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OGDEN MARTIN <br /> FST ' CAI.Th <br /> SYSTEMS, INC. <br /> 40 LANE ROAD.CN 2615 pff 2: 14 <br /> FAIRFIELD. NJ 07007-2615 -porn v.o.rC T <br /> z�,m+n. <br /> TEL:12011 882-7285 <br /> FAX:(201)882-4167 <br /> LEON BRASOWSKI <br /> DIRECTOR <br /> ENVIRONMENTAL PERMITTING <br /> April 20, 1994 <br /> Mr. Jon B. Marshack, D. Env. <br /> Environmental/Technical Support Unit <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> SUBJECT: STOCK-TON SOILS TREATMENT FACILITY <br /> GROUNDWATER MONITORING PLAN <br /> Dear Mr. Marshack: <br /> Thank you for your letter of March 29 supporting Ogden's proposal to install a fourth <br /> monitoring well at the site of the Stockton Soils Treatment Facility to further investigate <br /> whether the past soil treatment activities at the site have contributed to groundwater <br /> contamination. <br /> In order to meet the intent of Chapter 15 of the California Water Regulations, we will <br /> immediately move forward with installation of the well and subsequent sampling of all four <br /> wells, giving attention to your comments regarding appropriate sampling, analysis and <br /> reporting. Specifically, the following guidance has been incorporated into the Work Plan <br /> (attached) to ensure that groundwater data collected will confirm closure of the site: <br /> Applicable permit(s) for installation of a fourth well at the site will be <br /> obtained from the San Joaquin County Public Health Services. <br /> The new well will be screened from the bottom of the well to a depth of from <br /> 5 to 10 feet above the groundwater surface to accommodate future <br /> fluctuations in groundwater elevation and to permit installation of a sufficient <br /> sanitary seal to prevent surface water infiltration. <br /> Particle size of the filter media used to pack the annulus will be selected so <br /> as to be able to adequately filter out sediment after sufficient well <br /> development has occurred. Well development will include swabbing and <br /> purging until reasonably free of suspended solids. <br /> H:\DATA\CNAGGE\WP\STOCKTON\MARSHACK <br />