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ENVIRONMENTAL HEALTH DIVISIO1 <br /> 304 E.WeberAve.Third Floor <br /> R O. Box 388,Stockton CA 95201-0388 <br /> Approved (� <br /> Denied ❑ <br /> 0/conditions 5FL <br /> Date by <br /> I,OGf�i� ref U1T <br /> a <br /> �21�11CIN(� VJ>q'(�`TL 9 <br /> WORK PLAN <br /> �jpu 2t� Ski D N <br /> ADDITIONAL SOIL AND GROUNDWATER INVESTIGATION <br /> s„� rn�P- S�M1PrE SURFACE WATER SAMPLING <br /> May 27,I998 <br /> �v �2doD (Of-1 NIGIIip J) • 1.0 INTRODUCTION <br /> 1 (� This work plan is for additional soil and groundwater investigation and surface water sampling at <br /> Hermon & Helen's Marina located at Venice Island Ferry in Stockton. California(Figures I and 2, <br /> W U t 1 lA'i 1"wC.r'I VI4f/ Appendix A). The purpose of the work described is to further investigate the extent of gasoline <br /> contamination associated with former underground storage tanks(USTs)at the site.This work plan was <br /> b—Vu 607,V6./) e,. prepared by Condor Earth Technologies,Inc.(Condor)at the request of Mr.David M.Smith of Herman <br /> &Helen's Marina. <br /> lam/ Jt%r In a telephone conversation on Match 23, 1998.Mr. Ronald Rowe of the San Joaquin County Public <br /> Health Services. Environmental Health Division(PHS/ERD)indicated that based on his review of the <br /> Repan—ddditional.Soff mrd Grouna6water Jnvesagarion,prepared by Condon dated December 11, 1997, <br /> p� he was requesting that quarterly groundwater monitoring continue at the site. Furthermore, he was <br /> I r72 requiring that a work plan be prepared for conducting quarterly surface water sampling and further <br /> )•v.�� investigating the gasoline oxygenate/additive plume to the east of site monitor well MW-2. Condor <br /> IN prepared a letter,dated March 23, 1998,documenting the conversation. This work plan is in direct <br /> /� <br /> / ` response to Mr. Rowe's request and provides a description of the proposed fieldwork and laboratory <br /> C,P 4 l iZ V L�/Z) analyses. <br /> �/ \ 2.0 SITE BACKGROUND <br /> 110i6bDL+S On October 30, 1991, Warren E. Gomes Excavating, Inc., of NO Vista, California, excavated and <br /> ^n,� •/ removed three underground storage tanks(USTs)from the site(Figure 2,Appendix A). The USTs(TKI, <br /> (Aw- l / TK2,and TK3)contained gasoline and diesel fuel. A small hole was found on the lower till end of TK3 <br /> (diesel tank). Petroleum staining and odors were Dated in the soil beneath the former locations of the <br /> W's�� _ USTs- Six soil samples were collected by Condor from the UST excavation at depths of 9 to 12 feet <br /> below the ground surface. Laboratory analyses indicated elevated concentrations of TPH-G,BTEX,and <br /> �/� total extractable petroleum hydrocarbons quantified as diesel(TEPH) in the soil samples. Figure 2, <br /> � f ao•5e Appendix A,indicates the locations of all geoprohe,Hydropunch,and monitor wells installed subsequent <br /> to the UST removal to investigate site soil and gmundwater contamination. <br /> �VtPV��W/ �NI, SMrla�/ On August 22. 1995,three hydropunch borings were drilled at the site. Gasoline odors were noted in <br /> each borehole. Laboratory analyses indicated concentrations of TPH-G and BTEX in the soil and <br /> 40QVF-A`i groundwater samples analyzed from each borehole. Based on the results of the August 1995, <br /> v investigation,Condor recommended additional investigation be conducted to evaluate the extent of the <br /> hydrocarbon plume. On August 29.1996,five Geoprobe boreholes were installed at the site. The results <br /> O( yyt�,t_� g, P•- of the laboratory analyses indicated that elevated concentrations of TPH-G.BTEX,and methyl tertiary <br /> Y 111 V �r butyl ether(MTBE)were detected in soil and gmunclumer samples at the north portion of the site and <br /> �y� that further investigation was necessary to evaluate the extent of soil and groundwater contamination. <br /> I(IV t✓ l 1 Rv <br /> �iZl'�INYKI� �IfZkt ��?� r: <br /> (Lv ) Conaax <br /> � vbmir �vR_�j"14) <br /> TD elf <br /> 6s �4P�Ivpt�ov �)fl t5 �ASfIP). caP�l <br />