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1 S E C 0 R <br /> r <br /> SIECOR <br />' 3.0 CURRENT ASSESSMENT ACTIVITIES <br /> Between November 9 and 12, 2004, SECOR supervised Test America Drilling Corporation of ; <br /> t Anaheim, California, during the installation of one C monitoring zone groundwater monitoring <br /> well (MW-15) The well was installed using the air-rotary drilling method Additionally, between <br /> April 11 and 15, 2005, SECOR supervised Cascade Drilling Inc (Cascade) of Rancho Cordova, <br /> California, during the installation of two C monitoring zone groundwater monitoring wells (MW- <br /> 16 and MW-17) using the sonic drilling method ` <br /> The completed scope of work is discussed below <br /> R <br /> x <br /> 3.1 Site Health and Safety Plan SKS <br /> ' As required by the Occupational Health and Safety Administration (OSHA) Standard ;n <br /> "Hazardous Waste Operations and Emergency Response" guidelines (29 CFR 1910 120), and <br /> by the California Occupational Health and Safety Administration (Cal-OSHA) "Hazardous Waste <br /> Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), SECOR <br /> updated the current site-specific Health and Safety Plan (HASP) prior to the commencement of y,F <br /> fieldwork The HASP was reviewed by field staff and contractors before beginning field <br /> operations, and was in the possession of SECOR personnel while conducting work activities at nye <br /> ' the site ' <br /> 3.2 Permitting <br /> Prior to installing the groundwater monitoring wells, SECOR obtained well construction permits <br /> from SJCEHD The permits were approved on September 23, 2004 and April 1, 2005 Copies <br /> ' of the permits are included as Appendix C , <br /> 33 Subsurface Utility Clearance °ate <br /> Prior to initiating field activities, SECOR marked the boring locations, contacted Underground <br /> Service Alert (USA) 48 hours prior to the initiation of field work, and contracted a private utility <br /> locator to determine whether the proposed boring locations were clear of potential subsurface <br /> obstructions In addition, all borings were hand augered to 5 feet bgs before mechanical drilling <br /> began <br /> ' 34 Monitoring Well Installation <br /> Boring logs are included in Appendix C, and well construction details are included in Table 1 5 <br /> 341 Air-Rotary Method <br /> Between November 9 and 12, Test America Drilling Corporation installed one monitoring well <br /> (MW-15) using the air-rotary drilling method The well was installed to a depth of 120 feet bgs <br /> and was constructed using 4-inch diameter poly vinyl-chloride (PVC) casing with a 10-foot <br /> 0 020-inch machine slotted screen interval from 110 to 120 feet bgs Field procedures are <br /> included in Appendix D <br /> During the dulling process groundwater was first encountered at approximately 60 feet bgs A <br /> static water level was recorded at approximately 30 feet Due to the nature of the air-rotary � <br /> method this standing water column in the borehole was expelled every time the rotary head was '4 <br /> Updated SCM 2005 doc 6 <br /> 77Cp 64409 05 0005 <br /> i <br />