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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SANJOAQUIN COUNTY <br /> Unit Supervisors <br /> _Donna K. Heron, R.E.H.S. 304 East Weber' Avenue, Third )"IOOt Carl Borgman, R.E.H.S. <br /> a ip' i Director Mike Huggins, R.E.H.S„ R.D.I. <br /> Al Olsen, RXMIS. Stockton, California 95202-2708 Douglas W. Wilson, R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Margaret Lagorio, R.E.H.S. <br /> e% FOPS' 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 /> PAUL SUPPLE <br /> ATLANTIC RICHFIELD COMPANY OCT 0 4 2004 <br /> PO BOX 6549 <br /> MORAGA CA 95470 <br /> RE: Former ARCO Station #548 Site Code: # 1127 <br /> 1612 Hammer Lane - <br /> Stockton CA 95209 <br /> WORKPLAN: Work Plan for Additional Assessment _ <br /> DATED: August 27, 2004 - <br /> PREPARED BY: URS Corporation <br /> APPROVED: rzl-WITH CONDITIONS, SEE BELOW <br /> DISAPPROVED: [ ] <br /> ADEQUATE AND NECESSARY ELEMENTIS OF THE WORK PLAN [H&S 25296.10(c)(3)1 : <br /> 1 . Installation of one deep, discretely screened monitoring well Eos vertical assessment of the groundwater plume. The <br /> boring for the well will be drilled to approximately 30 feet below the deepest monitoring wen currently on site, or <br /> approximately 95 feet below surface grade (bsg). A monitoring well with 5 feet of screened interval will be <br /> constructed at this depth. <br /> 2. Installation of one shallow monitoring well for lateral assessment of the groundwater plume in the down gradient <br /> direction. <br /> I The work plan states that soil samples will be collected at five foot intervals during drilling of the boreholes, but <br /> does not state how many samples are anticipated to be submitted for analysis. <br /> COMMENTS AND CONDITIONS: <br /> 1 . The boring for the proposed deep monitoring well should be continuously cored, starting at 65 feet bag, to identify an <br /> appropriate, permeable water-bearing interval in which to set the screen. <br /> 2. Soil contamination has not been defined in the former tank pit area (AS-2, 61 .5-foot bsg sample & B-3, 45-foot bsg <br /> sample). SJC/EHD recommends locating the deep monitoring well near soil boring B-3 (between &IW-1 and VW-1). <br /> Soil samples from below 61 .5 feet bsg. must be submitted for analysis. <br /> 3. ARCO is declining at this time to install appropriately screened shallow monitoring wells and proposes instead to <br /> sample the vapor wells onsite as being representative of the shallow groundwater conditions. SJC/EHD will <br /> accept this alternative with the condition that all wells are adequately purged prior to sampling, and that they are <br /> not used for remedis tion. Should site conditions change, appropriately screened monitoring wells must be installed.. <br /> 4. Submit to SJC/EHD a County Well Permit Application, along with the required $89.00 permit fee, and a copy of <br /> any applicable City of Stockton Encroachment Permits or property access agreements for the offsite well. <br /> 5. A report of findings must be submitted to SJC/EHD within 60 days following completion of all fieldwork. <br /> 6. Forty-eight hours notice to SJC/EHD is required prior to all site fieldwork. - <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> - Vernon Elarth, URS <br />