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moi:- s Advanced i GeoEn.vironmental, Inc . 4 05 March 2008 ` MEND AGE-NC Project No. 97-0327. y• F�. MAR .1 1 2008 . {. Ms. Vicki McCartney. ENVIRONMENT HEALTH San Joaquin County Environmental Health Department`= PER ,1M5ERVlCES 600 East Main Street. Stockton, California 95202 Subject: . Revision to Work Plan Addendum-December 2007,dated 05 December 2007 GREWAL'S MARKET 4100 East Fremont Street, Stockton,California ' Dear Ms. McCartney: On behalf of Mr. Rick Grewal of Grewal's Market,Advanced GeoEnvironmental,Inc. (AGE)has prepared this revision to Addendum to Monitor in Well Installation Work Plan -December 2007, dated OS December 2007. The scope of work for the above work plan included installation of one off-site groundwater monitoring well (MW-5) to sixty-five feet below surface grade (bsg) and advancement of three on-site/off-site soil borings(P-15,P-16 and P-17)to depths of ninety-five feet bsg for collection of grab water samples. The location of the site is illustrated on Figure 1. A pian of the site is illustrated on Figure 2. Due.to space limitations in the county right-of-way (Oro Street) and the presence of above-head electrical wiring,AGE is proposing to relocate off-site'soil boring P47 approximately 10 to 20 feet toward the west and onto private property (4010 East Fremont Street). Additionally, AGE is Proposing to relocate monitoring well MW-5 approximately 10 to 20 feet toward the east and onto private property(716 North Oro Street). AGE has already negotiated access agreements with the above referenced property owners. Figure 2 depicts the revised P-17 and MW-5 locations. The above referenced work plan addendum stated that soil borings P-15, P-16 and P-17 would be advanced utilizing a hollow stem auger drill rig, that soil samples would be collected for logging purposes, and that grab water samples would be collected utilizing a hydro-punch water sampling assembly. However, after a cost comparison of,the hollow stem auger drill rig versus a cone penetration testing (CPT) drill rig, AGE has come to the conclusion that it would be more cost effective to utilize a25-ton truckmounted CPT drill rig rather than the above referenced hollow stem drill rig. Utilizing a CPT drill rig to advance borings P-15, P-16 and P-17, soil cuttings would be totally eliminated, and the time spent in the field would should potentially be reduced in half. The above referenced CPT soil borings will utilize a hydraulic ram to advance a cone penetrometer 837 Shaw Road. Stockton,California 95215 Telephone (.209) 467-1006 Fax (209)467-1118 [4 i