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Advanced <br /> 05 March 2008 <br /> AGE2',"'' "'ro*ect No. 97-0327 <br /> Ms. Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: Revision to Work Plan Addendum-December 2007, dated 05 December 2007 <br /> GREWAL'S MARKET <br /> 4100 East Fremont Street, Stockton, California <br /> Dear Ms. McCartney: <br /> On behalf of Mr. Rick Grewal of Grewal's Market,Advanced GeoEnvironmental, Inc. (AGE)has <br /> prepared this revision to Addendum to Monitoring Well Installation Work Plan -December 2007, <br /> dated 05 December 2007. The scope of work for the above work plan included installation of one <br /> offsite ground water monitoring well (MW-5) to sixty-five feet below surface grade (bsg) and <br /> advancement of three on-site/off-site soil borings(P-15,P-16 and P-17)to depths of ninety-five feet <br /> bsg for collection of grab water samples. The location of the site is illustrated on Figure 1. A plan <br /> of the site is illustrated on Figure 2. <br /> Due to space limitations in the county right-of-way (Oro Street) and the presence of above-head <br /> electrical wiring,AGE is proposing to relocate off-site soil boring P-17 approximately 10 to 20 feet <br /> toward the west and onto private property (4010 East Fremont Street). Additionally, AGE is <br /> proposing to relocate monitoring well MW-5 approximately 10 to 20 feet toward the east and onto <br /> private property (716 North Oro Street). AGE has already negotiated access agreements with the <br /> above referenced property owners. Figure 2 depicts the revised P-17 and MW-5 locations. <br /> The above referenced work plan addendum stated that soil borings P-15, P-16 and P-17 would be <br /> advanced utilizing a hollow stem auger drill rig, that soil samples would be collected for logging <br /> purposes, and that grab water samples would be collected utilizing a hydro-punch water sampling <br /> assembly. However, after a cost comparison of the hollow stem auger drill rig versus a cone <br /> penetration testing (CPT) drill rig, AGE has come to the conclusion that it would be more cost <br /> effective to utilize a 25-ton truck mounted CPT drill rig rather than the above referenced hollow stem <br /> drill rig. Utilizing a CPT drill rig to advance borings P-15, P-16 and P-17, soil cuttings would be <br /> totally eliminated, and the time spent in the field would should potentially be reduced in half. <br /> The above referenced CPT soil borings will utilize a hydraulic ram to advance a cone penetrometer <br /> �3-,, shaw EZ,�zti1_Ztu }_!uif. (_ahfurnia 9,21�_ <br /> 1.Qtvpaon� (2119) 46! €€of, F'ah{209i46'J-II18 <br />