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Ms.Vicki McCartney,SJCEHD August 29,2008 <br /> Work Plan for Bench-Scale Test and Injection Well Installation Project No.2046-3250-01 <br /> Parkinson's I-5 ARCO Service Station,Stockton,California <br /> Page 7 <br /> Task 2: Injection Well Installation <br /> Task 2A: SoilBoringsr <br /> {�.. <br /> IN <br /> A licensed we I driller will advance the soil borings using a truck-mounted drill rig equipped <br /> with 6-inch diameter hollow stem augers. The approximate location of the proposed borings are <br /> shown on Figure 2. The initial 5 feet of the borings will be advanced with a hand auger and/or <br /> posthole digger to reduce the possibility of damaging underground utilities. Soil samples will be <br /> collected at 5-foot intervals using a California-type, split-spoon sampler equipped with three pre- <br /> cleaned brass sleeves. The ends of the bottom-most, intact sleeve from each sample interval will <br /> be lined with Teflon TM sheets, capped, and sealed. Each sample will then be labeled, placed in a <br /> resealable plastic bag, and stored in an ice-chilled cooler. Chain-of-custody procedures will be <br /> followed from the time the samples are collected until the time the samples are relinquished to <br /> the laboratory. Soil contained in the remaining brass sleeves will be screened for volatile organic <br /> compounds using a photo-ionization detector(PID). Stratus will record PID readings, soil types, <br /> and other pertinent geologic data on a borehole log. A minimum of two soil samples from each —Min. <br /> boring will be submitted for laboratory chemical analyses. Additional samples may be selected <br /> for chemical analyses based on soil type and field observations. In addition, approxim�ly 10 &Awl� <br /> pounds of soil generated (either in brass sleeves or drill-cuttings) during the advancement of the <br /> borings will be collected for use in the proposed bench-scale testing. <br /> Task 2B: Injection Well Installation �! `c <br /> � �t�aov8 � G� <br /> At the termination of soil borings IW-1 and IW-2, 03 injection wells will be constructed within <br /> the annulus of the augers. Each will be constructed using 3/4-inch diameter blank schedule 80 <br /> PVC casing attached to an 18-inch long ceramic 03 sparge point. Each injection point will be <br /> placed at a depth of approximately 21.5 to 23 feet bgs (approximately 8 to 10 feet below average <br /> static water levels). An appropriately sized sand _filter a will be placed around each injection <br /> point. Bentonite (3 feet in thickness) will be placed on top of each filter pack to provide a <br /> sanitary seal for the wells. The remaining annular space around the well casings will be <br /> backfilled to surface grade with neat cement. Traffic-rated vault boxes will be placed over the <br /> wells, and watertight locking caps will be placed on the top of the well casings. Specific <br /> materials and nominal diameters used in actual well construction may vary based on <br /> manufacturer availability and recommendations. <br /> Task 2C: Waste Management <br /> Drill cuttings and wastewater generated during the field activities will be contained in DOT- <br /> approved 55-gallon steel drums. The drums will be appropriately labeled and stored at the site <br /> pending proper disposal. A licensed contractor will transport the soil and wastewater to an <br /> appropriate facility for disposal. <br /> KAParkinsons Hammer 1-5 Arco\Work Plans\Work Plan for Ozone Bench Scale Test.doc <br />