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� V 12 April 1996 AGE-NC Project No. 95-0137 Page 2 of 6 On 14 August 1995, five additional soil borings were drilled at the site under the direction of AGE. Two of the borings were completed as ground water monitoring wells. Petroleum hydrocarbons were detected in soil samples collected during the investigation at concentrations as high as 1,900 parts per million (ppm, reported as milligrams per kilogram); hydrocarbons were detected in ground water samples at concentrations as high as 450,000 parts per billion(ppb, reported as micrograms per liter). 3.0. SCOPE OF WORK 3.1. PROBING AND SAMPLING A subsurface investigation north of the site is necessary to fully delineate the lateral and vortical extent of hydrocarbon-impacted soil and ground water. AGE proposes to advance at least five soil probings both on the Ripon Farm Service property and on the neighborin— Jimco facility. Probings will be advanced to depths of approximately 20 to 25 feet (below ground water), using direct push technology (DPT). Four probings will be advanced on the Jimco property, north of wells M1V-4, NTW-2 and MW-3 and. northeast of boring B 15. One additional probing will be advanced south of MW-1 on the Ripon Farm Service property. All probings will be advanced using AGES Geoprobe 5400 probing unit equipped with 1.125-inch probe rods. Proposed probing locations are illustrated in Figure 2. Soil samples will be collected at five-foot intervals using a Geoprobe sampler and four brass sleeves. Upon sample retrieval, the second brass sleeve will be removed from the sampler. The ends of the sleeve will be immediately covered with Teflon tape or aluminum sheets, capped and sealed with tape. Each sample will be placed in a chilled container for transportation to a State-certified laboratory. Each sample sleeve will be labeled with the following: boring location, depth, time, date and sampler's initials. Grab ground water samples will be collected from selected probings using a Geoprobe water sampling assembly. After collection, samples will be stored in a chilled container, under ice and transported to a State-certified laboratory. 3.2. EQUIPMENT DECONTAMINATION All sampling tools and brass sleeves used for sample collection will be thoroughly rinsed with clean water after washing with a solution of Alconox. All Geoprobe rods are cleaned prior to advancement in each probing location..