ARCHIVED REPORTS XR0003323 - Laserfiche WebLink

Home Browse Search

Report on Additional Site Assessment and Sod Vapor Extraction Testing 2 7-Eleven Store No 20632,4627 Da Vinci Drive Stockton CA August 14, 2002 30 ADDITIONAL SOiL AND GROUNDWATER ASSESSMENT 31 Permitting/Site-Specific Health and Safety Plan Permits were obtained from the SJCPHS prior to drilling The existing site-specific Health and Safety Plan (as required by the Occupational Safety and Health Administration Standard Hazardous Waste Operations and Emergency Response guidelines 29 Code of Federal Regulations 1910 120)was used during recent activities The document was reviewed and signed by all company personnel and subcontractors prior to commencement of work at the site 32 Soil Boring, Monitoring Wells, and SVEIAS Well Installation On April 8 and 9, 2002, a Shaw E&i geologist under the direction of a California Registered Geologist supervised drilling activities at the site Drilling methods included direct-push Geoprobe methods using Macrocore sampling techniques and rotary drilling using hollow-stem augers The truck-mounted drill ng 6600 is designed to do both types of drilling direct push and rotary Drilling logs are enclosed in Appendix A One vertical delineation soil boring (SB-1)was drilled to a depth of 30 feet bg with a truck-mounted hydraulic Geoprobe drill rig Groundwater samples were then taken using a Hydropunch at depths of 30 and 40 feet bg Groundwater monitoring well MW-4R was advanced to replace MW-4 (which was abandoned during previous site construction) to a depth of 15 feet bg MW-4R was installed with a screen interval from 5 to a 15 feet bg and constructed using 4-inch-diameter Schedule 40 polyvinyl chloride (PVC) casing with flush threads and 0 010-inch-slot well screen Groundwater monitoring wells MW-6 and MW-7 were each advanced to depths of 15 feet bg The monitoring wells were installed with a screen interval from 5 to 15 feet bg and constructed using 2-inch- diameter Schedule 40 PVC casing with flush threads and 0 010-inch-slot well screen Two double nested AS/SVE test wells (SPV-1 and SPV-2) were installed with screen intervals of 10 to 15 a feet bg In the deep segments and 3 to 8 feet bg in the shallow segments Both wells were constructed using 2-inch-diameter Schedule 40 PVC casing with flush threads and 0 010-inch-slot well screen All sod and rinse water generated during the drilling were placed in labeled Department of Transportation (DOT)-approved 55-gallon drums and subsequently removed from the site using proper transportation and disposal protocols n20632sar doc U