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LEARN TE kstrqp �t <br /> :` i 1IFi_Jf't <br /> G_ R O U P, I N C. niz <br /> 4h.11 '24 <br /> Mr.,Ron Rowe November 1, 1995 <br /> San Joaquin County Public Health Services <br /> Environmental` Health' .Division <br /> P.O. Box 399 <br /> Stockton, California. 95201-M88 <br /> Re: Water Levels. Soil Disposal' QuarterlyMonitoring at City of Ripon <br /> Corporation Yaid;.Ripon;CA <br /> Dear.Ron,. <br /> Clearwater Group, Inc. (Clearwater) has bee iinvolved in-site assessment <br /> Activities at the subject location since january 1995. Three monitoring wells <br /> were installed_at the'site, and quarterly monitoring was,conducted_for the first" <br /> .and second quarters of 1995. On October 4 1995; a Workplan for'�.Additional <br /> Site Assessment was submitted for your approval. ' <br /> With the submittal of this letter; Clearwater requests your approval of the. <br /> following: . <br /> Onsite disposal of soil generated during the drilling of the three <br /> monitoring' wells <br /> Suspension .of further evaluation of the roundwater gradient until <br /> additional.monitoring points'have been installed <br /> . Submittal of groundwater analytical data collected on October 18 to satisfy. <br /> third.quarter 'monitoring,requirements. <br /> oil Disposal <br /> On February 23, 1995,Clearwater installed ree 2-inch= ri <br /> diameter monitong <br /> wells.to depth of 30-feet below ground surfac (bgs). Two soil samples were <br /> collected from'each boring.and-analyzed for hydrocarbons (see attached'.table). <br /> Analytical results indicate that concentration s,of'total petroleum <br /> hydrocarbons (TPH) as gasoline and diesel:ftel were below the,detection limit <br /> of`10 parts per million (ppm). Benzene; toluene, and ethylbenzene <br /> 1125 Atlantic Aveitiue•.Suite 102•Alameda'C_—fomia'. .94501 • (510)337,8730•Fax(510)'523-0984 <br />