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17 March 2015 <br /> AGE Project No . 06- 1457 <br /> Page 3 of 3 <br /> locations , ( Figure 3) a second boring will be advanced approximately 5 to 10 feet from <br /> the initial boring locations and soil sampling will resume at the previously terminated <br /> depth . <br /> Field observations and analytical data collected during this proposed phase of <br /> A <br /> nvestigation will be used to develop additional cross-sections and update the site <br /> conceptual model . <br /> EHD Comment #3 : Specify that shallower zone monitoring wells will be installed if <br /> field indications of contamination is encountered and complete the proposed <br /> deeper wells in a separate boring . <br /> See AGE response in comment 2 above . <br /> EHD Comment #4 : Describe the decision criteria for selecting the final screen <br /> interval for each of the wells based on field observations . <br /> For shallow wells , it is anticipated that screens will be installed from 30 to 50 feet bsg , <br /> while intermediate level wells have been previously proposed at depths of 75 to 80 feet <br /> bsg . All well screening intervals will be constructed at depths where coarse-grained , <br /> saturated soils have been encountered (i . e . sands , silty sands or gravels) . Wells will <br /> only be constructed after EHD staff, a California Professional Geologist, and AGE field <br /> staff has concurrently reviewed field data . <br /> If you have any questions regarding this addendum or require further information , <br /> please contact our office at (209) 467- 1006 . <br /> Sincerely , _ <br /> NPL GFO <br /> EyS� Cp <br /> eoF ,�PM R . 7jTcisf <br /> Advanced GeoEnviron mental , Inc . c y r <br /> �F <br /> No. 7473 <br /> Daniel Villanueva William R. Little sT <br /> Project Geologist Senior Project Geologist <br /> Professional <br /> Of GNI °Q <br /> Professional Geologist No . 7473 <br /> Cc : Mr. Jim Barton , Central Valley Regional Water Quality Control Board <br /> Mr. Mohamad Matar, Property Owner <br /> Arlvmeced Geolinvironmcntal, Inc. <br />