Laserfiche WebLink
RAMAGE <br /> ENVIRONMENTAL Sacrainento Office <br /> t_4'F ntova Way, Suite 200 <br /> Rancho Murieta, CA 95683 <br /> ,Te1-(9 J 6).354:3250<_ <br /> June 5, 1998 EN11tRONME-11 Al. <br /> 304 B. Weber s�'fv.'rhird Boor <br /> P.O. Box 388, Stock:on, CA 85201-0388 <br /> Phone: (209)488-3420 <br /> Mr.Harlan Knoll, Sr.R.E.H.S. fpFA ySe] ME AND REGULAR MAIL <br /> San Joaquin County PHS/EHD <br /> 304 East Weber Avenue,P Floor Approved with changeS: See Remarks <br /> Stockton,CA 95201-0388 Disapprov : See.Remarks <br /> Remark <br /> Re: Addendum to PARICAP Submittal <br /> San Joaquin Catholic Cemetery, Stockton, Calif <br /> USTCF Claim 91092 YA <br /> Date 677 f(^ <br /> Dear Mr. Knoll: <br /> Approval of these plans extends only to th,A <br /> It was a pleasure to speak with you this week regarding 'iCVir�ta 'S1� `err.�,,, <br /> P P Y g g Yfln or appro:l <br /> Assessment Report and Corrective Action Plan(PA'. aBVia UlieiT�8rlt8 Oi �tc►iG i lr ; <br /> The CAP portion of the PAR/CAP outlined proposed methods�or�iheri�mplementation of soil vapor <br /> extraction (SVE)via existing wells VW-1,VW-2, VW-3 and VW-4. The technical basis for the SVE <br /> design criteria was data obtained from a previously performed vapor extraction pilot test. In addition,the <br /> CAP portion of the PAR/CAP also proposed the design, permitting and implementation tasks necessary <br /> to initiate SVE and remove source gasoline hydrocarbons from beneath the subject site investigation <br /> area. <br /> In response to your comments,this addendum document addresses the following concerns: <br /> • A comparison of other remedial technologies on a performance and cost basis" <br /> • The integration of air sparging into the proposed CAP. <br /> REMEDIAL TECHNOLOGY COMPARISON <br /> This portion of the addendum briefly describes other remedial technologies that were evaluated prior to <br /> selecting SVE as a hydrocarbon source removal technique for the subject site. <br /> Direct Excavation <br /> The removal of soil impacted with gasoline hydrocarbons would require extensive excavation adjacent to <br /> the mausoleum building to a minimum depth of approximately 40 feet below ground surface(bgs). While a <br /> detailed cost estimate was not developed for this option,a remedial excavation program would require 1) <br /> the installation of a shoring system,2)excavation of approximately 5,000 cubic yards(cy)of soil beyond <br /> and beneath the mausoleum structure,3)on-site treatment of excavated soil(or offsite disposal)and 4) <br /> backfill and compaction of the excavation. Ramage Environmental estimates that such a program would <br /> cost approximately$100-$120/cy or about$500,00-$600,000. For obvious economic reasons,this option <br /> was not given further consideration. <br />