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i Several phases of mIemfec morestigations nave been performed at the site some 1993 resulting in the installation of 13 groundwater monitoring wells (MW-I through MW-13), 13 soil vapor extraction (SVE) wells (VW-1 through VM-12 and VX-lb five aireparge (AS) wells (AS-1 through AS-5); freo- product removal; and installation and operation of an suite SVE and AS system. Approximately 32 gallons of fiezpducl was centered to hove peen removed during fee productrecovery, and flee- product has not bete reputed at the Site since 19" (MW-2). 'Ile onsite SVEIAS system opereld fmm August 3, Man, through October 13, 20p5. Show Environmental, roe. edinsami that approximately 333 ponds of gasoline and 3 pounds of benzene were removed during the operation of the onsile SVE, system. Subsequent investigations have annually resulted in definition of the lateral extent of these gasoline imports. The greatest dissolved total petroleum hydrocarbons as gasoWrc (TPRg) groundwater impacts I>1,000 continuum per him (pg/p] arc repotted in the vicinity of the former US'fs (wells MW-1, M7W-3 and C.WX-1). TPHg, beomwe and methyl tear[-butyl ether (MTBE) uu f the mout recand quarterly groundwatern monitoring a conducted an Mamb 28,r2001, me depicted on P tM1 rop ed In cation Vapor Sample Ltion Map Figure 3. PURPOSE AND SCOPE OF SERVICES The purpose of the services outlined in this Workplan is to evaluate the potential for the presence of petroleum hydroatbon-impacted vapor m shallow aubsufce soil beneath the Site Ile collected date will be cited fro mremanon of a human brouh risk assessment. Pre-field Activities • Prepare a espoific health and salty plan (LISP) to address the planned field activities. The BST will address the use ofperonai protective cquipmmt and worker salty during the propoed field activities. • (tomm[ the local public utilities via Underground Service Alen, and mason the services of Cruz Brothers Subsurface Locations to attempt to delineate subsurface public utilities mod conduits in proximity to the preposd oil vapor sampling locations. • Obtain an mincemeat Rom the opium progeny owners to obtain access f the adjacent momrties as necessary f complete that SVS. • Rmein the services of 'I'mneglobal Enviromm rural Gmebemis[ry (TEG), a C52-licensed direcl- push connector(CSI-]06568) to per[ the SVS services. • proper the unities of An Taxies LTD. (Air roxim), a Califomia-certified havedws materials testing laboratory (FLAP No. 2110), to®red in Folsom, C Iffoma, to paintings seal vapor sample analyses. Field Activities The soil awpor survey (SVS) will be perfomcd to assess the presence andlm absence of and vapor po vartelly related W previously identified peoleum hydromrbm-imp ctod soil and groundwater at the Silt. Ifpresen , a risk analysis will be completed to assess if the soil vapor poses unicecploble risk to potentially assured receptors. The SVS will iolude 30 simple Insiders situmed within the Site said to the mar of the Site in the douarmadent direction. Ile projossid SVS sundallg locations are shown on Figure 3. Each SVS sample location will be advanced to approximately 5 let utilizing a direct-push rigor a band heldrolwhanurer. After the boring his been advanced to 5 feet, the tip of the direct pushPods