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Rim% a <br /> 6 E' T T LL.E R : . , <br /> 4j PJ '{ • , J tis ' t <br /> ' -•WORK PLAN FOR ADDITIONAL SUB'SU'RFACE,ASSESSMENT <br /> ` b. .Former Unocal Station No.2859 s k' <br /> .. 1665 Pacific Avenue i <br /> '✓-Stockton;California �{ <br /> Report No, 240072 04 1 <br /> INTRODUCTION _ <br /> ` - '"' •4 gin.. .,-. -,.•-. ". - r -.. ' _� '., .. yY •' <br /> At the request.of Unocal Corporation (Unocal);'"Gettler Ryan{Tnc. (GR) has-prepared this' <br /> his Work Plan for. <br /> ' additional subsurface assessme_neat the subject site.-The puipose.of this.investigation is to'`delineate the ' <br /> horizontal and vertical extent of petroleum .,site. <br /> in-the'soil'and,groundwafer in the immediate` F <br /> vicinity.'of the `subject site, and analyze tl e:,feasibility'of,a,vapor"extraction1.'as a remedial option at this .: <br /> site. This work was requested:by'San Joaquin:County.'.LThe proposed subsurface-assessment includes: <br /> obtaining the required monitoring well and encroachment permits; installing nine groundwaier..monitonng-. ' <br /> wells, collecting selected 'soil samples from" he'wel.l borings;developing and sampling the groundwater <br /> monitoring wells;'analyzing selected soil and'groundwater•samples;":surveying the'newly installed wells; <br /> conducting a vapor extraction-piloflest; arranging for Unocal's'contractor,-to.dispose of'waste material;, ` <br /> and'preparing a report presenting-the findings.of the investigation: <br /> ( Jt : <br /> The scope`of work described in' ihis-'Work PIah is intended to comply with the State-of California Water`' <br /> Resources Control Board's" Leaking "Uridergroand Fuel `.Tanks '(LUFI) 'Y Manual and``California <br /> Underground Storage Tank.Regulations,:1994,'the California'Regional Water. Quality ,Control Board; <br /> CRW CB Tri-Re tonal Board Staff Recommendations or Prelimin Investigation:and Evaluation'Of <br /> ' <br /> !' Underground_Tank Sites, and San Joaquin County Public Health Services:(SJCPHS)guidelines..' <br /> . SITE'DESCRIPTION <br /> The subject site is a vacantlot situated on the southwest corner of Pacific-Avenue and VJaInut Avenue m ; <br /> s Stockton, California (Figure 1). .-Former facilities at the�;site.consisted of.a station building; one 550 T. <br /> allon waste oil undergroundrstora a tank.(UST), two dis enser.islands '.and'.two:10,000 gallon asoline <br /> USTs that shared'a common pit near,the center?of the site;- L6cat1ons'ofpertinent'site features are shown } <br /> on Figure 2. <br /> PREVIOUS ENVIRONMENTAL WORK <br /> Kleinfelder, Inc.ydrilled soil'borings CB-1"-:through KB-5 m January:1988 These borings were drilled. <br /> around the tank complex,.adjacent•to the product islands,:and adjacent to the waste`oil tank: The highest, <br /> Total`Petroleum;Hydrocarbons as.,gasoline'":(TPHg) were detected -in borings KB3 and" KB-5 at ` <br /> • 2'S 551 :7555' <br /> i{f rn'ia 94568 9 : <br /> 674"7 .Sierra. Gou.rt Sul"te "J,'h. D'u•b'lin ,•".'Ga1, o ( ) <br /> � <br /> • h <br />