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h M f i 4.1 FIELD PREPARATION Prior to beginning each :phase of the field program, ETIC will arrange for access to the Site with the current owner, Mr. Ismael Rivera. The appropriate permits will be obtained from SJCEHD for drilling and well installation and the City of Stockton for,temporary encroachment and sidewalk closure. A health and safety plan will be prepared and implemented during all activities performed at the Site. The :proposed locations for drilling will be marked and checked for the presence of underground utilities by Underground Service Alert. A'private utility-locating contractor will ' also be hired to identify the presence of underground utilities. Each soil boring at the.Site will be cleared for the presence of underground utilities to a minimum depth of 4 feet BGS using a -knife and vacuum system; prior to drilling.' hand auger or an air 4.2DIRECT-PUSH DRILLING,SAMPLING,AND LABORATORY.ANALYSES Drilling will be performed by a C57-licensed contractor using a direct-push drilling rig equipped with a dual-tube sampling system All drilling equipment and sampling tools will be decontaminated prior to beginning the field activities. Reusable sampling equipment will be washed with a Liqui-Nox solution, rinsed with;tap water, and then rinsed with distilled water prior to each use. An ETIC geologist will supervise the drilling and sampling activities. Soil samples will be examined for lithologic identification, and visible signs of contamination, in accordance with the Unified Soil Classification System and the Standard Practice for Description and Identification of Soils (Visual-Manual Procedure), ASTM Designation D2488 (ASTM 2000), and the observations will be recorded on the boring logs. Technical guidance for the activities will be.provided by a California Professional Geologist. } A photoionization detector will be used to .monitor for organic vapors. Measurements of headsp ace vapors from soil samples will be.recorded on the boring logs. If any unusual stains or odors are evident in the soil,additional samples will be collected for laboratory analyses. Soil samples will be collected at 5-6ot intervals; at changes in lithology, where chemical impact is apparent, and at the soil/groundwater interface.-The soil samples will be cut directly from the acetate direct-push liners. The liners will be sealed with Teflon tape and.vinyl.end caps, labeled, stored on ice in a thermally-insulated cooler, and then transported under chain- I of-custody protocol to a state-certified analytical laboratory. r The three:soil borings will be drilled into the first aquifer for the collection of groundwater samples. The total depth of each boring will be approximately 55 feet. A groundwater sample S will be collected from each boring,using new disposable tubing equipped with a check valve or anew disposable bailer. The samples will be<collected in clean 40-mL, hydrochloric-acid- 3 I i. SL-Cent"SCM and Rev.in WP 2007.09 14 _ {