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F11 E 0 ` ? 7 <br /> PUBLIC HtALTH SERVICES ,oAp��N co <br /> SAN JOAQUIN COUNTY .� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �. �P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 9`i 6ii4 <br /> 209/468-3420 <br /> MAR 2 9 2001 <br /> EDWARD RALSTON SCOTT T HOOTON <br /> TOSCO MARKETING COMPANY BP OIL COMPANY <br /> 1380 LEAD HILL RD STE 120 295 41 ST SW <br /> ROSEVILLE CA 95661 RENTON WA 98055 <br /> RE: TOSCO-BP Service Station#11192 SITE CODE: 1995123 <br /> 1403 Country Club Blvd. RO#:0000087 <br /> Stockton, CA.,95204 <br /> San Joaquin County Public Health Services, Environmental Health Division(PHS-EHD)has received a site <br /> map from Getter-Ryan Inc(GRI)titled"Current Site Plan"as well as a report titled"Work Plan for <br /> Subsurface Investigation." The map and work plan were dated March 14,2001 and received by PHS-EHD <br /> on March 15,2001. PHS-EHD has reviewed the map and the work plan and offers the following <br /> comments for your consideration. <br /> The site map appears to answer most of the concerns PHS-EHD has expressed over the years. Thank <br /> you for putting all the effort and detail into this one document. An inspection of the well boxes will be <br /> conducted during the next phase of field work. Please ensure that all subsurface tubes and casings have <br /> watertight caps on them before the inspection. <br /> The work plan proposes to delineate the lateral extent of contamination by advancing six offsite and two <br /> onsite Geoprobe soil borings. Additionally,this plan proposes to investigate the vertical extent of petroleum <br /> contamination onsite with one cone penetrometer test(CPT)boring. The soil and groundwater laboratory <br /> analyses included in the proposal are approved with the exception of EPA Method 8020 for methyl tertiary <br /> butyl ether(MtBE). Method 8020 is unacceptable for anaWng MtBE. Please use EPA Method 8260B for <br /> this constituent as well as the other oxygenates listed in your work plan. <br /> A sensitive receptor search was proposed in this work plan. The search should be expanded to a radius of <br /> 2,000 feet and not the 1,000 feet proposed in the work plan. The work plan states that,"Questionnaires <br /> seeking information on potential receptors will be mailed to all businesses and residences mthin 500 feet <br /> (of)the site': Questionnaires are not required by PHS-EHD but if any receptor within this 2,000 foot radius <br /> is identified that may be threatened by contamination present at this site,you may want to ensure that the <br /> owner of that receptor is made aware of the potential threat. Moreover, if petroleum constituents are <br /> detected in groundwater samples collected from the proposed monitoring wells,the private wells dose to <br /> these monitoring wells should be sampled for petroleum constituents also. Please take the necessary <br /> steps with the owners of the receptors immediately to ensure that access to these private wells is granted <br /> so that the well may be sampled as quickly as possible. <br /> A Division of San Joaquin County Health Care Services <br />