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U.S. ARMY ENGINEER SACRAMENTO DISTRICT CORPS OF ENGINEERS <br /> DESIGN REVIEW COMMENTS Project: CA ARNG Site Investigations—Stockton AASF <br /> ❑ SITE DEV&GEO ❑ MECHANICAL ❑ SAFETY ❑ SYSTEMS ENG REVIEW Final Work Plan—Former USTs <br /> ❑ ENVIR PROT& UTIL ❑ MFG TECHNOLOGY ❑ ADV TECH ❑ VALUE ENG <br /> C3 ARCHITECTURAL 27 July 2007 <br /> ARCHITECTURAL ❑ ELECTRICAL ❑ ESTIMATING 11 OTHER <br /> ❑ STRUCTURAL ❑ INST&CONTROLS ❑ SPECIFICATIONS NAME Marcus Pierce—RWOCB <br /> DRAWING NO. <br /> ITEM OR REFERENCE COMMENT ACTION <br /> I Page 4, Section This section briefly describes the results of soil sampling during removal of the Text has been revised to state the following: "Sample <br /> 3.1.4 three former 5,000-gallon USTs,but does not provide a figure or table for these locations were reported in the Versar report as"from the <br /> results nor indicate if there was any subsequent investigations or remedial actions bottom of the excavation',however,the depths or <br /> to address the soil contamination detected in soil samples 1 and 4. Did the soil locations were not documented. Also,any subsequent <br /> contamination pose a potential threat to investigations or remedial actions to address the <br /> P P groundwater quality?Add this contamination reported in sample locations 1 and 4 were <br /> information to the Work Plan. not documented(no analytical data table showing results <br /> of these five samples was included in the Versar report) <br /> Without this information,the potential threat to <br /> groundwater quality cannot be estimated. <br /> 3. Page 8, Section This section states"a minimum of two soil samples"will be submitted for Text in Section 6.3 has been revised to clarify and revise <br /> 6.3 analysis per boring,but Table 6-1 and Section 6.7 indicate a maximum of 10 soil the sampling strategy as follows: "A minimum of two soil <br /> samples will be submitted for analysis from the five borings. It will be pointless to samples(one beneath the depths of the former USTs and <br /> advance any of the proposed step-out borings("contingency borings")if the Work one near the bottom the borehole,but above the water <br /> Plan does not allow collection of more than 10 soil samples for analysis. Regional table)and one groundwater grab sample will be submitted <br /> Water Board staff believes the sampling plan should be modified to include for analysis from each boring.However,any number of <br /> contingencies to collect more than 10 total soil samples and more than 2 samples soil samples may be collected from any depth based on <br /> per boring if suspected contamination is encountered at multiple depths. The field observations during borehole drilling(i.e.,soil <br /> Work Plan should also indicate how CA ARNG would select soil samples for discoloration/staining,odors,and PID readings)." <br /> analysis in borings that do not encounter suspected contamination. <br /> The note at the bottom of Table 6-1 has been revised as <br /> follows:"A minimum of two of the collected soil samples <br /> from each boring location will be submitted for analysis <br /> based on field observations and PID readings(one from <br /> beneath the depths of the former USTs and one near the <br /> bottom of the borehole,but above the water table), <br /> however,any number of soil samples may be collected <br /> based on field observations during drilling(soil <br /> discoloration/staining,odors,or PID readings);all <br /> remaining collected soil samples will be submitted and <br /> placed on hold." <br /> CESPK FORM 7 (Revised) PREVIOUS EDITIONS OF THIS FORM ARE OBSOLETE PAGE 3 OF <br /> 15 Apr 89 <br />