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Additional Site Assessment Report - December 2000 <br /> Mel Bokides Petroleum - Manteca ?f <br /> 983 Moffat Boulevard, Manteca, California , <br /> 1.0. INTRODUCTION <br /> tAt the request of Mr.Nick Bokides of Mel Bokides'Petroleum(MBP),Advanced GeoEnvironmental, <br /> Inc. (AGE)has prepared this site assessment report for the property located at 983 Moffat Boulevard, <br /> Manteca, California (site). The location of the site is illustrated on Figure 1. A plan of the site is <br /> illustrated on Figure 2. <br /> ' The scope of work included installation of three soil borings and three additional ground water <br /> wells. The purpose of this site assessment was to evaluate the vertical extent of MTBE impact to soil <br /> and ground water at the site, In October 2000,three soil probe borings were advanced at the site and <br /> ' in December 2000, three additional ground water wells were installed at the site. <br /> Background information and results of prior investigations at the site were included in an AGE <br /> prepared document titled Preliminary Investigation and Evaluation Report (PIER) dated 09 March <br /> 1999 and subsequent quarterly,monitoring reports. <br /> 2.0: PROCEDURES <br /> This report is prepared in accordance with guidelines established by the California Regional Water <br /> Quality Control Board-Central Valley Division(RWQCB)for investigation'of underground storage <br /> 1 tank (UST) sites. Soil borings destruction, well construction and sampling were performed in <br /> accordance with the San Joaquin County Public Health_ Services.- Environmental Health Division <br /> (PHS-EHD) guidelines. <br /> ' d water monitoring Soil boring installation and sampling and groan grocedures for the site were p <br /> outlined iii Additional Site'Assessment and Ground Water Extraction Pilot Test Work Plan dated 31 <br /> ' May 2000, prepared by AGE and approved by the PHS-EHD by letter dated 16 June 2000. . ; <br /> ' 2.1. PROBE BORING ADVANCEMENT AND SAMPLING <br /> On 12.October 2000, three soil probe borings (B7 through B9) were advanced at the site under <br /> ' observation by the PHS-EHD. Probe borings'were advanced in the area of the former USTs and in <br /> the areas north,and east of the former diesel UST. Probe boring locations are shown on Figure 2. <br />-' Borings were advanced to a depth of 50 feet below surface grade (bsg):Soil samples were collected <br /> at 5-foot intervals, beginning at a depth of 30 feet bsg. The soil borings were advanced using a <br /> Geoprobe 5400 probing unit equipped with 1.25-inch diameter probe rods with a 2.15-inch diameter <br /> soil sampling assembly. After collection,the ends-of a 6-inch portion of the leading soil-filled sleeve <br /> were covered with Teflon sheets, capped and sealed with tape. After collection, the ends of the <br /> second•leading brass sleeve were covered with aluminum sheets, capped and sealed with tape. The, _ <br />