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-; Quarterly Report - February 1998 ELKHORN COUNTRY CLUB 1050 Elkhorn Drive, Stockton, California 1.0. INTRODUCTION In accordance with a request from Mr. Bob. Young of Elkhorn Country Club, Advanced 'i GeoEnvironmental, Inc., (AGE) has prepared this Quarterly Report of field activities performed during the first quarter of 1998 at 1050 Elkhorn Drive, Stockton, California (the site). The scope of work included monitoring,purging and sampling of six monitoring wells and two air-sparging well on the site. The site and its surroundings are illustrated in Figure 1 -Location Map. Structures and ground water monitoring well locations on the site are depicted in Figure 2 - Sile Plan. The monitoring and sampling were performed in accordance with guidelines established by the San Joaquin County Public Health Departmeni-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, 27 June 1996 (CAP) and previous Quarterly Reports prepared by AGE. .r, 2.0. PROCEDURES 2.1. MONITORING WELL PURGING On 27 February 1997, the water level in monitoring wells MW-1 through MW-6 and 'both air- sparging wells was measured relative to the top of the well casings using a Solinst water level meter. After water levels were measured, approximately six gallons of water (a minimum of tluee well volumes) were removed from air-sparging wells VW-1, VW-2 and each ground water monitoring well using a submersible PVC pump. Purged water was stored on-site in 55-gallon drums. _; 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 40-m1 EPA-approved VOA vials. The samples were labeled, logged on a chain-of-custody form, placed in a chilled container and transported to McCampbell Analytical, Inc. (MAI) in Pacheco, California. Each sample was analyzed in accordance with: • EPA method 5030/8015m for total petroleum hydrocarbons quantified as gasoline (TPH=g) • EPA method 8020 for volatile aromatics (benzene, toluene, ethyl benzene and xylenes: Advanced GeAnvironmcnlal,Inc.