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Quarterly Report - April 1997 ELKHORN COUNTRY CLUB 1050 Elkhorn Drive, Stockton, California IA. INTRODUCTION In accordance with a request from Mr. Bob Young of Elkhorn Country Club, Advanced GeoEnvironmental, Inc.; (AGE) has prepared this Quarterly Report of field activities performed ' during the second quarter of 1997 at 1050 Elkhorn Drive, Stockton, California (the site). The scope of work included monitoring,purging and sampling of each of the six monitoring wells on the site. . ` The site and its surroundings are illustrated in Figure 1 -Locution Ma Structures and round water 1' ! g g p� g r_ monitoring well locations on the site are depicted in Figure 2 -.Site Plan. The monitoring and sampling were performed in accordance with guidelines established by the.San Joaquin County Public Health Department-Environmental Health Division(PHS-EHD)and Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank sites. Site history and findings from previous investigations and monitoring events at the site are detailed in the Corrective Action Plan (CAP) and previous Quarterly Reports prepared f" by AGE. 2.0. PROCEDURES 2.1. MONITORING WELL PURGING I _ On 08 April 1997,the water level in monitoring wells MW-1 through MW-6 was measured relative to the top of the well casings using a Solinst water level meter. After water levels were measured, approximately 6 to 8 gallons of water(a minimum of three well volumes) were removed from each well using a submersible PVC pump. In accordance with the request of Mr. Steve Sasson with the PHS-EHD; four gallons of water were removed from air-sparging well VW-2 in preparation for sample collection. Temperature, pH and conductivity (stabilization data) were measured atone gallon intervals during purging using an ICM model 52200 water analyzer. Stabilization data and E;? field logs are included in Appendix A. Purged water was stored on-site in 55-gallon drums. 2.2. SAMPLE COLLECTION AND ANALYSIS E -- Water samples were collected from each well using new disposable plastic bailers. The. collected. .' samples were transferred into 40-m1 EPA-approved VOA vials. The samples were labeled, logged on a chain-of-custody fonri,placed in a chilled container and transported to McCampbell Analytical Inc., (MAI) in Pacheco, California. Each sample was analyzed in accordance with EPA methods 5030/8015m for total petroleum hydrocarbons quantified as gasoline (TPH-g), and in accordance with EPA methods 602 for volatile aromatics (benzene, toluene, ethyl benzene and xylenes: BTE&X) and methyl-tert-butyl ether (MTBE). 1