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R <br /> ENVIRONMENTAL TECHNOLOGIES CORPORA710N <br /> MT <br /> August 5, 1997 <br /> P90865 <br /> Ms. Lori Shields <br /> Diesel Performance, Inc. <br /> 2804 East Fremont Street <br /> Stockton, California 95208-0387 <br /> Subject: Change Order No. 1 for Additional Work Performed for the Site Investigation at <br /> 2804 East Fremont Street, Stockton, California <br /> Dear Ms. Shields: <br /> On July 23, 1997, Smith Technology Corporation performed a site investigation at the above <br /> referenced site. Ms. Mary Meays of San Joaquin County Public Health Services Environmental <br /> Health Division was present during field activities and requested that additional work be <br /> performed. The additional scope of work which was not provided for in Smith Technology's <br /> original proposal No. P90865, dated May 29, 1997, included advancing additional borings and <br /> submitting additional soil samples for laboratory analysis, and subsequently including the data in <br /> the summary report. The scope of work is described in detail in the following paragraphs. <br /> ADDITIONAL SCOPE OF WORK <br /> Task 1: Soil Boring Installation <br /> Smith Technology proposed to advance three soil borings to depths of 30 feet each employing <br /> direct push technology and collect two soil samples from each boring (six total) for laboratory <br /> analysis. This scope of work was included in Smith Technology's Workplan for Subsurface <br /> Investigation which was approved by PHS/EHD on July 21, 1997. <br /> During actual drilling, field conditions warranted that two additional borings, five total, be <br /> advanced to provide adequate delineation of the site. The three original borings were advanced to <br /> 30 feet below ground surface (bgs) and the two additional borings were advanced to depths of 5 <br /> feet and 45 feet bgs. Ms. Meays was in agreement that the two additional borings were needed. <br /> Task 2: Soil Sample Analysis <br /> Following field activities, a list of the soil samples collected was provided to PHS/EHD per the <br /> July 21, 1997 correspondence. Per verbal communication between PHS/EHD and Smith <br /> W-.* Msal1P90897.doc 1 <br /> 1250 Graphics Drive Modesto,CA 95351-1502 (209)579-2221 Fax(209)579-2225 <br /> Engineering Consulting • Remediation Construction <br />