ARCHIVED REPORTS XR0000800 - Laserfiche WebLink

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Tune 10, 1998 Page 2 • (MtBE) was reported in two of the six samples at concentrations of 0 19 and 3 6 mg/kg Total lead was not detected in any of the samples analyzed Based on recent groundwater monitoring data from. the California Department of Water Resources (DWR), depth to water is anticipated to be encountered between 13 and 15 feet below ground surface (bgs) Historical depths to groundwater obtained from the DNVR report a historical shallow depth of 6 feet bgs to a deep depth of 33-112 feet bgs PROPOSED SCOPE OF WORK The scope of work proposed for this investigation will include the installation of four groundwater monitoring wells and one continuous core GeoprobeO boring with a discrete water sample to delineate the lateral and vertical extent of hydrocarbons in the soil and groundwater A continuous core will be collected from the Geoprobea boring to investigate geological conditions on site As required by the Occupational Health and Safety Administration(OSHA) Standard "Hazardous Waste-Operations and Emergency Response" guidelines (29 CFR 1910 120), and by California Occupational Ijealth and Safety Administration (Cal-OSHA) "Hazardous Waste Operations and Emergency Response" guidelines (CCR Title 8, Section 5192), PEG will prepare a Site-Specific Health and Safety Plan prior to the commencement of fieldwork The Site-Specific Health and Safety Plan will be . reviewed by the field staff and contractors before beginning field operations at the site The specific scope of work is discussed below O Monitoring Well Installation Four proposed groundwater monitoring wells (MW-1 through MW-4) will be installed at the general locations shown on Figure 2 The proposed wells will be installed 15 feet below the current water level and will be screened from 5 feet above All work will be done in accordance with the permits obtained by the San Joaquin County Department of Environmental Management and the City of Stockton • Geoprobe® Boring. One continuous core GeoprobeO boring (GP-1) will be driven in the general location shown on Figure 2 The boring will extend five feet beyond the historic,groundwater low of 33-1/2 feet to approximately 39 feet bgs A discrete water sample will then be collected Soil Selection and Analysis Soil samples will be collected every five vertical feet to the borings A continuous core sample will be collected from the deep boring to analyze geological conditions on site Selected soil samples will be submitted to a California State- certified laboratory and analyzed for the presence of TPH-g, benzene, • toluene, ethylbenzene, xylenes (BTEX), and MtBE based on odor, discoloration or other anomalous Site conditions furthermore, two selected samples, one From the Geoprobe® boring and one from a o 1 ou, I IkAV111 AN