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0 0 <br /> San Joaquin County <br /> pEnvironmental Health Department DIRECTOR <br /> 0. DIRECTOR <br /> Linda Turkatte,RENS <br /> r.' • 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAMCOORDREHS <br /> Robert McClellon,RENS <br /> • Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> v i F o Ra Website: www.S/gov.org/ehd Rodney Estrada,REHS <br /> Phone: (209)468-3420 Adrienne Ellsaesser,REHS <br /> Fax: (209)464-0138 <br /> November 24, 2014 <br /> Bob Long <br /> Sierra Lumber Manufacturers <br /> PO Box 6216 <br /> Stockton, CA 95207 <br /> Subject: Site Assessment Work Plan Addendum Site Code: 1644 <br /> Sierra Lumber Manufacturers, Inc. (Case No. 2) <br /> 375 West Hazelton Avenue <br /> Stockton, CA 95203 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Site Assessment Work Plan Addendum (Work Plan), dated 15 October 2014, prepared by <br /> Advanced GeoEnviron mental, Inc. (AGE). The work plan was submitted in response to EHD <br /> letter dated July 25, 2014, directing the assessment of the lateral extent of contamination that <br /> resulted from the unauthorized release from a former underground storage tank (UST) system. <br /> In the Work Plan, AGE proposes to: <br /> • Advance a total of two soil borings using a truck-mounted hollow-stem drill rig equipped <br /> with 8.25-inch diameter hollow-stem augers; <br /> • Advance one soil boring approximately 140 feet south of the former UST area, to <br /> approximately 100 feet below surface grade (bsg); <br /> • Advance one soil borings to approximately 125 feet east of the former UST area, to <br /> approximately 100 feet bsg; <br /> • During advancement of both borings, soil samples will be collected at five-foot intervals <br /> beginning at 10 feet bsg, for visual classification (logging lithology) and field screened <br /> using a photo-ionization detector (PID); <br /> • From each boring, grab groundwater samples will be collected at approximately 70 feet <br /> and 100 feet bsg using a water sampling assembly (hydropunch); <br /> • Groundwater samples and, if warranted, soil samples will be analyzed for total <br /> petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), Naphthalene, di-isopropylether (DIPE), tertiary- <br /> amyl methyl ether(TAME), and 1,2-dichloroethane (1,2-DCA); <br /> • Abandon soil borings by backfilling with portland type II cement from total depth to 3 to 6 <br /> inches bsg; <br /> • Decontaminate all sampling tools with an Alconox solution and pressure wash all down- <br /> hole drilling equipment prior to starting each boring; <br />