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I SECOR <br /> 111h,;nallonal h1col/x0lale(/ <br /> December 18, 2000 <br /> Mr Marty Hartzell <br /> California RWQCB Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> Subject: Addendum To The Problem Assessment Report <br /> Ranch Market <br /> 23569 Santa Fe Road <br /> Riverbank, California <br /> SECOR Project No. 077.42098.004 <br /> Dear Mr Hartzell <br /> Per your request, SECOR International Incorporated (SECOR) submits an addendum to <br /> SECOR's Problem Assessment Report (PAR) dated November 8, 2000 for the Ranch Market <br /> Site (Attachment 1, Figures 1 and 2) This letter includes a remediation feasibility matrix <br /> presenting cost estimates for five soil and groundwater remedial options for the subject site <br /> (Attachment 2, Table 1) <br /> The following technologies and associated cost to remediate petroleum hydrocarbons adsorbed <br /> to soil and dissolved in groundwater at the Site were evaluated <br /> • Soil Excavation, <br /> • Passive Biodegradation with long term groundwater monitoring, <br /> • In-situ Biologic and/or Chemical Treatment, <br /> • Soil Vapor Extraction combined with Air Sparging (SVE/AS), <br /> • Soil Vapor Extraction combined with Ozone Sparging (SVE/OS) <br /> • Soil SVE/AS combined with Groundwater Extraction and Treatment (GET), <br /> Due to the depth to water and high formation permeability, cost estimates for Dual Phase <br /> Extraction and Water Treatment (DPET) were not prepared <br /> Based upon the distribution of gasoline in the soil and groundwater, the lithology, and depth to <br /> groundwater, SECOR eliminated most of the considered alternatives <br /> Option 1 Soil Excavation <br /> Removal of the impacted soil by excavation was eliminated due to the impracticality of <br /> excavating to depths in excess of the 30 feet In addition, soil excavation will not remove or <br /> degrade the gasoline dissolved in groundwater Costs estimates to excavate an area 30 feet by 40 <br /> File Ranch Markets PAR Cost Est 1 doc <br /> 301- hrl"u)it, harm SlyIh 100 Rancho (r,rcloru ( 1 956-0 ()1�, tial uaUU 'll(r 5G1 0fy) I(I% llrrrr tcor trOP <br />