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a � <br /> Advanced <br /> co nvironmcnt 1 , Inca JT <br /> 26 October 2007 <br /> AGE-NC Project No. 95-0167 <br /> Mr. Frank Girardi <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: Well Installation and Feasibility Studies Work Plan Addendum <br /> GUARDINO AND CRAWFORD <br /> 517 West Fremont Street, Stockton, California <br /> Dear Mr. Girardi : <br /> At the request of Dave and Pat Guardino of Guardino and Crawford Construction, Advanced <br /> GeoEnvironmental, Inc. has prepared an addendum to the Well Installation and Feasibility Studies <br /> Work Plan, dated 20 April 2007, for environmental remediation feasability pilot studies for 517 <br /> West Fremont Street, Stockton, California. The scope of work included the installation of soil vapor <br /> extraction wells, a ground water extraction well, two observation wells, and a feasibility pilot study <br /> for soil vapor extraction and ground water extraction remediation. <br /> The San Joaquin County Environmental Health Department (EHD) letter dated 26 September 2007, <br /> directed an addendum to the work plan by submitted to their office. As stated in the phone <br /> conversation of 28 September 2007 and two electronic mail items sent to your office, the ground <br /> water feasibility observation wells should be screened through the sand unit at the site ( 15-35 feet), <br /> additionally the EHD has directed the installation of separate, shallow shot screened, soil vapor <br /> extraction observation wells. Additionally AGE has attached the CPT graphical log and Cross <br /> section to support this well screen. The locations of the wells are at borings P5 and P6 located at <br /> 15 feet and 30 feet away from the proposed extraction points. <br /> AGE proposes to install four separate wells for the soil vapor extraction (S V E) pilot test and ground <br /> water feasibility test; screened from a depth of 5 feet to 15 feed for two SVE observation wells and <br /> screened from a depth of 15 feet to 35 feet for two groundwater extraction observat � '( s. Anew <br /> site plan is attached as Figure� 2 06, 4 r, Oti t 1 k2 <br /> i <br /> 407 Slvm R id, Stockton, Celifoniu 95215 <br /> 1'elephonc (209) 4t7-1006 tax ('09 ) 407- 1114 <br />