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Soil Vapor Extraction and Air Sparge Feasibility Evaluation Work Plan - University Park September[5,2004 Page 4 All drilling activities will be supervised and observed by a Condor geologist. Drill cuttings.for the SVE well borings will be logged according to the Unified Soil Classification System (USCS). Descriptions of soil types encountered and any other pertinent field observationswill be recorded on boring logs. Cuttings will be placed in a polyethylene bag and checked with a photo-ionization detector (PID) for the presence { of volatile organic compounds. All visual.observations and PID measurements will also be notedon the boring logs. The drill cuttings and steam cleaning effluent will be placed in DOT-approved 55 gallon 1 drums, sealed,labeled, and.left on-site:pending laboratory analyses. 3.3 AS WELL DRILLING PROCEDURES Prior to commencement-of fieldwork, a tailgate safety meeting will be held and a site-specific Health and Safety Plan will be discussed with, and presented to, all field personnel for their signatures. The proposed AS well will be installed.using hollow-stem auger drilling methods. The down-hole equipment will be decontaminated prior to drilling by steam cleaning to prevent cross-contamination.. The well will be completed to a total depth of approximately 55 feet bgs. The well will be constructed with five feet of 4-inch O.D.,-Schedule 40 flush-threaded, machine-slotted PVC screen (slot size 0.020). A flush-threaded PVC bottom cap will be placed at the bottom of the well screen. Blank PVC casing will be installed above the screen to the ground surface. No glue or solvents # will be used in the construction of the well. A filter pack of #3 Monterey sand will be placed in the ' annular space to approximately one foot above the screen. Approximately three feet of bentonite pellets f will be placed above the sand to form a protective seal. A seal of neat cement will be tremied into the t annulus from the bentonite seal to the ground surface and a locking traffic box will be installedat the r ground surface. A typical AS well construction diagram is shown in Figurc.5, Appendix A. } All drilling activities will be observed and supervised by a Condor geologist. Drill cuttings for the AS well boring will be logged according to the USCS. Descriptions of soil types encountered and any other pertinent field observations will be recorded on boring logs. Cuttings will be placed in a polyethylene bag i ' and monitored with a PID for the presence of volatile organic compounds. All visual observations and PID measurements will also be noted on the boring logs. The drill cuttings and steam cleaning effluent will be placed in DOT-approved 55-gallon drums, sealed, labeled, and left on-site pending laboratory analyses. 4.0 SVE PILOT TEST This section describes the proposed SVE pilot test to be conducted at the site. The purpose of the pilot test is to evaluate the effective radius of influence of the SVE wells, to optimize the off-gas abatement process, and to provide data to be used in the design of the SVE treatment system-An electric blower capable of maintaining an airflow of 140 standard cubic feet per minute (scfm) and 80 inches'`;water I - column vacuum shall be used for the pilot test. Extracted soil vapors will be treated by passing them t, through granular activated charcoal canisters. Valves on the blower will make it possible to vary the vacuum applied to the well being tested to aid in determining the optimum vacuum for that well. The pilot test will consist of a short-term test and one long-term test. The short-term test will be a stepped test conducted at a minimum of three different applied vacuums to evaluate the relationship between the applied vacuum and the corresponding airflow. After the optimum vacuum is determined for the SVE well being tested, a long-term pilot test will be conducted for a period of approximately 24 hours at that well. The SVE pilot test will be conducted in accordance with the San Joaquin Valley Air Pollution Control District (SJVA.PCD) requirements. According to the SJVAPCD, no Authority to Construct �.1� CONDOR