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N. <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> c ��� •?� Donna K.Heran,R.E.H.S. Unit Supervisorsman,R.E.H.S.Carl Bor <br /> Director 304 East Weber Avenue, Third Floor Borg <br /> man, <br /> Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> egC/Foaa�P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mare ER.Copy <br /> KAREN PETRYNA JAN O 8 2003 <br /> SHELL OIL PRODUCTS USA <br /> PO BOX 7869 <br /> BURBANK CA 91510-7869 (A� <br /> RE: Former Shell Service Station Site Code-505602 <br /> 1267 Country Club Blvd. RO#: 0000062 <br /> Stockton, CA., 95204 <br /> WORKPLAN: Response Letter/Site Conceptual Model/Site <br /> Investigation Work Plan <br /> DATED: November 19, 2002 <br /> PREPARED BY: Cambria Environmental — Joe Neely, RG. <br /> STATUS: APPROVED with conditions noted below. <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN (Health & <br /> Safety Code (H&S) Section 25299.37(c) <br /> • Install five CPT borings to 100' bgs to further investigate the vertical <br /> extent of petroleum hydrocarbons in groundwater and, <br /> • Collect and analyze unsaturated soil samples for TPH as diesel and <br /> collect groundwater samples in `laterally continuous coarse-grained <br /> (sandy) zones' (LCCGZ) or in the absence of LCCGZ, at ten-foot <br /> intervals and, <br /> • Analyze groundwater samples for TPHd and TPHg (8015m), BTEX <br /> (8020), 1,2-DCA (82606), and <br /> • Submit report of findings in the context of a site conceptual model <br /> (SCM). <br /> COMMENTS AND CONDITIONS: <br /> • As coarse-grained (sand) bodies may be linear or curvilinear rather <br /> than tabular, and still function as significant contaminant migration <br /> pathways, groundwater samples are to be collected from significant <br /> sand zones identified by the CPT logs and should NOT be limited to <br /> LCCGZ or ten-foot intervals ONLY, and <br />