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w=. - r 30 September 2005. AGE-NC Project-No. 97 0343 -- _ Page 2 of 6 2.1. PERMITTING AND'PRE-FIELD.WORK ACTIVITIES `Applicable site permits4i'06 obtained from the San•Jo_aquin County(i a 'building,electrical,etc.) and from the San Joaquin-County Air.Pollution Control District(SJCAPCD).In addition,an update to the, health and safety plan.presently-oil-file will_be,prepared'-in accordance with'.rOccupational ., Safety ond.Health F.--Guidane_e,lLlanual'foi=-Ha'zardous Wasti Site Activities (Nationid--Institute; for _ Occupational Safety and Health-'Adm nistration, U.S. Coast. Guard_ and'`U.S.�_Environrr ental ,r Protection Agency, 1985).'-Prior to mobilization,-all underground trenching areas will be clearly _= marked and a utility clearance:obtain ed-through Underground-Service _Alert. .- f' = -2.2. Y:: INSTALLATION ORR.EMEDIATION WELLS Currently, SVE wells VW 1,VW-2 and VW 3 ale screened through the yadose zone and located in the core-area of the-soil petroleum-impacted area at.the site. Based on thie results of the.SVE pilot test conducted at the site in January 2002,a tlieoretical•radiusof'influence of 47 feet was estimated t for SVE;,the estimated SVE_radius of mtluence.at wells V W 1-,VVit-2 and VW-3 and the.Core-area . of petroleum-impacted soil are depicted"in'Figure 2.';Utilization of wells VW-1, VW 2-and VW-3 _ and the'dual competed counterparts of these well s;.mOhl toring wells MW-1;MW-2:.and MW=3 (as :these wells are currently dry) for-an interim remediation SVE system should,be adequate to cover 'r , _. . - _`. Y : . the core-area of.petroleum-imp -acted soil _2:3: INSTALLATION OF=-INTERIM REMEDIATION SYSTEM PIPING NETWORK '. - + A remediation system.pipingrietwork willbe installed underground in a 4 8-inch wide by a18 inch - y --: ."..deep trench; the proposed'tre_nching location,is-depicted in Figure 2;a cross sectional view of the trench is: depicted -in Figure.3 In the trench, two-inch diameter,.schedule`.80 PVC piping:will be connected to amanifold-from the well-heads at VW-1,VW:-2 VW-3;MW-1,MW'-2'and MW-7-3 and routed to the proposed=vapor extraction-uriit.=Followingpiping placement,:the trench Will'be backfilled with imported road-,base sand,compacted and resurfaced withasphalt:. - - .-_ - _ 4 _ _Installation of a-15-foot wide=by 15-foot 1',ong enclosure utilizing temporary chain-link fencing with ` . a'gate will be located.northwest of the building on site to secure the_vapor,extraction_unii and the round water treatments sterni.:The proposed remediation system fencing enclosure is-illustrated in Figure 4.- r °fig;. Y � i -- -` dvatrced GeAnvironmental,Inca - - ; � t