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Quarterly Report - July 1998 <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 /> E_ (AGE) has prepared this Quarterly Report of field activities performed during the third quarter of <br /> 1998 at 1050 Elkhorn Drive, Stockton, California(the site). <br /> The scope of work included the installation of three soil vapor extraction wells and the installation <br /> of three air-sparging wells and the monitoring, purging and sampling of six monitoring wells and <br /> two in-situ air-sparging(IAS)wells on the site. The site and its surroundings are illustrated in Figure <br /> 1. Structures and ground water monitoring well locations on the site are depicted in Figure 2. <br /> =' The monitoring and sampling were performed in accordance with guidelines established by the <br /> Central Valley Regional Water Quality Control Board (CVRWQCB)and by the San Joaquin County <br /> Public Health.Services - Environmental Health Division(PHS-EHD) for subsurface investigation <br /> of underground storage tank sites. Site history and findings from previous investigations and <br /> monitoring events at the site are detailed in the Corrective Action Plan, 27 June 1996(CAP) and the <br /> Quarterly Reports -December 1996, dated 28 February 1997,prepared-by AGE. <br /> 2.0. PROCEDURES <br /> 2.1. MONITORING WELL PURGING <br /> -' On 07 July 1997,the depth to water in monitoring wells MW-1 through MW-6 and in air-sparging <br /> wells IAS-1 and IAS-2 was measured relative to the top of the well casings using a Solinst water <br /> level meter. After water levels were measured, approximately 10 gallons of water (a minimum of <br /> three well volumes) were removed from air-sparging wells IAS-1, IAS-2 and each ground water <br /> monitoring well using a submersible PVC pump. An ICM Model 52200 water analyzer was utilized <br /> to monitor temperature,pH and conductivity of purged water at regular purge volumes. Stabilization <br /> data and field logs are included in Appendix A.Purged ground water was containerized in 55-gallon <br /> 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 /> i 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 /> custody form,placed in a chilled container and transported to McCampbell Analytical, Inc. (MAI) <br /> Advanced GeoEnvironmental,Inc. <br />