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rSECOR <br /> fnternationad,Inco orate <br /> October 11, 2000 u 17 n,'c f�: 9 <br /> Project 077 42007 010 <br /> Mr Harlin 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 Plein for Groundwater Bitch Exti action ConditionsY1me%,— LOP 5tkt <br /> ARCO Station #434 Date o 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 /> Atlantic Richfield 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 discoveied in well W-9 during <br /> the third quarter 2000 monitoring event Batch extraction will be accomplished by <br /> pumping well VII-9 using a submersible groundwater pump This work plan includes a <br /> 1, brief discussion of site background proposed scope of work, and schedule <br /> SITE DESCRIPTION AND BACKGROUND <br /> The site is located at 501 W Kettlernan 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 ;reale 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 ori <br /> had been poured down the well Analytical results from well W-9 report concentrations <br /> of oil and grease at 430 000 ppb and TPHg at 1 I') ppb Analytical reports and chain-of- <br /> custody documentation are included as Attachment A <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 /> Groundwatei Extractinn Gi oundwater 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 /> 3017 Kilgore Road, Surae 100 Rancho Cordot a. CA 95670 916 866 0400 916 861 04>0 tux umnv secor com <br /> Ze 39vd NOMJ H1JTJ C6bC8906971 ZZ 9T 00OZ16ZloT <br />