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4 This email/fax message is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution of this email/fax is prohibited. If you are not the intended recipient, please contact the sender by email/fax and destroy all paper and electronic copies of the original message. From: Robert McClellon [EH] <RMcClellon@sjcehd.com<mailto:RMcClellon@sjcehd.com>> Sent: Wednesday, April 3, 2019 8:19 AM To: Brian W. Millman <bmillman@advgeoenv.com<mailto:bmillman@advgeoenv.com>>; Linda Turkatte [EH] <LTurkatte@sjcehd.com<mailto:LTurkatte@sjcehd.com>>; Palmer, Ann@Waterboards <Ann.Palmer@waterboards.ca.gov<mailto:Ann.Palmer@waterboards.ca.gov>> Cc: 'Dana Parry' <danap@reynoldsandbrown.com<mailto:danap@reynoldsandbrown.com>>; Joe Brusca <jbrusca@bruscaassociates.com<mailto:jbrusca@bruscaassociates.com>>; Robert Marty <rmarty@advgeoenv.com<mailto:rmarty@advgeoenv.com>>; Djuth, Gerald@Waterboards <Gerald.Djuth@waterboards.ca.gov<mailto:Gerald.Djuth@waterboards.ca.gov>>; Roger Ashton (roger@ecs- corp.net<mailto:roger@ecs-corp.net>) <roger@ecs-corp.net<mailto:roger@ecs-corp.net>>; Jesse Easter [EH] <jeaster@sjcehd.com<mailto:jeaster@sjcehd.com>>; Ambrose, Sabra@CalRecycle <Sabra.Ambrose@CalRecycle.ca.gov<mailto:Sabra.Ambrose@CalRecycle.ca.gov>>; Young, Glenn@CalRecycle <Glenn.Young@CalRecycle.ca.gov<mailto:Glenn.Young@CalRecycle.ca.gov>> Subject: RE: Pilkington - 500 E Louise Ave, Lathrop- WU1 excavation and removal: Trenching Plan Brian, I have modified your site map with trench locations. In the previous investigation a n issue that was noted was that the trenches did not determine extent. All of the trenches were located in the area known to have waste and did not extend to area not know to have waste. I have placed a few trenches in areas that will determine extent. Please take a look. One other thing is the pipe line. We will need to see the pipeline. So some of the trenches will need to be close to it so we can determine if there is any waste under the pipeline. Robert Robert McClellon, Program Coordinator REHS San Joaquin County Environmental Health Department 1868 E. Hazelton Ave Stockton, CA 95205 Ph (209) 468-0332 Fax(209) 468-8392 From: Brian W. Millman [mailto:bmillman@advgeoenv.com] Sent: Tuesday, April 02, 2019 7:33 AM To: Robert McClellon [EH]; Linda Turkatte [EH]; Palmer, Ann@Waterboards Cc: 'Dana Parry'; Joe Brusca; Robert Marty; Djuth, Gerald@Waterboards; Roger Ashton (roger@ecs- corp.net<mailto:roger@ecs-corp.net>); Jesse Easter [EH] Subject: RE: Pilkington - 500 E Louise Ave, Lathrop- WU1 excavation and removal: Trenching Plan Hello Robert and Linda, A figure is attached depicting proposed confirmation trenching locations inside the Waste Unit 1 excavation area. Advanced GeoEnvironmental is proposing 15 trenches approximately 45 feet apart to cover the area and confirm wastes have been removed from Waste Unit 1 . The North-South trenches will be approximately 20-25 feet long, the East-West trenches will be approximately 25-30 feet long, and all trenches will be excavated to approximately 6-7 feet below pre- excavation surface grade (approximately 3-5 feet below excavation surface grade). Please don’t hesitate to contact me with any questions or comments.