Laserfiche WebLink
B113L <br /> A tir <br /> 0 an ARCADIS companyE r d e006 <br /> NV/R0Nh1EN 1. <br /> pCRIl4�TjS�RVICES 1'H <br /> Transmitted Via Federal Express <br /> August 24, 2006 <br /> Ms. Lori Duncan <br /> Senior REHS <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202-2708 <br /> Re: Response to Comments—Work Plan Addendum <br /> Former Chevron Service Station 9-8227 <br /> San Joaquin County Environmental Health Department Site Code: 9327 <br /> 242 North Sutter Street <br /> Stockton,California <br /> BBL Project#: 45145 <br /> Dear Ms. Duncan: <br /> Blasland, Bouck & Lee, Inc., an ARCADIS company (BBL), on behalf of Chevron Environmental <br /> Management Company (Chevron) has prepared this letter to address comments to BBL'S Work Plan for <br /> Additional Site Assessment near MW-1, (Work Plan) dated July 26, 2006 provided by the San Joaquin <br /> County Environmental Health Department (County) correspondence dated July 31, 2006. The County's <br /> comments to the Work Plan are shown in bold Italics. A response follows each comment below. <br /> iProvide/ Justification for a shallow soil boring located north/northwest of MW-1. Analytical data <br /> exists from both soil and ground water samples from monitoring well U-7, which belongs to the Unocal <br /> site, and is located in the same direction from MW-1 as the proposed boring. <br /> BBL was not provided analytical results for soil samples collected from monitoring well location U-7, <br /> and was unaware this data exists. BBL requests a copy of the environmental report summarizing the <br /> results of samples collected and analyzed from location U-7 associated with the Unocal #0187 site. <br /> Based on verbal reports by the County that soil samples collected from location U-7 were non-detect for <br /> petroleum hydrocarbons, the soil boring initially proposed in BBL'S Work Plan (identified as SB-2 on <br /> Figure 1 of the Work Plan) is no longer necessary to delineate soil impacts north of MW-1. <br /> The vertical delineation of soil contamination near MW-1. The Work Plan states vertical delineation <br /> was completed with soil samples collected from CPT-1. However, the deepest soil sample collected <br /> from CPT-1 was from 78 feet below surface grade, and was reported to contain 4,800 milligrams per <br /> kilogram (mg/kg) TPH as diesel, 58 mg/kg toluene, 67 mg/kg ethylbenzene and 350 mg/kg xylenes. <br /> 034603054.doc <br /> 10470 Old Placerville Road•Suite 110•Sacramento,CA 95827 <br /> Tel(916)857-0124•Fax(916)857-1965•www.bbl-inc.com.Offices Nationwide <br />