ARCHIVED REPORTS XR0000238 - Laserfiche WebLink

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• i • Project No 58100-06-IIA March 15, 1995 Page 4 will be capped, labeled, chilled, and transported to Advanced Technology Laboratories (ATL), a California-certified environmental laboratory utilizing standard chain-of-custody procedures Submit selected soil samples for the analyses of TPHg and TPHd following EPA Test Method 8015 modified and BTEX following EPA Test Method 8020 Perform headspace surveys on the soil samples collected using a portable organic vapor analyzer (OVA), equipped with a photo ionization detector (PID) or flame ionization detector (FID) Headspace readings represent qualitative indicators of the presence of organic vapors in the pore space of the soil samples collected The headspace readings will be recorded on the boring logs submitted with the final report Onsite soil generated during the boring activities will be collected in 55-gallon drums and stored onsite for disposal following regulatory protocol Provide quality control/quality assurance (QA/QC) procedures during the field activities These procedures will include cleansing/rinsing of the sampling equipment prior to each sampling effort, the cleansing/rinsing of the drill rig augers prior to and between borings and providing chain-of- custody documentation for each sample collected and transferred to the laboratory for analytical testing All drilling, sampling, and related activities will be conducted under the supervision of a Certified Engineering Geologist or a Registered Geologist who shall act as the Task Order Manager and will be responsible for signing the final boring logs Groundwater Monitoring Wells Install groundwater monitoring wells MW-4 through MW-9 at the locations shown on Figure 2 The groundwater monitoring wells will be constructed using 4-inch diameter polyvinyl chloride (PVC) casing The lower portion of the wells will be constructed using 15 feet of 0 020-inch slotted screen PVC casing A filter pack consisting of No 3 monterey sand will be placed around the screen from the bottom of the boring to an elevation of two feet above the screen zone The lower portion of MW-9 will be constructed using approximately 58 feet of 0 10-inch slotted screen PVC casing between depths of approximately 17 to 75 feet bgs A filter pack consisting of pea gravel will be placed around the screen from the bottom of the boring to an elevation of one foot above the screen zone A surge block and intermittent groundwater extraction will be performed to densify the sand pack and to remove sediment prior to placement of a two foot thick seal consisting of hydrated . bentonite chips Above the seal a mixture of bentonite powder and cement will be placed to