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�X <br /> 09 November 2009 <br /> AGE-NC Project No. 96-0236 <br /> Mr. Mike Infurna <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202 <br /> Subject: Revision to Work Plan Addendum, dated 29 December 2008 <br /> BOULEVARD AUTOMOTIVE SERVICE <br /> 2151 Country Club Boulevard, Stockton, California <br /> Dcar Mr. Infurna: <br /> On behalf of Mr. Roger Hartley of Country Club Blvd. LLC, .Adiwnced GcoEnvironmental, Inc. <br /> (AGE) has prepared this revision to Work flan Addendum, dated 29 December 2008. The scope of <br /> work included the advancement of four(4) off-site Geoprobe soil borings (P-17 through P-20) to <br /> depths of approximately 50 feet below surface grade (bsg) and collection of grab water samples. <br /> AGI; had informally identified sandy hydrogeologic units at depths between 35 and 50 feet bsg as <br /> I-lydrogeologic Unit 2, and at depths between 70 and 85 feet bsg as Hydrogeologic Unit 4. The <br /> location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. Laboratory <br /> analysis of previous grab water samples and ground water monitoring well samples are summarized <br /> in Tables 1 and 2, respectively. <br /> Based on letters dated 23 March 2009 and 08 October 2009 (Appendix A), the San Joaquin County <br /> Environmental Health Department (EFID) stated that off-site ground water was not adequately <br /> assessed at depths greater than 50 feet bsg, and further directed that ground water samples be <br /> collected from proposed borings P-17 through P-20 at depths oleapproximately 75-80 feet bsg(i.e. <br /> Hydrogcologic Unit 4). Therefore, in accordance with the above EHD directive, AGE is proposing <br /> to revise the total depth;of borings P-17 through P-20 to depths of approximately 75 feet bsg. Grab <br /> water samples will be collected at each boring location from Hydrogeologic Units 2 and 4. <br /> Additionally, because of the prevailing northwest gradient observed from the site's wells screened <br /> within Hydrogeologic Unit 2, AGE is proposing to advance one additional boringlocationP-21 <br /> further down gradient to ensure the lateral definition of the deeper dissolved plume. Soil boring P-21 <br /> is located approximately 125 feet west-southwest of boring P-20(see Figure 2).Grab water samples <br /> would be collected at P-21 from Hydrogeologic Units 2 and 4. <br /> AGE had previously proposed utilizing a van-mounted Geoprobe 5400 direct-push probing unit <br />