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SENT BY: X27-96 ;10:33AM ; CLAYTON PLEASANTON— ;# 3 <br /> i . Clayton <br /> ENVIK—(N <br /> J CONSULTANTS <br /> Mr. Mike Infurna Page 2 <br /> San Joaquin County Public Health Services Clayton Project No. 70127.00 <br /> June 27, 1996 <br /> Task 2: Advance the Soil Boring <br /> Before the advancement of the soil borings commence, Clayton will obtain the <br /> appropriate permits from the San Joaquin County Public Health Services, Environmental <br /> Health Division (EHM <br /> Beforc conducting the investigation, Clayton will mark the location of the planned soil <br /> boring using marking paint. Clayton will contact Underground Service Alert (USA) and <br /> retain a private utility locator to identify the locations of the utilities leading to the site <br /> and onsite near the planned soil boring locations. The identified utilities will be clearly <br /> marked on the ground. Clayton will not advance the soil boring within three feet of a <br /> known utility line. <br /> Clayton will advance one soil boring, B-7, on the subject property in the immediate <br /> vicinity of CRC boring B-6 in the basement (Attachment 1). The sample collected at 5 <br /> feet below ground surface (ft bgs) from this boring had the highest concentrations of <br /> analytes when analyzed. The boring will be advanced using a GeoprobeTM to <br /> approximately 20 ft bgs operated by a drilling subcontractor with a C-57 license. <br /> Drilling and sampling activities will be conducted in accordance with San Joaquin <br /> County and California Regional Water Quality Control Board (RWQCB) guidelines and <br /> with Clayton's drilling, well construction and sampling protocols for <br /> boreholelmonitoring well installation (Attachment 2), under the supervision of a Clayton <br /> geologist registered in the State of California. Soil cores will be collected continuously <br /> for the lengths of the borings in brass, steel, TeflonTm or acetate liners. <br /> Soil samples from 5, 10, 15, and 20 ft bgs, or other depths determined in the field, will <br /> be selected for analysis. Selected soil samples will be sealed using TeflonTM sheets or <br /> aluminum foil and plastic end caps, labeled, and placed into a chilled cooler for <br /> transport to Clayton's State-certified laboratory in Pleasanton, California for analysis. <br /> Chain-of-custody documentation will be followed for the handling of the samples. <br /> During the advancement of the boring, the soil cores will be field inspected. <br /> Distinguishing features such as color, soil texture, and relative soil moisture content will <br /> be noted. The soils will be characterized using unified soil classification system <br /> (USCS) guidelines and Munsell soil color charts. The observed soil characteristics will <br /> be entered onto a boring log in the field. To aid in detecting volatile organics, Clayton <br /> will screen the soil cuttings and spent soil sample cores during drilling using a <br /> photoionization detector (PID) and/or flame ionization detector (FID); the PID and/or <br /> FID readings will be entered onto the boring log. <br /> ILM41t7M 12rr.m 127 W.1 eo <br />