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i 11!!b%TC A S S O C I A T E S I N C The investigation included drilling seventeen soil bonngs, installing five groundwater monitoring wells, five vapor extraction wells, one piezometer, and one recovery well, collecting and analyzing soil and groundwater samples, monitoring fluid levels in the wells, performing a groundwater aquifer test, and performing a soil vapor extraction test (VET) A complete summary of previous environmental work performed on site is contained in RESNA Industries' Inc Final Remediation Plan for Sail and Groundwater Remediation, dated November 17, 1994 PROPOSED SCOPE OF WORK Petroleum impacted soil and groundwater can often be remediated using vapor extraction and air sparge techniques Vapor extraction and air sparging of petroleum hydrocarbon impacted soil utilizes the fact that some petroleum hydrocarbon constituents can be volatilized or changed from the solid or liquid phase to the vapor phase at normal temperatures The movement of air through the soil and groundwater, which is accomplished by injecting air into the groundwater and soil through air sparge wells, facilitates the volatilization of contaminants to the vapor phase These contaminants are then removed from the soil and groundwater by extracting the vapor with the petroleum hydrocarbons from the subsurface through vapor extraction wells and subsequently treating the vapor ATC will perform a VET and air sparge test to collect site specific data relative to vapor extraction and air sparging from the subsurface and to evaluate the feasibility of vapor extraction and air sparging as remedial alternatives The results of the pilot test will help to determine the effective radius of influence, to select the optimum old gas abatement process, and to develop engineering design criteria for the construction of a soil remediation system at the subject site The equipment that will be used during the VET and air sparge test consist of an internal combustion (IC) engine, a 5 horsepower blower, helium gas, a helium gas detector, a compressor, instrumentation for measuring air flow, air velocity, air pressure and air temperature, polyvinyl chloride (PVC) piping, fittings, wellhead connections, a portable organic vapor analyzer, and air and groundwater sampling apparatus Job Preparation and Coordination ATC will notify the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) and PHS/EM at least 48 hours prior to performing the pilot test A completed Site Safety Plan (SSP) is contained in Attachment 1 and a Quality Control/Quality Assurance Plan is contained in Attachment 2 All field work will be completed in accordance with these plans Proposed Field Methods OneFlongrm to and ane short-term vapor extraction pilot tes will be conducted on vapor wells ! VW-1 and VW-5s, respectively The short term vapor a raction test will be performed in conjunction w 162574162574 011943671veswkp doe 2