Laserfiche WebLink
r i • <br /> ['� a ENGINEERING, INC.RCE#27011 Lie./h37901 SEP � �` ��� � � <br /> DDENVIRO �i� —. � <br /> VI <br /> September 9, 2004 PERMNMS RV CEST H <br /> Via Mail and Fax(916) 464-4797 <br /> Mr. Jim Barton <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 11020 Sun Center Drive#200 <br /> Rancho Cordova, California 95670-6114 <br /> SUBJECT: ADDENDUM TO WORKPLAN TO REDEVELOP AND ASSESS WELL <br /> MW-1: FORMER UNOCAL STATION#5098, 5606 PACIFIC AVENUE <br /> & FORMER MONTGOMERY WARDS, 5400 PACIFIC AVENUE, <br /> STOCKTON, CALIFORNIA <br /> Dear Mr. Barton: <br /> This letter is in response to our telephone conversation regarding well MW-1 at the above <br /> referenced site. GHH Engineering, Inc. (GHH) proposes to proceed with the activities described <br /> in the Workplan to Redevelop and Assess Well MW-1, dated September 1, 2004, with the <br /> following exception. <br /> A minimum of ten equivalent well volumes of groundwater will be purged from well MW-1 to <br /> redevelop the well. A groundwater sample will be collected 24 hours after development in <br /> accordance with our sampling protocol. <br /> As we discussed, Mr. Mike Infurna with the San Joaquin County Environmental Health <br /> Department is concerned that groundwater in the vicinity of MW-1 may be impacted as a result of <br /> redevelopment activities. It is our opinion that swabbing the well and proper development <br /> procedures will adequately reduce the potential for impacting groundwater. As you indicated, <br /> Mr. Infurna also suggested that the list of analytes for the proposed groundwater sample include <br /> PAHs and metals. GHH does not agree that PAHs or metals would be associated with the sealing <br /> compound in question, however we will include these compound if directed to do so. Otherwise, <br /> GHH proposes to analyze the groundwater sample for TPH G, TPH MO, and VOCs as described <br /> in the September 1 Workplan. <br /> With your approval, GHH is prepared to proceed with well redevelopment activities on Monday, <br /> September 13, 2004, during other site inspection activities. <br /> 11960 Heritage Oak Place • Suite 2B •Auburn, CA. 95603 (530)886-3100 (800)877-1739 fax: (530)886-3108 <br />