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ENVIRONMENTAL HEALTH 17EPARTMENT <br /> Poi N SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heron,R.E.H.S. P <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> -_ Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> r>. "c • Pro ram Manager Douglas W.Wilson,R.E.H.S. <br /> gcFoRa` g g Margaret Laurie A.Cotulla,R.E.H.S. Telephone: (209) 468-3420 g et Lagorio,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellan,R.E.H.S. <br /> Mark Barcellos,R.E.H.S (b 9 11 <br /> JAMES M & B LANGSTON n <br /> 15820 S HARLAN RD #33 <br /> LATHROP CA 95330 <br /> RE: former Langston's Arco Site Code:1503 <br /> 15615 S. Seventh St. RO#00316 <br /> Lathrop, CA., 95330 CUF#: 00367 <br /> WORK PLAN: "Additional Site Assessment Work Plan" FILE COPY <br /> DATED: September 30, 2005 <br /> PREPARED BY: Advanced Geo-Environmental, Inc. Eyrene Fisher. <br /> STATUS: Approved, with conditions noted below. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25296 10 subd(c)(3)1: <br /> • Install at least two (2), possibly three (3) offsite soil borings to 50-feet deep to <br /> investigate the lateral extent of the petroleum plume and, <br /> • Based on presence of offsite contamination, possibly install one,first ground water <br /> monitoring well to 28 feet below ground surface to continue lateral ground water <br /> plume investigations and, <br /> • Submit a Report of Findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> • In order to avoid any additional delays with completing the investigative phase for <br /> this UST site, EHD directs the following schedule: <br /> o Install at least two soil borings by October 31. 2005. <br /> o Based on soil and ground water analytical data from the two soil borings, <br /> evaluate the need for the addition boring and the monitoring well and if <br /> needed, install them by November 30,2005. <br /> o If no monitoring well is installed,the report of findings is due at EHD by <br /> December 6. 2005 in the format of a Site Conceptual Model (SCM). <br /> o If the monitoring well is installed,the report of findings (SCM)for the soil <br /> borings and the monitoring well soil and ground water data from it, is to be <br /> submitted to EHD no later than January 30. 2006. <br /> • The SCM shall include discussions and evaluations of residual mass(including <br /> lead), migration concerns, additional investigative requirements, if any, and <br /> recommendations for either remedial action or no further action. <br /> REASONS FOR DISAPPROVAL OF THE WORK PLAN [H&S 25296.10 subd(c)(3)1: <br /> • none <br /> DATED: October 3, 2005 BY <br /> Michael Infurna, -e r REHS (209) 468-3454 <br /> [X] Faxed to consultant on: October 3. 2005 i <br />