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REMEDIATION TESTING AND DESIGN July 1, 1993 INTRODUCTION At the request of Ultramar, Inc . (Ultramar) , Remediation Testing and Design (RTD) conducted a soil gas screening (SGS) and limited vacuum extraction feasibility test (VEFT) on June 8, 1993 at Beacon Station #513 located at 401 West Kettleman Lane in Lodi, San Joaquin County, California. Figure 1 shows the general location of the site . The testing was conducted to determine if there are any shallow subsurface hydrocarbon impacts to soils located near the present underground storage tank (UST) , and pump dispenser system and associated piping, and to determine the effectiveness of using vacuum extraction as a remediation option for soils . This report includes a brief description of the subject site and presents the procedures, results, and conclusions of the field testing. BACKGROUND The site is located in the Central Valley approximately 35 miles south of Sacramento in Lodi, California. The station property contains three 12 , 000-thousand gallon USTs . There are no monitor or vadose wells on-site . PROCEDURES Soil Gas Screening A SGS was conducted using sixteen temporary vapor probes installed for the investigation. In order to install the vapor probes, a permit from San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) was issued on the behalf of RTD and Ultramar. A copy of the permit and all regulatory correspondence is contained in Appendix A. Figure 2 is a detailed site plan showing the location of the probes . The vapor probes are constructed of 3/4-inch diameter, schedule-80, carbon steel pipe . Each probe contains a 36-inch range of drilled perforations at one end with a forged drive point . All probes were steam cleaned prior to transport to the site . The probes were installed using a pneumatic drive hammer to total depths ranging from 15 to 20-feet below grade, with the exception of probes P-2 and P-3, which were initially driven to 7-feet below grade (P-3 was later driven to 15-feet below grade) . Probe locations were determined by Mr. Kenneth Earnest of Ultramar, and installation procedures supervised by Mr. Jake Stryd, also of Ultramar. Each probe was then purged 2 to 5 probe volumes of soil gas using a diaphragm pump . Sample flow rates and vacuum were recorded for each sample point . The purged soil gas was then field screened for the presence of total volatile hydrocarbons (TVH) as propane using a Beckman Model 400 Total Hydrocarbon Analyzer equipped with a Flame Ionization Detector (FID) . - 1 -