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Soil Vapor Assessment Work Plan RIPON FARM SERVICE 932 East Frontage Road, South Highway 99,Ripon, California 1.0. INTRODUCTION At the request of Ripon Farm Service(RFS),Advanced GeoEnvironmental,Inc.(AGE)has prepared this Soil VaporAssessment WorkPlan for additional groundwater investigation at 932 East Frontage Road, South Highway 99,Ripon,California(the site).The scope of work includes the advancement of three soil borings to evaluate hydrocarbon-impacted soil vapor. If additional soil borings are required, AGE willc nfirm boring and/or well locations and construction details with representatives oftheor to drilling. The location of the site is illustrated on Figure 1. A plan of the site and the proposed boring locations are depicted on Figure 2. This work plan is prepared in response to a San Joaquin County Environmental Health Department (EHD) letter dated 20 June 2008 and electronic mail dated 16 July 2008 (Appendix A). The Work Plan is prepared in accordance with the Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tank(UST) sites. 1.1. REMEDIATION PROGRESS Between December 2000 and December 2003, a soil-vapor extraction (SVE)unit was operational at the site.An in-situ air-sparge(IAS) system was installed at the site in August 200 1. Operation of the SVE unit at the site ceased in January2004 and soil-vapor samples collected from the monitoring events during the fourth quarter of 2003 were absent of detectable hydrocarbons,therefore SVE was not restarted. As a result of the remediation, dissolved hydrocarbon concentrations declined below detection limits in most of the wells and remain below the highest concentrations detected at the site. a 1.2. POST REMEDIATION SOIL SAMPLE COLLECTION AND GRAB GROUND WATER SAMPLE COLLECTION On 14, 15 and 17 October 2003, five soil probe borings(CB-1 through CB-5)were advanced at the site. Probe boring CB-1 was advanced adjacent to monitoring well MW-1; CB-2 was advanced adjacent to boring 134; boring CB-3 was advanced between vapor wells VW-1 and VW-11; boring CB-4 was advanced between boring B4,vapor wells VW-3,VW-1 and air-sparging well IAS 1;and boring CB-5 was advanced adjacent to the north property boundary,between well MW-2 and vapor well VW-7.Probe borings were advanced to a total depth of 45 feet bsg;a grab ground water sample was collected from each boring at 40 feet to 45 feet bsg, except at CB-3. Soil samples were collected from the probe borings at 5-foot intervals, starting at 5 feet bsg,using a Geoprobe soil sampling device.Confirmation borings CB-1,CB-2,CB-4,and CB-5 were sampled for ground water. A total of thirty-six soil samples were analyzed for TPH-g, TPH-d, BTEX, and Advanced GeoEnvironmental,Inc.