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31 January 1997 <br /> AGE-NC Project No. 970298 -. <br /> Page 2of6 <br /> area to determine the lateral and vertical extent of hydrocarbon-impacted soil and/or ground water.. <br /> 2.3. GROUND.WATER DEPTH AND FLOW DIRECTION <br /> Ground water was not encountered during removal of the UST Based upon the San Joaquin County <br /> Flood Control Map entitled Lines of Equal Depth in Water Wells-Fall 1993, ground water depth <br /> in the area of the site is approximately 45 to 50 feet below surface grade (bsg). Ground water flow <br /> direction varies locally; however, regional-flow direction inthe.Lodi area is southwest. <br /> 3.0. SCOPE OF WORK <br /> 3.1: PROBE BORING ADVANCEMENT <br /> AGE proposes to initially advance five(5)soil probe borings at the site to determine the lateral and <br /> vertical extent of hydrocarbon-impacted soil and/or ground water. Soil probe borings Will be <br /> advanced using a Geoprobe 5400 probing unit equipped with 1.125-inch_probing rods. Each probe <br /> boring will be advanced to.a depth of 40 feet. <br /> One probe boring will be advanced within the former UST excavation;two probe borings will be <br /> advanced south of the former UST excavation; and two probe.borings will be advanced near the <br /> northern edge of the property, adjacent to Lockeford Street. <br /> Discrete soil samples will be collected at five-foot intervals using a Geoprobe soil sampling <br /> assembly and.four pre-cleaned brass sleeves. Upon sample retrieval,the ends of the second brass <br /> sleeve will,be covered with Teflon sheets,capped and sealed with tape. Each,sample sleeve will be <br /> labeled with the following: boring location, depth,time; date and sampler's initials. Samples will be <br /> analyzed by an on State-certified mobile laboratory. <br /> Grab ground water samples will be collected from all of the soil probe borings using a Geoprobe <br /> water sampling assembly._ Samples will be collected in 40-m1 VOA vials labeled. Samples will be <br /> analyzed by an on site State:certified mobile_laboratory. <br /> 3.2. EQUIPMENT DECONTAMINATION <br /> All sampling tools and brass sleeves used for-sample collection will be thoroughly rinsed with clean <br /> water after washing with a solution of Alconox. All probing rods will be cleaned prior to <br /> advancement at each probing location. <br />