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PM ;., Quarterly Report - July to December 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 final quarters of a 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 and installation of an SVE/IAS network system. The site and its surroundings are illustrated in Figure 1. 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 Corrective Action Plan - 27 June 1996 (CAP) and in r_ Quarterly Report- December 1996, dated 28 February 1997,prepared by AGE. 2.0. PROCEDURES Monitoring and sampling were performed in accordance with guidelines established by the Central Valley Regional Water Quality Control Board (CVRW CB)and by the San Joaquin CountyPublic v"J Health Services - Environmental Health Division (PHS-EHD) for subsurface investigation of underground storage tank sites. Additionally the scope of work was performed in accordance with I- ! the PHS-EHD approved Remedial Action Work Plan Addendum for corrective action prepared by AGE, dated 14 January 1998. 2.1. SOIL VAPOR EXTRACTION SYSTEM INSTALLATION l On 01 and 02 July setup of the extraction system and installation of the power supplies were initiated. Installation of the supplemental fuel source (propane) installation was completed on 01 September 1997. AGE installed a subsurface piping network at the site consisted of schedule 40 PVC piping from the SVE vapor wells(VW-1 through VW-5)and the IAS wells(VW-1,VW-2 and IAS-1 through IAS-4) to the remediation unit. The piping was placed in a trench approximately 5 to 6 inches in depth and was covered with sand;road base was then applied over the trenching to match the existing surface. The piping was routed through a moisture knockout drum to a VACLEEN 1000 SVE system, manufactured by Environmental Techniques. The VACLEEN unit consists of a positive- displacement blower rated at 100 cubic feet/minute (cfln) and a regenerative blower driven by an internal combustion(IC)engine. Propane was used as a supplemental fuel source to start the engine ' and maintain its operation. Hydrocarbon vapor was destroyed as part of the internal combustion process. Emissions from the engine were routed through two catalytic converters to maximize the Advanced GeoEnvironmental,Inc. I