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Harprit S. Mau [EH] <br /> From: Robert McClellon [EH] <br /> Sent: Thursday, June 25, 2015 8:15 AM <br /> To: Harprit S. Mattu [EH] <br /> Subject: FW: Pilkington Facility, Lathrop, CA <br /> Attachments: PNA-SWIS Lathrop Site Plan -Monitoring Well Location.pdf <br /> Print and place in the file. Robert <br /> From: William Little [mailto:wlittle@advgeoenv.com] <br /> Sent: Tuesday, June 23, 2015 10:59 AM <br /> To: Djuth, Gerald @Waterboa rds; Dana Parry <br /> Cc: Palmer, Ann@Waterboards; Robert McClellon [EH] <br /> Subject: RE: Pilkington Facility, Lathrop, CA <br /> Mr. Djuth and Ms. Palmer: <br /> AGE has reviewed your email recommendations and attached a map for the designated area of <br /> former waste storage, handling or disrupted area, based on older air photos. Additionally, based a <br /> review of the historical JR Simplot— OCC monitoring well network results for groundwater elevation, <br /> gradient maps and dissolved plume dispersion, shallow groundwater flow is east to northeast. <br /> If boring B16 is east or north east of the historical waste area, then this sample is down-gradient to <br /> potential discharge of waste to the groundwater. However, to the request for another down-gradient <br /> shallow groundwater, there is a monitoring well installed at the northern end of the open dirt field <br /> (previously used for irrigation) and northeast of the historical waste area. AGE has noted monitoring <br /> well W-2 on the attached plan with an air photo. AGE recommends samples from this well be <br /> analyzed for chemical of concern to finalize the potential discharge of waste to the groundwater. <br /> AGE agrees the impact to the regional water quality issues from the waste handling are not <br /> apparently significant nor does the current data demonstrate any impairment of the groundwater. <br /> Rather less impact than neighboring investigation (sulfolane) and regional releases (DCA) within a <br /> conceptual site model. <br /> Please contact our office with any questions. AGE will plan to collected and analyze a groundwater <br /> sample to add to the site evaluation. <br /> William Little <br /> California Professional Geologist#7473 <br /> Advanced GeoEnvironmental, Inc. <br /> Environmental • Industrial Hygiene • Geotechnical • Contracting <br /> Phone: 800-511-9300 <br /> Fax: 888-445-8786 <br /> wlittle D—advgeoenv.com <br /> www.advgeoenv.com <br /> This email/fax message is for the sole use of the intended recipient(s) and may contain confidential <br /> and privileged information. Any unauthorized review, use, disclosure or distribution of this email/fax is <br /> prohibited. If you are not the intended recipient, please contact the sender by email/fax and destroy <br /> all paper and electronic copies of the original message. <br /> 1 <br />