RES 89333 - Laserfiche WebLink

--,I -City of Pleasanton December 21, 1988 J Quote No. 7097G Page 3-1 SECTION 3.0 SCOPE OF WORK Task 3.1 - Site Insoection and Document Review To conduct a safe and thorough subsurface investigation, it will be necessary to know the location of underground improvements in the vicinity of the proposed boring locations and their surrounding areas. This would involve the review of available records and discussions with local utility personnel. Available public data on the subsurface geology would also be reviewed for relevant data which may be of use in the development of a site hydrogeologic map. Task 3.2 - ExOloratOry Drillina The subsurface investigation will consist of drilling 20 exploratory borings to determine the extent of any unsaturated zone contamination. An EES B-53 drill rig will be used to drill the majority of these borings. Where field conditions prevent the access of a drill rig (stockpiled soil area and sewage digester tanks) hand augering will be used to sample the near surface soils. Groundwater monitoring wells will be constructed in five of the exploration borings. The drilling of the borings will be conducted using a truck-mounted B- 53 drill rig using an 8-inch O.D. hollow stem auger. The auger and other tools used in the hole will be steam cleaned before use and between borings to minimize the possibility of cross-contamination between borings. Relatively undisturbed soil samples will be collected at 5-foot intervals using a modified California split tube sampler with internal brass liners. The boring will be advanced to the desired sampling depth and the modified California sampler will be lowered to the bottom of the hole. The sampler will then be advanced ahead of the auger using a 140-pound hammer. The sampler will then be removed from the hole and broken down into its component parts. The lowermost section of the sampler will be capped, labeled, logged on a chain-of- custody form, and placed in an ice chest for transport to a state-certified