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1 <br /> ATTACHMENT A <br />' FIELD METHODOLOGY <br /> A.1 Pennitting and Notification <br /> Prior to initiating any field activities, a well installation permit will be obtained from the <br />' appropriate San Joaquin County agency Based on the final location of the proposed <br /> piezometer, additional permits may be needed prior to mobilization The field geologist <br /> will maintain copy of all permits onsite during all work Underground Service Alert <br />' (USA)will be contacted at least 48 hours prior to unplementing the field program USA <br /> notifies utilities and others who have underground lines in a specified work area As an <br /> additional precaution, a hand auger pilot hole will be advanced to a minimum depth of 5 <br /> feet bgs <br /> A.2 Decontamination of Equipment <br />' All drilling rigs and sampling tools will be decontaminated prior to arrival on site <br /> Augers and sampling equipment will be steam cleaned prior to daily drilling activities <br /> All sampling equipment will be washed between sample intervals using the triple-rinse <br /> cleaning method, which consists of washing the equipment in potable water containing <br /> detergent [i a tnsodium phosphate (TSP)], rinsing in potable water, then rinsing with <br /> distilled water All well development equipment will be steam-cleaned prior to and <br />' following use All water produced during decontamination will be contained for proper <br /> disposal in clean, properly labeled Department of Transportation (DOT) approved 55- <br /> gallon drums <br /> A.3 Soil Sampling <br /> In order to mmunize the possibility of breaching a competent (greater than 3 feet thick) <br />' confining unit, soil samples will be collected for lithologic descriptions at 2-foot intervals <br /> beginning at 55 feet below ground surface (bgs) to total boring depth A clay layer was <br /> encountered in boring U-3 at an approximate depth of 55 feet bgs All borings will be <br />' logged by a geologist working under the supervision of a California Registered <br /> Geologist The boring log form will be used to document drilling activities and <br /> observations The Unified Soil Classification System and ASTM methods for <br /> identification of soils in the field (ASTM D2488) will be used to describe soil type and <br /> engineering properties A standard color chart will be used to describe each sample's <br /> color The on-site geologist will prepare a detailed geologic log of the boring and conduct <br />' field analyses of soil samples <br /> Organic vapor levels(OVLs)will be monitored in soil samples collected during drilling, <br />' using a photo ionization detector (PID) equipped with a 10 6 electron-volt (ev) <br /> photoionizabon lamp or a flame ionization detector (FID) The PID/FID will be <br /> ARCAD]S GERAGHTY&MILLER <br />