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i <br /> 1 <br /> 1 <br /> Quarterly Report - June and July 1999 <br /> ' CHAPIN BROTHERS, INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> 10 INTRODUCTION <br /> At the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Quarterly Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, California <br /> The site setting is illustrated in Figure 1 Structures and well locations on or near the site are <br /> illustrated in Figure 2 <br /> Soil and ground water remediation activities were evaluated during this quarter Soil and ground <br /> water samples were collected in May and July to determine the effectiveness of the corrective action <br /> and to aid in determination of the remaining hydrocarbon mass impacting soil and ground water <br /> Additionally, quarterly ground water monitoring activities were conducted on 30 June 1999 <br /> 1 <br /> Site history and findings from previous investigations and monitoring events at the site are <br /> summarized in Problem Assessment Repos t (PAR) prepared by Science & Engineering Analysis <br /> Corporation (SEACOR) dated 22 July 1994 and in the Quay tei ly Report-September 1995 prepared <br /> by AGE, dated 03 October 1995 <br /> Ir <br /> 20 PROCEDURES <br /> Ground water monitoring and soil sampling activities were performed in accordance with guidelines <br /> established by the San Joaquin County Public Health Services - Environmental Health Division <br /> (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) and were <br /> performed in accordance with the approved Nkork Plan Addendums, dated 07 April 1997, 10 May <br /> 1999 and 05 July 1999 <br /> 1 <br /> ' 2 1 PROBE BORINGS AND SAMPLING <br /> On 24 and 25 May 1999 and 20 July 1999 five soil probe borings (CBl through C135) and ten <br /> ' hydro-punch` borings (CHP1 through CHP9, and CHP5C) were advanced at the site, under <br /> observation by the PHS-EHD Probe borings for soil confirmation were advanced in the area of the <br /> former USTs and on a vacant lot 200 feet southwest of the former UST area <br /> ' Confirmation soil boring were advanced near previous borings to compare analytical results with <br /> previously obtained from soil boring samples Probe boring CB I was advanced to a depth of 40 feet <br /> below surface grade (bsg) near MW-1, soil probe boring C132 ( near VW-7 and MW-4) was <br /> . advanced to a depth of 35 feet bsg, boring CB3 (near MW-5 and B7) was advanced to a depth of 30 <br /> feet bsg, confirmation soil boring CB4 (near MW--)was advanced to a depth of 20 feet bsg and <br /> confirmation soil boring CB5 (near VE-1) xNas advanced to a depth of 35 feet bsg <br /> 4diajrced GcoEn%pronmeninI,Inc <br />