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Quarterly Report - June 1998 <br /> ' CHAPIN BROS., INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> ' 1.0. INTRODUCTION <br /> ' In accordance with the request of Mr Russell Chapin,Advanced GeoEnvirorunental,Inc (AGE)has <br /> prepared this Quarterly Report of field activities conducted at 1766 Monte Diablo Avenue, Stockton, <br /> California The work completed included the installation of additional in-situ air-sparging points on <br /> t29 June 1998 and quarterly ground water monitoring activities, conducted on 30 June 1998 <br /> The continuing soil and ground water remediation is also detailed in this report The location of the r <br /> ' site and its surroundings are illustrated in Figure 1 -Location Map Structures, well locations and <br /> remediation systems are detailed on the site are illustrated in Figure 2 -Site Plan <br /> ' Ground water monitoring activities were perfonned in accordance with guidelines for investigation <br /> of underground storage tank (UST) sites established by the San Joaquin County Public Health <br /> t Services- Environmental Health Division(PHS-EHD) and Cential Valley Regional Water Quality <br /> Control Board (CVRWQCB) <br /> M Site history and findings from previous investigations and monitoring e,%ents at the site are <br /> summarized in Problem Assessment Report (PAR) prepared by Science & Engineering Analysis <br /> Corporation (SEACOR) dated 22 July 1994 and in the Quarterly Report prepared by AGE, dated <br /> ' 03 October 1995 <br /> t2.4. PROCEDURES <br /> 2 1 IN-SITU SPARGE POINT INSTALLATION <br /> ' On 29 July 1997, three in-situ air-sparing (IAS) points {IAS-7 through IAS-9} were installed to <br /> ' depths of 25 and 15 feet bsg using AGE's van-mounted Geoprobe 5400 soil probing machine Two <br /> probe borings were completed as IAS points using one 21-inch long, 3/8-inch I D stainless steel <br /> screen implant attached at 25 feet bsg to an anchor tip One additional probe boring was completed <br /> ' using one 21-inch long, 318-inch I D stainless steel screen implant set at a depth of`15 feet bsg <br /> Vinyl tubing (318-inch O D ) was extended from the sparging screen implant to the surface and a <br /> filter pack (fine glass beads) was installed around the screen implant from a depth of 20 to 25 feet <br /> ' bsg Bentonite sand(#8 bentonite)was used to make a 4-foot plug above the filter pack and the wells u <br /> were grouted to surface grade with portland cement An eight-inch traffic box was installed at the <br /> surface for each IAS point All probe rods used for this purpose were decontaminated in an Alconox <br /> ' solution and rinsed with water between probe borings Soil samples were not collected during <br /> probing activities Sparge point locations are depicted in Figure 2 <br /> Advanced GeoEm ironmental,Inc <br /> 1 <br />