FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

1-0. 2_1,3 Permits and Utility Clearance To perform the scope of work, two drilling permits were obtained from PHS/EHD. One drilling permit (#09956) was required for the County of San Joaquin parcel and one drilling permit (#013569) was required for the City of Stockton right-of-way. Since drilling was conducted in the City of Stockton sidewalk, an encroachment permit (#64535) was obtained from the City of Stockton Department of Public Works. Copies of all permits are included as Appendix B. On September 22, 1997, Ramage Environmental notified Underground Service Alert (USA) to perform a routine utility clearance inspection (USA Ticket No. 261376). 2.2 Push-Point Soil and Groundwater Grab Sampling and Analysis On Saturday, October 4, 1997, Ramage Environmental collected soil samples from two locations and a groundwater grab sample from one location using a Geoprobee 5400 Direct-Push Technology (Geoprobe) drilling rig. Copies of the Geoprobe Sample Collection and Description Logs are included as Appendix C. The push-point locations were positioned at the known sources of petroleum hydrocarbons (Figure 2). The first push-point boring (SB-6) was located at the southwest corner of the former w UST excavation pit where Kleinfelder identified impacted soil in their soil boring B-5 to a maximum drilling depth of 25.5 feet bgs. While drilling SB-6, the concrete tank pad was encountered on two attempts at a depth of 15 feet bgs before a third step-out location missed the slab and was completed to a depth of 40 feet bgs. The positioning of SB-6 was also constrained to the south by buried utility lines. L The second push-point boring (SB-7)was positioned at the existing OPW street box. The drilling of SB-7 occurred on September 22, 1997. On that date, Mr. Infurna of PHS/EHD questioned the location of the boring relative to the former remote fill. Since the alternate location had not been cleared for utilities, the job was shut-down and re-scheduled. On October 4, 1997, based on a review of PHSIEHD field notes taken during the UST and remote fill removal, an additional push-point boring (SB-8) was positioned approximately 4 feet to the northeast of SB-7. It was agreed that the location of SB-8 was close to the former remote fill where soil sampling during the UST removal identified petroleum hydrocarbons at a depth of 1.5 to 2.0 feet bgs. LW Ramage Environmental had planned to push SB-8 to groundwater for sail and groundwater grab sampling. However, at a depth of 8.5 feet bgs, a buried concrete structure caused rig refusal. Rig refusal was also experienced at the same depth during the drilling of SB-7. 6 LW