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mental,Adva"nced' <br /> GeoEnviron ' <br /> In.c. <br /> (?f Northern C.'aliforni�l. x <br /> 20 October 1995 <br /> AGE-NG Project No. 95-0103 <br /> Mr. lonsAan Marlowe <br /> MARLOWE PROPERTIES <br /> P. Q. Box 150211 <br /> San Rafael, CA 9491.5-0211 <br /> Subject: Corrective Action Plan <br /> MiARLOWE PROPERTIES <br /> 4648 Waterloo Road, Stockton, California <br /> Dear .Mr. Marlowe, <br /> We are in receipt of letter dated 2 October 1995 prepared by the San Joaquin County Public Health <br /> Services-Environmental Health Division(PHS-IHD) concerning the Corrective Action Plan (CAP) <br /> prepared byAdvarrced GeoEnvironmental, Inc. (AGE) for the referenced site. We are providing the <br /> following comments for your consideration: <br /> a As stated in the PHS-EHD,the CAP included general costs for various remedial alternatives <br /> at the site. Costs included in the CAP were based upon sites of similar size and <br /> concentrations of contarninants. A more detailed cost estimate would constitute a formal <br /> proposal or bid and therefore, not appropriate for inclusion in a report to a regulatory agency. <br /> AGE will be providing you with a detailed cost estimate for remediation of the subject site <br /> within the next 10 days. <br /> The PHS-EHD states that costs of"system monitoring" should be included in the CAP. As <br /> stated in the CAP; costs for monitoring and maintenance of vapor extraction units, including <br /> therma.] oxidizers, will vary widely depending upon the specific manufacturer and accessories <br /> included. However, general system monitoring costs should not exceed $3,000,00 per <br /> quarter, including the drilling of one soil boring. <br /> • The PHS-EHD states that "insufficient feasibility analysis was included to justify the cost <br /> electiveness of vapor extraction vs. excavation." Excavation is generally not a feasible <br /> alternative if soil contamination is present at depths in excess of 25 to 30 feet. At the subject <br /> site, impacted soil is present to depths in excess of 45 feet. Specific site conditions, including <br /> location of structures and the septic system, make excavation an inadVisable remedial option. <br /> Costs for excavation and treatment and/or disposal of impacted soil at the subject site could <br /> range from $150,000 to $200,000, <br /> i`O West %Lr„h I wle-Suitc A. Stockton, [=::thfornia 920 <br /> iele��}u,nc.{ c7v)156 il?C;I <br /> FAX(2c:9)9%-07170 <br />