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SIERRA-PACIFIC GROUP <br /> Geologists+Engineers s Scientists+Compliance Specialists <br /> July 9,2001 <br /> Amy Terrell 01 JUZ 10 <br /> A"110: 48 <br /> California Regional Water Quality Control Board <br /> 3443 Routier Road, Suite A <br /> Sacramento, California 95827-3098 <br /> Subject: Analytical Test Results From A Soil Sample Collected at Soil Boring MW-18,Former PureGro <br /> Facility, 1905 North Broadway Avenue, Stockton, California: Sierra-Pacific Project No. 94- <br /> 055.02 <br /> Dear Ms. Terrell: <br /> On May 30,2001,while advancing an 8.25-inch hollow-stem auger soil boring in the southwest corner of the Western <br /> Farm Service facility at 1905 North Broadway Avenue, Stockton, Sierra-Pacific Group (Sierra-Pacific) observed <br /> reddish-brown stains within a few feet of the surface. Uncertain as to the nature and composition of the reddish- <br /> brown substance, Sierra-Pacific stopped the drilling, and grouted the open hole with neat cement. The boring was <br /> terminated at about 45 feet below ground surface(bgs), above the capillary fringe. <br /> On 31 May 2001, Sierra-Pacific submitted a sample of the red-stained soil from MW-18 to Sequoia Analytical <br /> (Sequoia) for chemical analysis on a 48-hour turn-around. We subsequently informed you and Michael Infurna of <br /> San Joaquin County of the situation. The MW-18 soil sample was tested for agricultural fumigants (DBCP and <br /> EDB), volatile petroleum hydrocarbons, and Title 22 metals. <br /> Sierra-Pacific received the analytical test results from Sequoia on 15 June 2001. No DBCP, EDB, or volatile <br /> hydrocarbons were detected in the soil sample. Title 22 metals were within acceptable limits. I called you regarding <br /> the results of the testing and rescheduled the drilling. Nested monitoring wells MW-18A/B were subsequently <br /> installed on 25 June 2001. The new wells were developed on 29 June 2001. The laboratory test results are enclosed. <br /> Please call if you have any questions. <br /> Sincerely, <br /> SIERRA-PACIFIC GROUP <br /> hn ep on Ra D, C.E.G. 1133 <br /> Senior Engineering Geologist <br /> JSR/dk <br /> c: Michael Infurna, San Joaquin County <br /> W.T.Nickerson,Unocal <br /> Enclosures <br /> 4911 Windplay Drive,Suite 4 <br /> El Dorado Hills,CA 95762 E-Mail:mail@www.siema-pacifiegroup.com Phone:(916)933-1468 <br /> Fax:(916)933-3197 <br />