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April 23, 1998 96-1113008.80 State of California Department of the Youth Authority Facilities Planning Division Attention: Ms. Corinda Yep, Chief-Hazardous Materials and Waste Program Subject: LETTER-REPORT -Re-Sampling of Former Diesel Underground Storage Tank Locations Northern California Youth Correctional Center 7650 South Newcastle Road Stockton, California Page 3 DRILLING AND RE-SAMPLING Re-sampling was conducted at the locations of the two former USTs located within the Karl Holton school and at the location of the west UST within the O. H. Close school. Prior to commencing the re- sampling a drilling permit was obtained from SJCEHD. A copy of the completed permit application is included in Attachment A. The borings were each advanced using a truck-mounted, continuous-flight, hollow-stem auger rig. During drilling,soil samples were collected at approximately four-feet below ground surface(bgs) and 10 feet bgs. The bottom sample was collected from approximately 2 feet below the floor of each excavation. Groundwater was not encountered. The drill rig was provided and operated by Woodward Drilling, Inc. out of Rio Vista, California. Prior to drilling, the drilling equipment was steam-cleaned. Between each drilling and sampling event, the drilling/sampling equipment was washed and scrubbed in a non-phosphate detergent, triple- rinsed, and air dried. During drilling, drill cuttings and soil samples were geologically logged visually by the field geologist. The soils encountered were logged using the Unified Soil Classification System(USCS), with geologic/hydrogeologic notations included as appropriate. The field geologist noted that there was no visual and only slight olfactory evidence [CH-4R (4.5')] of TPH-d impacts in the soil samples or drill cuttings. The boring logs are included in Attachment B. Discrete soil samples were collected using an 18-inch long,modified California spilt-spoon sampler or comparable, lined with three 6-inch long brass tubes, driven into the soil using a 140-pound slide hammer. Of the three brass tubes recovered,the middle tube was sealed with Teflon'tape, plastic end caps and placed in a resealable plastic bag. This sample was labeled (using indelible ink with the boring/trench number and sample depth,the project number, sampling daze, and sampler initials), entered on a chain of custody form, stored on ice at 4° Celsius in an insulated chest, and retained for laboratory analysis. A total of seven soil samples, two samples per boring plus one four-part composite for disposal purposes, were submitted to the laboratory for analysis. Upon completion, each boring was sealed with a cement/bentonite grout emplaced using a tremie pipe. Drill cuttings,waste soil samples and decontamination rinsate were stored, pending disposal, in U.S. Department of Transportation(DOT)-approved,55-gallon polyethylene drums per the request of a facility representative. Used disposable PPE was placed in plastic bags and was disposed with the facility trash.