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10 <br /> S E C 0 R <br /> Former BP Station# 11193 <br /> September 22, 2004 <br /> . Page 7 <br /> beginning field operations, and was in the possession of SECOR personnel while <br /> conducting work activities at the site <br /> Permitting <br /> Soil boring permits for the completion of CPT borings were approved by SJCEHD prior to <br /> the commencement of field work <br /> CPT Soil Borings <br /> On July 19 and 20, 2004, SECOR field staff supervised Gregg Drilling and Testing during <br /> the completion of CPT soil borings at the site (Figure 1) Sod borings CPT-1 and CPT-2 <br /> were advanced using a 20-ton CPT drilling rig At both locations, initial sod borings were <br /> advanced to 120 feet bgs for lithological description of soil behavior types beneath the site ' <br /> prior to targeting zones for groundwater sample collection No soil samples were collected <br /> in this scope of work Sod boring logs for CPT-1 and CPT-2 are-inCUddeas Attachment 2 �zd <br /> Soil boring details are summarized in Table 1 <br /> Groundwater Sampling and Analysis <br /> Based on the data gathered during the lithological soil borings (Attachment 2), SECOR <br /> selected three target zones per location for groundwater sampling A summary of <br /> groundwater sample depths is included in Table 1 Groundwater samples were collected <br /> from separate soil borings adjacent to CPT-1 at depths of 56, 83, and 115 feet bgs, and <br /> CPT-2 at depths of 59, 89, and 105 feet bgs Groundwater samples were collected by <br /> driving the Hydropunch® sampling equipment to the desired depth and retracting the drive <br /> casing one to three feet to expose the PVC factory slotted screen An appropriate amount <br /> of time was allowed for groundwater to enter the boring and stabilize prior to sampling with <br /> a clean stainless steel bailer Three groundwater samples per boring location were each <br /> collected from separate boreholes to minimize the potential for cross contamination <br /> between zones Groundwater samples were analyzed for the presence of TPHd by EPA <br /> Method 8015, TPHg, BTEX, MtBE, EtBE, TAME, EDB, TBA, DIPE, 1,2-DCA and ethanol <br /> by EPA Method 8260B Certified analytical laboratory reports and chain-of-custody <br /> documentation are included as Attachment 3 SECOR and Gregg Drilling and Testing field <br /> and laboratory procedures are included as Attachment 4 <br /> FINDINGS <br /> MtBE was detected at concentrations of 3 8 pg/L (CPT-1@56') and 1 5 pg/!- (CPT- i <br /> 2@105') All other 8260 analytes including TPHg, BTEX EtBE, TAME, EDB, TBA, DIPE, <br /> 1,2-DCA and ethanol were not detected above the laboratory reporting limit Diesel range <br /> organics (DRO) were detected in all samples at concentrations ranging from 740 Ng/L <br /> (CPT-1 @ 56) to 120 lag/L (CPT-2 @ 105) z <br /> The laboratory report (Attachment 3) indicates that the reported DRO concentrations <br /> -reflect individual or discrete unidentified peaks detected in the diesel range The pattern <br /> does not match a typical fuel standard" The source of DRO detected in HydroPunch <br /> CPT Report 9-04 doc <br /> n <br />