Laserfiche WebLink
45r- <br /> �Q <br /> SITE cONTAMINATION WORKPLAN JAN 2 31992 <br /> AND <br /> BOIL REXEDIATION PIAN ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> INTRODUCTION <br /> pG&E plans to remove a 2 , 000 gallon underground diesel tank <br /> on or around (Date) . This SCW/SRP has been prepared as a <br /> contingency plan in the event low levels of petroleum range <br /> hydrocarbons are encountered in the soil two feet bolow the <br /> tank. This contingency plan establishes procedures for <br /> evaluating and disposing of affected soils in order to <br /> remediate the site in a timely and cost effective manner. <br /> BITE HISTORY <br /> on October 16, 1991, a 12 , 000 and two 5, 040 gallon unloaded <br /> fuel tanks were removed. soil samples were obtained in <br /> a.ccordances with all the San Joaquin County Dnvironvental <br /> Health Department guidelines. Due to the low lsvcls of <br /> petroleum range hydrocarbons present in the initial seTP .es a <br /> SCW and a PAR were developed by Dames and Moore , Tie SCW and <br /> the PAR were approved by the County and the existing <br /> excavation was further excavated by five feet. Contirm"tion <br /> samples were taken and the results were negative. ~'^^ <br /> excavation was then back filled with clean fill ar3 ved. <br /> The new tanks were installed adjacent to the orig ' n�l <br /> excavation. <br /> The 2, 000 gallon diesel tank that will now be rer,3ved sae <br /> been in operation for over 20 years and has ..v <br /> major problems to date. The results of the laat .nua: <br /> precision test (performed on February 2 , 1991, see <br /> attached copy) were acceptable. The tank is ccnt{nually <br /> monitored by a TLS-250 system. Groundwater is estimated at <br /> 60 feet. <br /> PURPOSE AND SCOPE OF WORK <br /> The purpose of this investigation will be to anzlyzn and <br /> evaluate subsurface so-' lA nor range hydrocarbons in <br /> accordance with tht: criter_� specified in the Regional Board <br /> 5tdf.L- Recomnendations for an In_L.ia Evaluation and <br /> Tnveetiqdtien of Tanks , Appand ,x A, Tri-Regional <br /> Recommendations . As steitad Tara.ier, this report is a <br /> contingency plan in the: event t:iat there are cLvious signs of <br /> hydrocarbon conr.tituent� in the so_l two feet be?ow the tank . <br /> If this condition exists , We prcpoSe, in acccrdancc with the <br /> iri-Regional to acidr'ess the areas of concern <br /> by performing a "scoop ural -un" cleanup. Tn eseePce, to <br /> further excavate the pit by fil.' , feet and take ccnfirmation <br /> samples below the two initial samples required by the Tri- <br />