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' Work Plan for Additional Subsurface Assessment_Former,Unocal Station#2859 _ - March 6,2001 s. Drill cuttings will•be stored at the site pending receipt of�c' emieal analytical data for disposal .The drtlF , cuttings will be stockpiled on.and covered,with plastic sheeting. =Four discrete-soil samples wilt be . • collected from the drill cuttingsfor disposal.characterization.a`s-described.in.AppendixA.' These samples , ' will be submitted to the Jaboratory.for•compositing and.analysis,.and will be-,analyzed:as.described in - Task.5.. Stockpiled soil and,,steam cleaning' -rinsate will.be transported'fo'r disposal-at"an appropriately" licensed facility. :- Task 3.r, Well Development and Sampling' 1 ^ The newly installed groundwater monitoring.wellswill be -developed•after being allowed to'stand a t minimum of 72 hours following completion. During development,-the'.•clarity of the:discharged=well water and selected groundwater parameters.(pH, temperature, and'conductivity) will be.monitored.When ry the discharge water runs clear and the groundwater parameters have stabilized,a grotindwater.sample will_, be collected. Groundwater removed from the well during-developmenf.and sampling=will be transported to an appropriately licensed facility for disposal. The groundwater samples will be:analyzed as described - in Task 5. .The newly installed wells will-be included in they uarterl .monitorin ro ram be" inn in with Y q Y g p, g g g the quarter following installation Task 4. Wellhead Surveying. Following installation,the elevation of the tap ofwell casings for all the_wells'At the-site will be surveyed . .; `. .. to mean sea-level by a California -licensed'surveyor, Horizontal:coordinates of the,-wells'will also be obtained. Task.5. Laboratory Analyses ' = Selected soil and groundwater samples will,be'submitted for ctiemicai'analysis at Sequoia Analyfical, a_. California state-certified Hazardous Material Testing Laboratory(ELAP..#1210,^#'4271,:'and WI624).:Soil k : and groundwater samples-will. be analyzed.for TPHg; benzene, toluene;:.ethylbenzene;and=xylenes (BTEX), and•MtBE by DHS LUFT Method. ,The groundwater samples will also'be analyzed-for tert-. <. . butyl alcohol (TBA), IvItBE; ethyl term-butyl"ether,(ETBE),'di-isopropyl ether'(D1PE),.tert=amyl,methyl ether(TAME)by EPA Method 8260. The drill'cuttings disposal characterization sample will be:analyzed. "a ; for TPHg, BTEX;and MtBE,by DHS.LUFT Method,and for total lead by EPA Method 6010. Task 6. .. .Vapor Extraction Pilot Test' , ? . GR will perform afive-day vapor extractton'+(VE)pilot test-at the site: .The'VE system'wtll be"connected to the`three'existing vapor extraction wells (VE-1-through -VE-3): The"purpose of the VIE' pilot test tis-to,. evaluate-the feasibility of the VE technology.and collect needed site specific data for the design of a VE` system if deemed necessary.:The VE pilot test will also provide GR with data to detennirie`the'area with the highest residual hydrocarbons in the •soil and if there is enough hydrocarbon:mass-to warrant-the installation of a VE system. A'trailer mounted, propane powered internal combustion (IC) engine will-'be used for the VE pilot test. The VE test will be performed in.accordance,with the San Joaquin Valley Air`Pollution Control District(SJVAPCD) source testing guidelines. Laboratory confirmation samples,will be collected { " in Tedlar bags and submitted for analysis to Sequoia Analytical Laboratories (FLAP #12'T4),,,, Vacuum' ` 240079.04 4 '