WORK PLANS - Laserfiche WebLink

Home Browse Search

Mr.Harlin Knoll April 4,2001 USA Service Station No. 65 Page 3 All geologic work will be conducted under the direct supervision of a State of California Registered Geologist and will be conducted in accordance with standards established by the Tri-Regional Board Guidelines for Hydrocarbon Site Assessment and Remediation (RWQCB 1991). Task 1: Prefield Activities Following approval of the workplan by San Joaquin County Public Health Services, Environmental Health Department (PHS/EHD) the following activities will be implemented: • Update the site-specific Health and Safety Plan, • Secure a permit from PHS/EHD to install one SVE well, • Schedule a C-57 licensed contractor to complete the work,and • Mark the proposed well locations and notify Underground Service Alert, USA Gasoline Corporation, and PHS/EHD of the scheduled field activities. Task 2: Soil Borings and Monitoring Well Installation The proposed location of the SVE well is shown on Figure 2. The initial five feet of the boring will be advanced with a hand auger and/or posthole digger to reduce the possibility of possibility of damaging underground utilities. Soil samples will be collected at 5-foot intervals during the advancement of the borings using a California- type, split-spoon sampler equipped with three pre-cleaned brass tubes. The ends of the bottom-most, intact tube from each sample interval will be lined with Teflon T" sheets, capped, and sealed. Each sample will then be labeled, placed in a resealable plastic bag and stored in an ice-chilled cooler. The samples will remain chilled until relinquished to a state-certified analytical laboratory. Strict chain-of-custody procedures will be followed from the time the samples are collected until the time the samples are relinquished to the laboratory. Soil contained in the remaining brass tubes will be screened for volatile organic compounds using field instrumentation equipped with a photoionization detector (PID). Stratus will record PID readings, soil types, and other pertinent geologic data on the borehole log. Two soil samples (the sample exhibiting the highest PID response and the sample from the bottom of the borehole) will be submitted for chemical analysis. The well will be constructed using 4-inch diameter PVC casing. The well screen will consist of 20 feet of 0.02-inch factory slotted PVC, installed at a depth of approximately 15 to 35 feet bgs. A filter pack of medium aquarium sand will be placed around the well from the bottom of the well screen to a maximum of two feet above the top of the screen. Two feet of bentonite will be placed on top of the filter pack to provide a sanitary seal for C:1Project FileslUSA Gasoline100651Workplans165-workplan.doc 5TRAW6