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! CHECKLIST OF REQUIRED DATA FOR NO FURTHER ACTION REQUESTS AT UNDERGROUND TANK SITES ! H&H Engineering and Construction Facility, 212 Industrial Drive, Stockton, California ! l Distance to production_wells within 2,000 feet of the site Nine wells were identified within 2,000 feet of the site,three of which are the on-site monitoring wells and therefore will not be discussed The closest well to the site is a domestic well located approximately 1,000 feet west-southwest (upgradient) of the ! former UST Five other wells were identified that range from 1,200 feet to 1,800 feet from the site No wells were identified downgradient of the former USTs Based on the location and distance of these wells from the site it does not appear that these wells could be affected by the plume See the Additional ! Subsurface Assessment Sensitive Receptor Survey Report(Klemfelder, Inc , October 16, 2000) for more information on these wells Th erf— 15 o-ne m u ri i c,,pcj W e,1{ a pp,-UX,{ n,day 18W',,a. 2 Site maps Site maps depicting the former UST locations, soil boring locations, monitoring well ! locations, groundwater gradient,buildings and streets are included in Attachment 1 , 3 Cross sections and fi rgu es depicting litholo y Soil boring logs, monitoring well logs and cross sections ! included in Attachment 2 depict the stratigraphy of the site 4 Stockpiled soil No contaminated soil generated from the tank excavation or drilling activities remains on ! site 5 Monitoring wells remaining on site fate Three monitoring wells remain at the site (MW1, MW2, and MW3) It is recommended that these wells be properly destroyed by backfilling with grout to the ground lEt� surface once site closure is granted 6 Tabulated results of groundwater elevations and depths to water A table of groundwater elevation data is ! included in Attachment 3 Depths to water at the site have ranged from approximately 26 89 feet below grade to 38 67 feet below grade ! 7 Tabulated results of all sampling and analyses, including detection limits for confirmation sampling and lead analyses Analytical data for all soil and groundwater] samples are summarized in the tables included in Attachment 3a A� �n��Gc i rr ND ! 8 Concentration contours of contaminants in soil and groundwater Attachment 2 includes cross sections and figures depicting the estimated lateral and vertical extent of soil ! and groundwater contamination 9 Zone of influence for remediation system Not applicable ! 10 Reports/information URF April 3, 1998 ! Subsurface Investigation Reports--Krazan Subsurface Investigation Former Underground Storage Tank Area, February 16, 1998,Additional Subsurface Soil and Groundwater Assessment Phase I, August 28, ! 1998,Additional Subsurface Soil and Groundwater Assessment Phase II,November 17, 1998 !