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r \I <br /> Advanced <br /> GeoEnvironmental, Inc . <br /> 15 June 2004 <br /> AGE-NC Project No. 97-0249 <br /> Mr. Mike Infiirna <br /> JUN 2 1 2004 <br /> San Joaquin County Environmental Health Department ENVIRONMENT HEALTH <br /> 304 East Weber Avenue, 3''Floor PERMIT/SERVICES <br /> Stockton, California 95202 <br /> Subject: Recommendation to Abandon Domestic Water Well (DW-1) <br /> THREE B'S TRUCK PLAZA <br /> 14749 Thornton Road, Lodi, California <br /> Dear Mr. Infurna: <br /> At the request of Mr.Andy Zarakani of D.I.K.Tracy Enterprises Inc.,Advanced GeoEnvironmental, <br /> Inc. (AGE) has prepared this recommendation for the abandonment of the domestic water well <br /> (DW-1)located at 14749 Thornton Road,Lodi,California(site).The location of the site is illustrated <br /> on Figure 1; a plan of the site is illustrated on Figure 2. <br /> Previously, a down-hole video camera probe was conducted at DW-1 by Water Well Technology <br /> Inc.on 06 November 2001.The results of the down-hole video probe revealed that the well consisted <br /> of 10-inch diameter,PVC blank well casing from surface grade to a depth of 83 feet below surface <br /> grade(bsg);there were no apparent areas of perforations visible during the down-hole video probe. <br /> Between 83 feet and 99 feet bsg, the well appeared to be an open-bottom type well (i.e. no well <br /> casing, open borehole). <br /> To monitor for petroleum-impacted ground water at DW-1, `grab'water samples have been collected <br /> on a quarterly basis since April 1999. Since April 1999,no petroleum constituents of concern have <br /> been detected from DW-1.However,four ground water monitoring wells(MW-6,MW-9A,MW-9B <br /> and MW-9C) located less than 25 feet from DW-1 have consistently been impacted with either <br /> gasoline (TPH-g), benzene or methyl-tert-butyl-ether (MTBE). Analytical results from MW-6, <br /> MW-9A,MW-9B and MW-9C are summarized in Table 1. Well MW-6 is screened between 5 and <br /> 25 feet bsg, MW-9A is screened between 40 and 45 feet bsg, MW-9B is screened between 70 and <br /> 75 feet bsg and MW-9C is screened between 95 and 100 feet bsg. <br /> Furthermore,it appears that ground water pumping at DW-1 may be drawing the dissolved portion <br /> of the Three B's Truck Plaza plume towards it. Based on a ground water elevation maps of <br /> Hydrologic Unit 2(between 35 and 60 feet)on 15 March 2004, and of Hydrologic Unit 4(between <br /> 837 Shaw Road,Stockton,California 95215 <br /> Telephone(209)467-1006 FAX(209)467-1118 <br />