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ENVIRONMENTAL HEALTH DEPARTMENT <br /> I <br /> SAN JOAQUIN COUNTY <br /> �.G Unit Supervisors <br /> Q: L�• ;`: ;2� Donna K.Reran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Mike Huggins,R.E.H.S.,R.D.T. <br /> • Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R. .lLs. <br /> • c4`� . .RSP Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S.' <br /> o Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H. <br /> Mark Barcellos,R.E.H.S.. <br /> SCOTT HOOTON <br /> BP OIL COMPANY <br /> a <br /> 295 SW 41TH STREET 1 <br /> BLDG.13,SUITE N <br /> RENTON WA 98055 <br /> RE: 1469 Hammer Lane,Stockton(Former BP Oil Site#11191) LOP Site Code: 1126 <br /> WORK PLAN: Investigation Work Plan/Addendum <br /> DATED: October 9,2002 <br /> PREPARED BY: URS <br /> APPROVED: x] <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN tH&S 25299.37,subd(c)(3)]: <br /> 1. To install three groundwater monitoring wells;one on site to define the vertical extent of soil and groundwater <br /> contamination and 2 off site wells to evaluate the lateral extent of groundwater contamination at first water. <br /> 2. To collect soil and groundwater samples for analyses:TPHg,BTEX;IfIBE,and TBA. <br /> 3. To report finding to EHD for review and comment by I4arch 1,2003. <br /> COI-LIIENTS AND NDITI NS: <br /> 1. The extent of groundwater contamination to the north and east will also need to be defined. No wells have <br /> been proposed in those directions. <br /> 2. The WP proposes 30 foot TNAV screen intervals. Soil samples must be taken to determine if any barrier to <br /> vertical migration exist. If barriers exist,well screens must not cross them. <br /> 3. A Site Conceptual Model should be included in the monitoring well installation report. The report deadline is <br /> March 1,2003. � <br /> 4. The"Tri-Regional Board Staff Recommendations For Preliminary Evaluation and Investigation of , <br /> Underground Tank Sites"along with its"Appendix A"and"Appendix B"should be used as guidance <br /> documents. All work and reports which require geological or engineering evaluation must be performed under <br /> the direction of an appropriate California registered or certified professional. <br /> DATED nit410/1)2 BY <br /> Harlin Knoll.Senior REES(209)468-3412 <br /> CC; URS r--- <br /> Tosco—David Camille <br />