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LIGHT, AIR & SPACE CONSTRUCTION ENVIRONMENTAL SERVICES COMPANY State Contractor's License Number 445403 State EPA R.E.A.Number 04072 PROPOSED WORK PLAN FOR 19589 McKINLEY AVENUE, L' MANTECA, CALIFORNIA Item 1: LA&S will excavate soil from the former UST# 1 location and stockpile the excavation spoils in a proposed bio-remediation treatment pad area(see Excavation and treatment Pad Site plan). The proposed excavation will be approximately fourteen(14) feet wide by twenty-four(24) feet long and will have an approximate depth of twelve (12) feet. A P.I.D. instrument will be onsite and will be used to determine if clean soil has been reached on the side walls and bottom of the excavation. The excavation may be enlarged if field conditions warrant it. Six (6) extremity soil samples will be obtained from the excavation side walls and bottom to confirm successful removal of affected soil. One (1) soil sample will be obtained from �- each side wall and two (2) soils samples will be obtained from the bottom of the excavation. The excavation will generate approximately(150) cubic yards of affected soil. The affected soil will be placed at the proposed bio-remediation work area in a layer LN approximately one (1) foot thick and treated with appropriate bacteria to accelerate the degradation of the petroleum constituents. LN The excavation will be backfilled to grade with native soil taken from other locations on the subject property. The soil will be placed in twelve (12) inch thick lifts and mechanically compacted to a relative 90% compaction density. La Item 2: LA&S will excavate soil from the former UST#2 location and stockpile the excavation spoils in a proposed bio-remediation treatment pad area(see Excavation and treatment Pad Site plan). The proposed excavation will be approximately fourteen (14) feet wide by twenty-four(24) feet long and will have an approximate depth of twelve (12) feet. A P.I.D. instrument will be onsite and will be used to determine if clean soil has been reached on the side walls and bottom of the excavation. The excavation may be enlarged V if field conditions warrant it. Six (6) extremity soil samples will be obtained from the excavation side walls and bottom `" to confirm successful removal of affected soil. One(1) soil sample will be obtained from each side wall and two (2) soils samples will be obtained from the bottom of the Lo excavation. June 15, 2005 Page 3 of 5 MAIN OFFICE • I707 LITTLE ORCHARD STREET,SUITE A•SAN JOSE CA•95125 MAILING ADDRESS•P.O.Box 36303•SAN JOSE w CA•95158-6303• 408/979-0661 OFFICE•408/979-0621 FAX•408/640-2899 CELL PHONE•DGUTHRIDGECLIGHTAIRANDSPACE.COM E-MAIL GENERAL AND ENGINEERING CONTRACTOR•HAZARDOUS SUBSTANCE REMOVAL CONTRACTOR•SITE ENVIRONMENTAL ASSESSMENTS WETLAND AND RIPARIAN HABITAT-ASSESSMENT-DESIGN-RESTORATION-CONSTRUCTION-MITIGATION MONITORING LEO