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' ®®Z1 iNc <br /> 20 WORKPLAN TECHNICAL APPROACH <br /> ' A review of the area surrounding the Hi Hopes property indicates that only a limited chance <br /> ' exists for any nearby offsite soil and groundwater contamination sources The horizontal <br /> and vertical delineation of soil hydrocarbon contamination at the Hi Hopes property has not <br /> ' been determined at this time Preliminary soil borings indicate the extent of the hydrocarbon <br /> contaminated soil is approximately 2,200 and 3,000 cubic yards and may extend to a depth <br /> ' of approximately 35 feet below ground surface Exhibit 4 depicts the estimated outline of <br /> hydrocarbon contaminated soil at this time <br /> The sequencing of tasks identified in this workplan is designed to comply with the California <br /> ' Regional Water Quality Control Board (CRWQCB) LOFT Assessment and Remediation <br /> Guidelines (CRWQCB, 1989) and the Tri-Regional Board Guidelines for site investigations <br /> ' (CRWQCB, 1991) In addition, the selection and sequencing of tasks has taken into <br /> account the recent and still in-progress changes of policy that the State Water Board has <br /> adopted with respect to hydrocarbon contamination sites that pose a low-threat to <br /> groundwater <br /> 1 <br /> ' TASK 1: SITE BACKGROUND INVESTIGATION <br /> ' Theo ose ur <br /> p p f Task 1- <br /> Site Background Investigation is to obtain the necessary <br /> ' background technical information available for the subject parcel properties that may impact <br /> any site assessment or remediation activities <br /> 1 <br /> The proposed background investigation will follow protocols approved by PHSEHD and the <br /> ' California Regional Water Quality Control Board Tri-Regional Board Guidelines for <br /> investigations (1991) The investigation will include a review of relevant documents <br /> ' regarding the site such as previous spill cleanup, present and former above ground and <br /> ' 08220010 005 5 <br />