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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> ? -.0 Donna Heran,REHS <br /> r.' 1868 East Hazelton Avenue <br /> Q. "� PROGRAM COORDINATORS <br /> U). Stockton, California 95205-6232 Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> • C '' �/ .P Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> 9ciFoaa� Linda Turkatte, REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Ellsaesser,REHS <br /> September 16, 2014 <br /> Mr. Cyrus Youssefi Mr. Joe Mulligan <br /> 601 Main Street Investors PTP Supervising Real Property Agent <br /> 1006 Fourth Street, Suite 701 City of Stockton — Economic Development Dept. <br /> Sacramento, California 95814 425 North EI Dorado Street <br /> Stockton, California 95202 <br /> Subject: Main Street InvestorsNillas de Amistad <br /> 601 East Main Street <br /> Stockton, California 95202 <br /> By letter dated 11 March 2014, the San Joaquin County Environmental Health Department <br /> (EHD) conditionally approved Site Assessment and Vapor Intrusion Investigation Work Plan <br /> ('Work Plan), dated 11 February 2014, prepared and submitted by your consulting firm, <br /> Advanced GeoEnvironmental, Inc. (AGE), on your behalf for the above-referenced site. Since <br /> then, AGE and the EHD have corresponded by telephone and email on 07 May 2014, and <br /> emails on 10 April 2014, 16, 20 and 23 June 2014, and 5 and 8 August 2014 concerning the <br /> Work Plan. <br /> By email dated 16 June 2014, AGE proposed a different procedure to collect soil gas samples <br /> and submitted an addendum to Section 3.1.2 of the Work Plan. Presented below are the <br /> paragraphs, verbatim, in Section 3.1.2 of the Work Plan as revised by AGE: <br /> "A soil-vapor sample will be collected at approximately ten (10) feet bsg in the boring <br /> advanced north of the former UST area at 615 East Main Street. The soil-vapor sample <br /> will be collected utilizing ''Y4inch diameter Teflon tubing and a '%-inch diameter, two-inch <br /> long, disposable polyethylene vapor implant with speed-fit fitting installed to 10 feet bsg. <br /> The soil-vapor sampling boring will be advanced to 10 feet bsg using a truck mounted <br /> AMS Powerprobe 9600 or Geoprobe direct push probing unit equipped with 1.25-inch <br /> probing rods. Once the total depth is reached, the 1.25-inch probing rods will be <br /> removed and the vapor implant, with Teflon tubing attached, will be installed in the <br /> borehole. Once the implant is set a filter pack material consisting of pre-washed #2/12 <br /> Lonestar sand will be added from total depth to approximately 9.5 feet bsg. A dry <br /> bentonite seal will be placed above the filter pack to a depth of 8 to 9.5 feet bsg and pre- <br /> hydrated bentonite will be placed above the dry bentonite from 8 feet bsg to near <br /> surface. The bentonite will be allowed to hydrate for a minimum of one half hour. <br /> Approximately, 3 feet of extra tubing will be run above ground for soil-vapor sample <br /> collection. Additionally, hydrated bentonite will be placed around the tubing at ground <br /> surface to prevent ambient air intrusion. A minimum of 120 minutes equilibrium time will <br /> be allowed at the soil-vapor boring location prior to purging and sample collection." <br />