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Groundwater Investigation Report . Country Club Drain System Project City of Stockton Municipal Utilities Department October 2 2003 Page 5 ' Table 2—Range,Frequency,and Recent Detections of TBA,TAME,and MTBE in Groundwater at Exxon Mobil Site ' Range Frequency Recent TBA TAME MTBE TBA TAME MTBE TBA TAME MTBE Well ID Ng/L Ng/L Pg/L lig/L liglL NPfL ' MW-1 139-221 39 4-16 1 722,600 515 212 26126 601 ND 10 9 MW-4 68 4 0 9-68 4 33-429 1/10 5110 23125 684 36 748 MW-7 16 1-2,370 ND 33-260 6110 0110 2t/23 894 ND 7 6 ' MW-8 696 0 97-69 6 59-151 1/10 3110 24126 69 6 ND 73 1 MW-9 56-484 ND 08-95 5 418 018 13117 484 ND 31 1 VEW-3 I,O50 23,400 16 5 $0 2 1-54,000 4/5 315 718 23,400 16 5 3,150 ' 3 0 FIELD AND ANALYTICAL METHODS I This section includes a description of the site preparation, direct push born, installation procedures, groundwater sampling methods, and laboratory analytical methodologies used during the groundwater Investigation conducted by Condor on September 17 and 24, 2003 I I SITE PREPARATION ' An encroachment permit application was prepared by Condor and submitted to the City of Stockton Department of Public Works A drilling permit application was prepared by Condor and subautted to the '. SJCEHD for the direct push borings Condor received the encroachment and drilling permits prior to initiating any fieldwork (copies of the encroachment and drilling permits are included in Appendix D) The investigation area was marked with white paint and Underground Service Alert (USA) was notified 72 hours in advance of fieldwork to locate and identify underground utilities in and near the work area ' The SJCEHD was notified 48 hours prior to commencement of fieldwork Initial utility location markings made by some of the companies notified by USA were not clearly visible As a result, USA was notified again and the groundwater investigation was subsequently conducted on two separate days ' 3 2 TRAFFIC SAFETY PROCEDURES Condor subcontracted with Hi-Tech Traffic, Inc , a licensed traffic safety company, to provide traffic ' control in the vicinity of the fieldwork Vehicles and equipment working on the shoulders of Country Club Blvd and Plymouth Road were parked facing traffic Traffic control consisted of the following a message board warning traffic of shoulder work located approximately 2,000 feet before the work ' locatton, a diamond-shaped sign warning traffic of road construction approximately 1,000 feet before the work area, traffic cones placed on the road shoulder from approximately 200 feet before the work area to approximately 100 feet behind the work area, and a flagperson with a sign to slow traffic approximately 100 feet before the work area In addition, the flagperson carried a compressed air-operated horn to use as a warning device in the event an oncoming vehicle was dangerously close to equipment parked on the shoulder 3 3 DIRECT PUSH SOIL BORING PROCEDURES A Condor geologist was onsite to supervise the advancement of the borings Prior to commencement of ' fieldwork, a tailgate safety meeting was held and a site-specific Health and Safety Plan was discussed with, and presented to, all field personnel for their signatures CONDOR I