Laserfiche WebLink
ENVIRONMENTAL HEALTH DEPARTMENT <br /> o►�a '� SAN JOAQUIN COUNTY <br /> Unit Superv;sors <br /> i ?a Donna K.Heran,R.E.H.S. 304 East Weber Avenue,Third Floor Carl Borman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> .': Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. Robert McCtellon,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 ark Barcellos,R.E.H.S. <br /> APR r8 2003 <br /> DOUG STIDHAM KULJIT MANGAT <br /> CITY OF ESCALON 622 CLAY WAY <br /> PO BOX 248 RIPON CA 95366 <br /> zscALON CA 95320 <br /> RE: South County Food & Fuel SITE CODE: 1487 <br /> 1305 Escalon Ave. <br /> Escalon CA 95320 <br /> San Joaquin County Environmental Health Department(SJCIEHD)has reviewed the"Work Plan- <br /> Additional Site Characterization Soil Borings"(Work Plan)dated March 28,2003 that was submitted <br /> on your behalf by Geological Technics Inc. (GTI)and has the following comments. <br /> The Work Plan presents a proposal to install two soil borings to approximately 50 feet below surface <br /> grade to collect confirmation soil samples for analysis. The borings will be advanced in close proximity <br /> to the locations of previous borings HP-1 and HP-5. GTI proposes this work to be completed prior to <br /> continuation of the site remediation by soil vapor extraction (SVE). <br /> In correspondence dated February 18,2003 SJCIEHD requested that you continue the site <br /> remediation, noting that at the time It was shut down the SVE system was still removing approximately <br /> 5-7 pounds of hydrocarbons per day,and that the estimated total amount of petroleum hydrocarbon <br /> contamination removed thus far from the subsurface was less than half of what GTI originally <br /> calculated to be present prior to the start of remediation. In the`Corrective Action Plan, Revised" <br /> dated February 26,2001 GTI estimated the total mass of contamination remaining in the subsurface to <br /> be approximately 1,600 gallons,99%of which was in the soil. Following operation of the SVE system <br /> for approximately 230 days,or 7 '/s months, GTI estimated that approximately 675 gallons of gasoline <br /> had been removed by the SVE system. Based on GTI's calculations,this implies that up to 925 <br /> gallons of gasoline may remain in the subsurface. As stated in the February 18,2003 <br /> correspondence, SJC/EHD considers this to be a significant amount of contamination that,considering <br /> the predominately sandy soil, remains a threat to the groundwater quality at this site. <br /> If you choose to implement the proposal to install confirmation soil borings prior to the completion of <br /> remediation at this site you may do so, but please note that SJC/EHD has previously requested that <br /> active remediation continue with implementation of the CAP as originally proposed and approved, <br /> utilizing all four vapor extraction wells. It is the opinion of SJCIEHD that continued operation of the <br /> SVE system is justified and that it would be prudent to delay installation of the confirmation borings <br /> until final shutdown of the SVE system'is approved by SJCIEHD. <br /> Donna Heran, RENS,Director <br /> Environmental Health Department <br /> Lori Duncan, Senior RENS Nuel C.Henderson,Jr.,RG <br /> LOP/Site Mitigation Unit IV <br /> LOP/Site Mitigation Unit IV <br /> cc: James L.L. Barton, CVRWQCB <br /> Reynold Kablanow, GTI <br />