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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> . c Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 9�i FORS Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> KAREN PETRYNA FILE COPY <br /> SHELL OIL PRODUCTS US Q D <br /> PO BOX 7869 <br /> BURBANK CA 91510-7869 <br /> RE: Shell-branded Station Site Code:506171 <br /> 2494 E. Fremont St. RO#: 0000251 <br /> Stockton, CA., 95205 <br /> WORK PLAN: "Revised Site Investigation Work Plan". <br /> DATED: August 29, 2003 <br /> PREPARED BY: Cambria Environmental Technology, Inc — Joe Neely, RG <br /> STATUS: APPROVED, (with conditions noted in comments) <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN fH&S <br /> 25299.37, subd(c)(3)1: <br /> • Install three onsite monitoring wells, one onsite CPT deep soil boring and <br /> nine offsite CPTs for 1,2-DCA investigation and, <br /> • Conduct aquifer pump test on two existing monitoring wells and conduct <br /> interim groundwater extraction to protect offsite, down-gradient drinking <br /> water well and, <br /> • Collect and analyze groundwater samples from all borings (except SB-19) <br /> for 1,2-DCA and soil samples from selected borings at selected depths for <br /> selected analytes and, <br /> • Submit report of findings to EHD. <br /> COMMENTS AND CONDITIONS: <br /> SHELL continues to sample for lead in the soil and EHD has not directed <br /> nor required this analysis and does not consider it necessary. Three <br /> offsite down gradient borings will have shallow soil sampling for TPHg, <br /> BTEX, and Oxygenates. EHD advises SHELL to reevaluate their proposal <br /> to analyze only for 1,2-DCA, TPHg, and BTEX in the shallow soils when <br /> gathering data to show the lateral and vertical extent of the site <br /> contamination and analyze for ALL petroleum constituents. The recently <br /> submitted Site Conceptual Model (SCM) provided only TPHg and <br /> Benzene groundwater data on the iso-concentration maps and only TPHg, <br /> Benzene and 1,2-DCA soil data on the cross sections. The SCM is to <br /> include soil and groundwater data for these constituents on both iso- <br /> concentration maps and cross sections in the future. The cross sections <br /> should have the soil lithological units drawn across the background with <br /> link-up interpretations for continuity shown. <br />