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` Quarterly Report- January 1999 ELKHORN COUNTRY CLUB 1050 Elkhorn Drive, Stockton, California 1.0. INTRODUCTION At the request of Mr. Bob Young of Elkhorn Country Club, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Quarterly Report of field activities performed during the first quarter of 1999 at 1050 Elkhorn Drive, Stockton, California(the site). The scope of work included monitoring,purging and sampling of six monitoring wells and two in- situ air-sparging (IAS) wells on the site. The site and its surroundings are illustrated in Figure 1. E Structures and ground water monitoring well locations on the site are depicted in Figure 2. Site history and findings from previous investigations and monitoring events at the site are detailed in the Corrective Action Plan, 27 June 1996(CAP) and the Quarterly Reports- December 1996,dated i ' 28 February 1997,prepared by AGE. Monitoring and sampling were performed in accordance with guidelines established by the Central i Valley Regional Water Quality Control Board(CVRWQCB) and by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for subsurface investigation of underground storage tank sites. 2.0. PROCEDURES 2.1. MONITORING WELL PURGING On January 22, the depth to water in monitoring wells MW-1 through MW-6 and in air-sparging. wells IAS-1 and IAS-2 was measured relative to the top of the well casings using a Solinst water level meter. After water Ievels were measured, approximately 8 gallons of water (a minimum of three well volumes) were removed from air-sparging wells IAS-1, IAS-2 and from each ground water monitoring well using a submersible PVC pump. An ICM Model 52200 water analyzer was utilized to monitor temperature, pH and conductivity of purged water at regular purge volumes. Stabilization data and field logs are included in Appendix A. Purged ground water was containerized in 55-gallon drums and stored on-site. 2.2. SAMPLE COLLECTION AND ANALYSIS Water samples were collected from the purged wells using new disposable plastic bailers. The collected samples were transferred into EPA-approved 40-m1 VOA vials containing 0.5 milliliters hydrochloric acid(18%) as a sample preservative. The samples were labeled, Iogged on a chain-of- custody form,placed in a chilled container and transported to McCarnpbell Analytical, Inc. (MAI) Advanced GcoEnvironmental,Inc.