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T T Mr. Wrlam &ottaln Mr. Willem t4atmin August 25, 2m0 August 25. 2020 Pages Page Cl e surface pad will be removed using ajackha_er, and the well seal materials and well will be Please don't hesimte to contact either of the undersigned with any questions at (925) 270-4674 or via ken apart and removed using compressed air and hand tools. As materials are removed from email at:carroURtnhvdro.com andeleormnnihvdro.c well, a Trihydro geologist w1frecord field obser05Yo�ding the well condition and CS classification of any formation soils encounter Sincerely, • Once well materials of APSV-9 and APSV-10 are removed die location will be abandoned in �dm Corporation accordance widi San Joaquin County Department of Environmental Health smadards, including placement ofgrout/neat cement within the abandoned borehole under the supervision/direction of a San Joaquin County inspector. Carroll, P.G. lenn M. Leong r� \• The proposed replacement location will be at away from the low noin[ in the roadway to Geologist �o`�w0'++ q SeniorP ject Manager L minimize potential traffic snd standing water i iprccis.'17115'SnaMocatiov will be determined in the field but will be within ten feel of the fom APSV-9/10location. 42X-001-005 aamr The proposed well design consists of one &inch ng soil vapor probe set at the bottom of the hments borehole (approximately 9 ft bp;) (APSV-9R). A nd soil vapor probe will be set at a Attac f`"rarrt.e� shallower depth (approximately 5 ft bgs) (APSV-10R Both probes will be attached to '/.-inch Teflon tubing leading to the surface (extra tubing length 'll be kept at the surface to facilitate sample collection. A send filter pack consisting of AS sand will be placed around the probe. A seal consisting ofbentonite will be placed between the wells and a seal ofbentonile and neat cement will be placed above the shallow well to the surface (to reduce the potential for surface watch infilunfion into the well). After installation, a vacuum will be induced on each well to verify the integrity of the transition and sanitary seals. A new well pad and well vault will be installed with a raised elevation to reduce impacts on the well from surface water flow. • Containerize and sample all waste generated during the project in 55-gallon drums and store at the compound at 666 West Weber Avenue until samples can be analyzed by a California-certified laboratory for waste characterization and off-site disposal is coordinated Upon approval of this work plan. Trihydro will begin contacting the San Joaquin Deparuncat of -- Environmental Health for the well permit and Delta View Apartments property management for site REPORTING AND FUTURE SAMPLING SCHEDULE An installation summary report will be submitted to the CVRWQCB following completion of the well replacement activities. Following completion of the well installation activities, soil vapor samples will be collected from the replacement well APSV-9/10 on the same semiannual schedule indicated in the Request forRtmislon to Soil VaporMonitoring Pmgrmn submitted to the CVRWQCB on August 29, 2017 and approved by the CVRWQCB in a letter dated October 9, 2017. Results of the soil vapor sampling will be presented in the semiannual groundwater monitoring reports submitted to the CVRWQCB on August I and February 1 of each year.