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Quarterly Report - October 1999 <br /> RIPON FARM SERVICE <br /> 22871 South Highway 99, Ripon, California <br /> ' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> At the request of Allan Fetters,Advanced GeoEnvironmental, Inc (AGE) has prepared this report <br /> for ground water monitoring and sampling activities conducted at 22871 South Highway 99, Ripon, <br /> California (the site) <br /> ' This report documents the sampling activities performed at the site on 15 October 1999 and presents <br /> results of laboratory analysis of the samples collected The objective of the work was to monitor <br /> ' ground water conditions and concentrations of dissolved petroleum hydrocarbons and selected fuel <br /> additives in ground water at the site The location of the site and its surroundings are illustrated in <br /> Figure 1 Structures and monitoring well locations associated with the site are depicted in Figure 2 <br /> Background Information, including details of previous site assessment work, was presented in the <br /> April 1996 Quarterly Report prepared by AGE, dated 20 June 1996 <br /> 1 <br /> 20. PROCEDURES <br /> Monitoring and sampling activities were conducted in accordance with both the San Joaquin County <br /> Public Health Services - Environmental Health Division (PHS-EHD) and the Central Valley <br /> tRegional Water Quality Control Board (CVRWQCB) guidelines for the investigation of <br /> underground storage tank (UST) sites <br /> 21 MONITORING WELL PURGE PROCEDURES <br /> ' On 15 October 1999, a Solinst water level meter was used to measure the depth to ground water in <br /> wells MW-1 through MW-8, VW-IA/B and VW-2AIB Wells VW-lA and VW-2A are soil vapor <br /> ' extraction wells with screened intervals between 5 and 20 feet below surface grade (bsg), VW-I B <br /> and VW-2B are air sparging wells with screened intervals between 30 and 35 feet bsg The depths <br /> to ground water are summarized in Table 1 <br /> ' After ground water depth measurements were recorded, a minimum of three well-volumes of ground <br /> water purged from wells MW-1 through MW-8 and VW-IB and VW-2B All wells were purged <br /> using a pre-cleaned, two-stage submersible pump SVE wells VW-IA and VW-2A were purged <br /> using a clean PVC bailer <br /> ' Monitoring wells MW-I through MW-5 were each purged of approximately 9 gallons of water,wells <br /> MW-6 through MW-8 were each purged of approximately 6 gallons of water Approximately 9 <br /> gallons of water were removed from wells VW-I B and VW-213, and 1 gallon of water was removed <br /> Advanced GeoEnvironmental,Inc <br />