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f RECEIVED <br /> \ FEB 0 7 2012 <br /> 11117APEX <br /> EWRONMENTAL <br /> HEALTH <br /> 11244 Pyrites Way • Gold River,, CFEWI�.SERACES <br /> E N Y I R O T E C H , I N C . Phone 916.651 .0174 • Fax 916.851.0177 • Toll Free 1 .800.242.5249 <br /> February 6, 2012 <br /> 1 Mr. Michael hifurna <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California, 95202 <br /> i Subject: Dual Phase Extraction Pilot Test Work Plan <br /> Former Beneto Facility <br /> 749 East Charter Way, Stockton, California <br /> Apex Project No . BEN58 .005 <br /> i1 Dear Mr. Infurna: <br /> — Apex Envirotech, Inc. (Apex) has been authorized by Beneto, Ina (Beneto) to provide this <br /> workplan proposing a 4-day (96 hour) dual phase extraction (DPE) pilot test at the subject <br /> jproperty (Figures 1 and 2) . The work proposed was requested by the San Joaquin County <br /> Environmental Health Department in a phone conversation on January 9 2011 . All work <br /> described in this proposal will be conducted according to Apex standard oper ting procedures <br /> (SOP) included as Appendix A. <br /> :i 01 ' <br /> This report is based, in part, on information obtained by Apex from Beneto, and is subject to <br /> modification as newly acquired information may warrant. <br /> -� SITE DESCRIPTION <br /> The site is located at 749 East Charter Way in Stockton, San Joaquin County, California <br /> (Figure 1 ). The site is an operating gas station with underground storage tanks (USTs) <br /> containing multiple grades of unleaded gasoline. <br /> BACKGROUND <br /> January 1990 — California Geophysical Group (CGG) supervised the installation of groundwater <br /> monitoring wells MW- 1 , MW-2, and MW-3 . Field activities were detailed in CGG' s Site <br /> Assessment Report, dated February 9, 1990 . <br /> March and April 1992 — CGG supervised the installation of groundwater monitoring wells <br /> MW-4, MW-5 , and MW-6 . Field activities were detailed in CGG' s Site Assessment Report, <br /> `I dated April 30, 1992 . <br />