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Advanced ENVixatfME . HEALlll ' l <br /> r.,,h' SERVICE, <br /> P T , .� . <br /> GeoEnviro'nmental,o�I ,PH 12: 2 0- <br /> SMI JOJWUIN COUNTYOlvotoNmEmTf <br /> 18 July 2003 <br /> 304 E WEBER A11E THIRD FUM <br /> AGE-NC Project No. 95-0142 BTOCKTON gm <br /> /Mr.Harlin Knoll !3' <br /> San Joaquin County-Environmental Health DepartQnAPPf NVftM8I asIIMIMIMi . <br /> 304 East Webber Avenue, Third Floor ❑ me"Mat asftme V <br /> Stockton, California 95202 , Renw ft <br /> Subject: Final Remediation Plan Addendum <br /> STOCKTON PLATING Date 2L2:31 0,1 <br /> oMpbdatwMahYNloas►and dsuodbed. <br /> e Stock <br /> . 632 South El Dorado Stret, <br /> �dn nst autharra ar aMtwir.self an�sn• <br /> deviation from renOrements of state laws or local ordinances. <br /> Dear Mr. Knoll: . <br /> At the request of.Mr. Richard Leland, Advanced GeoEnvironmental, Inc. (AGE) has prepared a <br /> Final Remediation Plan Addendurrirfor the site located at 632 South El Dorado Street, Stockton, <br /> California. The location of the site is depicted in Figure 1 and a detailed site map is included in <br /> Figure 2. <br /> I <br /> Based upon AGE's meeting with state and county regulators on 08 July 2003,the following changes <br /> to the scope of work stated in the AGE-prepared Final Remediation Plan (FRP) are proposed: <br /> ' Initially,no additional remediation wells will be installed at the site.The two existing ground <br /> water extraction wells and the four'drowned vapor wells will be utilized for:combined <br /> ground water and soil vapor'extraction. <br /> • The drowned vapor.wells will be converted to dual-phase extraction wells.In order to lower <br /> t the water table level in the drowned vapor wells,two-inch;continual operation,pneumatic- <br /> actuated pumps will be installed at the bottom of the vapor wells; the groundwater pumps <br /> will be.operaied in direct conjunction with active soil vapor extraction from each of the <br /> vapor wells (Figure 3). <br /> • As proposed in the FRP; four-inch diameter electrical pumps will be installed in ground <br /> water extraction wells EW 1 .and EW2 to extract contaminated groundwater and assist the- <br /> dual-phase <br /> hedual-phase wells to lower water table level: <br /> Upon approval of the FRP- addendum, AGE will procure permits and schedule field:inspections <br /> with your office 48,hours prior to initiating field activities. <br /> I' <br /> 837 Shaw Road,Stockton,California 95215.' - - <br /> Telephone (209). FAX(209) 4617-1118 - - _ <br />