Laserfiche WebLink
i <br /> l <br /> San Joaquin Goadurty <br /> tla° LJ ' " Environmental Health Department DIRECTOR. <br /> i 2 ' d 2 600 East Matti" Street Donna Hewn, RENS <br /> u`ri 1 PROGRAM COORDINATORS <br /> Stockton , California 95202-3029 Robert McClellon, REHS <br /> ' ----- Jeff Carruesco, RENS, RDI <br /> i o - - c Kasey Foley, REHS <br /> F�R P Website: www sjgov org/ehd Linda Turlcalte, REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> { November 10, 2011 <br /> i � <br /> I <br /> Bill Stoermer Lawrence Beasley <br /> Fremont Plaza Investments Apache Plastics <br /> 7015 Morton Court 2120 Pebble Drive <br /> Stockton, CA 95209 Alamo, CA 94507 <br /> Subject: Former Apache Plastics <br /> 2050 Fremont Street <br /> Stockton ; CA 95209 <br /> i <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed in-Situ <br /> Chemical Oxidation Pitot Test Report (Report), and ISCO Pilot Study Extension Work Plan <br /> (Work Plan) both dated August 31 , 2011, submitted on your behalf by Advanced <br /> GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> l <br />" I AGE proposes in the Report to extend the pilot study by one or more rounds of injection of In <br /> Situ Chemical Oxidation (ISCO) media to determine the efficiency of ISCO to treat the <br /> dissolved hydrocarbon contamination at this site. AGE outlines briefly in the Work Plan a <br /> procedure modified from the original pilot test work plan , proposing to use a different branded <br /> injectant and injecting it under pressure into an onsite groundwater well . The previous <br /> injection was done with a series of direct push borings. AGE identifies well EW-1 as the <br /> treatmentlobservation well; well MW-9 as the transition well , and MW-8 as the compliance i <br /> well. <br /> The EHD approves one additional injection eventwiththe following conditions: <br /> I <br /> 1 . The test design must be improved to include : j <br /> a . An average of 'baseline conditions' , including pH , SC, ORP, DO, total <br /> hardness, COD , BOD ;and TOC must be established over several <br /> measurement events , not just one as was done just prior to the previous <br /> injections. As these parameters vary naturally over time, more than one <br /> measurement is needed to be able to differentiate significant effects of the j <br /> injection from natural variation. <br /> b. Control wells located outside of the injection area must be included in the <br /> monitoring and sampling regimen . j <br /> c. All parameter data collected , both before and after the injection , must be <br /> analyzed and interpreted in context of the injection effects. <br /> 2 . The fate of the increased dissolved contaminant concentrations must be explained . <br /> 3. Approval to perform the injections must be obtained from the Central Valley Regional <br /> Water Quality Control Board . <br /> f <br /> f <br /> t <br /> k <br />