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- KAM <br /> `�` .m .a. F ms` s "a`h `�.�3k•ys� i ,.,a-. „-f.�s ""`3��''�L,' "Y�' <br /> Northern California Regional Office 41674 Christy Street.Fremoni.nA 94538-3114 (415)659.0404 Fax:{415)651.4677 Lic.R 59£545 <br /> March 27, 1991 <br /> MUNCH <br /> San Joaquin County <br /> Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 <br /> Stockton,CA 95201 <br /> Attention: Mr.Steven K.Schneider <br /> Environmental Health Specialist <br /> Subject: Addendum to Work Plan for Supplemental Soil and Groundwater Investigation <br /> GASCO Gasoline Station,749 East Charter Way,Stockton,California <br /> Exceltech Project No.3-30054-31 <br /> Czar Mr.Schneider. <br /> Exceltech, Inc., is submitting this addendum changing the above referenced work plan as <br /> discussed in our phone conversation of March 25, 1991. During the conversation, three <br /> modifications(1 addition and 2 changes)were discussed as detailed below. <br /> I. 1LQa= <br /> During the drilling operations,care will be taken to note occurrences at clay layers which <br /> may represent aquitards. If such la!rers are encountered, the Environmental Health <br /> Division(EHD)of the San Joaquin County,Public Health Services will be contacted prior <br /> to installation of the groundwater monitoring well. <br /> 2. w ri W lln ncno S§,r, : <br /> The screened interval will not exceed 20 feet in length and will extend from 45 feet <br /> (currently installed wells which extend to 50 feet are now dry, EHD requests a 5-foot <br /> overlap between existing wells and proposed wells) to approximately 65 feet. If <br /> groundwater is not encountered at this depth or if in the opinion of the on-site Exceltech <br /> geologist,sufficient penetration of the aquifer has not occurred,the EHD will be contacted <br /> prior to continuing the boring beyond 65 feet. <br /> 3. Cilar <br /> IgetoCjrmundw ni' cin W ll n ' n c i : <br /> Approximately 3 feet of bentonite pellets will be placed on top of the sand pack and <br /> hydrated to act as a seal. <br /> e trust that <br /> modifications tavenclosed <br /> a .cation for <br /> Permit anda chvk amount of$89.00 ifyou he any questions,fel free to call. <br /> Sincerely, <br /> Exceltech,Irx. <br /> Richard A.Garlow,R.E.A. 1365 Lawrence D.Pavlak,C.E.G. 1187 <br /> Project Manager Senior Program Manager <br /> RAGA DP/da <br /> Enclosure <br /> Recydabie and mads imm recycled parer. <br />