ARCHIVED REPORTS XR0010495 - Laserfiche WebLink

Home Browse Search

duct tape The tube was labeled & placed on ace pending trans- port to FGL laboratory for analysis. The probe of a field cali- brated PID meter was inserted into the plastic bag & readings were recorded. All unused core material and drill cuttings were placed in metal drums. Cores were taken at the following intervals as specified by the approved workplan addendum: 20' -22' 6" . 25' --27' 6" , 30' -32' 6" 35' -37' 6 & 40' --42' 6 Sampling & presery-.ng was done in the same manner described an the above paragraph_ Details of the lithology, core recovery, PID readings, and other relevant data are shown on the attached PLATE C The auger rig was then relocated on the Normac property at Location "B" as shown on PLATE B. The drilling company had sufficient clean auger flights on location so that it was not necessary to decontaminate the ones previously used. Using the same field procedures described above, soil samples were taken at the following intervals: 20 ' -226" , 25' -27' 6" , 30' -32' 6" 35' -37' 6" , and 40' -42' 6" . The attached PLATE D gives details of that work. Unused core material and drill cuttings were placed in metal drums, marked for identification, and stored on site. Upon completion of drilling operations, both borings were grouted to the surface with cement which was thoroughly blended by use of a portable mixer; the slurry was placed in the hole by use of a flexible hose. Cementing operations were witnessed by Mr. Harlen Knoll, REHS, of the San Joaquin County EHD. The preserved soil samples were transported by Wm. Hunter under chain of custody to FGL Environmental laboratory with instruct- ions to test for BTEX & TPH--G DISCUSSION OF RESULTS OF ABOVE WORK: The results of the laboratory analyzes of the above soil samples are tabulated on TABLE VIZI ; copies of the lab worksheets and chain of custody are included as EXHIBITS C & D. LOCATION "A" - This auger hole, located on Hammertown Partners property, was placed as close to soil boring B-5 as possible, (work done an Oct , 1990, ) which had measured minor amounts of benzene, ethylbenaene, & toluene in a soil sample taken at 25' bgl. The purpose was to evaluate changes an levels of contamina- tion which may have occurred in the 3 1/2 years between sampling The first sample taken at 21 ' was below detection limits for BTEX & TPH-G. Benzene was measured at . 008 mg/kg an the sample at 4