detailed in <br /> Corrective Action Plan -27 June 1996(CAP) and in Quarterly Report- December 1996,dated 28 <br /> February 1997, prepared by AGE. <br /> 2.0. PROCEDURES <br /> i <br /> , ' .. Monitoring and sampling were performed in accordance with guidelines established by the Central <br /> Valley Regional Water Quality Control Board (CVRWQCB)and by the San Joaquin County Public <br /> Health Services - Environmental Health Division (PHS-EHD) for subsurface investigation of <br /> underground storage tank sites. <br /> 2.1. MONITORING WELL PURGING <br /> On 27 April 1999, the depth to ground water in monitoring wells MW-1 through MW-6 and in air- <br /> .>.i sparging wells IAS-1 and IAS-2 was measured relative to the top of the well casings using a Solinst <br /> water level meter. After water levels were measured, approximately 10 gallons of water(a minimum <br /> of three well volumes) were removed from air-sparging wells IAS-1, IAS-2 and from each ground <br /> water monitoring well using a submersible PVC pump. An ICM Model 52200 water analyzer was <br /> -'-+ utilized to monitor temperature, pH and conductivity of purged water at regular purge-volume <br /> intervals. Stabilization data and field logs are included in Appendix A. Purged groundwater was <br /> containerized in 55-gallon drums and stored on-site. <br /> 2.2. SAMPLE COLLECTION AND ANALYSIS <br /> Water samples were collected from the purged wells using new disposable plastic bailers. The <br /> collected samples were transferred into EPA-approved 40-m1 VOA vials containing 0.5 milliliters. <br /> hydrochloric acid (18%)as a sample preservative. The samples were labeled, logged on a chain-of- <br /> Advanced GeoEnvironmental,Inc. <br /> .. l <br />