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ISOIL.VAPOR EXTRACTION PILOT STUDY REPORT San Joaquin County Montgomery Ward Auto Service Center Public Health Services Department 5400 Pacific Avenue,Stockton, CA Site Code 2163 feet above the slotted section The remaining annular space will be backfilled using a cement and bentonite grout For multiple screened sections in the same well, then bentonite chips will be placed from two feet above the lower screen to two feet below the next higher screened interval Sand will be placed on top of the bentonite chips to two feet above this screened interval The above procedure will be repeated for subsequent screened intervals until two feet above the uppermost screened interval is reached The remaining annular space will be ' backfilled using a cement and bentonite grout At the surface, each well will be connected to a header pipe for extraction and/or a header pipe for Injection, as specified in the design The header connections of each well will be supplied with an appropriately sized valve that will allow each well to be isolated for injection or extraction, as required Flush mounted traffic grates will be placed over each well ' SAMPLING EQUIPMENT CLEANING PROTOCOL The augers used to drill the wells will be steam cleaned between each well The drive sampler I will be disassembled and decontaminated prior to each sampling using the following procedure - All excess soil will be scraped off the sampler parts, The sampler will be washed in a solution of Alconox detergent and tap water, and - The sampler will be rinsed with distilled water EFFLUENT HANDLING All effluent generated during the course of the Investigation, e g , soil cuttings and equipment I decontamination fluids, will be sealed in labeled 55-gallon drums The drums will remain on the site, pending the results of the analytical testing at which time the appropriate disposal method will be determined QUALITY ASSURANCE/QUALITY CONTROL In addition to the quality assurance and quality control procedures previously described herem, I one duplicate sample will be obtained and sent to the laboratory for analysis The duplicate will be handled in a manner identical to the samples collected in the field The laboratory will not be informed that this sample is a blank IANALYTICAL TESTING All analytical testing will be completed by a state of California certified hazardous waste +.,..+.«.� laboratory.....,+.,.R. T11 lnl.nrntnr�i �zn1] ip rartifyari fnr all tectt2 to hi- onmrli PtPfj aC nart Of the testi lg' labo a or illi. llavvauway r•aaa vv vva�axavu vi I'--�----- (---- investigation Analyses required for each sample will be noted on the Chain of Custody Record form The Chain of Custody Record form will be handed over to the laboratory after a laboratory representative signs off on the form confirming the number of samples and other information The laboratory will be instructed to use appropriate detection limits on all samples WMK WORD SOPVO Project No 1232 C-2 ENVIRONMENTAL AUDIT, INC