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SE��R <br /> f+';E International Incorporated <br /> October '1 1, 2000 110 OCT <br /> Project 077.42007.030 + 19 <br /> Mr. Marlin Knoll <br /> San Joaquin County Public Health Services , <br /> Environmental Health Division ENVIRONMENTAL HEALTH DIVISION <br /> 304 East Weber Avenue, Third Floor 304 E. Weber Ave. Third Floor <br /> P. O. Box 388, o kton CA 95201-0388 <br /> Stockton, California Approved <br /> Denied <br /> Re: Work Plan for Groundwater Batch Extraction ConditionsYlm,�,- &0(7 dt <br /> ARCO Station #434iy�4fe v , vo by <br /> 501 W. Kettleman Lane <br /> Lodi, California <br /> Dear Mr- Knoll: <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of <br /> AtlanticRichfield Company (ARCO), presents a work plan for batch extraction of <br /> groundwater from well W-9 at the site referenced above. The objective of batch <br /> extraction at this site is to remove oil and grease recently discovered in well W-9 during <br /> the third quarter 2000 monitoring event. Batch extraction will be accomplished by. <br /> pumping well W-9 using a submersible groundwater pump. This work plan includes a <br /> brief discussion of site background, proposed scope of work, and schedule. <br /> SITE DESCRIPTION AND .BACKGROUND <br /> The site is located at 501 W. Kettleman Lane in Lodi, California. The site is an active <br /> AMIPM mini-mart and ARCO service station. Three gasoline underground storage <br /> tanks (USTs) and associated product lines and dispensers are present at the site. <br /> Currently, six site wells are monitored and sampled quarterly. During the third quarter <br /> 2000 sampling event, oil and grease were found to be present in well W-9- Prior to the <br /> third quarter 2000, well W-9 has had no reported concentrations of petroleum <br /> hydrocarbons. A SECOR sampling technician noted that it appeared as though used oil <br /> had beenoured down the well. Analytical results from well W-9 report concentrations <br /> p Y P <br /> of oil and grease at 430,000 ppb and TPHg at 113 ppb. Analytical reports and chain-of- <br /> custody documentation are included as Attachment A. <br /> I <br /> PROPOSED SCOPE OF WORK <br /> The scope of work for the proposed batch extraction of groundwater will include the <br /> pumping of groundwater from well W-9 as discussed below. <br /> • Groundwater Extraction. Groundwater extraction will include the pumping of <br /> groundwater from well W-9. Groundwater will be pumped from the above- <br /> mentioned well using a submersible groundwater extraction pump. Water will be <br /> 3017Kilgore Road Suite 100,Rancho Cordova, CA 95670 916.861.0400 916.861.0430 Fax www.secor.coin <br /> I <br />